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Business case for performance management software: a CFO-ready template

A business case template HR leaders can paste into a budget request: a problem statement built from your own review hours, manager time and turnover figures, the cost of the status quo against the cost of software, outcomes finance can check, risks and mitigations, a 30/60/90-day rollout and a one-slide summary.

By the CLEAR Talent team

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Choosing performance management software is usually the easy part. Getting it funded is harder, because the person who signs the budget was not in the demos and will judge the request on different terms: what the current process costs, what changes if the money is spent, how anyone will know, and what could go wrong.

This page is built for that conversation. Each section below covers one part of a business case, with the figures to collect and how to calculate them from records you already hold. The template turns those figures into a one-page case and a cost table you can download as a spreadsheet, and the one-slide summary condenses it for the meeting itself. Nothing here relies on industry averages or a vendor’s promised savings — finance will ask where every number came from, so every number starts from your own last review cycle.

Section 1

Write the problem statement with your own numbers

A problem statement that says “our review process is inefficient” gets a polite nod. One that says “last year’s two review cycles took our managers 630 hours and our HR team 160 hours, finished three weeks late, and moved eleven ratings in calibration with no recorded reason” gets a budget discussion. The difference is measurement, and the measurements come from your last cycle rather than from a benchmark.

Collect the figures below before writing anything. Estimates are fine as long as you say how you made them: a show of hands at a managers’ meeting is an estimate, and finance would rather see an honest one than a precise-looking figure with no source.

The metrics a performance management business case needs, how to calculate them and where to find them
MetricHow to calculate itWhere the number comes from
Manager hours per review cycleReviews written × hours per review, including reading last year’s form, gathering evidence and the conversation itself. Multiply by the number of cycles a year.Ask five or six managers how long their last reviews took. Use the middle of the range, not the fastest manager.
Employee self-assessment hoursEmployees reviewed × hours spent on the self-assessment, per cycle.A one-question pulse after the cycle closes, or the same show of hands.
HR administration hoursHours spent building forms, sending reminders, chasing late submissions, consolidating ratings, preparing calibration packs and producing reports, per cycle.The HR team’s own diary or timesheets for the last cycle. This is usually the best-evidenced line in the case.
Loaded hourly costAverage salary plus employer costs, divided by working hours a year. Use one rate for managers and one for HR.Finance. Using their rate rather than your own removes the first objection before it is raised.
Completion against the deadlineReviews signed off by the deadline ÷ reviews due, and how many days late the cycle actually closed.The tracker or HRIS records for the last cycle.
Voluntary turnover and replacement costRegretted leavers in the last year whose exit interviews cite unclear expectations, no feedback or no development path, × the cost per hire finance already uses.Exit interview notes and finance’s or recruitment’s cost-per-hire figure. If neither exists, describe the exposure in words and leave it out of the totals.
Disputes and data requestsRating appeals, grievances that cited a review, and subject access requests that included performance records — with the hours each took to answer.The HR case log. Even a small number matters here, because each one shows whether the record could be found and defended.

Keep each metric’s source next to it in the template. A business case that shows its working survives the finance meeting; one that does not is sent back for it.

How to work out a platform’s three-year cost per employee

Section 2

Cost of the status quo vs the cost of software

The status quo is never free. A spreadsheet or an HRIS form has no licence fee, but it has a running cost in manager and HR time, and a risk cost in decisions that cannot be explained afterwards. The software has a licence fee, a one-off setup cost and your own people’s time to configure and launch it. Put both sides in the same table, over the same period, and let the difference speak.

Price both sides over three years rather than one. Setup costs land in year one, so a one-year view understates the case for any option with a setup cost and flatters doing nothing.

Cost lines for the status quo and for performance management software, and how to put a number on each
Cost lineStatus quo (spreadsheet or HRIS form)With performance management softwareHow to put a number on it
LicenceNone, or a module already bundled into the HRIS.The subscription at the headcount you expect in year two. CLEAR Talent publishes its plans: Basic is USD 39 a month for 1 admin user and 10 staff users, Pro is USD 295 a month for 3 admin users and 50 staff users, with published rates for additional users, and Enterprise is quoted. Annual billing saves 15%.The vendor’s price list or written quote, using the vendor’s own definition of a billable user.
Manager timeWriting each review from scratch, re-finding the year’s goals and feedback, and redoing forms returned incomplete.Lower where goal scores, competency ratings and feedback already sit in the system and reach the review without re-keying. How much lower is your estimate to test in a pilot.Hours per review today, and the hours you expect afterwards, × reviews × cycles × the loaded manager rate.
HR administrationChasing by email, merging late forms, rebuilding the workbook for each cycle and assembling calibration packs by hand.Stage deadlines with automated reminders, roll-up scoring and reports generated from the cycle.HR hours per cycle today, and the estimate afterwards, × the loaded HR rate.
SetupNothing new, but the workbook is rebuilt every cycle.A one-off cost in year one. For CLEAR Talent, setup fees are quoted depending on the package; add your own configuration, data-cleaning and training hours.The vendor’s written implementation scope, plus internal hours × the relevant rate. Count it once, in year one.
Decisions that cannot be explainedRatings that changed in calibration with no recorded reason, and pay or promotion decisions resting on them.A logged record of every rating change, with who, what and when, and calibration inside the cycle.Rarely a number. Describe the exposure — appeals, grievances, pay transparency requests — and the hours the last one took.
Turnover exposureRegretted leavers who cite unclear expectations or no development conversation.Unproven until you measure it. Development plans that follow from each review are the mechanism, not a guarantee.Show it as exposure, not as a saving: leavers × replacement cost, kept out of the net figure.

CLEAR Talent figures are the published list prices on the pricing page; Enterprise is quoted. Price other vendors the same way, from their own price lists or written quotes.

Compare list-price context at your headcount in the comparison calculator

Section 3

Expected outcomes finance can check

An outcome belongs in the business case only if someone could check it a year later. “Better performance conversations” cannot be checked; “every review signed off by the deadline, against 70% last year” can. Write each outcome as a baseline from your last cycle, a target and a date, and set the targets yourself — a vendor’s figure for what other customers achieved is not evidence about your organisation.

Separate what you are committing to from what you hope will follow. Finance will respect a case that banks only the time savings and describes the rest honestly far more than one that promises lower turnover.

Outcomes to commit to

  • Reviews completed on time

    The share of reviews signed off by the deadline, and the number of days the cycle runs late.

  • Time per review

    Manager and HR hours per cycle, measured the same way as the baseline.

  • Ratings with a recorded reason

    Every rating changed in calibration carries a reason that can be shown to the employee or a tribunal.

  • Development plans agreed

    The share of reviews that end in a development plan with an owner and a date.

Outcomes to describe, not bank

  • Regretted turnover

    Track it, and the reasons in exit interviews, but keep it out of the net figure: too much else moves it.

  • Manager capability

    Upward feedback and calibration notes will show whether reviews are getting better. Report it; do not price it.

  • Goal alignment

    How many individual goals link to a company objective. Useful evidence of focus, hard to turn into money.

Agree in the case who will report the outcomes, and when. A review of the first cycle at day 90 and of the full year at month twelve gives finance two points at which to check that the money was well spent.

Section 4

Risks and mitigations: GDPR, adoption and the rest

Naming the risks yourself is what makes the rest of the case believable. Finance, IT and your data protection officer will raise most of these anyway; a case that answers them in advance moves faster. The mitigations below describe what to check with any vendor, and where CLEAR Talent is named, what it publishes.

The main risks of adopting performance management software and how to mitigate them
RiskWhat it looks likeMitigation
GDPR and employee dataRatings and review comments are personal data. A new processor needs a data processing agreement, a lawful basis, controlled access and a way to answer subject access requests.Involve your DPO before the contract, not after. Ask for the DPA and subprocessor list, where the data is hosted and how subject access and erasure work. CLEAR Talent provides subject access request exports, right-to-be-forgotten workflows, role-based access and a DPA; it is hosted on Google Cloud Platform, with regional requirements agreed for each deployment.
Manager adoptionManagers keep their own spreadsheets, submit late or treat the system as one more form to fill in.Pilot with a few managers before launch and use their questions in the launch message. Keep the first form no longer than the one it replaces. Stage deadlines with automated reminders do the chasing; on plans that include the iOS and Android apps, push notifications reach managers away from a desk.
Data migration and HRIS fitReporting lines are out of date, history arrives in the wrong shape, or the case assumes a connector that does not exist.Clean reporting lines from the HRIS before import and bring across only current goals and the last cycle’s ratings. CLEAR Talent sits beside your HRIS: data comes in through CSV or Excel bulk import or the API, and there is no prebuilt connector to a named HRIS.
AI-generated contentDrafted review text that nobody checks, or employee data used in ways the works council or DPO has not agreed.Agree where AI may draft and who approves it. In CLEAR Talent every Ava output is labelled, editable and approved by a person, AI can be switched off per cycle, team or module, and your employees’ data is never used to train models for other customers.
Cost growthThe subscription steps up as headcount grows, or modules needed later sit on a different plan.Price the case at the headcount you expect in year two and at one meaningfully below it. Name the modules you will need by plan, and ask for renewal terms with the first-year price.
Lock-inYears of review history held in a system that is hard to leave.Confirm the export before you sign. CLEAR Talent exports records and reports as CSV, Excel or PDF on every plan.

CLEAR Talent does not offer SAML single sign-on or SCIM provisioning. If your IT policy requires either, record it as a risk the vendor cannot mitigate rather than leaving it for IT to discover.

Read the trust centre: GDPR tooling, hosting and the DPA

Section 5

A 30/60/90-day rollout plan

Finance wants to know when the money starts working. A 30/60/90-day plan answers that with milestones rather than a go-live date alone, and gives the case its first checkpoint. Treat the windows below as a starting shape: the vendor’s implementation scope sets the real dates, and CLEAR Talent scopes each rollout with the customer before work begins, so confirm the timetable before it goes into the case.

A 30/60/90-day rollout plan for performance management software
WindowFocusWhat happensDone when
Days 1–30Set upSign the DPA, clean reporting lines from the HRIS, import people and structure, configure the rating scale, form and stage deadlines, and set access rules for HR, managers and employees.A test review runs end to end for one team, and the DPO has signed off the configuration.
Days 31–60PilotTwo or three managers run real reviews, including on their phones if that is how they will work. Fix what confuses them, write the launch message from their questions and brief the remaining managers.The pilot managers would run their next cycle in the system, and the launch message is approved.
Days 61–90First cycleOpen the first cycle for the agreed population, let the reminders do the chasing, and run calibration in the system. Compare its reports with what the old tracker would have shown, then make the old spreadsheet read-only.The first cycle closes and the day-90 review reports completion, time per review and ratings with a recorded reason against the baseline.

If your review calendar puts the first real cycle further out, run a short mid-year or probation cycle in days 61–90 so the day-90 review has something to measure.

Use the performance management rollout checklist

Section 6

The one-slide summary

Most budget decisions are made from one slide, with the full case attached for anyone who wants to check it. Write the slide last, once every figure in it has a source in the template. Seven boxes are enough; the example wording comes from the 90-person company in the examples further down.

What each box of the one-slide business case summary says, with example wording
Box on the slideWhat it saysExample wording
The problemOne sentence, with the two most convincing numbers from the problem statement.Our two review cycles take managers 630 hours and HR 160 hours a year, close weeks late, and calibration changes ratings without a recorded reason.
Cost of doing nothingThe yearly running cost of the status quo, and the exposure you are not pricing.USD 45,000 a year in manager and HR time, plus unpriced exposure on pay decisions we cannot explain.
The proposalWhat you are buying, for whom, from when.Performance management software for all 90 employees, from the next mid-year cycle.
The costSubscription per year and one-off costs, separately.USD 5,049 a year on the published Pro plan, billed annually, plus USD 3,600 of internal setup time and a quoted setup fee in year one.
What we will measureThree outcomes, each with a baseline and a target.Reviews signed off on time; hours per review; every calibrated rating with a recorded reason.
Risks we have coveredThe top three risks, with the mitigation in a few words each.GDPR: DPA and DPO sign-off first. Adoption: manager pilot. Data: reporting lines cleaned before import.
The decisionExactly what you are asking for and by when.Approve a twelve-month subscription and the setup budget by 30 November, so the system is ready for the next cycle.

The performance management business case template

Template

Performance management business case

Fill in the case details once — each is one short paragraph or one figure in the finished document — then one row per cost or benefit line. Put a source beside every number; it is the first thing finance will ask for.

Performance management business case template fields
FieldWhat to write
The case on one page
Prepared by and forWho is asking, who decides — the CFO, a finance committee, the leadership team — the budget line it comes from and the date a decision is needed.
Problem statementTwo or three sentences on what the current process costs and risks, using the figures below rather than adjectives.
People in scopeEmployees reviewed, managers who write reviews and HR staff who run the cycle, and the review cycles per year.
Manager hours per cycleReviews written × hours per review. Say how you estimated the hours.
HR administration hours per cycleBuilding forms, chasing, consolidating, calibration packs and reporting, from the HR team’s records of the last cycle.
Loaded hourly costsOne rate for managers and one for HR — salary plus employer costs, divided by working hours. Take them from finance.
Turnover exposureRegretted leavers citing unclear expectations or no development, × finance’s cost per hire. Shown as exposure, not counted in the net figure.
Proposed solution and costThe vendor and plan, the annual subscription at your year-two headcount, one-off setup costs and the internal hours needed.
Expected outcomesThree outcomes, each with a baseline from the last cycle, a target and the date it will be reported.
Risks and mitigationsThe top three risks — usually GDPR, adoption and data migration — each with its mitigation and an owner.
30/60/90-day rolloutThe milestone that marks the end of each window, and the date of the day-90 review.
Decision requestedThe amount, the term, the start date and who signs — in one sentence.
For each cost line (up to 8)
Cost or benefit lineOne per row: manager time, HR administration, subscription, setup, data requests, turnover exposure.
How it is calculatedThe formula with its inputs, for example “90 reviews × 2 cycles × 3.5 hours × USD 60”.
Status quo, per yearWhat the line costs today. Zero for a licence you do not pay.
With software, per yearWhat it would cost after the change. Mark one-off costs as year one only.
DifferenceThe saving or the cost, in words: “saves USD 4,950” or “costs USD 5,049”. Write “not counted” for exposure lines.
Source and confidenceWhere the inputs came from, and high, medium or low confidence. Low-confidence lines are the ones to test in the pilot.

As a spreadsheet

One row per cost line. Copy the grid below and paste it into the first cell of a spreadsheet, or download the CSV.

Performance management business case template as a spreadsheet grid
#Cost or benefit lineHow it is calculatedStatus quo, per yearWith software, per yearDifferenceSource and confidence
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2
3
4
5
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8
Show the plain-text template
PERFORMANCE MANAGEMENT BUSINESS CASE

Prepared by and for:
Problem statement:
People in scope:
Manager hours per cycle:
HR administration hours per cycle:
Loaded hourly costs:
Turnover exposure:
Proposed solution and cost:
Expected outcomes:
Risks and mitigations:
30/60/90-day rollout:
Decision requested:

COST LINE 1
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 2
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 3
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 4
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 5
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 6
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 7
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

COST LINE 8
Cost or benefit line:
How it is calculated:
Status quo, per year:
With software, per year:
Difference:
Source and confidence:

Nothing here is gated: the spreadsheet and the text file hold exactly the fields shown above, with eight blank cost lines. Add the totals at the bottom in your own spreadsheet, and keep the exposure lines out of them.

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How to build a business case for performance management software in six steps

Allow a week or two of elapsed time, most of it waiting for figures from finance and managers. The order matters: agree what the decision-maker needs before you collect anything, and write the summary last.

  1. Agree what the decision-maker needs

    Ask finance three questions before you start: what format they expect, what threshold the spend falls under, and which loaded hourly rates and cost-per-hire figures they want you to use. A case built on finance’s own rates and format is half-approved before it arrives.

  2. Measure the baseline from your last cycle

    Collect manager hours, HR administration hours, completion against the deadline, ratings changed in calibration and any disputes or subject access requests from the last review cycle. Record the source of each figure and how confident you are in it.

  3. Price the status quo

    Turn the baseline into a yearly cost: hours × rates × cycles. Add exposure lines — turnover, decisions that cannot be explained — as descriptions or as figures kept out of the total.

  4. Price the software over three years

    Take the subscription at the headcount you expect in year two, add one-off setup costs once, add the internal hours to configure and launch, and estimate the time each cost line will take afterwards. Mark every “with software” estimate you will test in the pilot.

  5. Set outcomes and name the risks

    Choose three outcomes with a baseline, a target and a reporting date. List the risks — GDPR, adoption, data migration, AI, cost growth, lock-in — with a mitigation and an owner each, and take the GDPR section to your DPO before it goes to finance.

  6. Write the one-slide summary and the ask

    Condense the case into seven boxes: problem, cost of doing nothing, proposal, cost, what you will measure, risks covered and the decision. End with one sentence stating the amount, the term, the start date and who signs, then attach the full template behind it.

Business case examples: three organisations, three outcomes

Three filled-in cost tables. In the first, the time savings barely cover the cost and the case rests on something else; in the second, the time savings carry it; in the third, the subscription is quoted rather than published, so the case goes to finance with that line still to fill. Subscription lines use CLEAR Talent’s published list prices, billed annually; every time figure is the organisation’s own estimate.

These organisations, their figures and their estimates were written for this page to show how the template works. They do not describe a real organisation or any CLEAR Talent customer, and the time estimates are not a forecast of what any organisation will save.

Small consultancy

Example 1: a 45-person consultancy where the numbers are close

Six managers, one annual review, and an office manager who runs the cycle in a spreadsheet. On time alone the case is thin: year one nets out at USD 556 before the quoted setup fee. The office manager says so plainly and rests the case on something the spreadsheet cannot do — ratings now feed a new bonus scheme, and the firm wants a record of why each rating was given before the first bonus is paid.

People in scope
45 employees, 6 managers, 1 office manager; one cycle a year
Loaded hourly costs
USD 55 for managers, USD 40 for the office manager, from the finance partner
Decision requested
A twelve-month subscription, approved by the managing partners in December
Example 1: a 45-person consultancy where the numbers are close
Cost or benefit lineHow it is calculatedStatus quo, per yearWith software, per yearDifferenceSource and confidence
Manager time45 reviews × 1 cycle × 3 hours × USD 55; afterwards 2 hours a reviewUSD 7,425USD 4,950Saves USD 2,475Show of hands at a managers’ meeting. Medium confidence; test in the trial.
HR administration40 hours a cycle × USD 40; afterwards 10 hoursUSD 1,600USD 400Saves USD 1,200Office manager’s timesheet for last year’s cycle. High confidence.
SubscriptionBasic plan at 45 staff users, billed annuallyUSD 0USD 1,469Costs USD 1,469Published list price on the CLEAR Talent pricing page. High confidence.
Setup30 internal hours × USD 55, plus the setup fee, which is quotedUSD 0USD 1,650 plus quote, year one onlyCosts USD 1,650 plus quoteOffice manager’s estimate; fee to be confirmed in writing. Low confidence.

Growing company

Example 2: a 90-person company where time savings carry the case

Nine managers, a mid-year and a year-end review, a calibration meeting and ratings that feed the pay review. The HR manager’s figures show USD 7,101 net in year one before the quoted setup fee, and USD 10,701 a year after that, on estimates the pilot will test. Two regretted leavers are shown as exposure and kept out of the total, which is the line the finance director said made the rest believable.

People in scope
90 employees, 9 managers, 3 HR staff; two cycles a year
Loaded hourly costs
USD 60 for managers, USD 45 for HR, from finance
Decision requested
A twelve-month subscription and the setup budget, approved by 30 November
Example 2: a 90-person company where time savings carry the case
Cost or benefit lineHow it is calculatedStatus quo, per yearWith software, per yearDifferenceSource and confidence
Manager time90 reviews × 2 cycles × 3.5 hours × USD 60; afterwards 2.5 hours a reviewUSD 37,800USD 27,000Saves USD 10,800Five managers’ estimates of their last reviews. Medium confidence; test in the pilot.
HR administration80 hours a cycle × 2 cycles × USD 45; afterwards 25 hours a cycleUSD 7,200USD 2,250Saves USD 4,950HR team diary for the last two cycles. High confidence.
SubscriptionPro plan at 90 staff users, billed annually — chosen for development plans and the mobile appsUSD 0USD 5,049Costs USD 5,049Published list price on the CLEAR Talent pricing page. High confidence.
Setup60 internal hours × USD 60, plus the setup fee, which is quotedUSD 0USD 3,600 plus quote, year one onlyCosts USD 3,600 plus quoteHR manager’s estimate; fee to be confirmed in writing. Low confidence.
Turnover exposure2 regretted leavers citing no development conversation × USD 20,000 cost per hireUSD 40,000Not estimatedNot countedExit interviews and finance’s cost per hire. Shown as exposure only.

Multi-site organisation

Example 3: a 350-person organisation with a quoted subscription

Three sites, 28 managers and two cycles a year. The published plans stop at 100 staff users, so the subscription is quoted and the HR director sends the case to finance with that line marked “to follow”, asking for approval in principle on the time figures and the risks. Subject access requests appear as their own line because the last three each took most of a week to answer.

People in scope
350 employees, 28 managers, 3 HR staff; two cycles a year
Loaded hourly costs
USD 65 for managers, USD 50 for HR, from finance
Decision requested
Approval in principle now; final approval when the written quote arrives
Example 3: a 350-person organisation with a quoted subscription
Cost or benefit lineHow it is calculatedStatus quo, per yearWith software, per yearDifferenceSource and confidence
Manager time350 reviews × 2 cycles × 3 hours × USD 65; afterwards 2 hours a reviewUSD 136,500USD 91,000Saves USD 45,500Survey of managers at two of the three sites. Medium confidence.
HR administration160 hours a cycle × 2 cycles × USD 50; afterwards 50 hours a cycleUSD 16,000USD 5,000Saves USD 11,000HR team timesheets. High confidence.
Subject access requests6 requests a year including review records × 10 hours × USD 50; afterwards 2 hours each from the system’s exportUSD 3,000USD 600Saves USD 2,400HR case log for the last year. High confidence on hours today, medium afterwards.
SubscriptionEnterprise plan, quoted because the organisation is past the 100-staff-user limit of the published plansUSD 0From the written quoteTo followVendor proposal requested. Fill in before final approval.

If CLEAR Talent is on your shortlist

The CLEAR Talent figures for your business case

The subscription line can be filled in without a sales call: Basic is USD 39 a month for 1 admin user and 10 staff users, Pro is USD 295 a month for 3 admin users and 50 staff users, with published rates for additional users, and Enterprise is quoted. Annual billing saves 15%, and setup fees are quoted depending on the package, so ask for that figure in writing. There is a free 1-month trial, which is long enough to run the manager pilot in the rollout plan and test the time estimates in your case before the subscription starts.

The time savings in the case come from how the review cycle runs. Self-assessment, manager review, calibration and final rating each carry their own deadline, with automated reminders on whatever is outstanding. Goal scores, competency ratings and 360° input reach the review without anyone re-keying them, calibration happens inside the cycle, and every change to a rating or comment is logged with who, what and when. Reports export to PDF or Excel.

For the risks section: subject access request exports, right-to-be-forgotten workflows, role-based access and a data processing agreement are part of the platform, and records export as CSV, Excel or PDF on every plan. CLEAR Talent runs beside your HRIS, with data brought in by CSV or Excel bulk import or the API rather than a prebuilt connector, and it offers no SAML SSO or SCIM — worth stating in the case if your IT policy asks for them.

Frequently asked questions

What should a business case for performance management software include?
A problem statement built from your own figures, the cost of the status quo against the cost of software over three years, three outcomes with a baseline and a target, the main risks with mitigations — usually GDPR, adoption and data migration — a 30/60/90-day rollout plan and a one-slide summary that ends with the decision you are asking for.
How do you calculate the ROI of performance management software?
Price the manager and HR hours the current process takes per cycle at finance’s loaded hourly rates, estimate the hours afterwards, and subtract the subscription, one-off setup and internal launch time, over three years. Use your own baseline rather than a vendor’s average, keep turnover out of the net figure as exposure, and test the time estimates in a pilot or trial before relying on them.
How do you calculate the cost of the status quo?
Add up the hours the last review cycle took — managers writing reviews, employees completing self-assessments, HR building forms, chasing and consolidating — and multiply by loaded hourly rates and the number of cycles a year. Then describe the costs that are hard to price: ratings changed without a recorded reason, disputes and subject access requests, and regretted leavers.
Should turnover savings go in the business case?
Show them as exposure rather than as a saving. Count regretted leavers whose exit interviews cite unclear expectations or no development, multiply by the cost per hire finance already uses, and keep the figure out of the net total. Too much else affects turnover for finance to accept it as a saving, and a case that does not depend on it is more credible.
How do you address GDPR in a business case for HR software?
Treat it as a named risk with a mitigation and an owner. Involve your data protection officer before the contract, ask the vendor for its data processing agreement, subprocessor list and hosting location, and confirm how subject access requests and erasure work. Ratings and review comments are personal data, so access controls and an audit trail belong in the mitigation too.
How long should the business case be?
One slide for the meeting and one or two pages behind it, with the cost table attached as a spreadsheet. Finance reads the summary and checks the sources; length rarely helps, but a figure with no source almost always sends the case back.

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