Free AP Automation ROI Calculator
Model annual savings, payback period, and hours freed from automating invoice processing. Build the internal business case before picking a vendor like NetSuite, Tipalti, or Gruv.
Inputs
Adjust sliders to model your current AP workload.
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Average monthly invoices across all entities.
Includes labor, approvals, and exception handling.
Team members handling invoice intake and approvals.
Percent of invoices that need rework or manual follow-up.
Longer cycles usually mean more touchpoints and approvals.
Planning model
This ROI model gives a planning-grade savings view for prioritization. Calibrate with your invoice data and final vendor pricing before approval.
- Use real invoice volumes and processing costs for the strongest planning view.
- Automation costs vary by workflow depth, integrations, and approval rules.
The assumptions are the model
Four of the numbers behind the result come from the code rather than from you. The savings rate starts at 48% and moves with the error rate and the payment days you set, held inside a floor of 35% and a ceiling of 75%. Rework is charged at 35% of the manual cost for the share of invoices you say go wrong. The automation side is priced at $18,000 a year plus $1.50 an invoice, standing in for a license you have not quoted yet, and each invoice is assumed to take 0.33 of an hour. Shift the starting rate by ten points and every output shifts with it, so treat this as a way to test a business case.
Say 24,000 invoices a year at $11 of internal cost each, an error rate of 6%, and invoices paid at 32 days. The manual side is $264,000, rework adds $5,544, and the model starts from $269,544. The rate lands at 59.2%: 48 to start, 7.2 for the errors, 4 for the payment window. That gives $159,570 of modeled savings against $54,000 of modeled automation cost, and payback a little over four months. Drop the error rate to 1% and the same volume returns $140,940 with payback nearer five months. One input moved the answer by $18,630 without changing a single invoice.
The question a finance director asks next is where the saving actually lands, and it is the right question to ask. Process savings arrive as hours, and hours turn into money only when something changes: a vacancy left open, overtime that stops, a backlog that clears without a temp. The capacity line is the honest unit here, since it divides the hours freed by a 2,080 hour year. On the numbers above that is roughly 4,690 hours, which reads as two and a quarter people of capacity and converts to cash only if you decide what those people do next.
The model behind the savings figure
Every figure this returns is your own volumes run through a small set of coefficients we chose. None of those coefficients comes from a published study.
What it assumes
- Manual cost is invoices per month times your cost per invoice, annualised.
- The automation rate starts at 48% and moves up with your error rate and days to pay, held between 35% and 75%.
- Rework is charged as 35% of the manual cost on the share of invoices that carry an error.
- Freed capacity is valued at 0.33 hours per invoice against a 2,080 hour working year.
- The cost of automating is modelled as $18,000 a year plus $1.50 an invoice, and the payback figure divides that cost by the savings.
What it leaves out
- Implementation cost, integration work and the months before a new process settles, all of which sit outside that annual figure.
- Any published benchmark. The coefficients are ours and are meant to be replaced.
- Cash-flow effects of paying earlier or later, beyond the days-to-pay nudge to the automation rate.
- Headcount decisions. Freed hours are shown as capacity rather than as savings realised.
Where the numbers come from
- The 48% base automation rate
- Our own assumptionA starting coefficient chosen for this page so the slider has a sensible centre. No study stands behind the number.
- The 35% rework factor and 0.33 hours per invoice
- Our own assumptionTwo further coefficients chosen for legibility. Calibrate both against your own invoice data before taking the total to an approval.
- The 2,080 hour year
- Our own assumptionCalendar arithmetic of 40 hours across 52 weeks, used to turn freed hours into a share of a role.
- The $18,000 plus $1.50 an invoice automation cost
- Our own assumptionTwo more figures chosen for this page, standing in for a subscription and a per-invoice charge. They set the payback period, so replace them with pricing you have been quoted.
Assumptions and sources checked 5 September 2026. Published figures move on their own schedule, so confirm anything you rely on against the authority that issues it.
How it works
- 01
Enter invoice volume
Monthly or annual volume across your entities.
- 02
Add cost per invoice
Labor, approvals, exception handling, overhead.
- 03
Set automation uplift
Expected reduction in cost per invoice.
- 04
See ROI + payback
Annual savings and break-even window.
Related guides
How to Make the Case for AP Automation to Your CFO: A Platform Finance Team Playbook
The next action after a payback figure: a verified baseline, named control owners, and an approval ask with go or no-go gates.
Read the guideAccounts Payable Automation ROI for Platforms That Need Defensible Results
Why projected payback drifts once the work lands, which is the main reason a model like this comes out optimistic.
Read the guideAccounts Payable KPIs: The 15 Metrics Every Payment Platform Finance Team Should Track
The baseline measures the inputs assume you already have, including cost per invoice and approval cycle time.
Read the guideFrequently Asked Questions
How does the ROI calculator estimate savings?+
What goes into "cost per invoice"?+
Does this include software license pricing?+
Can I use this for multi-entity or global AP teams?+
Is this financial advice?+
The ROI is the business case. Gruv is the rollout
Gruv operationalizes the AP workflow this model projects: approvals, compliance gates, multi-rail payouts, and reconciliation exports into QuickBooks, Xero, or NetSuite.
Many teams start with a narrow launch in weeks.