Sales Commission Calculator

Model a UK commission plan in seconds. Set the quota, the base rate and the accelerator that applies above quota, then change the revenue closed to see what a rep actually earns. Nothing is sent anywhere — it all runs in your browser.

What this calculator does not model

It covers the common UK shape: one rate up to quota, an accelerated rate above it. That is enough to sanity-check a plan on paper, and it is roughly where most commission spreadsheets start. It is not where they end.

Real plans add caps and decelerators, recoverable and non-recoverable draws, splits between reps on a shared deal, clawbacks when a customer cancels or a placement falls through, proration for joiners and leavers, and quota changes mid-period. Each of those is usually bolted onto the spreadsheet by hand, and each is a place a silent error can sit for months — the kind that only surfaces when a rep runs their own shadow calculation and disagrees with payroll.

If you want the detail on where that goes wrong, we wrote up the five things a calculator can't handle. If the plan you are modelling is already past what a spreadsheet can hold, that is what Commit does.

Frequently asked questions

How do you calculate sales commission?

Multiply the revenue a rep closed by their commission rate. Where a plan uses an accelerator, revenue up to quota is paid at the base rate and revenue above quota at the base rate multiplied by the accelerator. For example, on a £600,000 quota at 8% with a 1.5× accelerator, £700,000 closed pays £48,000 on the first £600,000 plus £12,000 on the £100,000 above it.

What is a commission accelerator?

An accelerator is a higher rate applied only to revenue above quota, used to keep reps selling once target is hit. A 1.5× accelerator on an 8% base rate means every pound above quota earns 12%.

Does this calculator account for tax and National Insurance?

No. It models gross commission earned. UK commission is taxed as ordinary employment income through PAYE at the rep's marginal rate and attracts Class 1 National Insurance in the normal way, and employers pay Class 1 Secondary NICs on top. Budget for the employer NIC separately when you size a comp plan.

Why do commission calculators break in real life?

A calculator models one rep, one plan and one clean period. Real plans add caps, decelerators, draws, splits between reps, clawbacks on cancelled deals, mid-period quota changes and proration for joiners and leavers. Those interactions are where spreadsheets produce silent errors, because each exception is usually handled by hand.

Is this commission calculator free?

Yes. It runs entirely in your browser, needs no sign-up, and nothing you type is sent anywhere.