How to Calculate Sales Commissions

Last updated: August 2026

A sales commission is calculated by multiplying the deal's revenue by the agreed rate. The short formula is Revenue x commission rate. What almost everyone gets wrong is the revenue part: it is not list price, but the price after discount and — in many companies — after an adjustment for payment terms.

Free sales commission calculator — no signup, with discount, accelerator and payment terms.

Formula

Net revenue       = list amount x (1 - discount)
Adjusted revenue  = net revenue x payment-terms factor
Commission        = adjusted revenue x commission rate x tier multiplier

The tier multiplier is 1 in a flat plan. In an accelerated plan it changes with the tier reached: quota, volume, or — the most useful case — margin level.

Worked example

A USD 100,000 deal, with a 10% discount, paid net 30, a 5% base commission and the standard tier (x1.0):

Net revenue       = 100,000 x 0.90        = 90,000
Adjusted revenue  = 90,000  x 0.95        = 85,500
Commission        = 85,500  x 0.05 x 1.0  = 4,275

With no discount and cash terms, the same deal paid USD 5,000. The 10% discount and the 30-day terms cost USD 725 of commission — 14.5% less. That is what a concession usually decided in under a minute costs the rep.

Scheme types

Scheme	How it works	When it fits
Flat rate	One percentage on all revenue.	Small teams, single product, short cycle.
Tiered by quota	The rate rises as attainment tiers are passed.	Driving the annual quota home.
Margin accelerator	The multiplier depends on the deal's margin.	When discounting is the main profitability leak.
By product or mix	A different rate per product line.	Catalogs with very uneven profitability.
On gross margin	Commission is paid on margin, not on revenue.	Resale and services with clear direct cost.

Common mistakes

Paying on list price. You pay commission on money the company never collected.
Ignoring payment terms. A net-90 deal is not worth what a cash deal is worth.
Not netting refunds and cancellations. Without a clawback clause the commission outlives the revenue.
Running it in unversioned spreadsheets. Nobody can reproduce last quarter's payout.
Confusing commission with profitability. See the next section.

Commission is not margin

Commission tells you what the rep earns. Discount tells you what you gave away. Neither one, on its own, tells you whether the deal was profitable — that requires the cost of what was sold.

Commission = adjusted revenue x rate   (no cost needed)
Margin     = revenue - cost             (impossible without cost)

That is why a calculator fed only amount, discount and rate cannot report margin, and any tool claiming otherwise is inventing the cost. The question that matters is not "how much commission do I earn?" but "how much do I actually make on this deal, and how much am I giving up to close it?".

When to automate the calculation

A spreadsheet is fine while the plan is flat and the team is small. Automate once any of these appear:

More than one plan running at once, or tiers and accelerators.
Recurring disputes about payouts for closed periods.
A need to see the commission before the quote goes out, not after the close.
Discounts approved with no visibility of their margin impact.

Revenue Quality Engine computes commission from versioned rules and, on the same data, the deal's Revenue Score: profitability, risk and revenue quality before the discount is decided.

Frequently asked questions about commission calculation

How do you calculate a sales commission?

Multiply the deal's revenue by the agreed rate. The correct revenue is the price after discount and, if the company adjusts for payment terms, multiplied by the terms factor. Formula: commission = amount x (1 - discount) x terms factor x rate x tier multiplier.

How do you calculate a sales commission with a discount?

Subtract the discount before applying the rate. On a USD 100,000 deal with a 10% discount and a 5% rate, the commission is 100,000 x 0.90 x 0.05 = USD 4,500, not USD 5,000.

What is a commission accelerator and how is it applied?

It is a multiplier that raises the payout once a quota, volume or margin tier is passed. It is applied last: base commission x tier multiplier. A x1.3 premium tier on a USD 4,275 base commission pays USD 5,557.50.

Is commission calculated on revenue or on margin?

It depends on the plan. Revenue-based is the most common and needs no cost data. Gross-margin-based aligns the rep with profitability, but requires an accurate cost of goods sold.

How much does a 10% discount reduce my commission?

Roughly 10% in a flat plan, because the discount shrinks the calculation base proportionally. With a margin accelerator the drop can be larger, since the discount may also push the deal into a lower tier.

Can a commission calculator tell me whether the deal is profitable?

No. Amount, discount and rate are enough to compute commission, but not margin: margin needs the cost of what was sold. Any tool reporting profitability without receiving a cost is assuming one.

When should you stop using a spreadsheet and automate the calculation?

When several plans run at once, tiers and accelerators are involved, payout disputes for closed periods keep recurring, or the commission needs to be visible before the quote goes out.

Run the commission calculator with your own numbers, or create a Revenue Quality Engine account to see commission, margin and the deal's Revenue Score before the discount is approved.