How this calculator works out one deal
A deal's commission isn't always deal × rate. If the deal crosses a tier line, part of it is paid at one rate and part at another. On a retroactive plan it can even change what you earned on earlier deals. So the calculator works it out the reliable way: it figures your total commission for the period with the deal and without it, and the difference is what the deal pays you.
Worked example: a deal that crosses quota
Quota is $600,000. You've closed $580,000. You're about to close a $50,000 deal. Tiers are 8% from 50–100% of quota and 12% above 100%.
- The first $20,000 gets you to quota and earns 8%: $1,600
- The other $30,000 is above quota and earns 12%: $3,600
- Total: $5,200, an effective 10.4% on the deal
On a retroactive plan the same deal would move your whole $630,000 to 12%. It would pay $29,200, because it also re-prices the $580,000 you'd already closed. (Enter these numbers above and switch the method to see it.)
What a discount really costs you
Near a tier line, a discount costs you more than its face value. In the example above, giving 10% off ($45,000 instead of $50,000) cuts your commission from $5,200 to $4,600. That's 11.5% less, because the dollars you gave away were the ones being paid at 12%. Before you agree to a discount at the end of the quarter, run both numbers.
Splits, SPIFs and timing
- Split deals: if you share credit with another rep or an overlay, enter your share (e.g. 50%). Only your share counts toward your tiers.
- SPIFs: short-term bonuses for a product or a time window. Most are paid on top of normal commission, so add them in the SPIF box.
- When you get paid: many plans pay a month or more after the deal closes. Some only pay once the customer pays the invoice. Ask which date your plan uses (signature, booking, go-live or cash collected) so you know which paycheck it will land in.
Why the take-home number is lower
In the US, commission is usually treated as supplemental wages. Employers often withhold federal tax at a flat rate (22% for most people), plus Social Security and Medicare (7.65% combined) and any state tax. That's why commission checks can feel smaller than expected. Withholding isn't your final tax bill; that gets settled when you file. The 30% default here is only a rough planning number.
FAQ
How do I calculate commission on a single deal?
Work out your total commission for the period with the deal included, then subtract your commission without it. That difference is what the deal pays, and it handles tier crossings correctly. This calculator does it for you.
Why did my deal pay less than deal size × my rate?
Usually because part of the deal fell in a lower tier, your credit was split, or the plan credits a different amount (for example first-year ACV instead of total contract value). Payroll withholding also makes the check look smaller.
How do split deals affect commission?
On a split deal you only get credit for your share. If you get 50% credit on a $40,000 deal, $20,000 counts toward your quota and tiers.
What is a SPIF?
A SPIF (sales performance incentive fund) is a short-term bonus for selling a specific product or hitting a goal in a time window. It's usually paid on top of regular commission.