How to Calculate Pro Rata Commission on a Partial Deal

Pro rata commission divides a payout according to the share of the work, the share of the deal, or the share of the period each person covered. A full commission assumes one rep owned the whole deal for the whole period. When several reps split a deal, a rep joins mid-month, or a deal only partially completes, the payout is prorated. This guide covers the three cases with worked numbers.

For a quick answer on your own figures, the pro rata calculator on the homepage does the division for you.

Splitting a commission between reps

Agree on each rep's contribution share first, then apply the formula:

• Rep's commission = total commission × (rep's share ÷ 100)

• Deal commission: $15,000
• Rep A closed the account: 50%
• Rep B ran the demos: 30%
• Rep C sourced the lead: 20%
• Payouts: $7,500, $4,500, $3,000

The shares are whatever the team agrees on, but they must total 100%. Split disputes almost always trace back to a share that was assumed instead of agreed.

Prorating a quota for a partial month

New hires rarely start on day one. A rep who joins on the 10th of a 30-day month covers 21 days, so a $60,000 monthly quota becomes:

• 21 ÷ 30 × $60,000 = $42,000
• Hitting $42,000 counts as 100% of quota, and accelerators apply above it

Without proration, the rep would need a full month of target in two-thirds of a month. Most plans prorate the target, not the payout rate. Check whether tier thresholds move with the quota or stay fixed, because that decision changes the commission on every deal above the prorated target.

The same rule applies to promotions: a rep moved to a higher quota mid-quarter usually carries a blended target, prorated by the days spent on each plan.

Commission on a partially completed deal

Some plans pay in stages. A $24,000 contract at a 10% commission rate might pay 50% at signature and 50% at go-live:

• Signature stage: $12,000 booked, commission $1,200
• Go-live stage: $12,000 booked, commission $1,200
• If go-live is cancelled, total commission is $1,200, not $2,400

If the plan pays on collected cash instead of bookings, a customer that pays half an invoice generates half the commission in that period, with the rest following the money.

The traps in commission proration

• Verbal splits. Put the percentage split in the CRM deal or a team email before the deal closes. Reversing a payout after the fact is much harder.
• Clawbacks. Many plans take commission back if the customer cancels within 90 to 120 days. In split deals, the clawback usually follows the same split as the payout.
• Tier boundaries. Accelerators often apply per deal, not across prorated portions. Confirm whether a partial month's quota unlocks the full tier rate or a prorated one.
• The wrong base. Commission can be calculated on revenue, margin, or collected cash. Split the base the plan defines, not the invoice total.

Bonus proration follows the same partial-period logic, and our guide on how pro rata bonuses work shows the mid-year hire version.

Frequently asked questions