Accounting for sales commissions the right way

Commissions look simple. You pay a rep a slice of what they close, and everyone is happy. But the money usually goes out in a different period than the sale that earned it, and that gap is where the accounting goes wrong. Book the expense in the wrong month and every gross margin, every profit number, and every commission-heavy forecast you show an investor is quietly off.

Getting this right is mostly about one idea repeated in a few places: the cost of a sale belongs in the same period as the sale, no matter when the check clears.

Commissions are variable pay, not a fixed cost

A salary is fixed compensation. It is the same $8,000 whether the rep closes ten deals or none. A commission is variable compensation — pay that moves with a result, usually a percentage of revenue booked or collected. That link between effort and payout is exactly what makes the accounting trickier than a plain salary. The amount is not known until the deal closes, and the deal often closes weeks before payroll runs, so you cannot simply wait for the payroll run to record it. You have to capture the obligation the moment it exists.

Match the expense to the sale that earned it

The matching principle says you record an expense in the same period as the revenue it helped produce. A commission is a textbook case. The sale creates two things at once: revenue for the company and a payment owed to the rep. Both belong in the same month, even though the cash for the commission usually leaves in the next payroll cycle.

Here is a worked example. On March 22, your rep closes a $30,000 annual deal. The plan pays 10%, so the rep has earned $3,000. Payroll for that period does not run until April 5. You do not wait. In March, you record an accrual: debit commission expense $3,000, credit accrued commissions (a liability) $3,000. That puts the full cost of the March sale in March, where it belongs.

When April payroll runs and the $3,000 is actually paid, you clear the liability instead of recording a new expense: debit accrued commissions $3,000, credit cash. The expense was already counted in March. If you skipped the accrual and simply booked the whole thing in April, March would look artificially profitable and April would take a hit it did not earn.

Where commissions sit on your P&L

For most companies, commissions are a selling expense — part of operating expenses (OpEx), grouped with the rest of your sales and marketing costs. They are the cost of winning business, not the cost of delivering it, so they usually sit below the gross-margin line rather than inside cost of goods sold.

There is one important exception worth knowing. Under ASC 606, the revenue recognition standard, the incremental costs of obtaining a contract — and a commission you would not have paid if the deal had not closed is the clearest example — must be capitalized and amortized when the contract benefits the company over more than a year. Say you pay a $12,000 commission to land a three-year contract. Instead of expensing all $12,000 up front, you record it as an asset and amortize it over the period the customer relationship is expected to last, often around $4,000 a year. The rules for who this applies to and how strictly are worth a short conversation:

• One-time or short deals paid in the same year: expense the commission now, no capitalization needed
• Multi-year contracts with commissions you only pay on a win: capitalize and amortize over the benefit period
• Renewal commissions that are much smaller than the initial commission: amortize over the expected customer life, not just one term
• Small, immaterial amounts: many private companies apply a practical exception and expense them as incurred

Commissions are wages — withhold like it

A commission paid to an employee is wages, full stop. It is not a vendor payment and it does not belong on a 1099 or in some off-books spreadsheet. It runs through payroll and it is subject to income tax withholding, Social Security and Medicare (FICA), and unemployment taxes, with the employer paying its share on top.

The IRS treats commissions as supplemental wages. If you pay them separately from a regular paycheck, you can withhold federal income tax at the flat supplemental rate of 22%. On our $3,000 example, that is $660 of federal withholding before state tax and the employee's FICA come out, so the rep nets meaningfully less than $3,000 — and you, the employer, owe roughly another $230 in matching FICA on top of the $3,000. Budget for the employer cost, not just the gross payout.

Plan for clawbacks before you need them

Sales do not always stick. A customer cancels inside the refund window, a deal churns in month two, or a signed contract falls apart before it is funded. If you already paid the rep on that revenue, you now have a clawback — a recovery of commission on business that reversed. Your commission plan should name the triggers in writing, and your books should be ready to unwind cleanly.

If refunds and early churn are a regular part of your business, do not wait until each one happens. Estimate the share of commissions likely to reverse and accrue a small clawback reserve against it, the same way you would reserve for bad debt. When a specific deal reverses, you draw against the reserve rather than taking a lumpy hit that distorts the month. If clawbacks are rare and small, handling them one by one is fine — the point is to decide the policy on purpose, not to discover it during diligence.

None of this is exotic. Accrue at the sale, classify it as selling expense unless a multi-year contract pulls it under ASC 606, run it through payroll as wages, and reserve for the deals that come apart. Do that consistently and your commission line will tell the truth about your margins every month.