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Most advice on the sales rep commission structure question is a list — flat rate, tiered, accelerators, gates — dumped on you with no guidance on which one fits your team. That's useless when you're the one who has to pick, defend the choice to finance, and live with it for a year. The right structure isn't a matter of taste. It's a function of three measurable variables about your team, and once you know them the answer is close to deterministic.
The right sales rep commission structure depends on three variables: team size (1–5 reps vs 10+ vs 50+), sales cycle length (transactional vs multi-month enterprise), and deal size variability (all deals roughly the same vs a £5k–£500k spread). Small teams with short cycles and uniform deals should run a simple flat or single-tier plan. Larger teams with long cycles and highly variable deal sizes need tiered rates, accelerators, and — critically — payout timing that waits until contract value is firm. In the UK, remember commission is taxed as employment income through PAYE and attracts employer National Insurance at 15%, so the structure you pick has a direct payroll cost.
We've designed and untangled a lot of schemes, and the failures almost always trace back to a structure that was too complex for the team it ran on, or too simple for the deals it had to price. Below is the framework we actually use, followed by worked examples for each branch.
What are the three variables that decide your commission structure?
Before you look at a single plan type, measure these three things about your sales motion. Everything else follows.
| Variable | Why it matters | What it pushes you toward |
|---|---|---|
| Team size | Governs how much complexity you can administer and how much internal competition helps vs hurts | More reps → more standardisation, gates, and automation |
| Sales cycle length | Determines how long money is 'in flight' and how much can change before cash lands | Longer cycles → milestone-based payout, clawback protection |
| Deal size variability | A wide spread means one deal can dwarf a quarter's target | High variability → tiers and caps-or-decelerators, firm-value payout |
The mistake is treating these independently. A 3-rep team selling uniform £8k deals on a 14-day cycle and a 40-rep team selling £5k–£400k deals on a 4-month cycle are not running variations of the same plan — they're running different species of plan.
Comp logic that works on a £10k, 14-day SMB deal does not survive a £350k, multi-threaded enterprise one.
How does team size change the structure?
Team size decides how much plan complexity you can actually run. Complexity has an administrative cost that scales with headcount, and the payoff from fine-tuned incentives only shows up once you have enough reps for patterns to emerge.
- 1–5 reps: Keep it flat or single-tier. A single commission rate on booked revenue, paid monthly, is enough. You don't have the volume to justify accelerator maths, and every hour spent modelling tiers is an hour not spent selling. See our guidance on commission plans for small sales teams for the specifics.
- 6–15 reps: Introduce a tier or a quarterly accelerator to reward over-attainment, because you now have enough reps that a stack-ranked top performer earns real upside. This is the sweet spot for tiered plans.
- 50+ reps: Standardise hard. Role-specific plans (SDR, AE, AM), gates to stop reps earning on unqualified pipeline, and mandatory automation. At this scale a spreadsheet error isn't an inconvenience — it's a payroll incident across dozens of people. This is where dedicated commission software stops being optional.
How does sales cycle length change the structure?
Sales cycle length decides when you should pay, not how much. The longer the gap between signing and cash actually landing, the more can change — and the more dangerous it is to pay on the signing-day headline number.
For a transactional cycle (days to a few weeks), pay monthly on booked revenue. The deal closes, the money arrives, you pay — simple. For a multi-month enterprise cycle, split the payout against milestones: a portion on signature, the balance once the contract clears its opt-out or ramp period. This isn't bureaucracy for its own sake. In practice, the single most damaging comp event we've seen came from a rush to pay on gross signing-day value before a deal's opt-out window had closed.
When a deal carries opt-out, ramp, or cancellation clauses, calculate commission on the value actually locked in — not the signing-day total. A top AE we watched earned a life-changing accelerator payout on a Closed-Won deal, then took a brutal clawback weeks later when the client exercised a 30-day opt-out on one expensive module. Nobody acted in bad faith; finance just followed the maths. His momentum died and he left within a quarter. The correction did the cultural damage, not the original error.
If your cycle is long, read our commission clawback policy guide alongside this — payout timing and clawback design are the same problem viewed from two ends.
How does deal size variability change the structure?
Deal size variability decides whether you need tiers, decelerators, and firm-value payout. If every deal is roughly the same size, a flat rate is fair and predictable. If your deals range from £5k to £500k, a flat rate hands an enormous, possibly unbudgeted payout to whoever lands the whale — and exposes you if that whale later shrinks.
High variability is also where accelerators get dangerous. An accelerator that rewards over-attainment also multiplies the damage when a big deal later shrinks: the rep was paid an enhanced rate on a number that then falls, so the clawback is larger than the original overpayment. The steeper the accelerator and the larger the deal, the more it pays to hold the enhanced payout until the value is firm.
There's a threshold worth naming. In mid-market, once a deal crosses roughly £100k it stops being a clean 'closed-won' number — custom clauses, opt-outs, security reviews and legal redlines appear, and that's exactly where commission errors hide. If your deal range routinely crosses that line, build the structure to expect it: firm-value payout, a manager sanity-check before payroll, and either a cap or a decelerator on the top band so a single outlier can't blow the comp budget.
Worked examples: which structure for which team?
- 8 reps, £20k ACV, 60-day cycle, tight deal spread. Use a tiered plan with a quarterly accelerator. Pay monthly on booked revenue up to quota, apply the accelerated rate on attainment above 100% at quarter end once the numbers are confirmed. Enough reps to make tiers worthwhile; cycle short enough that monthly payout is safe; deal spread tight enough that you don't need heavy clawback machinery.
- 4 reps, £6k ACV, 10-day transactional cycle. Flat rate on booked revenue, paid monthly. No tiers, no accelerators. The admin cost of anything fancier outweighs the incentive gain at this size, and short uniform deals carry little downstream risk.
- 25 reps, £5k–£400k range, 4-month enterprise cycle. Tiered plan, role-specific, with milestone-based payout: part on signature, the balance after the opt-out/ramp window. Cap or decelerate the top band. This is the highest-risk profile — long cycle plus wide spread — and the one where automation and a pre-payroll audit earn their keep.
- 2 reps, £50k ACV, 90-day cycle. Single-tier plan but with split payout timing. Too few reps to justify tiers, but the deal size and cycle length mean you still shouldn't pay the whole thing on signing day.
Notice the pattern: as you move down the list toward larger, longer, more variable, the structure gains payout discipline and loses payout speed. That trade-off is the whole game.
What UK tax and payroll constraints affect your structure?
Whatever structure you land on, three UK-specific facts shape its real cost and timing.
Commission is taxed as employment income through PAYE. According to HMRC's Employment Income Manual, a commission that counts as earnings from employment is always chargeable to tax as employment income (EIM64615). You deduct income tax and employee National Insurance through payroll like any other pay — there's no special commission tax rate, despite what reps sometimes believe. Our guide to how commission is taxed in the UK covers the rep-facing side.
Commission is taxed in the period it's paid, not when it's earned. HMRC's CWG2 employer guide states that extra payments such as commission and bonuses are treated as part of total pay at the time they're paid, regardless of when they were earned (CWG2 further guide to PAYE and NICs). This matters for quarterly accelerators: a lumpy quarter-end payout can push a rep into higher-rate tax for that month under PAYE, even if it evens out across the year.
Every pound of commission carries employer National Insurance. As of 2026-07-17, employers pay secondary Class 1 NICs at 15% on earnings above the secondary threshold, which HMRC set at £5,000 a year from 6 April 2025 (Changes to the secondary threshold and rate; rates and thresholds for employers 2025 to 2026). So a £15,000 commission payout costs the business roughly £2,250 in employer NIC on top. A steep accelerator isn't just a bigger cheque to the rep — it's a bigger NIC bill too. Budget the loaded cost, not the headline rate. We go deeper in our breakdown of the employer NIC cost of commission.
Finally, whatever you choose has to reach payroll cleanly. If you run Xero, the structure should export as a clean, reconciled figure per rep per pay run — not a spreadsheet tab someone re-keys under quarter-end pressure.
Frequently Asked Questions
What is the most common sales rep commission structure in the UK?
A tiered commission structure on top of a base salary is the most common for UK B2B sales teams, typically framed as an OTE split such as 70/30 or 80/20 base-to-variable. Flat-rate plans are common in very small or highly transactional teams, while enterprise teams add accelerators and gates.
Should a small sales team use accelerators?
Usually not. With five or fewer reps you rarely have the deal volume for accelerator maths to pay off, and the added complexity increases the chance of a calculation error. A simple flat or single-tier plan paid monthly is easier to run and easier for reps to trust.
How does deal size variability affect commission structure?
When deal sizes vary widely — say £5k to £500k — a flat rate can hand an outsized, unbudgeted payout to whoever lands the largest deal, and expose you to a big clawback if that deal later shrinks. High variability pushes you toward tiered rates, a cap or decelerator on the top band, and paying on the value actually locked in rather than the signing-day headline.
Is commission taxed differently from salary in the UK?
No. HMRC treats sales commission as employment income, taxed through PAYE at the employee's normal income tax and National Insurance rates. It also attracts employer National Insurance at 15% on the amount above the secondary threshold, the same as other pay.
How often should commission be paid out?
Match payout frequency to your sales cycle and deal risk. Short, transactional cycles with uniform deals can pay monthly on booked revenue; long enterprise cycles or deals with opt-out and ramp clauses should split the payout across milestones and hold the balance until the contract value is firm.
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