Commission Money in UK Employment Contracts and Sales Incentive Schemes

If you’re running a sales-led business (or even just hiring your first sales hire), commission money can feel like a win-win: your team is motivated, and you only pay more when the business earns more.

But commission is also one of the most common sources of disputes with staff - usually because the rules weren’t clearly set out from day one, or the business changed the scheme mid-stream without following the right steps.

In this guide, we’ll break down what commission money actually is, how it typically works in UK employment arrangements, and how you can build a sales incentive scheme that’s commercially effective and legally safer.

What Is Commission Money (And Why Do Businesses Use It)?

Commission money is variable pay linked to performance - most commonly a percentage or fixed amount paid when a salesperson (or other revenue-driving staff member) achieves a target outcome.

In practice, commission money might be tied to:

• Sales revenue (eg a percentage of the value of contracts sold)
• Profit (eg commission based on gross margin rather than top-line revenue)
• New customers (eg a fixed amount per new account opened)
• Renewals or upsells (eg commission on subscription renewals or upgrades)
• Team targets (eg pool-based commission where the team shares a pot)

Businesses use commission structures because they can:

• incentivise staff to sell more (without increasing fixed payroll costs)
• align pay with business performance and cashflow
• help attract ambitious sales talent (especially in competitive markets)
• reward measurable outcomes rather than “time spent”

That said, the legal risk usually isn’t the concept of commission - it’s the detail. If you’re paying commission money, you’ll want to be very clear on what triggers payment, when it’s earned, and what happens in the common grey areas (refunds, cancellations, leavers, disputes, bad debt).

How Commission Money Is Usually Documented In The UK

For small businesses, the most important point is this: commission money should be documented in writing, and it should be consistent with the rest of the employee’s terms.

Commission terms might sit in:

• the employment contract (often as a core term), and/or
• a separate commission plan or policy that’s incorporated by reference, and/or
• a specific side letter or schedule that can be updated more easily.

Whatever format you choose, it needs to be clear what is contractually binding and what is discretionary. If the wording is unclear, you can end up with an expensive argument about whether commission was “promised” and legally owed.

When you’re putting your arrangements in place, it’s usually best to start with a properly drafted Employment Contract and then build the commission scheme carefully around it.

Commission As A Contractual Right vs Discretionary Bonus

Many businesses accidentally create legal obligations by using loose language like:

• “You will receive 10% commission…”
• “Commission will be paid on all deals…”
• “Commission is payable monthly…”

If you say “will”, it often reads as a contractual entitlement - which means you may not be able to vary it easily later, and failure to pay can trigger claims (including unlawful deduction from wages).

If you truly need flexibility, you may want to structure the arrangement as discretionary - but be careful: even discretionary schemes can become expected and implied over time if they’re applied consistently without clear disclaimers.

Using A Separate Commission Agreement

If commission money is central to the role (which it often is), it can be smart to use a dedicated document that sets out the scheme in detail. For some businesses, a tailored Employee Commission Agreement helps keep the scheme precise while keeping the core employment contract cleaner.

This is especially helpful if you:

• have multiple commission models across teams
• expect to update commission structures as you grow
• want clear “edge case” rules (refunds, cancellations, bad debt, leavers)

Key Terms Your Commission Scheme Should Cover (So It Works In Real Life)

A commission scheme usually looks simple until you try to apply it to real transactions and real people. To reduce misunderstandings, your documentation should answer the questions your team will inevitably ask later.

1) What Counts As A “Sale” (And When Is It Earned)?

One of the biggest triggers for commission disputes is timing. You’ll want to define clearly when commission is “earned”, for example:

• when the customer signs the contract
• when the customer pays (in full or in part)
• after the cooling-off period ends (where applicable)
• once delivery is completed (where relevant)
• once the business has received cleared funds

There’s no one “right” answer - it depends on your cashflow, your sales cycle, and how much post-sale work is required. The key is choosing a rule that matches your operations and then drafting it clearly.

2) How Is Commission Calculated?

Be specific about the calculation basis. Common options include:

• percentage of revenue (straightforward, but may ignore profitability)
• percentage of gross profit (better margin protection, but harder to explain)
• tiered rates (eg 5% up to £50k, 8% above £50k)
• fixed amounts (eg £250 per new customer)

You’ll also want to define whether commission is calculated:

• excluding VAT
• after discounts
• after refunds and credits
• net of payment processing fees (if relevant)

3) When Will Commission Be Paid?

Your commission scheme should state the payment cycle (eg monthly, quarterly), how it’s processed through payroll, and whether it is paid in arrears.

Be careful here: if commission is regularly paid late without agreement, it can damage trust and increase legal risk. It’s worth having a clear payroll process that aligns with your wage payment obligations and payslip requirements, and it’s wise to understand what can happen if you pay employees late.

4) What Happens With Refunds, Cancellations, Or Bad Debt?

If your business sells products or services that may be cancelled or refunded, you should be very explicit about whether commission is:

• reversed (“clawed back”) if the customer cancels
• adjusted if a refund is processed
• only payable once the customer pays and stays beyond a defined point

This isn’t about being “harsh” - it’s about matching commission payments to genuine realised revenue and avoiding a situation where the business pays commission on money it never ultimately receives.

5) Leavers: What If Someone Resigns Or Is Dismissed Mid-Period?

This is another common dispute area. If an employee leaves, you’ll want your scheme to define what happens to:

• commission on deals signed but not yet paid
• commission accrued during the notice period
• commission where the salesperson introduced the deal but someone else closed it

If you don’t spell this out, you can end up with arguments about whether commission was already earned (and therefore must be paid), or whether it was conditional on continued employment at the payment date.

You’ll also want your exit paperwork to be consistent with your contractual position - including any approach you take in a termination letter.

Legal And Compliance Issues To Watch When Paying Commission Money

Commission schemes aren’t just “commercial” documents - they’re part of your employment arrangements, and they can trigger several legal considerations.

National Minimum Wage (NMW) And Commission

If you pay commission on top of a base salary, you’ll usually be fine - but issues can arise where commission is the main source of pay.

If you’re using low basic pay (or “commission-only” approaches), you need to be very careful that the worker receives at least the National Minimum Wage (or National Living Wage) for the relevant pay reference period.

This is one reason commission-only models should be approached cautiously and structured properly. If you’re considering that route, it helps to think through your role design carefully, including how to structure a commission-only sales position.

Holiday Pay, Sick Pay, And Other “Normal Pay” Questions

In some situations, commission and other variable pay can affect holiday pay calculations (particularly where commission is regularly earned and forms part of “normal remuneration”).

This is a nuanced area, and it depends on working patterns, the nature of the commission, and how consistently it’s earned. If commission is a key part of remuneration, it’s worth getting advice on how it interacts with statutory rights, so you don’t accidentally underpay holiday.

Unlawful Deduction From Wages And Clawbacks

If your scheme includes clawbacks (eg reversing commission when refunds occur), you’ll want to ensure the documentation is very clear and enforceable.

Without a contractual right to make deductions, the business can be exposed to claims for unlawful deduction from wages. Practically, that means you shouldn’t assume you can just “net off” amounts from payroll unless the paperwork supports it.

Varying Commission Schemes (And Avoiding Breach Of Contract)

Many small businesses need to adjust commission structures as pricing changes, margins tighten, or the sales process evolves. The legal risk is changing commission terms without the right mechanism or consent.

As a rule, if commission is contractual, changing it can require agreement - and if you impose changes unilaterally, you may be creating a breach of contract risk.

A well-designed scheme often includes a right to review or amend, but it needs to be drafted carefully and exercised fairly. In practice, you should:

• give reasonable notice of changes
• explain the commercial rationale
• document the updated terms clearly
• apply changes consistently (to reduce discrimination risk)

Clear Written Communications (Including Emails)

Commission disputes often come down to “what was promised” - and that can include casual messages.

Be mindful that written communications can be relied upon later, and in some cases emails can be legally binding (or at least persuasive evidence of an agreement). Keeping a single source of truth for the scheme and avoiding off-the-cuff promises can save you a lot of stress.

How To Build A Commission Scheme That Motivates Sales (Without Creating Unnecessary Risk)

A good commission scheme should do two things at once:

• drive the behaviours that grow your business, and
• reduce ambiguity so you’re not dealing with constant “but I thought…” conversations.

Start With The Behaviours You Want To Reward

Before choosing a commission rate, get clear on the outcomes you want:

• Do you want more new customers?
• Do you want bigger deals or better margins?
• Do you want to reward renewals and reduce churn?
• Do you want to encourage team selling rather than internal competition?

Once you’re clear on this, you can structure commission around measurable metrics that match those goals.

Keep It Understandable

Complex schemes can look clever on paper but fail in the real world if staff can’t easily predict what they’ll earn.

A practical rule: if a salesperson can’t calculate a rough commission estimate themselves, you may see more disputes, more admin time, and less motivational impact.

Be Consistent With Performance Management

If commission is tied to performance, you’ll want your broader performance management approach to be aligned too - including what happens if targets aren’t met.

For example, if performance issues arise, a compliant process (rather than ad hoc pressure) reduces risk and helps you manage fairly. Some businesses formalise this with Performance Improvement Plans where appropriate.

Make Sure Payroll And Reporting Are Bulletproof

Commission tends to create friction when reporting is unclear. To keep things smooth, you’ll want:

• a clear CRM / tracking process (and agreement on what “counts”)
• a commission statement process (so staff can see how it’s calculated)
• internal sign-off rules (especially for discounts and special deals)
• a documented dispute process (who reviews and how quickly)

This isn’t just about preventing complaints - it’s about protecting your leadership time. A scheme that creates weekly confusion is rarely worth it.

Common Commission Money Mistakes Small Businesses Make (And How To Avoid Them)

Here are a few mistakes we see regularly when businesses introduce commission schemes quickly (often during a growth phase).

1) Relying On A Template That Doesn’t Match Your Sales Process

Commission arrangements are highly business-specific. A generic template may not deal with the realities of your:

• refund policy
• pipeline and sales cycle
• team selling model
• industry regulation (where applicable)

It’s usually cheaper to get it right upfront than to fix a dispute later.

2) Not Defining “Discretion” Clearly

Some businesses say commission is discretionary, but then pay it consistently for years. Over time, staff may treat it as guaranteed, and it becomes harder to change without blowback.

If you need discretion, you must draft the clause carefully, apply it consistently, and document decisions properly.

3) Creating Unclear Rules For Discounts And Special Deals

If your sales team can discount to close deals, decide upfront:

• Is commission based on list price or discounted price?
• Does commission reduce when margin drops?
• Do discounts need manager approval for commission to apply?

These small details can make a big difference to profit - and to whether staff feel the scheme is fair.

4) Promising Commission During Recruitment Without Documenting It

Commission is often used as a recruitment hook, but you should ensure offers are backed up by written terms that match what was discussed.

If your offer process is informal, you can end up in a situation where the employee believes a higher commission rate was agreed than what appears in the final contract.

Key Takeaways

• Commission money is variable pay tied to performance, but it needs clear rules so it motivates staff without creating avoidable disputes.
• Document commission properly - ideally through a solid Employment Contract plus a detailed commission plan or agreement that covers real-world scenarios.
• Your scheme should clearly define when commission is earned, how it’s calculated, and when it’s paid.
• Always address common grey areas upfront: refunds, cancellations, bad debt, notice periods, and what happens when someone leaves.
• Watch key compliance issues, including minimum wage risks (especially for commission-only roles) and the legal limits on clawbacks and deductions.
• If you need to change commission structures, do it carefully - sudden unilateral changes can create breach of contract and employee relations risks.

This article is for general information only and isn’t legal advice. If you’d like advice on your specific situation, get in touch with a qualified adviser.

If you’d like help drafting or reviewing commission terms so your incentive scheme is clear, enforceable, and suited to how your business actually sells, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.