Can I deduct money from an employee's wages? The UK rules, plainly stated.

The short answer

Only in three situations. Either the law requires it (tax, National Insurance, student loan deductions), your employment contract expressly permits it, or the employee has given prior written consent.

That's it. Outside those three, deducting anything from an employee's wages is unlawful, regardless of how reasonable it feels, how much they owe you, or what they did.

If you've been doing it any other way, you have a problem that needs fixing before someone makes a tribunal claim.

What counts as wages?

More than you might think. Under the Employment Rights Act 1996, wages includes basic pay, overtime, contractual bonuses, commission, holiday pay and statutory sick pay. What it doesn't include is genuine expense payments, advances of wages, or redundancy pay.

The reason this matters: you can only make deductions from things that count as wages under the Act. Getting this wrong means the deduction is unlawful before you've even got to whether it's authorised.

The three lawful routes

Route one is statute. Tax, National Insurance and student loan repayments are required by law. You don't need a contract clause or consent. You just do it.

Route two is the contract. If your employment contract contains a clear, specific clause authorising deductions for a particular reason, and the employee had access to that clause before the event that triggers it, you can make that deduction. Vague clauses don't work. "The employer reserves the right to make deductions" isn't enough. It needs to specify what, when and how.

Route three is written consent. The employee agrees in writing to the specific deduction, for a specific reason, before the thing happens. An agreement signed after the event doesn't count.

Motives are irrelevant. A well-intentioned deduction made in error is still unlawful if it doesn't fit one of those three routes.

The one that catches most small employers: deducting for damage or losses

This is the most common unlawful deduction made by small employers, and the most easy to understand why. An employee breaks something, or makes a costly mistake, and it feels completely reasonable to ask them to cover it. Sometimes they even agree on the spot.

But that verbal agreement in the moment doesn't make it lawful. You need written consent given before the event, or a contract clause that covers it. "I'll take it out of your wages this month" followed by a nod is not sufficient authority.

There are two additional rules worth knowing here.

If a deduction would take the employee's pay below National Minimum Wage, it's unlawful regardless of what the contract says or whether they've consented, with very limited exceptions for things like tax and genuine overpayment recovery. From April 2026 the National Living Wage for workers aged 21 and over is £12.71 per hour. Anything that drops someone below that rate is a separate problem on top of the deduction issue.

If you employ retail workers, cash shortages and stock deficiencies are capped at 10% of gross pay per pay period. That cap applies even if the contract authorises more, and even if the employee agrees to more. It's a statutory ceiling and it applies to each pay period separately, not to the total debt.

Training costs: a separate category that needs its own clause

If you've paid for an employee's training and want to recover costs if they leave within a certain period, that's lawful. But only with a signed training cost repayment agreement, signed before the training starts, that specifies the total cost, the repayment period, and how the amount reduces over time.

A general clause in the contract saying "training costs may be recovered" is not enough. It needs to be a separate, specific agreement signed before the training happens. Without it, recovering training costs by deducting from wages is unlawful.

Overpayments: the exception that surprises people

Recovering a genuine accidental overpayment of wages is one of the few situations where you can make a deduction without a specific contract clause, because the law treats it as recovery of money that was never owed in the first place.

But you still need to tell the employee in writing, explain how and when you'll recover it, and give them reasonable notice. Taking it all in one go from the next payslip without warning is likely to produce a grievance even if the recovery itself is technically lawful. Agree a repayment plan, put it in writing, and keep a record.

What's changing: the tribunal clock is getting longer

Currently an employee has three months less one day from the date of the deduction to bring a tribunal claim. Under the Employment Rights Act 2025, that time limit is expected to increase to six months from October 2026.

That matters for two reasons. First, employees have more time to act, which means more potential claims. Second, the Supreme Court's 2023 decision in Agnew v PSNI changed the rules on what counts as a "series" of deductions. A gap of more than three months between deductions no longer automatically breaks the series. If you've been making the same type of unlawful deduction repeatedly, an employee can potentially claim for the whole run of them, not just the recent ones.

There's also the Fair Work Agency, live from April 2026, which has powers to proactively investigate employers for unlawful wage deductions without waiting for a formal employee complaint. It can inspect your records, issue notices and levy financial penalties. Holiday pay and NMW underpayments sit within its remit. Wage deductions that push someone below minimum wage could land in two places at once.

The practical checklist before you make any deduction

Does the law require this deduction? If yes, proceed. If no, move to the next question.

Does the employment contract have a clear, specific clause authorising this type of deduction? If yes, check the employee had that clause before the triggering event, then proceed.

Has the employee given prior written consent, specific to this deduction, before the event that triggers it? If yes, proceed.

Would the deduction take their pay below National Minimum Wage? If yes, stop.

Are they a retail worker and is this a cash shortage or stock deduction? If yes, cap it at 10% of gross pay this period.

If you can't answer yes to either of the first three questions, don't make the deduction. Deal with the issue through your disciplinary process instead.

What if you've already deducted unlawfully?

Pay it back. The sooner the better. An unlawful deduction that's corrected before a tribunal claim is filed puts you in a far better position than one that isn't. Most employees who find a deduction corrected promptly and without fuss don't escalate further.

If you're not sure whether a deduction you've already made was lawful, now is the time to check. If it wasn't, repay it, update the contract clause for the future, and don't wait for someone to raise a grievance to find out.

If a deduction is already being challenged, get advice before you respond. What you say in the first response to a grievance about wages often matters as much as what the contract says.

Last reviewed: August 2026. This article is general guidance, not legal advice. If you have a specific wage deduction question or a live dispute, get in touch.