What does the tax code
1152L mean?

A £1,050 deduction is a different order of thing from the small adjustments that produce codes a point or two below standard. It is large enough to be a specific, named item on your coding notice, and large enough that getting it wrong costs real money. On 1152L your tax-free pay for 2026/27 is £11,520, and you are paying about £210 a year more tax than someone on the standard code.

In most cases the culprit is a benefit your employer gives you that HMRC treats as income.

What a benefit in kind actually is

If your employer gives you something with a cash value instead of paying you more, HMRC generally taxes you as though you had received the cash. The benefit is valued, the value is reported, and the tax is collected by cutting your allowance by that value.

Benefits that land in this range include:

• Private medical insurance, which is the single most common cause of a four figure deduction for ordinary employees
• Gym or health club membership paid for by the employer
• A cheap or interest-free loan above the exempt threshold, where the benefit is the interest you did not pay
• Professional or personal subscriptions met by the employer that are not job related
• Living accommodation or other perks, though these usually produce much larger figures

Notice what is not on the list. Employer pension contributions are not a taxable benefit. Nor is a genuine reimbursement of a business expense you incurred. Nor are trivial benefits within the statutory exemption. A deduction appearing for any of these is worth challenging.

Worked example: 1152L on a £34,000 salary

An employee on £34,000 with private medical cover valued at £1,050.

1. Gross salary: £34,000
2. Subtract the 1152L allowance: £34,000 minus £11,520 = £22,480 of taxable income
3. All of it falls inside the basic rate band, so it is taxed at 20%
4. Income tax for the year: £4,496
5. Monthly tax-free pay: £11,520 divided by 12 = £960

On the standard 1257L code the same salary produces £21,430 taxable and £4,286 of tax. The benefit therefore costs £210 across the year, or £17.50 a month. Income tax only, National Insurance excluded, and an estimate to confirm with HMRC.

For a higher rate taxpayer the same £1,050 benefit costs £420. This is worth knowing before you accept a benefit: the question is not whether it is free, but whether it is worth its tax cost to you. Medical cover valued at £1,050 costs a basic rate taxpayer £210 and a higher rate taxpayer £420, which is still usually far less than buying equivalent cover personally.

The deduction is the value, not the tax

Say this back to yourself before ringing HMRC, because it is the most common misunderstanding on any coding notice.

£1,050 in the deduction column means £1,050 of extra income being taxed. It does not mean HMRC wants £1,050 from you. The cost is the tax on that amount at your marginal rate: £210 at 20%, £420 at 40%.

The distinction matters most when the benefit ended. If your medical cover stopped and the deduction is still there, you are losing £210 a year, not £1,050 a year. Both are worth recovering, but arriving at the right number makes the conversation shorter.

Why benefit deductions go stale

Employers report benefits after the fact, and HMRC projects forward. Those two facts between them explain nearly every wrong benefit deduction.

The benefit ended and the code did not. You left the scheme, or the employer stopped offering it, but the deduction rolls forward into the next year unchanged because nothing prompted a review.

The value changed. Insurance premiums move every year. A deduction based on last year's premium is close but not right, and the gaps accumulate.

You changed employer. The old employer's benefit can survive in your record and reduce your allowance against your new job, which gives you a deduction for something you no longer have from someone you no longer work for.

It is being collected twice. Where a benefit is payrolled by the employer and also deducted in your code, you pay the tax on it twice over. This is worth checking specifically if your payslip shows the benefit as a separate taxable line.

That last one is genuinely expensive and easy to miss, because both mechanisms look correct in isolation.

Your P11D is the document that settles the argument

Employers report taxable benefits to HMRC after the end of each tax year, and they have to give you a copy of what they reported. That copy is a P11D, and it is the single most useful piece of paper for anyone questioning a coding deduction.

It matters because your coding deduction is a forecast and your P11D is a fact. HMRC builds the deduction in your 2026/27 code from what your employer reported for an earlier year, adjusted for anything it has been told since. The P11D tells you what was actually provided and what it was actually valued at.

Three checks are worth doing when the two are side by side:

Does the value match? A deduction meaningfully above the P11D figure means HMRC is over collecting.

Is the benefit still listed at all? If the most recent P11D does not show it, the benefit has ended and the deduction should follow.

Has your employer started payrolling benefits instead? Employers can choose to run benefits through payroll, adding the value to your taxable pay each period. Where that has started, the benefit should come out of your code, because the tax is already being collected. A transition year is the most likely moment for both mechanisms to run at once.

If your employer payrolls benefits, you may not receive a P11D at all, and your payslip becomes the reference document instead. Either way, the principle holds: compare what is being collected against what was actually provided, rather than trying to judge the deduction on its own.

How to check and correct it

Sign in to your Personal Tax Account at gov.uk/personal-tax-account and open "Check your Income Tax". The breakdown behind your code names each deduction with a value in pounds, so you can see whether £1,050 is one item or several.

Compare it against the P11D your employer gives you, which is the statement of benefits they reported. If the P11D and the coding deduction disagree, one of them is wrong and the P11D is usually the better evidence.

If the benefit has ended, report the change in the same service or call the Income Tax helpline on 0300 200 3300. A corrected code applies cumulatively, so an overpayment for the current year comes back through your next payslip.

For years that have already closed, the code cannot help and a separate claim is needed. The general window is four years, and our guide to reclaiming overpaid tax covers how to make one. Where deductions grow large enough to wipe out the allowance entirely, the code changes character and becomes a K code.

Our free tax code checker will estimate what your code should be with and without the benefit, so you can see the gap before contacting HMRC. It gives an estimate rather than advice.

People also ask

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Related tax codes: 1151L tax code | 1159L tax code | 1160L tax code | 1257L tax code | K tax code

HMRC: Tax on company benefits