1222L Tax Code: What It Means, Why You Got It, How to Change It

The 1222L tax code gives you a tax-free personal allowance of £12,220 for the year, which is £350 less than the standard £12,570 most employees get. Your employer uses it to work out how much income tax to take from each payslip. The £350 reduction almost always reflects one of three things: a taxable benefit from your job, a small underpayment of tax from a previous year that HMRC is collecting gradually, or a bit of untaxed income HMRC knows about. If those reasons match your situation, the code is doing its job. If none of them do, it needs changing.

What the Number and Letter Actually Mean

A PAYE tax code has two parts. The number is your tax-free allowance with the last digit stripped off, so 1222 stands for £12,220 of pay you can receive before income tax starts. The letter L confirms you get the standard personal allowance, adjusted for something specific to you.¹ The standard allowance for 2025/26 and 2026/27 is £12,570, which produces the more familiar 1257L code.² The difference between 1257L and 1222L is £350 of allowance taken away.

Why HMRC Gave You 1222L

The £350 gap has to come from somewhere. Three situations account for most 1222L codes.

A Taxable Benefit From Work

If your employer provides something like private medical insurance or a company car, the benefit has a taxable value. Rather than sending you a separate bill, HMRC reduces your tax-free allowance so the right tax comes out of your wages through the year. When your benefits are worth £350 in total, 1257L becomes 1222L. Your employer reports the values to HMRC after each tax year on a P11D.³

Underpaid Tax From an Earlier Year

If you underpaid tax previously by a small sum, HMRC often collects it by shrinking this year’s allowance instead of asking for a lump payment. This is called coding out. It works for underpayments up to £2,999.99; anything at or above £3,000 has to be paid another way.⁴ A £350 coding-out gives you 1222L.

Untaxed Income HMRC Knows About

Small amounts of savings interest, rental income, or other untaxed earnings can be built into your code so the tax comes out of your pay automatically. If those amounts total £350, you land on 1222L.

What 1222L Costs You in Tax

Your employer subtracts £12,220 from your annual salary and taxes the rest. On a £30,000 salary, that means £17,780 is taxable. At the 20% basic rate, that’s £3,556 in income tax for the year.⁵

On 1257L, £17,430 would have been taxable, producing a tax bill of £3,486. So 1222L costs you £70 more tax across the year, which is 20% of the missing £350 of allowance. In monthly terms, that’s about £5.83 extra on each payslip.

Your allowance is spread evenly across pay periods. Monthly-paid staff get £1,018.33 tax-free per month. Weekly-paid staff get roughly £235 a week. Anything above that in a given pay period is taxed at 20%, or 40% once your annual income passes £50,270.⁵

Extra Letters You Might See With 1222L

Sometimes the code appears with extras that change how it operates.

W1, M1, or X

1222L W1, 1222L M1, or 1222L X means you’re on an emergency basis. W1 is weekly pay, M1 is monthly, X is irregular.⁶ Your employer taxes each pay period on its own rather than looking at your total earnings so far this year, which can leave you over- or under-taxed depending on how your pay varies. Emergency codes normally clear once HMRC has your full details. Check the next couple of payslips to make sure the W1, M1, or X drops off.

S1222L or C1222L

An S prefix means Scottish rates apply to the taxable portion; a C prefix means Welsh rates. The £12,220 allowance and the L work the same way.⁷

One boundary worth noting: if your taxable benefits ever wipe out your whole allowance, HMRC swaps L for K, and the code adds to your taxable income rather than reducing it. With only £350 of adjustment, 1222L is nowhere near that.¹

Check Whether 1222L Is Right for You

Sign in to your personal tax account and open “Check your Income Tax for the current year.” You’ll see your code, the allowances and deductions that built it, and an estimate of your tax for the year.⁸ Setting up sign-in details involves verifying your identity, usually with a passport or driving licence.⁹

Look at the £350 deduction on your record. If it matches a benefit you actually receive, an underpayment you know about, or untaxed income you’ve had, the code is correct. If nothing on the deductions list matches your life, get the code changed.

Have these to hand before you contact HMRC:

Your P60, the end-of-year summary of pay and tax deducted, issued after 5 April.
Your P45 if you’ve recently changed jobs.
Your P11D, listing the taxable value of any employer benefits.
Your employer’s PAYE reference, which is on your payslip.

Those documents give HMRC what they need to check the deduction and correct it.³

How to Get 1222L Changed

The fastest route is your personal tax account or the HMRC app. You can update income details, report changes to your benefits, and flag anything affecting the code.⁸ If you’d rather phone, call the HMRC income tax helpline with your National Insurance number and any relevant P60 or P11D details ready. Once HMRC processes the change, they issue an updated coding notice to your employer, and the new deduction should show up on your next payslip.

One limit: if you pay all your income tax through Self Assessment, the online “Check your Income Tax” service isn’t available to you. Code adjustments happen through your Self Assessment return instead.⁸

If the Code Was Wrong All Year

After 5 April, HMRC reconciles what you paid against what you owed. If the two don’t match, you’ll get a P800 tax calculation or a Simple Assessment letter.¹⁰

If you overpaid, you can claim the refund online by bank transfer, which usually arrives within five working days. A cheque requested online takes up to six weeks; a cheque HMRC sends automatically arrives within about 14 days of the letter. Refunds spanning multiple years come as a single payment.¹¹

If you underpaid, HMRC will usually collect it by adjusting your tax code for the following year, spreading the repayment across your pay. That coding-out route is standard for underpayments under £3,000. For larger sums, HMRC collects through Self Assessment or a direct payment.⁴ Where the underpayment was HMRC’s error, you won’t face penalties, though late payment interest of 7.75% applies to outstanding amounts as of January 2026.¹²

1
GOV.UK. What Your Tax Code Means
2
GOV.UK. Income Tax Personal Allowance and the Basic Rate Limit
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GOV.UK. Your P45, P60 and P11D Form
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HM Revenue & Customs. PAYE12070 – Coding: Adjustments to Collect Tax
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GOV.UK. Income Tax Rates and Personal Allowances
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GOV.UK. Emergency Tax Codes
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GOV.UK. Understanding Your Employees Tax Codes – What the Letters Mean
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GOV.UK. Check Your Income Tax for the Current Year
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GOV.UK. Personal Tax Account – Sign In or Set Up
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GOV.UK. Tax Overpayments and Underpayments
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GOV.UK. Tax Overpayments and Underpayments – If Youre Due a Refund
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HM Revenue & Customs. HMRC Interest Rates for Late and Early Payments