Tax code 1126L means your employer will let you earn £11,260 before deducting income tax, and then tax the rest of your pay through PAYE. That’s £1,310 below the standard £12,570 Personal Allowance for 2026/27, so HMRC has reduced your tax-free amount for a specific reason. Finding that reason is what tells you whether the code is correct or whether you’re paying too much.
What the 1126 Gives You
The number in a PAYE code is your annual tax-free allowance divided by ten. Multiply 1,126 by ten and you get £11,260 for the year, which your employer spreads across pay periods: roughly £938 a month, or about £216 a week, comes to you free of income tax. Everything above that is taxed at the usual PAYE rates.
The standard Personal Allowance has been frozen at £12,570 since April 2021 and is set to stay there through at least 2027/28.1GOV.UK. Income Tax Rates and Allowances for Current and Previous Tax Years Most employees have 1257L on their payslip, which reflects the full amount. Your code of 1126L is £1,310 lower, which means HMRC has calculated deductions of exactly that value against your allowance.
Why Your Allowance Has Been Reduced by £1,310
HMRC lowers your tax code whenever you have income or benefits that haven’t already been taxed at source. Rather than sending a separate bill, they shrink your tax-free allowance so the correct amount comes out of each payslip automatically. A £1,310 gap is a modest adjustment, and a few everyday situations produce it.
A Company Benefit You Receive Through Work
If your employer provides a company car, private medical insurance, an interest-free loan, or similar perks, the taxable value of those benefits is deducted from your Personal Allowance. Company cars are the most common cause. The taxable amount depends on the car’s list price, its CO2 emissions, and whether your employer also pays for fuel used on personal journeys.2GOV.UK. Tax on Company Cars A benefit-in-kind value of £1,310 could reflect a low-emission vehicle, a small amount of medical cover, or a partial year of car use.
Underpaid Tax From an Earlier Year
Where HMRC finds you underpaid tax in a previous year and the amount is under £3,000, they usually collect it by trimming your current tax code rather than asking for a lump sum. The deduction is spread evenly across 12 months from the start of the tax year in which they collect it.3GOV.UK. Tax Overpayments and Underpayments – If You Owe Tax A £1,310 reduction is consistent with HMRC recovering roughly that much in unpaid tax through your wages this year. Larger debts of £3,000 or more are handled separately.
Untaxed Income Like State Pension or Savings Interest
State Pension is taxable but is paid without any tax taken off. HMRC handles that by reducing the code on your employment income so the right total is collected across the year. Savings interest above your Personal Savings Allowance and some other untaxed income can be treated the same way.4GOV.UK. Tax Codes – Why Your Tax Code Might Change If you have any of these alongside your job, your code drops to match.
A Missing Expense Allowance
Some job-related expenses work the other way and should push your code up, not down. If you’re entitled to flat-rate expenses for uniforms, work clothing, or tools, that amount is added to your Personal Allowance.5GOV.UK. Check How Much Tax Relief You Can Claim for Uniforms, Work Clothing and Tools If you qualify but your code doesn’t reflect it, your allowance is lower than it should be.
What the L on the End Means
The L suffix confirms you’re entitled to the standard Personal Allowance rules, with no special adjustments like a Marriage Allowance transfer.6GOV.UK. What Your Tax Code Means It doesn’t mean you’re getting the full £12,570. It just tells your employer to apply the number in front of it as your tax-free amount. On 1126L, that £11,260 already has the deductions built in.
How to Check Whether 1126L Is Right for You
The quickest way is the “Check your Income Tax” service on gov.uk, which you can also use through the HMRC app.7GOV.UK. Check Your Income Tax for the Current Year Sign in and you’ll see a breakdown showing your Personal Allowance and each item HMRC has deducted from it. That’s where a £1,310 reduction becomes visible as one or more specific entries.
Have a few things to hand before you look. Your most recent payslip shows the current code and year-to-date figures. Your P60 covers the tax year ending 5 April.8GOV.UK. Your P45, P60 and P11D Form If you changed jobs recently, your P45 tells your new employer what you’ve already earned and paid. It also helps to have details of any company benefits and a realistic estimate of your total income for the year, including any pension or savings interest.
Read the HMRC breakdown line by line. Common problems: a company benefit listed that you no longer receive, a debt shown that you’ve already cleared, or an income estimate higher than you’ll actually earn. Any of these means you’re overpaying tax and the code needs to change.
How to Get 1126L Changed
You can update your information directly through the same online service. Correct income estimates, add or remove benefits, or flag a job you’ve left. HMRC reviews the change and, if it accepts one is needed, issues a new tax code and tells both you and your employer within 15 working days.9GOV.UK. Tax Codes – If You Think Your Tax Code Is Wrong
To do it by phone, call the HMRC Income Tax helpline on 0300 200 3300, Monday to Friday, 8am to 6pm.10GOV.UK. Income Tax – Enquiries You’ll need your National Insurance number and the details of what’s changed.
Once HMRC updates the code, they send a P2 Notice of Coding. It lists every element of the new code: your allowance, each deduction, and the tax-free total that results.11GOV.UK. PAYE Manual – P2 Notice of Coding Check it carefully; this is the document where any remaining error becomes obvious, because you can see each figure HMRC used.
Getting Back Tax You’ve Already Overpaid
If you’ve been on the wrong code and paid too much, HMRC often spots this after the tax year ends and sends a P800 calculation. Where a refund is due, you can claim it online and receive the money within five working days, or wait about six weeks for a cheque.12GOV.UK. Tax Overpayments and Underpayments – If You Are Due a Refund
There’s a deadline. You have four years after the end of the relevant tax year to claim overpaid income tax back.13GOV.UK. Self Assessment Claims Manual – SACM12155 – Overpayment Relief – Time Limits for Making a Claim Miss it and the refund is lost. If you think the code has been wrong for several years, check each year separately through your Personal Tax Account, because each one has its own four-year window running down.