The 1075L tax code tells your employer to treat £10,750 of your annual pay as tax-free before deducting Income Tax at source. That is £1,820 less than the standard Personal Allowance of £12,570, so HMRC has reduced your tax-free amount for a specific reason, usually a taxable workplace benefit, untaxed income such as the State Pension, or underpaid tax from an earlier year being collected through your wages.
What the Numbers and Letter Actually Mean
Every UK tax code has two parts. The number is your tax-free allowance with the final digit removed, so 1075 stands for £10,750 and the standard 1257 stands for £12,570. The letter tells payroll which set of rules to apply. The “L” confirms you qualify for the standard Personal Allowance structure, even though the figure attached to it has been adjusted downward.1GOV.UK. Tax Codes – What Your Tax Code Means
HMRC sends the code straight to your employer or pension provider through an electronic notice, and payroll applies it automatically to every payment from that point on.2GOV.UK. Tax Codes You don’t set it. You can, however, check it and challenge it.
Why HMRC Has Reduced Your Allowance by £1,820
The standard Personal Allowance has been frozen at £12,570 since the 2021/22 tax year, and the government has confirmed it will stay there until April 2031.3GOV.UK. Income Tax – Maintaining the Personal Allowance and the Basic Rate Limit So the default code for most employees is 1257L. If yours reads 1075L, HMRC has knocked £1,820 off your allowance for one of the following reasons.
Taxable workplace benefits. A company car, private medical insurance, or other perks provided by your employer have a cash value that HMRC treats as extra income. Rather than tax you separately, HMRC subtracts the value of the benefit from your Personal Allowance.4GOV.UK. Expenses and Benefits for Employers – Reporting and Paying A benefit valued at £1,820, or several smaller benefits adding up to that figure, brings your allowance down to exactly £10,750.
Underpaid tax from a previous year. If you owe HMRC a small balance from an earlier tax year, they often collect it by lowering your Personal Allowance rather than sending a bill. A £1,820 reduction collects £364 in tax at the basic 20% rate, spread evenly across the year.
Untaxed income like the State Pension. The State Pension is taxable but paid gross, with no tax deducted at source. If you draw a pension alongside employment income, HMRC often reduces the tax code on your wages so the tax due on the pension gets collected through payroll.
Your coding notice from HMRC, if you still have it, spells out exactly which deductions add up to the £1,820. If you don’t have the letter, you can pull the breakdown from your personal tax account online.
What 1075L Costs You Compared to 1257L
Your employer spreads the £10,750 across the year so deductions stay level rather than landing all at once. Divided across pay periods, that works out to roughly £895.83 tax-free each month, or about £206.73 tax-free each week.
On the standard 1257L code, the tax-free share would be closer to £1,047.50 a month. The gap is around £152 of monthly pay that now sits inside the taxable band. At the basic 20% rate, that is about £30 more tax a month, or roughly £364 across the full tax year, which matches the £1,820 reduction almost exactly. If your earnings fall in the 40% higher-rate band, the yearly cost roughly doubles.
None of this is a penalty. It is simply the mechanism HMRC uses to collect tax that would otherwise be due on a benefit, a pension, or an old underpayment. But if the reduction is based on something that no longer applies to you, you’re overpaying every payday until it gets fixed.
How to Check Whether 1075L Is Correct
The quickest check is your HMRC personal tax account on GOV.UK. Sign in, and you can see the current code, the income and benefit figures HMRC is working from, and an estimate of your tax for the year.5GOV.UK. Check Your Income Tax for the Current Year If you haven’t used the service before, you’ll need photo ID to verify your identity.
Two forms from your employer help you cross-check. Your P60, issued after each tax year ends, shows total pay and tax deducted for that year.6GOV.UK. Your P45, P60 and P11D Form – P60 If you receive taxable benefits, your employer files a P11D listing the cash value of each one.4GOV.UK. Expenses and Benefits for Employers – Reporting and Paying Compare the total on the P11D against the £1,820 reduction. If the numbers don’t line up, or if a benefit has ended, the code is likely out of date.
A note on the suffix: if your code appears as 1075L W1, 1075L M1, or 1075L X, your employer is calculating tax on each pay period in isolation rather than cumulatively across the year.7GOV.UK. PAYE Manual – PAYE11090 That is usually a temporary arrangement, common after a job change, and it should switch back to a cumulative basis once HMRC has your full details.
How to Get 1075L Changed
If the code is wrong, you can report the change through your personal tax account. Common updates include ending a company benefit, changing jobs, or flagging income HMRC hasn’t recorded. If you’d rather speak to someone, HMRC’s Income Tax helpline is 0300 200 3300, open Monday to Friday, 8am to 6pm.8GOV.UK. Income Tax – Enquiries
Once HMRC processes the change, they send a revised coding notice to your employer electronically, and payroll applies it from the next available pay run. If you’ve been overpaying, the cumulative method usually rebalances your deductions in the following pay periods, so a refund shows up in your net pay rather than as a separate cheque. For larger corrections, or ones that reach back into earlier tax years, HMRC issues repayment separately.
It is worth acting sooner rather than later. HMRC’s figures depend partly on employer data and partly on estimates carried forward from previous years, and estimates go stale. A code that was accurate when it was issued can drift out of date within months, and every payday on the wrong code is money you either owe or are owed.