The 810L tax code is an outdated HMRC code from the 2012–13 tax year that gave a tax-free personal allowance of around £8,100.1GOV.UK. Understanding Your Employees’ Tax Codes: Overview The current standard code is 1257L, reflecting today’s £12,570 personal allowance. If 810L is showing on a recent payslip, it is almost certainly wrong, and you are paying more tax than you should on every payment you receive.
What the 810L Code Meant
UK tax codes pair a number with a letter. Payroll software multiplies the number by 10 to work out your annual tax-free income.2GOV.UK. Understanding Your Employees’ Tax Codes: What the Numbers Mean For 810L, that gave £8,100 of tax-free pay, which matched the standard personal allowance in place for 2012–13. The “L” suffix meant the taxpayer qualified for the basic personal allowance with no special adjustments.3GOV.UK. Tax Codes: What Your Tax Code Means
The code applied to the same broad group of taxpayers that 1257L covers today: someone with one job, no company benefits such as a car or private health insurance, and no significant untaxed income reducing their allowance. Some older guidance links 810L to people “under 65” because of the age-related personal allowances that existed at the time. Those age-related allowances were abolished entirely from 2016–17, once the basic personal allowance had overtaken them.4House of Commons Library. Age-Related Personal Allowance
Why 810L on a Current Payslip Is a Problem
Two things can be happening if you are looking at 810L.
The first, and harmless, possibility is that the document is old. P60s, archived payslips, and tax correspondence from around 2012–13 will legitimately show 810L because the code was correct at the time. Nothing needs doing.
The second is that a current payroll record has the wrong code loaded. This can happen after a data migration, when an employer imports outdated records into a new payroll system, or when HMRC’s records for you have become out of date. The consequence is straightforward: your tax-free allowance is being understated by £4,470 compared with the current £12,570 figure. At the 20% basic rate, that costs you around £894 in overpaid tax across a full year. At the 40% higher rate, the overpayment is closer to £1,790. Every payslip carries a share of that error until the code is fixed.
How to Get an Incorrect Tax Code Fixed
Start by comparing the code on your payslip against the code HMRC holds for you. Both should also match your most recent P60, the annual summary your employer provides after 5 April.5GOV.UK. Your P45, P60 and P11D Form: P60 Log in to your personal tax account on GOV.UK and open the “Check your Income Tax” service. If the code HMRC shows there is 1257L (or another current code) but your payslip still says 810L, the problem is on your employer’s side, and their payroll team can often correct it directly once you flag it.
If HMRC itself is showing 810L, you can update your details through the same online service. It lets you correct income estimates, report changes in employment or benefits, and tell HMRC about anything else that affects your code.6GOV.UK. Check Your Income Tax for the Current Year HMRC then issues a new code electronically to your employer.
To speak to someone instead, the Income Tax helpline is 0300 200 3300, open Monday to Friday, 8am to 6pm, and closed on bank holidays.7GOV.UK. Income Tax: Enquiries Have your National Insurance number and your employer’s PAYE reference (printed on your payslip) to hand.
Once HMRC has processed the change, you will receive a P2 coding notice showing the new code and how it was calculated. Your next payslip should reflect it.
Getting Back the Tax You Have Already Overpaid
Fixing the code stops the bleeding, but it does not automatically return money already lost. After each tax year ends on 5 April, HMRC reviews PAYE records and sends a P800 tax calculation letter to anyone who paid too much or too little. These letters are issued between June and March of the following year, so a wait is possible before HMRC spots an error you have not raised yourself.8GOV.UK. Tax Overpayments and Underpayments
If the P800 confirms an overpayment, you can claim the refund online through your personal tax account. HMRC pays it to your bank account or by cheque. People in Self Assessment do not receive P800 letters; any overpayment is worked out through their Self Assessment return instead.8GOV.UK. Tax Overpayments and Underpayments
Raising the issue with HMRC directly, rather than waiting for the year-end reconciliation, generally gets the refund back faster, especially where the wrong code has been running for months.
What Your Tax Code Should Be Now
Since the personal allowance reached £12,570 in 2021–22, the standard tax code for most employees has been 1257L.1GOV.UK. Understanding Your Employees’ Tax Codes: Overview The personal allowance is legislated to stay at £12,570 through the 2030–31 tax year, so 1257L will remain the default code until at least April 2031.9GOV.UK. Income Tax: Maintaining the Personal Allowance and the Basic Rate Limit
Not every current code is 1257L, and that is not automatically a sign of a problem. HMRC lowers the number when company benefits such as a car or private health insurance apply, when there is untaxed income from savings, rental property, or a second job, or when tax underpaid in a previous year is being collected through your code. The number goes up if you qualify for Blind Person’s Allowance, which adds £3,130 to the tax-free amount.10GOV.UK. Blind Person’s Allowance: What You’ll Get Marriage Allowance changes both the number and the suffix letter. Higher earners see their allowance shrink by £1 for every £2 earned above £100,000, and it disappears entirely at £125,140.11GOV.UK. Income Tax Rates and Personal Allowances
Scottish taxpayers see an “S” before their code number because Scotland sets its own income tax rates. Emergency codes carry a W1, M1, or X suffix, meaning your employer taxes each pay period on its own rather than cumulatively across the year, and these often appear after starting a new job without a P45.12GOV.UK. Tax Codes: Emergency Tax Codes HMRC usually replaces an emergency code within about 35 days of your start date.
If your current code is not 1257L and you are not sure why, the P2 coding notice HMRC sends explains every adjustment. Check it before assuming something is broken. But if the code is 810L, there is no legitimate adjustment behind it in 2026, and the sooner you get it changed, the less overpaid tax you will need to claim back later.