The 1153L tax code gave you a tax-free personal allowance of £11,530 a year, and it was used mainly during the 2017/18 UK tax year. The standard personal allowance that year was £11,500, so a code of 1150L was the default. The extra £30 that produced 1153L came from a small personal adjustment on top, usually flat-rate job expenses or a minor correction carried over from a previous year. If you’re looking at 1153L on an old payslip or P60, the code was almost certainly correct for that period.
What the Number and Letter Mean
A PAYE tax code has two parts. The number is your tax-free allowance with the last digit removed, so 1153 stands for £11,530 of income you can earn in the year before income tax applies. Your employer spreads that allowance evenly across your pay periods. On monthly pay, that works out to roughly £960 of each month’s wages coming to you tax-free, with income tax only charged on the rest.
The L at the end signals that you qualify for the standard personal allowance with no special rules attached, such as a Marriage Allowance transfer or an income above £100,000. It’s the most common suffix in PAYE and simply means your situation is straightforward.
Why the Code Was 1153L and Not 1150L
The base personal allowance for 2017/18 was £11,500, which produces a code of 1150L on its own.1GOV.UK. Income Tax Personal Allowance and Basic Rate Limit for 2017 to 2018 The extra £30 that turned it into 1153L was added by HMRC for reasons specific to you. Two causes account for most of these small uplifts.
The first is flat-rate job expenses. HMRC lets employees in certain trades and professions claim a fixed annual deduction for costs such as laundering a uniform, maintaining tools, or paying professional subscriptions.2GOV.UK. Check How Much Tax Relief You Can Claim for Uniforms, Work Clothing and Tools The amounts are set by occupation, not by what you actually spent. A £30 flat-rate entitlement added to the £11,500 standard allowance gives you £11,530 of tax-free income, and a code of 1153L.
The second is a small correction from a previous tax year. If you had paid slightly too much tax the year before, HMRC sometimes returned the balance by increasing your allowance the following year rather than issuing a separate refund. A £30 rebalancing produces the same result. Between these two mechanisms, plenty of people ended up with codes sitting just a few pounds above the standard figure.
How 1153L Affected Your Take-Home Pay
With 1153L, your first £11,530 of annual earnings was free of income tax. Anything above that was taxed at the normal rates for the year. Because the L suffix uses the cumulative method, your employer looked at your year-to-date earnings each pay period and applied the allowance proportionally, which evens out fluctuations across the year rather than treating each payslip in isolation.
If you had taxable workplace benefits during 2017/18, such as private medical insurance or a company car, those would normally have reduced the number in your code rather than left it slightly above the standard. A code of 1153L therefore suggests you weren’t receiving benefits large enough to eat into your allowance, and that any adjustment on your record was working in your favour.
Checking a 1153L Code on Old Payslips
To confirm the code was right for you, work through the arithmetic. Start with the £11,500 personal allowance for 2017/18. Add any flat-rate expense entitlement for your occupation. Add any small underpayment refund HMRC was returning through your allowance. Then subtract the taxable value of any employer benefits. Drop the last digit of the result and you should land on the number in your code.
If the figures line up at 1153, nothing more needs doing. HMRC’s coding notices from that year, if you kept them, spell out each adjustment line by line and are the clearest evidence of what the £30 uplift represented. Your P60 for the year ending 5 April 2018 will also show the code your employer used.
Errors from that far back are worth pursuing only if the amount involved justifies it. HMRC will still look at claims for earlier years within the normal time limits, and refunds due after the end of a tax year are usually issued through a P800 calculation letter.3GOV.UK. Tax Overpayments and Underpayments – If You’re Due a Refund For a £30 discrepancy, the tax at stake is at most £6 at the basic rate, so most people leave it alone.
What Replaced 1153L
1153L belongs to 2017/18 and has not been the standard code for any year since. The personal allowance rose in stages after that and was then frozen at £12,570 from April 2021, giving a standard code of 1257L.4GOV.UK. Understanding Your Employees’ Tax Codes That freeze is expected to continue until at least April 2028, so 1257L is likely to remain the default code for several more years.
p>If your current code still shows 1153L on a recent payslip, that’s a problem worth acting on quickly, because your employer would be taxing you on income above £11,530 rather than the current £12,570 threshold. You can check your live code and report a change through the “Check your Income Tax” online service on GOV.UK or the HMRC app.5GOV.UK. Check Your Income Tax for the Current Year Once HMRC updates the code, your employer applies it within 15 working days, and any overpayment collected in the meantime is refunded through your pay.6GOV.UK. Tax Codes – If You Think Your Tax Code Is Wrong