750L Tax Code: What It Means, Why You Have It, and How to Fix It

A 750L tax code means your employer has been told to treat the first £7,500 of your pay this year as tax-free, instead of the standard £12,570 that comes with the usual 1257L code.¹ HMRC has knocked roughly £5,070 off your Personal Allowance, almost always because of taxable benefits from your employer, untaxed income from somewhere else, or tax owed from a previous year. The code is not automatically wrong, but the size of the reduction makes it worth checking.

What the Number and Letter Actually Mean

Every PAYE tax code has two parts. The number is your annual tax-free allowance with the final digit dropped, so 750 stands for £7,500 and 1257 for £12,570. HMRC works it out by taking the standard Personal Allowance and subtracting adjustments for things like company benefits, untaxed income, or the High Income Child Benefit Charge.²

The letter L simply means you’re entitled to the standard Personal Allowance. It doesn’t tell you anything special about your situation beyond that.² The story is in the number.

Why HMRC Would Give You a 750L Code

The default code for 2025-26 and 2026-27 is 1257L, matching the full £12,570 Personal Allowance that has been frozen since April 2021 and is scheduled to stay frozen until at least April 2028.¹³ A 750L code means HMRC has applied about £5,070 in deductions. The usual reasons:

Taxable employment benefits. A company car, private medical insurance, or other benefits in kind reduce your code. HMRC’s own example shows a £1,570 medical insurance benefit dropping a code from 1257L to 1100L, so a combination of benefits worth roughly £5,070 would land you at 750L.²
Untaxed income from a second job, rental property, or savings interest that HMRC collects through your main employment code.
Underpaid tax from an earlier year, spread across the current year by lowering your allowance.
The High Income Child Benefit Charge, if your income exceeds £60,000 and you or your partner claims Child Benefit.

Any of those can be legitimate. What matters is whether the figures behind each one are still accurate. A company car you no longer drive or a benefit that ended last year can quietly keep costing you tax every payday.

What 750L Costs You Compared With 1257L

With a 750L code, your employer treats the first £7,500 as tax-free and everything above that runs through the standard income tax bands. For 2025-26 and 2026-27 in England, Wales, and Northern Ireland:⁴

Basic rate (20%): taxable income from £12,571 to £50,270
Higher rate (40%): £50,271 to £125,140
Additional rate (45%): over £125,140

A worked example makes the difference concrete. On a £35,000 salary, the standard 1257L code leaves £22,430 taxable at 20%, giving about £4,486 in income tax for the year. Under 750L, £27,500 is taxable at 20%, giving about £5,500. That’s roughly £1,014 more, spread across your payslips. If the code is right, that extra tax is covering what you owe on benefits or untaxed income. If it’s wrong, you’re overpaying every month.

National Insurance is calculated separately and isn’t affected by your tax code. For 2025-26, most employees pay 8% on weekly earnings between £242 and £967, and 2% above that.⁵

Scotland and the S Prefix

If you live in Scotland, your code will usually start with S (for example, S750L). Scottish income tax runs to six bands with rates from 19% at the starter level up to 48% at the top; for 2026-27 the higher rate is 42% on taxable income between £43,663 and £75,000, and an advanced rate of 45% applies from £75,001 to £125,140.⁶ The Personal Allowance itself is UK-wide, so 750L still means £7,500 tax-free wherever you live.

If You Earn Over £100,000

Your Personal Allowance shrinks by £1 for every £2 of adjusted net income above £100,000, and disappears entirely at £125,140.⁴ Someone on £110,000 loses £5,000 of allowance, dropping to £7,570 and a code near 757L. A 750L code at that income level can reflect the taper plus a small further adjustment, and is a correct reduction rather than a mistake.

How to Check Whether Your 750L Code Is Right

Pull together three documents. Your latest payslip shows the code your employer is currently using. Your P60 summarises pay and tax for the previous tax year and must reach you by 31 May. If you changed jobs during the year, your P45 from the previous employer records your leaving pay and code.⁷

Then do the arithmetic. Start with £12,570. Subtract the taxable value of any employer benefits you receive, such as a company car or medical insurance. Subtract any untaxed income or prior-year underpayment HMRC has told you about.⁸ Drop the last digit of the result. It should match the number in your code. If it doesn’t, or if you’re still being deducted for a benefit that ended, the code needs updating.

Your HMRC Personal Tax Account gives you the full breakdown online, listing every item that makes up your code, including benefits, estimated untaxed income, and any underpayment being collected.⁹ Any line that looks wrong is a reason to act.

How to Get the Code Changed

You can’t change a tax code yourself, but you can tell HMRC what needs correcting. The fastest route is the Check Your Income Tax online service, where you can update details of jobs, pensions, and benefits through your Personal Tax Account or the HMRC app.¹⁰

By phone, the Income Tax helpline is 0300 200 3300, Monday to Friday 8am to 6pm, or +44 135 535 9022 from outside the UK.¹¹ Have your National Insurance number and a recent payslip in front of you.

Once HMRC updates the code, you’ll receive a P2 Notice of Coding explaining the new code and its make-up.¹² HMRC also sends your employer a tax code notice so payroll updates automatically; you don’t need to pass anything on yourself.¹³

Getting Back Any Tax You Overpaid

If the code was wrong and you paid too much within the current tax year, HMRC will normally refund you through payroll once the corrected code lands. For monthly-paid employees the refund usually shows up in the next pay packet or the one after; for weekly-paid employees, typically by the third payday after the change.¹⁴

If the overpayment covers an earlier tax year, it takes longer. After 5 April, HMRC gathers final figures from employers and pension providers, compares what you paid against what you owed, and writes to you with the result. Refunds come either through an adjusted code for the following year or by direct payment.¹⁴ The same reconciliation works the other way: if HMRC finds you underpaid, they’ll usually collect the difference by lowering next year’s code. Checking now avoids finding out about it in a letter later.

1
GOV.UK. Understanding Your Employees’ Tax Codes
2
GOV.UK. Tax Codes – What Your Tax Code Means
3
House of Commons Library. Direct Taxes: Rates and Allowances
4
GOV.UK. Income Tax Rates and Personal Allowances
5
GOV.UK. National Insurance Rates and Categories
6
Scottish Government. Scottish Income Tax 2026 to 2027: Technical Factsheet
7
GOV.UK. Your P45, P60 and P11D Form: P60
8
GOV.UK. Expenses and Benefits for Employers
9
GOV.UK. Personal Tax Account: Sign in or Set Up
10
GOV.UK. Check Your Income Tax for the Current Year
11
GOV.UK. Income Tax: Enquiries
12
HM Revenue and Customs. PAYE Manual – Coding: Codes: How They Are Used and Calculated: P2 Notice of Coding
13
GOV.UK. Understanding Your Employees’ Tax Codes – Changes
14
GOV.UK. Tax Codes – If You’ve Paid Too Much or Too Little Tax