A 474L tax code means HMRC has set your tax-free personal allowance at £4,740 for the year instead of the standard £12,570 that a 1257L code gives most employees. The letter L confirms you still qualify for the standard personal allowance; the number tells you HMRC has reduced it by £7,830. That reduction almost always reflects taxable benefits from your employer, tax underpaid in a previous year, or other untaxed income that HMRC is collecting through your wages.
What the Number and Letter Mean
Every PAYE tax code has two parts. The number is your tax-free allowance with the last digit removed, so 474 stands for £4,740 and 1257 stands for £12,570. The letter tells your employer which category of allowance applies. L means the standard personal allowance, even when the amount has been trimmed from the £12,570 baseline.
A prefix changes where your income tax is routed but not how the allowance is calculated. S474L applies to Scottish taxpayers, whose income above the allowance is taxed using Scotland’s own bands, including a 42% higher rate that starts at £43,663 rather than £50,271. C474L applies to Welsh taxpayers. The £4,740 figure itself is the same wherever you live in the UK.
Why Your Allowance Was Cut to £4,740
HMRC arrives at 474L by taking £7,830 off the standard allowance. A single deduction can be behind it, but often two or three stack up. Working through the possibilities against your own circumstances is the fastest way to know whether the code is right.
Benefits in Kind
A company car, private medical insurance, or an interest-free loan from your employer counts as taxable income under the Income Tax (Earnings and Pensions) Act 2003. Rather than sending a separate bill, HMRC lowers your personal allowance so the extra tax comes out of your monthly pay. The taxable value of each benefit appears on the P11D your employer files with HMRC. A company car alone can account for several thousand pounds of the reduction.
Underpaid Tax From a Previous Year
If you owe tax from an earlier year, HMRC can “code it out” by cutting this year’s allowance so you repay the shortfall gradually through payroll. Underpayments up to £2,999.99 can be collected this way. £3,000 or more cannot, and HMRC will contact you to arrange payment separately.
Untaxed Income
Savings interest, dividends above the £500 dividend allowance, or rental income that hasn’t been taxed at source can all pull your code down. HMRC estimates how much you’ll receive and shrinks the allowance so the right tax comes out over the year.
Marriage Allowance
Transferring £1,260 of your personal allowance to a spouse or civil partner under the Marriage Allowance takes that same amount off your own allowance. On its own that produces a code of 1131L, but stacked with other deductions it can push the code well below that.
High Income Child Benefit Charge
If your income is above £60,000 and you or your partner receive Child Benefit, you can ask HMRC to collect the High Income Child Benefit Charge through your tax code instead of filing a Self Assessment return. That reduces your coded allowance further.
What It Costs You Each Month
On 474L, only £395 of monthly pay (about £91 a week) is tax-free, compared with £1,047.50 under 1257L. Everything above that is taxed at the rate for your band.
A basic-rate taxpayer pays 20% on the extra £7,830 of income that’s no longer sheltered by the allowance. That’s £1,566 more tax per year, or roughly £130.50 less in each monthly paycheck. If you can match that figure against specific deductions, such as a £5,000 company car benefit plus a £2,830 coded-out underpayment, the code is doing what HMRC intended.
Higher-rate taxpayers earning above £50,270 lose 40% of the same £7,830, which costs £3,132 per year or about £261 a month. Anyone above £125,140 pays the additional rate of 45%, taking the annual cost to £3,523.50.
How to Check Whether 474L Is Correct
HMRC’s “Check your Income Tax” online service shows exactly how your code was built: the starting personal allowance, each deduction applied, and the resulting number. The HMRC app displays the same breakdown.
Before you look, pull together a recent payslip, your most recent P60, and any P11D you’ve received. The payslip confirms the code your employer is running. The P60 shows last year’s pay and tax and helps you see whether an old underpayment has been coded into this year. The P11D lists the taxable value of each benefit in kind, which you can line up against the deductions HMRC has entered.
The errors worth looking for are specific. Benefits you no longer receive but that are still being deducted. Estimated untaxed income set too high. An underpayment you already cleared through Self Assessment being collected a second time through your code. None of these correct themselves.
How to Get the Code Changed
You can update income details, report that a benefit has ended, or flag other changes directly through “Check your Income Tax.” The HMRC Income Tax helpline handles more complicated cases.
Once HMRC agrees to a change, it issues a P2 Coding Notice to you and sends the new code electronically to your employer’s payroll. Most employers apply it in the next pay run, though it can take a few weeks to appear. If you were overtaxed on the wrong code, the excess is usually refunded through later paychecks as payroll recalculates your position for the year.
Claiming Back Overpaid Tax
If 474L was wrong and you paid too much tax, you’re entitled to a refund. In most cases HMRC issues a P800 tax calculation after the tax year ends; if it shows an overpayment, you can claim online or wait for a cheque. You have four years from the end of the relevant tax year to claim overpaid income tax, so older overpayments aren’t automatically lost once you spot them.
If instead HMRC finds you were undertaxed because a benefit or other income wasn’t reported, penalties can apply. A genuine mistake where you took reasonable care typically carries no penalty. Carelessness can attract up to 30% of the underpaid tax, and deliberate errors 20% to 70%. Disclosing the problem early and helping HMRC work out what’s owed reduces the penalty.
When 474L Isn’t What You’re Actually Dealing With
A code ending in W1, M1, or X is an emergency code, not a reduced-allowance code. Emergency codes usually appear when you start a new job before your employer has your tax details, and they tax each pay period in isolation rather than spreading the allowance across the year. They generally resolve themselves once HMRC sends the correct code.
A K code is the opposite of 474L in structure: deductions have exceeded your entire personal allowance, so instead of tax-free pay you have extra taxable income added on. If the deductions behind a 474L code grew by another £4,740, the code would tip into K territory.
Whichever code you’re on, checking it through your personal tax account takes a few minutes and can stop months of unnecessary deductions before they add up.