If your payslip shows a 111T tax code, HMRC is giving you only about £1,110 of tax-free pay for the year instead of the standard £12,570 personal allowance, and the “T” tells your employer not to change the code automatically because HMRC wants to review it.1GOV.UK. What Your Tax Code Means2GOV.UK. How They Are Used and Calculated: Suffix Codes That’s a reduction of roughly £11,460, and it usually points to one of a few specific causes: high-income taper, taxable workplace benefits, unpaid tax from a previous year, or the High Income Child Benefit Charge being collected through payroll. Getting to the right answer matters, because if any of those figures are wrong you’ll overpay tax every payday until it’s fixed.
What 111 and T Actually Mean
To translate a tax code number into an allowance, add a zero: 111 becomes £1,110. That’s the amount you can earn from this employment in the tax year before income tax starts. HMRC gets to that figure by taking your full personal allowance (£12,570 for 2026/27) and subtracting anything it needs to recover through your payroll.1GOV.UK. What Your Tax Code Means
The letter at the end tells your employer how to operate the code. The common “L” suffix applies the standard allowance and updates automatically when thresholds change. A “T” tells the employer to apply the tax rates as normal but blocks any automatic adjustments until HMRC has manually reviewed your file.3GOV.UK. Understanding Your Employees Tax Codes: What the Letters Mean HMRC uses T when the calculation is complex enough to need human review, typically because several adjustments are happening at once.
A 111T is not an emergency code. Emergency codes for 2026/27 are 1257L W1, 1257L M1, and 1257L X, and they apply the full standard allowance on a non-cumulative basis.4GOV.UK. Rates and Thresholds for Employers 2026 to 2027 A 111T is a specific, calculated figure HMRC has decided is correct for you unless you tell them otherwise.
Why Your Allowance Is This Low
An allowance around £1,110 means nearly £11,500 has been stripped out of the standard £12,570. That much reduction almost always comes from a single big cause or a stack of smaller ones.
The Personal Allowance Taper
This is the most common driver of a heavily reduced code. Once your adjusted net income passes £100,000, your personal allowance drops by £1 for every £2 above the threshold.5GOV.UK. Income Tax Rates and Personal Allowances To land at an allowance of about £1,110, your income would need to be around £122,920. At £125,140 the allowance disappears completely.
Adjusted net income is more than salary. It includes taxable benefits, rental income, savings interest, and pension income, reduced by things like Gift Aid donations and personal pension contributions. Someone on a £105,000 salary with £18,000 of taxable company benefits can easily reach the income level that produces a 111T.
Benefits in Kind
Perks like a company car, private medical insurance, fuel, or a beneficial loan all have a taxable value, and HMRC collects the tax by reducing your code rather than sending you a separate bill.6GOV.UK. Expenses and Benefits for Employers A company car alone can add several thousand pounds of taxable value depending on list price and CO2 emissions. Combine that with medical cover and fuel benefit and the deductions grow quickly.
Your employer reports these values to HMRC and they feed straight into your code. If you’ve swapped cars recently or picked up a new benefit, the figures HMRC is using may be estimates rolled over from last year rather than current values.
Underpaid Tax From a Previous Year
If HMRC’s year-end reconciliation shows you underpaid, the shortfall is normally collected by cutting your allowance the following year, spreading the repayment across twelve months of payroll rather than demanding a lump sum.7GOV.UK. Tax Overpayments and Underpayments This route is only used if you owe less than £3,000, earn enough above the personal allowance to absorb the deduction, and pay tax through PAYE.8GOV.UK. Pay Your Self Assessment Tax Bill: Through Your Tax Code
High Income Child Benefit Charge
If you or your partner receives Child Benefit and one of you earns more than £60,000, a tax charge claws some of it back. For every £200 of income above £60,000, you owe 1% of the Child Benefit; at £80,000 or more, the full amount is repaid.9GOV.UK. High Income Child Benefit Charge If you’ve asked HMRC to collect this through PAYE instead of Self Assessment, it comes straight out of your allowance and can be one of several deductions stacking up behind a 111T.
A Split Allowance Across Jobs or Pensions
Your personal allowance is divided between income sources, not duplicated. The full allowance normally sits with your main job, and a second job runs on a BR code with no tax-free amount. If HMRC has split the allowance instead, a secondary income can end up with a small slice like 111 while the bulk stays on the primary source.
What This Code Costs You in Tax
With a 111T code, the first £1,110 you earn from that employment is tax-free. Everything above is taxed at the 2026/27 rates: 20% up to £50,270 of total income, 40% between £50,271 and £125,140, and 45% above £125,140.10House of Commons Library. Direct Taxes: Rates and Allowances for 2026/27
To put rough numbers on it: on a £50,000 salary with a 111T code, about £48,890 is taxable, producing around £9,778 in income tax for the year, or roughly £815 a month. On the standard 1257L, only £37,430 of that same salary would be taxable, producing around £7,486 a year. The 111T costs that person about £2,292 extra across the year. That gap is the tax on benefits, underpayments, or taper adjustments being pulled through your payroll.
Checking Whether the Code Is Right
The quickest check is your HMRC Personal Tax Account or the HMRC app. Both show a full breakdown of how the 111 was calculated, line by line.11GOV.UK. Tax Codes Go through each item. Does the company car value match the car you actually drive? Is there an underpayment listed that you’ve already settled? Are benefits still in the calculation that you no longer receive? Is HMRC’s estimate of your income realistic for this year?
Two documents help you verify the numbers. Your P60, which your employer must issue by 31 May, shows total pay and tax for the year to 5 April.12GOV.UK. Your P45, P60 and P11D Form: P60 If you receive taxable benefits, your employer also submits a P11D listing the cash value of each one.13GOV.UK. Your P45, P60 and P11D Form: P11D Compare those figures against the deductions in your code breakdown. Mismatches are where errors live.
How to Get the Code Changed
If something’s wrong, the fastest route is the Check your Income Tax service inside your Personal Tax Account. You can update your estimated income, report benefit changes, or flag an underpayment that’s already been paid. HMRC recalculates and notifies your employer within 15 working days.14GOV.UK. How to Update Your Tax Code
You can also call the HMRC Income Tax helpline with your National Insurance number and a recent payslip. After processing, HMRC sends a P2 Notice of Coding confirming the new tax-free amount and the calculation behind it. Your employer gets the new code electronically and applies it from the next pay run.
Because a T code doesn’t refresh on its own, acting on a correction matters more than for a standard L code. Waiting means the wrong figure stays in place until HMRC eventually reviews it.
If You’ve Already Overpaid
If the 111T was wrong and too much tax has come out, there are two paths for getting it back. When the correction lands during the same tax year, your employer applies the new code cumulatively, so your next payslip includes a larger net payment as payroll catches up on the allowance you were owed.
If the tax year has already ended, HMRC issues a P800 calculation showing whether you overpaid or underpaid. Overpayments can be claimed through your Personal Tax Account, and refunds usually arrive within five to six weeks; if you don’t claim online, a cheque follows by post but takes longer.7GOV.UK. Tax Overpayments and Underpayments The sooner you challenge a code you think is wrong, the smaller the overpayment you have to chase.