A tax code checker is any official way of seeing the PAYE tax code that HMRC has given your employer or pension provider, and the quickest route is your personal tax account on GOV.UK. A tax code is a short mix of numbers and letters that tells an employer how much tax-free pay to allow before collecting Pay As You Earn (PAYE) income tax. It has nothing to do with the registration number on a car, but plenty of people searching for "tax" end up here by mistake.
Part of Car Tax Checks. Start with the main guide: Is My Car Taxed? Check Tax Status Free
Updated October 2026 · Independent information, not legal advice
Because the two meanings of "tax" are so easily confused, it helps to separate them early. Income tax codes are issued by HMRC and appear on payslips. Vehicle tax, known as vehicle excise duty (VED) or road tax, is run by the Driver and Vehicle Licensing Agency (DVLA) and is checked by registration number. Both are explained below, along with how to check each one safely.
What Is A Tax Code?
A tax code is a short reference, usually a number followed by a letter, that HMRC sends to your employer or pension provider so they know how much of your pay to treat as tax-free. It is a PAYE instruction, not a bill and not a rate.
Why the code exists
Without a code, an employer would not know what allowances apply to you. The code lets them take the right amount of income tax each pay period without waiting for the end of the tax year.
A code is not a rate
The digits in a code summarise allowances; the letter adds context. Neither is a percentage. Current allowances and rates are published by GOV.UK and change by tax year, so check there rather than relying on figures quoted in forums.
What Does A Taxation Code Look Like?
A taxation code, the longer way of saying tax code, normally combines digits and one or more letters, for example a number ending in L. The exact digits depend on your personal circumstances, so treat any example you see online as a format only.
The number part
The number is a shorthand for the amount of income you can receive before tax is taken. HMRC works it out from your allowances, adjusted for things such as taxable benefits or tax owed from earlier years.
The letter part
The letter describes your situation. Common ones include:
- L for the standard tax-free allowance
- M or N where part of an allowance has been transferred between a married couple or civil partners
- T where HMRC needs to review other items
- BR, D0 and D1 where all income is taxed at a set rate band
- 0T where no allowance has been applied
- K where deductions exceed allowances
How Can I Check My Tax Code?
If you ask how can I check my tax code, the dependable answers are your payslip, your P60, a letter or notice from HMRC, and your personal tax account on GOV.UK. Each shows the code that applies to that income.
Step by step with your personal tax account
- Go to GOV.UK and search for the HMRC personal tax account.
- Sign in with your Government Gateway details or the identity method offered.
- Select the income tax section.
- Choose to view your tax code for the current and earlier tax years.
- Compare it with the code on your payslip.
Check Tax Code Online With The HMRC App
The HMRC app, available from official app stores, offers many of the same functions. If you want to check tax code online and prefer a phone, it is a legitimate option, but download only the official version.
Where A Code Appears On Paper
A payslip usually prints the code beside the tax figures. A P45 from a previous employer shows the code used at the time you left. A P60 shows the code at the end of the tax year.
Is There A Tax Code Checker That Is Not HMRC?
Third-party calculators exist, but only HMRC can confirm the code actually issued to you. Unofficial tools can estimate a code from typed-in figures, which is useful for planning, not for proof.
When a calculator helps
If you are comparing a job offer or a change of pay, an estimate can show roughly how the code might behave. Use a reputable calculator and treat the answer as indicative.
When only HMRC will do
If you think your code is wrong, a calculator cannot fix it. Only HMRC can change a code, and it normally needs your details or your employer's reference.
How Do I Check Tax Codes For Earlier Years?
To check tax codes from earlier years, sign in to your personal tax account, where previous years' details are often available, or look at old payslips and P60 documents. Where an employer has closed, HMRC records are the fallback.
Why Past Codes Matter
If you later suspect you overpaid or underpaid, the code that applied is part of the evidence. It also helps when HMRC asks you to explain a difference. Related questions are covered in how to check a tax rebate.
If a record is missing
Ask HMRC through the official channels listed on GOV.UK. Do not pay a third party to retrieve information that HMRC provides free.
Why Might My Code Change?
Your code can change when your circumstances, benefits or allowances change, and HMRC usually issues a new code to your employer without you asking. A letter or message often follows.
Common triggers
- Starting a second job or pension
- Receiving a company car or other taxable benefit
- Changes to marital status or a transferred allowance
- Underpaid tax from a previous year being collected through the code
- A new tax year starting
Emergency Codes
A new employer may use an emergency code until HMRC supplies the correct one. It is temporary and often corrects itself, but it can lead to over- or under-payment in the meantime.
What If My Tax Code Looks Wrong?
If a code looks wrong, compare it with your payslip, review your personal tax account, then contact HMRC to confirm your details. Do not simply ask your employer to change it, because only HMRC can issue a replacement.
A short checklist
- Note the code on your payslip.
- Check the code in your tax account.
- List any benefits, second jobs or pensions.
- Contact HMRC through GOV.UK if they do not match.
- Keep a record of what you were told.
What an employer can and cannot do
An employer applies the code HMRC supplies. They can pass on a query but cannot override HMRC.
Does A Company Car Affect My Tax Code?
A company car can affect your tax code because HMRC may collect the benefit in kind (BIK) tax on it through your code. Benefit in kind is a charge on the value of a benefit given to you by an employer.
How the car is valued
HMRC assesses the charge using the car's list price, its CO2 emissions and its fuel type, and the employer reports it. No rates are listed here; use the GOV.UK and HMRC tools.
Electric company cars
An electric vehicle is often treated differently from petrol or diesel in company car tax, but the rules change between tax years. Check the latest HMRC guidance, and see the company car tax calculator for the wider topic.
Tax Code Or Vehicle Tax: Which Are You Looking For?
Many searchers who type "tax" and then a code or checker mean car tax, which runs on the registration number. The two systems are unrelated.
| Feature | PAYE tax code | Vehicle tax (VED) |
|---|---|---|
| Run by | HMRC | The DVLA |
| Applies to | A person's earnings | A vehicle on the road |
| Checked with | Personal tax account, payslip | Registration number, V5C |
| Typical format | Number and letter | Status and due date |
| Official source | GOV.UK / HMRC | GOV.UK / DVLA |
How To Check Car Tax Instead
Enter the registration into the free number plate check to see whether the vehicle is taxed and when the next payment is due. Or read how to check if a car is taxed.
When confusion leads to scams
Fraudsters also play on this overlap. Texts that mention "tax" and a refund can be about either system, and are often fake.
What Is Vehicle Excise Duty?
Vehicle excise duty (VED) is the formal name for road tax, charged on vehicles used or kept on public roads in the UK. The DVLA collects it and links it to the vehicle's record, not to the keeper.
What decides the amount
The amount typically depends on factors such as registration date, fuel type, CO2 emissions, list price and vehicle type. Current figures are published on GOV.UK, so none are given here. More detail sits in vehicle excise duty explained.
Payment Methods
Tax can usually be paid online with a direct debit or a one-off payment. A reference from the V5C or a reminder letter normally helps. See road tax online.
How Is Vehicle Tax Checked By Registration?
You check vehicle tax by registration with a free lookup that reads the DVLA record and shows the status and due date. It is a snapshot, so run it again before you drive or buy.
What the result shows
- Taxed, untaxed, SORN or exempt
- The date the next payment is due
- MOT status and expiry
- Fuel type, engine size and CO2 emissions where recorded
What it does not show
It does not show owner names, insurance or finance. Those sit in other systems, and personal details are protected.
Is A Tax Code The Same As A Tax Disc?
No. A tax code belongs to PAYE income tax, while a tax disc was the paper circle once displayed in a windscreen to show vehicle tax was paid. Paper discs were phased out when the DVLA moved to electronic records.
Why old words persist
People still say "tax disc" and "road tax" out of habit. Today the DVLA record is the proof of vehicle tax, not anything in the windscreen.
Searching the right system
If you typed a tax code and meant a car, use the registration route. If you meant income tax, use your personal tax account.
What About Tax On A Vehicle That Is Off The Road?
A vehicle that is kept off the public road can be declared with a Statutory Off Road Notification (SORN). Doing so stops the vehicle tax, and any refund for full unused months is normally issued automatically.
SORN is not income tax
SORN has no connection with your PAYE code. It is a DVLA declaration. For the steps, see how to SORN your car.
Checking someone else's status
You can check whether a vehicle is SORN through its registration. See check if a vehicle is SORN.
Could A Car Tax Refund Be Confused With An Income Tax Refund?
Yes, and that is a common trap. A car tax refund comes from the DVLA when a vehicle is sold, scrapped, SORNed or has tax cancelled, and it relates to full unused months. An income tax refund comes from HMRC.
Where each refund comes from
- Car tax refund: the DVLA, usually after a sale, scrapping or SORN
- Income tax refund: HMRC, after an overpayment through PAYE or self assessment
Where to learn more
Read the explanation of a car tax refund and the neutral outline of PAYE income tax and take-home pay.
How Do I Spot A Fake Tax Code Or Refund Message?
A genuine HMRC message never asks for bank details by text or email in order to release a refund. If a message arrives that you did not expect, do not click the link.
Warning Signs
- A link to an unfamiliar address
- Urgent language and deadlines
- A request for card or bank details
- A sender who does not match HMRC or the DVLA
- Poor spelling or odd formatting
What to do
Go directly to GOV.UK by typing the address yourself, then sign in. Forward suspect messages to the official reporting address on GOV.UK.
What Documents Help With A Tax Code Query?
A few documents usually settle a tax code query faster. Keep them together before you contact HMRC.
- Recent payslips
- Your P60 or P45
- Letters or notices from HMRC
- Details of benefits such as a company car
- Your National Insurance number
- Your employer's name and PAYE reference
- Any HMRC online account messages
For vehicle tax queries
The V5C, the vehicle's registration and the reminder letter from the DVLA are the equivalents.
What Happens If The Code Is For A Second Job Or Pension?
Different income sources often use different codes, and a second job or a pension frequently receives a code that applies no allowance, because the main income has used it. This can look alarming but is a normal result.
Why not every code matches
Your tax account may list several codes at once. Check each against the payslip for that income.
When to ask HMRC
If the split of allowances does not reflect your real position, ask HMRC to review it.
Do Pensioners And The Self-Employed Have A Tax Code?
Pension providers use tax codes in the same way as employers. Self-employed people usually pay through self assessment rather than a PAYE code, although one may still appear if they also have an employer.
Older drivers and tax
People searching for older-driver changes sometimes mean vehicle tax. See older drivers and car tax changes for the neutral explanation.
Where to check
Your personal tax account on GOV.UK is the first stop for either situation.
How Does A Tax Code Checker Relate To A Tax Calculator?
A calculator estimates; a checker confirms what is recorded. If you want to model figures, use a calculator. If you want the code HMRC holds, use the official account.
A mixed calculator
A single tax calculator covering car, company car and income tax topics helps you pick which tool fits which question.
Why estimates vary
Estimates depend on the inputs and the tax year. Always confirm on GOV.UK.
Where Is The Nearest Tax Office?
Most HMRC and DVLA services are now online or by phone, and a walk-in office is rarely the route. See tax office near me for the difference between HMRC, the DVLA and local options.
Contacting HMRC
Use the contact options published on GOV.UK. Phone lines, webchat and hours change, so they are not listed here.
Contacting the DVLA
For vehicle queries, see DVLA chat and contact options.
Mistakes People Make With Tax Codes
Most problems come from assuming the code is wrong without checking, or from ignoring a letter from HMRC.
Typical Errors
- Assuming a code is a tax rate
- Copying a friend's code
- Ignoring a notice about a changed code
- Confusing income tax with vehicle tax
- Paying a site to look up what is free on GOV.UK
Quick fixes
Check the payslip, check the account, and ask HMRC if something still does not fit.
Myths About Tax Codes And Car Tax
A few beliefs travel widely and cause needless worry.
Myth: a higher number is always better
Not necessarily. The number reflects allowances and adjustments, so what matters is whether it suits your circumstances.
Myth: road tax is paid with your PAYE code
It is not. Road tax is a separate vehicle charge collected by the DVLA.
Myth: you can pay a refund claim company to unlock money
Official routes are free. Be cautious of anything that charges for what GOV.UK offers.
What Changes Between Tax Years?
Tax years start in April, and allowances, rates and thresholds can be revised. Codes may therefore be reissued at the start of a year.
Vehicle tax changes
Vehicle tax policy is set by government and can shift in a Budget. For an outline of how announcements work, see Budget car tax changes.
Keeping up
Rely on GOV.UK for current figures and confirm before acting on anything reported elsewhere.
Quick Reference: Which Service For Which Question?
Use this list to choose the correct source quickly.
- Income tax code: personal tax account on GOV.UK
- Payslip questions: your employer, then HMRC
- Is a car taxed: free registration lookup or GOV.UK
- Car tax refund: the DVLA
- Company car benefit: HMRC
- SORN: the DVLA
Official sources
GOV.UK, HMRC for income tax, and the DVLA for vehicle records.
Frequently Asked Questions
What is a tax code checker?
A tax code checker is an official way to see the PAYE code HMRC has issued for your income. The most reliable one is your personal tax account on GOV.UK, which shows the code for the current and earlier tax years. Payslips, P60s and HMRC letters also show it. Unofficial calculators can estimate a code but cannot confirm the one HMRC actually holds for you.
How can I check my tax code?
Sign in to your personal tax account on GOV.UK or the HMRC app, open the income tax section and view your tax code. You can also read it on a payslip, a P60 or a P45. If the figures disagree, contact HMRC through the routes on GOV.UK. Only HMRC can issue or correct a code, not your employer.
Can I check tax code online for free?
Yes. HMRC provides the personal tax account and app at no charge, and GOV.UK explains how to sign in. You never need to pay a third party to look up a code. Treat any service that charges for this with caution, and avoid links in unexpected texts or emails claiming to offer a refund or a code check.
Can I check tax codes from earlier years?
Often you can. Your personal tax account normally lets you view details of previous years, and old payslips, P45s and P60s show the codes used at the time. If something is missing, contact HMRC through GOV.UK. Keep documents from previous employers, because they can be useful if HMRC ever queries an underpayment or an overpayment.
What does the letter in a tax code mean?
The letter describes your tax situation. L usually reflects the standard tax-free allowance, M and N relate to transferred allowances between couples, T signals items HMRC needs to review, and K means deductions exceed allowances. BR, D0 and D1 indicate income taxed at set bands. Exact meanings and rates are on GOV.UK, so confirm there.
Is a tax code the same as a vehicle tax number?
No. A tax code applies to income and is issued by HMRC. Vehicle tax is linked to a registration number and recorded by the DVLA. You check vehicle tax with a registration lookup, not with a code. If you meant car tax, use the free number plate check or the GOV.UK vehicle enquiry service to see status and due date.
Can my employer change my tax code?
No. An employer applies the code HMRC supplies. They can pass on your query or send details to HMRC, but only HMRC can change a code. If your code looks wrong, check your personal tax account first, then contact HMRC with your payslip and any notices you have received.
Why is my tax code different on a second job?
A second job or a pension often receives a code that gives no extra allowance, because the allowance is already used against your main income. It is a normal outcome rather than an error. If the split does not reflect your circumstances, ask HMRC to review it and check each code against its payslip.
Does a company car change my tax code?
It can. HMRC may collect the benefit in kind charge on a company car through your code, using the car's list price, CO2 emissions and fuel type. The employer reports the benefit. Details change by tax year, so use HMRC and GOV.UK tools to see how your own code has been adjusted.
Does vehicle excise duty affect my income tax code?
No. Vehicle excise duty, often called road tax, is a separate charge paid on a vehicle and collected by the DVLA. It does not appear in your PAYE code. The only car-related link is when an employer provides a company car, where a benefit in kind charge may be collected through the code.
How can I tell if a tax message is fake?
Be suspicious of any unexpected text or email that offers a refund, asks for bank or card details or creates urgency. HMRC and the DVLA do not release refunds that way. Type the GOV.UK address yourself, sign in there, and do not use links in the message. Forward suspect messages using the reporting details on GOV.UK.
Where do I check a car tax refund instead?
A car tax refund comes from the DVLA, usually when a vehicle is sold, scrapped, SORNed or the tax is cancelled, and it normally covers full unused months. Check the vehicle's tax status with the free registration lookup and the DVLA's service on GOV.UK. Income tax refunds come from HMRC and are checked in your personal tax account.
Is a tax code checker the same as a tax rebate checker?
Not exactly. A code checker shows the code HMRC has issued, while a rebate check looks at whether you have paid too much tax over a period. They are related because a wrong code can lead to overpaying, but each is checked through HMRC. For vehicles, the equivalent is a car tax refund through the DVLA.
Official Sources
Rules, fees and deadlines change. Confirm anything that affects your money or legal position with the official service.