If you have spotted “500T” on your payslip and have no idea what it means, you are not alone. The 500T tax code is a temporary code that HMRC assigns when they do not have enough information about your tax situation to give you the correct, permanent code. In plain terms, it is a placeholder — and while it is not something to panic about, it does need to be sorted out quickly to make sure you are not paying more tax than you should.
What Does the 500T Tax Code Actually Mean?
To understand the 500T tax code, it helps to break it into two parts:
The number “500” means HMRC has temporarily assigned you a personal allowance of £5,000 for the year. This is the amount of income you can earn before you start paying tax. The standard personal allowance for most people in the 2025/26 tax years is £12,570 — so under the 500T code, your tax-free amount is less than half of what it should be. That means you will likely pay more tax than necessary until the code is corrected.
The letter “T” tells HMRC and your employer that your tax code includes other calculations or adjustments that need to be reviewed. According to HMRC’s own guidance, the T suffix means “your tax code includes other calculations to work out your Personal Allowance.” It signals that your situation is not straightforward and requires further attention.
Put together, the 500T tax code means: HMRC does not yet have a complete picture of your income or personal circumstances, so they are applying a temporary, reduced allowance while they gather more information.
Is the 500T Tax Code the Same as an Emergency Tax Code?
This is one of the most common questions people ask — and the answer is: yes, it can be. The 500T code often acts as an emergency tax code, particularly when there is a gap in information. However, it is slightly different from codes like 1257L W1/M1, which are the most commonly used emergency codes.
The key difference is that 500T uses a reduced personal allowance of £5,000, whereas a standard emergency code like 1257L W1/M1 applies the full basic allowance but on a non-cumulative basis. Both are temporary. Both can result in you paying too much tax. But 500T is typically used in more complex or uncertain situations.
Why Has HMRC Given Me the 500T Tax Code?
There are a few common reasons you might find yourself on the 500T tax code:
Did You Start a New Job Without Providing a P45?
One of the most frequent reasons for the 500T code is starting a new job without handing over your P45 from your previous employer. The P45 shows your new employer how much you have earned and how much tax you have already paid in the current tax year. Without it, they cannot work out the right code to apply, so HMRC steps in with a temporary one.
If this is your first job and you have never had a P45, the same issue can arise. Your employer will not have the information needed to confirm your correct tax position, which can lead to a temporary code being issued.
Do You Have More Than One Source of Income?
If you are self-employed alongside being employed, or you receive income from more than one job, HMRC may apply the 500T code while they work out how to split your personal allowance across your different income sources. This is especially common if one income source is newly added and HMRC has not yet updated their records.
Freelancers and contractors who also work for an employer often encounter this situation. HMRC needs time to assess how your total income should be treated before settling on the right codes.
Has Your Tax Situation Recently Changed?
Life changes can trigger the 500T code. If you have recently got married, become eligible for tax relief on certain expenses, started receiving a pension, or changed your employment status, HMRC may apply the 500T while they update your records and calculate your new entitlements.
Any change that affects your personal allowance or tax liability can temporarily put you on this code until things are reassessed.
Is HMRC Still Waiting for Information From Your Employer?
Sometimes the issue is purely administrative. If your employer’s payroll team has not yet submitted the correct starter information to HMRC, or if there has been a delay in processing your details, HMRC may issue the 500T as a holding code. It ensures you are still being taxed in the meantime, even if the exact amount is not quite right yet.
How Does the 500T Tax Code Affect How Much Tax I Pay?
The 500T code works on a non-cumulative basis. This is an important distinction, and it is worth understanding what it means.
Most standard tax codes work cumulatively throughout the tax year. That means your employer looks at your total earnings and total tax paid so far, then works out what you still owe. If you earned less in January, for example, the system naturally adjusts so you pay less tax in February to compensate.
With a non-cumulative code like 500T, none of that applies. Each pay period is treated in isolation. Your employer calculates your tax based only on what you earned that particular week or month, without reference to anything paid before. Any overpayments from earlier in the year are not automatically credited back.
The practical result? If you are on the 500T code, there is a good chance you are overpaying tax. Because the personal allowance of £5,000 is far lower than the standard £12,570, you will hit the taxable threshold sooner and end up handing over more to HMRC than you need to.
The good news is that overpaid tax does not disappear. Once HMRC corrects your code, any excess amount you have paid will typically be refunded — either automatically through your payslip or via a tax repayment.
What Should I Do If I Am on the 500T Tax Code?
The most important thing is not to leave it sitting there. The sooner you act, the sooner your code gets corrected and the less tax you will have overpaid.
How Do I Contact HMRC About My Tax Code?
You have a couple of options for reaching HMRC:
By phone: Call the HMRC income tax helpline on 0300 200 3300. Lines are open Monday to Friday, 8am to 6pm. Have your National Insurance number ready before you call.
Online via your Personal Tax Account: If you have a Government Gateway ID, you can log in at HMRC’s website, view your current tax code, and update your employment and personal details directly. It is free to set up if you do not already have one, and it gives you a clear view of your tax position at any time.
When you do contact HMRC, be ready to explain your situation clearly — why you might have been assigned the 500T code, what has changed, and what information they might be missing.
What Documents Should I Have Ready?
Before contacting HMRC, it is worth gathering the following:
- Your P45 from a previous employer (if you have one)
- Recent payslips from your current job
- Your P60 from the previous tax year, if available
- Details of any other income sources, such as freelance earnings or rental income
- Your National Insurance number
Having these ready will speed up the process considerably.
Should I Also Tell My Employer?
Yes — it is worth letting your payroll department know that you are in touch with HMRC about your tax code. Once HMRC issues a new code, your employer’s payroll system will be updated. But it can help to give them a heads-up so they know to look out for it and apply it correctly on your next pay run.
How Long Will I Stay on the 500T Tax Code?
There is no fixed timeline, but in most straightforward cases the code gets corrected within a few weeks once HMRC has the information they need. If you contact them promptly and provide all the necessary details, things tend to move fairly quickly.
More complex situations — such as multiple income sources or outstanding tax from previous years — can take a little longer to resolve. Staying on top of any correspondence from HMRC and responding promptly will help prevent unnecessary delays.
What Happens If I Have Overpaid Tax on the 500T Code?
Once your correct tax code is applied, HMRC will usually sort out any overpayment automatically. If you are still in the same tax year, the overpaid amount is often adjusted through your payslip over the remaining months. If the tax year has already ended, you may need to request a refund through HMRC’s online portal or by post using the relevant form.
It is always a good idea to check your payslips after your code is updated to confirm the right deductions are being made going forward.
What is the Difference Between 500T and 1257L?
You will often see these two codes mentioned together, so it helps to understand how they differ:
1257L is the standard tax code for most employed people in the UK for 2024/25 and 2025/26. The number 1257 represents a personal allowance of £12,570, and the L means you are entitled to the standard allowance with no complications. It works cumulatively across the year.
500T, by contrast, applies a temporary personal allowance of just £5,000, works on a non-cumulative basis, and signals that your tax situation requires further review. It is a temporary code — 1257L is what most people should be on once things are sorted.
If you have been on 500T for more than a few weeks and have not heard anything from HMRC, it is worth chasing to make sure your query has been picked up.
Can a Tax Adviser Help Me Fix the 500T Tax Code Faster?
Yes, absolutely. While you can contact HMRC directly, working with a qualified accountant or tax adviser takes the pressure off you. They can speak to HMRC on your behalf, make sure all the right information is submitted, and check whether you are owed a refund for any tax you have overpaid.
This is particularly useful if your tax situation is more involved — for example, if you are self-employed alongside being employed, if you have untaxed income from investments or property, or if you have had issues with previous tax years that have not been resolved.
At Right Choice Consulting, we work with business owners and self-employed individuals across the UK who find the tax system confusing or time-consuming. Whether it is sorting out a temporary tax code, filing your Self Assessment, or managing your accounts, we are here to make things straightforward.
A Quick Summary
| Detail | |
|---|---|
| Tax Code | 500T |
| Type | Temporary / Non-cumulative |
| Personal Allowance Applied | £5,000 |
| Standard Allowance (2025/26) | £12,570 |
| Why It’s Issued | HMRC lacks information to assign the correct code |
| Common Triggers | New job, missing P45, multiple incomes, life changes |
| What To Do | Contact HMRC on 0300 200 3300 or via Personal Tax Account |
| Risk | Overpaying tax until the code is corrected |
The Bottom Line
The 500T tax code is not something to worry about in the long run, but it is something you should deal with quickly. Left alone, it can result in you handing over more tax than you need to — and while you will eventually get that money back, it is far better to have the right code applied from the start.
If you are unsure about your tax code or need help getting it sorted, speaking to a professional is always the safest route. Our team at Right Choice Consulting is happy to help — get in touch and we will make sure your tax affairs are in order.
Disclaimer: All the information provided in this article is general in nature and it does not intend to disregard any of the professional advice.