Tax Code After Redundancy UK: What HMRC Gets Wrong
Made redundant? Your tax code is probably wrong right now. Here's what HMRC does to it, why it costs you money, and how to fix it fast.
Redundancy is brutal enough without HMRC quietly making it worse. The moment your employment ends, your tax code enters a no-man's-land that costs thousands of people real money every single year, and most of them never realise it.
- Your tax code almost always changes after redundancy, and HMRC's default assumptions are frequently wrong.
- Redundancy pay up to £30,000 is tax-free, but anything above that is taxed, and your employer may apply an emergency tax code to the whole lot.
- Jobseeker's Allowance and other taxable benefits in payment will trigger further tax code changes mid-year.
- If you start a new job without a P45, you could pay emergency rate tax for months before HMRC corrects it.
- You can check and correct your tax code right now at /check-my-tax-code without waiting for HMRC to write to you.
This post is not about Self Assessment or sole trader taxes. It is for anyone on PAYE who has just been made redundant, is receiving statutory or enhanced redundancy pay, or is starting a new job after a gap, and wants to understand what is happening to their tax code before they lose money they are owed.
- Tax Code After Redundancy
- The PAYE tax code HMRC assigns to you once your employment ends. It determines how much income tax is deducted from any new wages, taxable redundancy pay, or state benefits. Getting it wrong can mean paying too much tax for months, or occasionally too little, which creates a bill later.
What Actually Happens to Your Tax Code When You're Made Redundant
When your employer notifies HMRC that your employment has ended, your tax code does not simply pause. HMRC's systems make a series of automated assumptions about your circumstances, and those assumptions are frequently wrong.
The most common outcome is that your code is reset to 1257L (the standard personal allowance code for 2024/25), which sounds fine. The problem is timing. HMRC calculates your cumulative tax position based on what you have already earned that year. If you were made redundant in November, you may have already used most of your £12,570 personal allowance. If you then start a new job in December, HMRC should apply the cumulative basis correctly. But if you start without a P45, or if there is a processing delay, your new employer may be forced to use an emergency tax code instead.
An emergency tax code, typically 1257L on a Week 1/Month 1 basis, treats every pay period as if it is the first of the tax year. It ignores everything you have already paid. The result: you overpay tax every single month until HMRC catches up.
The £30,000 Rule and Why It Still Trips People Up
Most people know that the first £30,000 of a genuine redundancy payment is tax-free. What fewer people know is how this interacts with their PAYE tax code in practice.
If your total redundancy package is £45,000, your employer should only deduct tax on £15,000 of it. Simple enough. But in practice, some employers apply emergency tax codes to the entire payment, particularly if the redundancy is processed quickly or the payroll team is under pressure. That could mean you have paid basic rate tax (20%) on £30,000 that should have been tax-free, a deduction of £6,000 that you are owed back.
Worse still, if you also receive payment in lieu of notice (PILON), that is treated as earnings, not as a redundancy payment, and is taxable in full from the first pound. A chunky PILON paid in a single month can push your notional monthly income into the higher rate band, and HMRC's PAYE system may tax it at 40% even if your annual income would not justify that rate.
The fix is not to argue with your employer's payroll. The fix is to reclaim the overpayment, either through your new employer's PAYE system (if you start work in the same tax year) or directly from HMRC via a P800 or R40 claim.
Starting a New Job: The P45 Problem
Your P45 is the document that carries your tax history from one employer to the next. It tells your new employer exactly how much you have earned and how much tax you have paid since April. Without it, they have no choice but to apply an emergency tax code.
The issue is that getting your P45 promptly is harder than it should be. Some employers are slow to issue them. Some send them to an old address. Some payroll departments process them weeks after your final pay. In the meantime, you have started your new job and are being taxed as if you have earned nothing all year.
If you have not received your P45 within a few weeks of leaving, do not wait. Contact your former employer's payroll department directly and ask for it. You can also fill in a Starter Checklist (the form that replaced the old P46) for your new employer, which at least ensures the correct tax code is applied based on your self-reported circumstances, rather than the default emergency basis.
For a concrete example: if you earned £40,000 in the first seven months of the tax year before redundancy, you will have already used roughly £7,333 of your £12,570 personal allowance. Your new employer, applying a Week 1/Month 1 emergency code, will give you the full monthly allowance of £1,048 again, which sounds generous. But HMRC will reconcile this at year end and may send you a tax bill for the underpayment. The emergency code does not always mean you pay too much. It means the system loses track of your actual position, and the correction arrives months later.
Jobseeker's Allowance and Other Taxable Benefits
If there is a gap between your redundancy and your next job, you may claim Jobseeker's Allowance (JSA) or, in some cases, Employment and Support Allowance (ESA). Both of these are taxable. HMRC handles the tax on JSA through a separate coding notice that reduces your personal allowance in your next employment to recover the tax owed on the benefit.
This is where things get genuinely confusing. You receive JSA, which is taxable but paid without any tax deducted. You then start a new job. Your new employer applies a tax code that already has a deduction built in to recover the JSA tax. Your take-home pay in your new job is lower than you expected, and nobody has explained why.
Universal Credit, by contrast, is not taxable, so it does not affect your tax code directly. But if you are claiming it alongside any earned income (for example, from part-time work during a job search), the interaction with your PAYE code can still produce surprises.
Checking your tax code at /check-my-tax-code at each stage, when you leave, when you start claiming any benefits, and when you start new work, is the only way to stay ahead of these changes rather than discovering a problem when the P800 arrives.
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The Year-End Reconciliation: P800 and What It Means
At the end of each tax year, HMRC runs a reconciliation of every PAYE taxpayer's account. If you have overpaid, they issue a P800 tax calculation showing the refund due. If you have underpaid, they will either collect it through your new tax code (spreading the debt over the following year) or ask you to pay it directly.
For someone who was made redundant mid-year, the P800 is almost inevitable. The combinations of employer, redundancy payment, possible JSA, and new employer are exactly the kind of multi-source income that PAYE struggles to handle cleanly in real time.
The median refund for PAYE taxpayers who receive a P800 is not publicly published by HMRC, but Citizens Advice and tax charities consistently report that overpayments of several hundred pounds are common for people who change jobs mid-year or have a period of unemployment. For someone who was earning £55,000, a miscalculation in a single month at 40% rather than 20% is worth £916 in overpaid tax. That money sits with HMRC until the reconciliation unless you actively chase it.
You do not have to wait for a P800. You can use /check-my-tax-code to review your code now, and cross-reference it with our Free Tax Code Calculator UK: What the Number Actually Tells You to understand whether the numbers on your payslip make sense.
If You Go Freelance or Self-Employed After Redundancy
A significant number of people who are made redundant use the opportunity, or the financial cushion of their redundancy payment, to go self-employed. This introduces a new layer of tax code complexity.
If you do any PAYE work in the same tax year, you will still have a tax code for that employment. But your self-employed income will need to be reported separately through Self Assessment. The interaction between your PAYE code and your self-assessment liability is a known problem area. HMRC sometimes adjusts your PAYE code mid-year to collect estimated self-employed tax in advance, which can produce unexpected deductions from any employed income.
If this sounds like your situation, the Freelance and Employed Tax Code: Why HMRC Defaults Wrong post covers this overlap in detail. For anyone moving into the trades or construction, Construction Worker Sole Trader Tax: What HMRC Tracks is also worth reading before your first invoice goes out.
What You Should Do in the First 30 Days After Redundancy
You do not need an accountant for this. You need about twenty minutes and access to HMRC's online services or a tax code checker.
First, locate your P45 and confirm the details are correct. The figure in Box 4 (total pay to date) and Box 6 (total tax deducted) are what your next employer or HMRC will use to set your code.
Second, check your tax code. Log in to your Personal Tax Account at HMRC, or use /check-my-tax-code to verify what code is currently registered against your National Insurance number.
Third, if you claim any benefits, note their taxable status. JSA is taxable; Universal Credit is not. If JSA appears in your coding notice as a deduction from your personal allowance, make sure the figure is accurate and reflects only the benefit you actually received.
Fourth, when you start your next job, give your P45 to your new employer on day one. Do not assume HR will sort it out. Chase it if necessary.
Fifth, at the end of the tax year, do not bin your P800 if HMRC sends one. It is either a cheque or a demand, and ignoring either one will cost you.
The Broader Problem: HMRC's Systems Assume Continuity
Here is the uncomfortable truth that HMRC does not advertise. The PAYE system was designed around continuous employment. It assumes you work for one employer, earn a predictable salary, and stay put. Redundancy, by definition, breaks every one of those assumptions simultaneously.
The coding notices, the reconciliation calculations, the benefit interactions: none of these were built for a world where people are made redundant in their fifties, spend three months job-hunting, take a part-time role while consulting on the side, and then start a permanent position in a new sector. But that is exactly the landscape millions of UK workers navigate.
The responsibility for correcting the errors that flow from this falls almost entirely on the individual. HMRC will eventually reconcile most overpayments, but it can take twelve to eighteen months, and it only happens automatically if the discrepancy is large enough to trigger their systems. Smaller overpayments, those under a few hundred pounds, can sit unrecovered indefinitely unless you act.
For a detailed framework on checking whether your current code is right, Verify Tax Code Accuracy UK: A Forensic Checklist gives you the step-by-step process.
Your Redundancy Was Stressful Enough
You started reading this because you were made redundant and you want to know what is happening to your tax. The short answer is: HMRC's automated systems have made a series of assumptions about you that are probably wrong, may cost you money, and will not correct themselves unless you push.
Check your tax code today at /check-my-tax-code. It takes less time than arguing with your former employer's HR department, and it might be worth more.
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