Lost P45: What to Do If You've Misplaced This Crucial Tax Document in 2026

Losing important tax paperwork happens more often than you might think. If you are reading this because you have a lost P45 situation on your hands, take a breath — you are not alone. Thousands of employees across the UK find themselves in this exact position every year, whether they have moved house, changed jobs suddenly, or simply misfiled the document somewhere at home. The worry that comes with a missing document is understandable: you need it for your new employer, you fear being placed on an emergency tax code, and you may not know what steps to take next. The good news is that HMRC has clear procedures for exactly this scenario. In this comprehensive guide, you will learn what to do about a lost P45, how to get your tax information from alternative sources, and why you will not lose money just because the physical form is gone.

This is how the paper copy of a UK P45 looks:

What Is a P45 and Why Does It Matter?

A P45 is an official HMRC document titled "Details of employee leaving work." Your employer issues it on your final payday when your employment ends, regardless of whether you resigned, were made redundant, retired, or were dismissed. It summarises your earnings and tax deductions up to your leaving date in the current tax year.

When you have a lost P45, you lose access to a document that contains critical information your next employer needs to set up your tax code correctly. Without it, your new employer cannot see how much tax you have already paid this year, which tax code applies to you, or what your year-to-date earnings are. This is why misplaced forms can lead to temporary emergency tax codes — not because you have done anything wrong, but because the information simply is not available on paper.

The Four Parts of a P45 Explained

A standard P45 consists of four colour-coded parts, each serving a distinct purpose in the PAYE system:

When you experience a lost P45 scenario, you are typically missing Parts 1A, 2, and 3 — the three sections handed to you physically or digitally by your former employer. Part 1 has already been sent to HMRC electronically through RTI, so HMRC already holds that data internally.

What Information Appears on a P45?

Each P45 contains the following details:

• Your full name and home address
• Your National Insurance number
• Your tax code at the time of leaving
• Date you left the employment
• Total taxable pay earned since 6 April of the current tax year
• Total Income Tax deducted since 6 April
• Your previous employer's PAYE reference number
• Student loan deduction status (if applicable)

If you have a lost P45, all of this information can still be retrieved. Your Personal Tax Account online or the HMRC app stores your pay and tax details for the last five tax years, which covers everything you would need to verify your records.

What to Do If You Have a Lost P45

Discovering you have a lost P45 does not need to derail your job transition. HMRC has established clear procedures for employees who cannot produce their form, and your new employer will have encountered this situation many times before. Here is the step-by-step process you should follow.

Step 1: Contact Your Former Employer or Check Software Portals First

Before taking any other action, check whether you still have access to your former employer's digital HR or payroll portal. Modern self-service platforms such as ADP, Workday, Sage Employee Online, or BrightPay often allow former employees to log in for 30 to 90 days after leaving to download an archived PDF copy of their P45 directly. This is usually the fastest self-service route.

If you do not have portal access, reach out directly to your previous employer's HR or payroll department. Even though they cannot legally issue a second original P45, they can confirm:

• Your tax code on the leaving date
• Total gross pay earned in the current tax year up to your leaving date
• Total tax deducted during the same period
• Their PAYE reference number for your records

Having this information handy can speed up your onboarding at a new job even with a misplaced form. Write these details down or screenshot any email confirmation — they help you fill in the Starter Checklist accurately.

Step 2: Complete the HMRC Starter Checklist

The HMRC Starter Checklist (which replaced the old P46 form in 2013) is the official document your new employer uses when you cannot provide a P45. You do not send this form to HMRC yourself — your employer keeps it on file and uses the information to set up your payroll correctly.

The checklist asks you to select one of three statements:

1. Statement A: This is your first job since 6 April, and you have not received any taxable benefits or state pension.
2. Statement B: This is your only or main job since 6 April, but you have had another job or received taxable benefits.
3. Statement C: You have another job or receive a state or private pension.

Your selection determines which tax code your new employer applies initially. Furthermore, the Starter Checklist requires you to declare your Student Loan status manually. You must select the exact plan type (Plan 1, Plan 2, Plan 4 for Scotland, Plan 5, or Postgraduate Loan) to prevent payroll from making incorrect deductions or missing repayments entirely. If you have a lost P45, this checklist becomes the primary tool for ensuring you are taxed correctly from day one.

Step 3: Access Your Tax Details Online Through Your Personal Tax Account

You can retrieve your tax history without needing the physical P45. Log in to your Personal Tax Account on GOV.UK or use the HMRC app. From there, you can:

• View your pay and tax details for the last five tax years
• Confirm your current tax code
• Check whether your former employer submitted your leaving details correctly to HMRC
• Print a summary of your tax history for your own records

This digital route is often faster and more reliable than trying to chase down physical documents. Many employees dealing with a lost P45 find that the information in their Personal Tax Account is sufficient to answer any questions their new employer may have.

Can You Get a Replacement P45?

The straightforward answer is no — HMRC does not issue replacement P45 forms under any circumstances. If you have a lost P45, you cannot request a duplicate from HMRC, and your former employer cannot print a brand-new original either. This is an important point because many employees waste valuable time contacting HMRC requesting a replacement, only to be told it is not possible.

Why HMRC Does Not Issue Replacements

HMRC already holds the information from your P45 electronically. When your former employer submitted Part 1 via RTI, the data was stored in HMRC's systems immediately. Because the tax authority already has the information they need, there is no administrative mechanism or process to generate a replacement physical P45. The form was designed as a one-time transfer document between parties, not a permanent record that can be reissued.

This means a lost P45 is not a problem from HMRC's perspective — they have your data. The challenge is purely about transferring the right information to your new employer, which the Starter Checklist resolves.

Alternative Ways to Recover Your Tax Information

As you can see, a lost P45 does not mean you are locked out of your tax information. The combination of your Personal Tax Account and the Starter Checklist covers everything you need to continue smoothly.

Student Loans, Self Assessment, and Agency Workers

A missing tax document can create subtle issues across specific financial scenarios. Handling these three situations correctly will keep your tax records completely accurate.

Student Loan Repayments Without a P45

Because a P45 confirms whether student loan deductions should be taken, lacking one places the responsibility on you during onboarding. On the Starter Checklist, ensure you check whether you have an active Plan 1, Plan 2, Plan 4 (Scotland), Plan 5 (undergraduate courses starting August 2023 onwards), or Postgraduate Loan. Declaring the wrong plan can cause payroll software to miscalculate your threshold, resulting in over-deductions or underpayments that HMRC will rectify later.

Filing Self Assessment (SA100) Without a P45

If you complete an annual Self Assessment tax return and cannot find a P45 from a job you left during that tax year, do not delay your filing deadline. You do not need the physical P45 document to complete your return. Log into your HMRC Personal Tax Account, navigate to your employment history for that tax year, and copy the exact "Taxable Pay" and "Tax Deducted" figures directly into the employment pages of your SA100 form.

Agency Workers and Umbrella Companies

Agency workers and contractors who switch umbrella companies frequently experience missing P45 issues. Remember that moving between end-clients while staying with the same umbrella provider does not trigger a P45. A P45 is only issued when you formally close your contract with the umbrella company itself. If you move to a new umbrella provider without a P45, complete their Starter Checklist immediately so you are not placed on emergency tax across short-term contracts.

What Happens If You Start a New Job Without a P45?

Starting a new job without a P45 is a routine occurrence that employers handle regularly. Whether you have a lost P45, your previous employer failed to issue one, or there is a delay in receiving it, the process remains the same.

Emergency Tax Codes Explained

Without a P45, your new employer may apply an emergency tax code temporarily. The most common emergency codes are:

• 1257L W1 — Week 1 basis: your tax is calculated on that week's pay only, not cumulatively across the year
• 1257L M1 — Month 1 basis: same principle, applied monthly
• 0T — No personal allowance applied; all income taxed at basic, higher, or additional rates

Emergency codes can result in you paying more tax than necessary in the short term, particularly if you have already used part of your personal allowance earlier in the tax year. However, this is temporary. Once HMRC processes your employment details via RTI and your Starter Checklist information, they will issue the correct tax code to your employer. Any overpaid tax is typically refunded through your subsequent payslips automatically.

How Your New Employer Handles a Missing P45

When you arrive without a P45, your new employer follows a standard procedure:

1. Hands you the HMRC Starter Checklist to complete on your first day
2. Uses your selected statement and Student Loan details to determine your initial tax code
3. Submits your details to HMRC via their Full Payment Submission (FPS) on or before your first payday
4. Waits for HMRC to issue the correct tax code, which replaces the emergency code
5. Adjusts your subsequent payslips to reflect the correct deductions

This process works seamlessly whether your situation involves a lost P45, a delayed P45, or a first-ever job with no P45 to begin with.

Common Reasons People End Up With a Lost P45

Understanding the most common causes can help you identify what happened and take appropriate action.

Employer Did Not Issue One

Some employers, particularly small businesses, fail to issue P45s when employment ends. This is a breach of HMRC regulations — employers are legally required to provide a P45 to every employee on their final payday. If you never received one, contact your former employer in writing and request it. If they refuse or fail to respond, you can report the issue to HMRC, who will follow up with the employer directly.

In this case, technically you do not have a lost P45 — you have a missing one. The resolution is the same: complete the Starter Checklist with your new employer.

Lost During a House Move or Life Event

The most common cause of a lost P45 is simple misplacement during a move, renovation, or life transition. Paper documents are easy to lose in boxes, folders, or recycling piles. If this happened to you, do not spend days searching — the Starter Checklist process means you can proceed without the physical document.

Left Job Abruptly and Never Collected It

If you left a job suddenly — whether due to dismissal, walking out, or mutual agreement on short notice — your employer may have processed your P45 but you may not have collected it. In this scenario, a lost P45 is really an uncollected P45. Contact the employer and ask them to confirm whether it was issued. They may be able to resend Parts 1A, 2, and 3 to you.

How to Avoid Losing Your P45 in Future

Once you have resolved your current lost P45 situation, take steps to ensure it never happens again.

Digital Storage Tips

Best practices for safeguarding your P45 and other tax documents:

• Scan or photograph your P45 Part 1A immediately upon receiving it
• Store the digital copy in a secure cloud service with two-factor authentication enabled
• Name the file clearly: "P45_EmployerName_YearLeaving.pdf"
• Email a copy to yourself as a secondary backup
• Keep the original paper copy in a dedicated folder for tax documents only

Best Practices for Keeping Tax Records

HMRC recommends retaining tax-related documents for at least six years. Keep all of the following together in one organised location:

• All P45 forms from every employer
• All P60 forms received annually
• Payslips (or digital equivalents)
• Any Self Assessment tax returns and supporting documents
• Correspondence from HMRC, including tax code notices
• P11D forms if you receive company benefits

A simple filing system — whether physical or digital — ensures you never face the frustration of a lost P45 again. Many people now rely entirely on digital storage, which eliminates the risk of physical loss entirely.