WHAT IS A P800 FORM?

A P800 is an official tax calculation letter issued by HM Revenue & Customs (HMRC). It is not a form you complete. Instead, HMRC sends it after reviewing your Pay As You Earn (PAYE) tax records at the end of a tax year.

The P800 compares:

The Income Tax you actually paid through PAYE
The amount of tax HMRC believes you should have paid

If there is a difference, HMRC will tell you whether:

You are due a tax refund, or
You owe additional tax.

A P800 only relates to Income Tax for employees and pensioners. It does not apply to Capital Gains Tax, National Insurance, or Self Assessment.

WHAT DOES A P800 SHOW?

Your P800 tax calculation contains important information about your tax position for the year.

It typically includes:

Total employment income
Pension income (if applicable)
Taxable state benefits
Personal Allowance used
Benefits in kind reported on a P11D
Tax reliefs already claimed
Income Tax deducted through PAYE
HMRC’s tax calculation
The amount overpaid or underpaid

Review each figure carefully before taking action.

WHY HAVE I RECEIVED A P800?

Receiving a P800 usually means HMRC identified a difference between the tax you paid and the tax you should have paid.

Common reasons include:

Reason Explanation
Emergency tax code You started a job without a P45.
Multiple jobs Personal Allowance may have been applied incorrectly.
Pension and employment Income from multiple sources created a tax difference.
Leaving work during the year Too much PAYE may have been deducted.
Unclaimed work expenses Tax relief wasn’t claimed during the year.
Income changed Your earnings were lower than originally estimated.
Late tax code updates HMRC corrected your code after deductions had already been made.
Taxable state benefits Benefits affected your final tax calculation.

Most P800 letters are routine and do not indicate any wrongdoing.

HOW TO CLAIM YOUR P800 TAX REFUND ONLINE

If your P800 states that you can claim online, HMRC now requires you to actively request the refund.

Automatic repayments are no longer issued in most cases.

Step 1

Locate the 10-digit reference number shown on your P800 letter.

Step 2

Visit the official HMRC refund service.

Step 3

Sign in using your Government Gateway account.

Step 4

Confirm your:

• National Insurance number
• Income details
• Personal information

Step 5

Enter your UK bank account details.

Step 6

Submit the claim.

Step 7

Save the confirmation reference.

Online refunds normally arrive within five working days.

CLAIM YOUR REFUND USING THE HMRC APP

You can also claim through the official HMRC app.

Simply:

Log in
Open your Personal Tax Account
Follow the refund instructions

Processing times are generally the same as online claims.

AUTOMATIC CHEQUE REFUNDS

Some P800 letters state that HMRC will automatically send a cheque.

If this applies:

No further action is required.
The cheque normally arrives within 14 days.

Where refunds relate to multiple tax years, HMRC usually issues one combined cheque.

CLAIMING BY TELEPHONE

If you cannot claim online, contact HMRC directly.

Before calling, have ready:

National Insurance number
P800 reference
Personal details

HMRC may arrange payment by cheque.

P800 REFUND TIMESCALES
Claim Method Typical Timescale
Online Around 5 working days
HMRC App Around 5 working days
Automatic cheque Within 14 days
Telephone request Up to 6 weeks

Busy periods may increase processing times.

WHAT IF YOUR P800 SHOWS YOU OWE TAX?

Not every P800 results in a refund.

Sometimes HMRC determines you have underpaid Income Tax.

This normally happens because:

Your employer deducted insufficient PAYE.
Your tax code was incorrect.
Your income changed during the year.

Generally, HMRC collects the outstanding amount through your future tax code rather than demanding immediate payment.

HOW FAR BACK CAN YOU CLAIM A P800 REFUND?

HMRC allows taxpayers to claim refunds for up to four previous tax years.

Current deadlines are:

Tax Year Claim Deadline
2021/22 5 April 2026
2022/23 5 April 2027
2023/24 5 April 2028
2024/25 5 April 2029

If you believe you’re owed money but have not received a P800, you can still contact HMRC and request a repayment.

WHAT SHOULD YOU DO IF YOUR P800 IS WRONG?

Mistakes occasionally happen.

Compare your P800 against:

Payslips
P60
P45
P11D

Common causes include:

Incorrect employer submissions
Missing tax reliefs
Incorrect benefits
Income allocated to the wrong tax year

If anything appears incorrect, contact HMRC immediately with supporting evidence.

CHECK YOUR TAX CODE

Many P800 calculations result from incorrect tax codes.

Log into your HMRC Personal Tax Account to review both your current and historic tax codes.

Common codes include:

1257L
1257L W1
1257L M1
BR
0T

Checking your code early can prevent future tax issues.

P800 VS P60

Many taxpayers confuse these two documents.

Feature P800 P60
Issued by HMRC Employer
Purpose Tax calculation Annual pay summary
Shows refund? Yes No
Issued after year-end Yes Yes
Action required Usually No

Your P60 confirms what you earned.

Your P800 confirms whether you paid the correct amount of tax.

HOW TO SPOT A P800 SCAM

Scammers frequently impersonate HMRC.

Remember:

HMRC will never:

Send refund links by text message.
Request bank details by email.
Ask for payment using gift cards.
Threaten arrest via text or email.
Request cryptocurrency payments.

Always verify communications through your HMRC Personal Tax Account.

CAN SELF-EMPLOYED PEOPLE RECEIVE A P800?

Generally, no.

P800 letters are issued only to:

Employees
Pensioners

Self-employed individuals usually receive refunds through their Self Assessment tax return instead.

If you have both PAYE employment and self-employment income, you may still receive a P800 relating to your PAYE earnings.

I HAVEN’T RECEIVED A P800. CAN I STILL CLAIM A REFUND?

Yes.

Not receiving a P800 does not automatically mean you have paid the correct amount of tax.

You can:

Check your Personal Tax Account
Contact HMRC
Submit a repayment claim

If you believe you overpaid tax, do not wait for HMRC to contact you.

CAN YOU RECEIVE MORE THAN ONE P800?

Yes.

HMRC sometimes reviews several tax years simultaneously.

If this happens:

You may receive multiple P800 letters.
Each relates to a separate tax year.
Refunds are often combined into one payment.

FREQUENTLY ASKED QUESTIONS

WHAT IS A P800 FORM?

A P800 is HMRC’s official tax calculation showing whether you have overpaid or underpaid Income Tax through PAYE.

HOW DO I CLAIM MY P800 REFUND?

Claim online using your Government Gateway account or the HMRC app.

If eligible, refunds normally arrive within five working days.

HOW LONG DOES A P800 REFUND TAKE?

Typical processing times are:

Online: Five working days
HMRC App: Five working days
Automatic cheque: Around 14 days
Telephone request: Up to six weeks

WHAT IF MY P800 SHOWS I OWE TAX?

HMRC usually collects the amount by adjusting your future tax code.

If you cannot pay, contact HMRC to discuss payment options.

WHAT IS THE DIFFERENCE BETWEEN A P800 AND A P60?

A P60 records your annual earnings and tax deductions.

A P800 compares those figures with HMRC’s calculations to determine whether you owe tax or are due a refund.

CAN SELF-EMPLOYED PEOPLE RECEIVE A P800?

Normally, no.

Self-employed taxpayers reconcile tax through Self Assessment.

HOW FAR BACK CAN I CLAIM A P800 REFUND?

You can usually claim refunds for the previous four tax years, subject to HMRC’s deadlines.

WHAT SHOULD I DO IF MY P800 IS INCORRECT?

Compare it with your P60, payslips and other tax records.

If you find an error, contact HMRC with supporting evidence as soon as possible.

IS A P800 REFUND EMAIL OR TEXT MESSAGE GENUINE?

No.

HMRC does not send P800 refund links by email, SMS, WhatsApp or social media.

Always access your refund through your official HMRC Personal Tax Account.

WHAT HAPPENS IF I DON’T CLAIM MY P800 REFUND?

If your letter requires you to claim online and you do nothing, the money remains unclaimed until the claim deadline expires.

Claim your refund promptly to avoid losing your entitlement.

WHAT IS A P800 FORM AND WHY HAVE YOU RECEIVED ONE?

A P800 Form is an official tax calculation issued by HM Revenue & Customs (HMRC) to employees and pensioners who pay tax through the Pay As You Earn (PAYE) system. Although many people search online for a P800 Form, it is actually a tax calculation letter rather than a form you need to complete.

The purpose of the P800 Form is to compare the Income Tax you paid during a tax year with the amount HMRC believes you should have paid. If there is a difference, the P800 will explain whether you are entitled to a tax refund or whether you have underpaid tax.

Receiving a P800 Form does not automatically mean something has gone wrong. In many cases, it simply reflects changes in employment, tax codes, pensions, or income during the tax year.

HOW DOES A P800 FORM WORK?

The P800 Form is generated after HMRC reviews information submitted by employers, pension providers, and other income sources.

HMRC compares:

• Your total taxable income
• Your Personal Allowance
• Tax deducted through PAYE
• Taxable benefits
• Any tax reliefs claimed

Once HMRC completes its review, it issues a P800 Form if you have either paid too much or too little Income Tax.

The P800 Form clearly shows how HMRC reached its calculation, allowing you to check every figure before claiming a refund or paying any outstanding tax.