Back
Let us sort your Self Assessment today. Stress-free. For £119, all in. Learn more

The P800 form: what to do if HMRC sent you one

A P800 form, also known as a tax calculation, is a letter that HMRC will send you when they think that you have not paid the right amount of tax:

  • either too little
  • or too much tax.

What if I think that my P800 form is wrong?

It can happen – P800s aren’t always correct.

What you need to do:

  1. Compare it with your P60P45, and P11D forms
  2. Check that HMRC included your flat rate job expenses (uniform laundry allowance, etc.)
  3. Check that HMRC also included your regular job expenses (mileage allowances, professional subscription fees, parking fees, business phone call, travel and overnight costs, etc.)
  4. Also check for adjustments like the married couples’ allowance, etc.

What can happen:

  • your P800 is correct – you don’t need to do anything
  • you overpaid tax – HMRC will refund you within 4 weeks
  • you underpaid tax, but it’s less than £3,000 – HMRC will collect the tax directly through your tax code
  • or you underpaid tax, and it’s more than £3,000 – HMRC will contact you about a special repayment schedule.

It says I can get a tax refund. How do I get it?

Online

What you need to do:

  1. Go to the HMRC website
  2. Sign in to your Personal Tax Account using your Government Gateway User ID
  3. Follow the steps to request a refund.

Once you finished, you should receive the rebate to your bank account in about 5 days.

By phone

You can also call HMRC on 0300 200 3300.

Wait for a cheque

If you don’t do anything, HMRC will send you a cheque within 14-45 days from the date on your P800.

What if my P800 says I owe tax?

HMRC will either collect it through your PAYE tax code or ask you to pay directly.

What if I have P800s from multiple years?

Each form includes the previous years, so you only need the one from the final year.

I didn’t get one. Can I still claim a tax refund?

Short answer: yes.

You could still be owed tax from expenses that the HMRC doesn’t know about.

For example, if you work in construction, you might want to claim the mileage allowance.

Let us know if you need help.

Hey there! We really hope this article helped you. Tax matters can be a dreadful topic at times. We know. That's why we started TaxScouts.
A stress-free way to getting your taxes done.

Have a minute? See how it works

More guides & useful information

Let us sort your Self Assessment online. £119, all in.

That’s right. No matter how complicated it gets or why you need to do a return in the first place, it’ll cost £119 to get it done. That includes VAT, last-minute changes and all the support you may need.

How it works

1. Answer a few simple questions

And we mean a few. After a couple of minutes of answering questions online we’ll have everything we need to start working on your tax return.

2. Then get paired with a tax accountant

That’s right, you’ll be matched with a real accountant who is best suited to prepare your return. Plus, they’re on hand for questions whenever you need.

3. We file your Self Assessment for you

Once you’ve signed off your return, your TaxScouts accountant will file your return online with HMRC. That’s it! We told you it was simple.