Can I amend my Self Assessment after submitting?

You’ve submitted your Self Assessment tax return already and life is good… until you realise you’ve made a mistake and need to change something 😱

Not to worry, here’s how you can amend your tax return👇

Why would you need to make an amendment to your Self Assessment? 

Amending your tax return can result in you receiving a tax refund or owing HMRC more in tax.

If you do need to make any amendments, you have to wait at least 3 days from when you filed to do so.

Since you’re trying to correct the mistake before HMRC contacts you about it, you might be able to avoid penalties for an incorrect tax return🤞

First, you need to figure out how long it’s been since the filing deadline for the tax return you want to amend.  That’s 31st January, in case you’ve wiped it from your memory already (we wouldn’t blame you)🥲

If your year is up, then you have to request the amendment a different way.

Amending within 12 months of the Self Assessment deadline

You can amend your Self Assessment without too much fuss if it’s been less than 12 months since the deadline🎉

With HMRC

If you filed through HMRC, you can log into your tax account. 

Click on:

1. “Self Assessment account”
2. “More Self Assessment details”
3. “At a glance”, on the left
4. “Tax return options”
5. The tax year you want to make amends for 
6. The tax return you’re amending

Make the changes to your online tax return and file it again. 

With TaxScouts

If you’re with TaxScouts, it’s simple. Just log in, let your accountant know and they’ll handle everything. Easy, as usual🤩

Amending more than 12 months from the Self Assessment deadline

If you need to make an amendment to a tax return that was filed over a year ago, the process is a little different.

Regardless of who filed your tax return for you, you’ll need to send your amendments to HMRC in writing yourself. That’s right, good old post😨

Address:

Self Assessment

HM Revenue and Customs

BX9 1AS

United Kingdom

There’s a different address for couriers.

You can claim a tax refund from up to 4 years after the year the tax return was filed for. But fair warning, HMRC does have the right to reject any amendments made after the 12-month deadline (even if they were made by paper).

How do you write to HMRC to amend your tax return?

This is the only option if you:

1. Filed a paper return originally and need to make an amendment
2. Need to make an amendment and it’s been more than 12 months since the deadline

Will there be any changes to your tax bill?

Yep, more than likely if you know there was a mistake, your tax bill will change.

Online

 If you amended it online with HMRC, then your bill is changed straight away. Within 3 days you should be able to see if you owe more tax or are owed a refund.

If you owe tax, you’ll see the new deadline to pay your new tax bill by, any payments on account you need to make, and if you owe HMRC any penalty interest fees.

On the other hand, if you’re owed money, click on “Request repayment” on your HMRC online account. 

It usually takes about 4 weeks for the refund to reach your account. 

Paper

HMRC will send you an updated bill within 4 weeks with more instructions on what to do. As long as you’ve included your bank details in your amended tax return, they’ll send any owed money directly to your bank account.