Underpaid tax...

Flowrida

Hi, it appears that for the last financial year I underpaid tax and now have received a payment request.  I have hunted high and low and cannot find an answer to what I think is  a relatively easy question. How long do I have to pay the owed tax before the tax office add interest? They've taken 4 months to tell me I had underpaid, so can I wait a couple of months before I pay them?  Will I get a reminder to pay or just an increased amount to pay!  Any guidance gratefully accepted.

Dazed_and_C0nfused

Is this tax owed under Simple Assessment or Self Assessment?

Ayr_Rage

What event caused this extra tax to be due ?
Did you file a Self Assessment tax form ?
If so, your online Government Gateway account will show when the tax is due.

Flowrida

Thanks for the response.  It's tax due on the state pension.  I logged on to the gateway the same day I got the notification, 14 July ,and the message was "due by 14 July" !

Dazed_and_C0nfused

Flowrida said:

Thanks for the response.  It's tax due on the state pension.  I logged on to the gateway the same day I got the notification, 14 July ,and the message was "due by 14 July" !

Which tax year is the tax due for?

If it is for 2022-23 then the earliest you should have to pay it by is 31 January 2024.

Flowrida

it is for 2022/23 - thank you!

Dazed_and_C0nfused

LITRG have some useful info here.

https://www.litrg.org.uk/tax-guides/tax-basics/what-simple-assessment

And the official info here,

https://www.gov.uk/hmrc-internal-manuals/paye-manual/paye96301

Bit more complicated for earlier tax years but for the last one that has ended you shouldn't need to pay until 31 January 2024.