Self assessment deadlines

Avoid late payment and filing penalties by sticking to the self assessment deadlines.

6/4 Start of tax year
31/10 Deadline for paper returns
31/1 Deadline for online returns

First payment on account
Payment date for interim payment of half of your tax estimate for current tax year

Balancing payment
Payment date for any outstanding tax from previous tax year
5/4 † End of tax year
31/7
Second payment on account
Payment date for interim payment of second half of your tax estimate for current tax year

† Note if your accounting year ends 31/3 then this will be treated as coincident with the end of the tax year.
For more detail see HMRC: Tax return deadlines and penalties.

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