30 December 2023 is the deadline for submitting 2022/23 self-assessment tax returns online if the taxpayer wishes to avail of coding out for tax debt of less than £3,000.
You can pay your self-assessment bill through your PAYE tax code (known as coding out) if all of the following apply:-
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you owe less than £3,000 on your tax bill;
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you already pay tax through PAYE, for example you’re an employee or get a company pension; and
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you submit your paper tax return by 31 October or your online tax return online by 30 December.