Paper tax return deadline is 31 October 2026: why filing online buys you three more months

Published 9 October 2026.

If you send your Self Assessment tax return on paper, HMRC must receive it by 11:59pm on 31 October 2026. That is the deadline for the 2025/26 tax year, the one that ran from 6 April 2025 to 5 April 2026, and it falls three months earlier than the online deadline most people have in their heads.

For a new freelancer the useful news is not the date itself. It is that the paper deadline only binds you if you insist on paper.

The deadline belongs to the method, not to you

There are two filing deadlines for the same return, and which one applies depends on how you send it:

How you file	Deadline for 2025/26
Paper return (form SA100)	11:59pm on 31 October 2026
Online return	11:59pm on 31 January 2027

Nothing ties you to the route you first thought of. If you planned to file on paper and you are not going to make 31 October, you can file online by 31 January 2027 instead and the return is on time. HMRC's own Self Assessment manual says as much about someone who posted a paper return late: had they filed online, they would have avoided the penalties.

What you cannot do is post a paper return in November and expect the January date to cover it. A paper return that arrives on 1 November is late, and HMRC's manual is blunt that no concession is allowed.

31 October is a Saturday, and "receive" means receive

Two details catch people every year.

HMRC has to have the return by the deadline. Posting it on the 31st does not count. The test is when it arrives, not when it leaves your hands.

This year 31 October falls on a Saturday. If you are posting a return, the realistic cut-off is several days earlier, and proof of postage is worth the trip to the counter.

If the form is not already filled in and you are reading this in the last week of October, paper has probably stopped being the sensible route.

What a late paper return costs

The late filing penalties are the same whichever way you file. What changes is when the clock starts, and on paper it starts three months sooner.

• An initial £100 penalty, as soon as the return is late. It applies even if you owe no tax, or are due a refund.
• After 3 months, £10 a day, up to a maximum of £900. For a paper return that runs from 1 February 2027.
• After 6 months, a further 5% of the tax due or £300, whichever is greater.
• After 12 months, another 5% or £300, whichever is greater.

So a paper return posted in mid November costs £100 for arriving a fortnight late, while the same figures typed into the online service on the same day cost nothing. That is the whole argument for switching.

If you have a reasonable excuse for a late return, you can appeal against the penalty.

Filing is not paying

Neither deadline moves the payment date. Whichever way you file, the tax you owe for 2025/26 is due by 11:59pm on 31 January 2027.

Late payment is charged separately from late filing: 5% of the unpaid tax at 30 days, 6 months and 12 months, plus interest, currently 7.75%. That rate has applied since 9 January 2026 and is set at the Bank of England base rate plus 4%.

One reason to file early if you also have a job

If you are employed as well as freelancing, you can ask HMRC to collect what you owe through your PAYE tax code over the following year instead of paying it in one go. All three of these have to be true:

• you owe less than £3,000 on the bill, and you cannot make a part payment to get under that figure
• you already pay tax through PAYE, for example as an employee or on a company pension
• you sent your paper return by 31 October, or your online return by 30 December

HMRC will not do it if you do not have enough PAYE income to collect from, if it would take more than half of that income in tax, or if you would end up paying more than twice as much tax as you normally do.

For someone freelancing on the side of a salary, 30 December 2026 is the date to aim for online. It spreads the bill across twelve pay packets rather than landing it all on 31 January.

Why online is the easier route for a first return

If 2025/26 was your first year freelancing, there is very little case for paper.

• Three more months. 31 January rather than 31 October.
• The sums are done for you. The online service calculates what you owe as you go. On paper you are waiting for HMRC to work it out and tell you.
• You can still get the form if you want it. GOV.UK lets you download the SA100, or you can call HMRC and ask for one to be sent.

A few people cannot use HMRC's own online service and need commercial software instead, including partnerships, trusts, non-residents and ministers of religion. Trustees of registered pension schemes file on paper and have until 31 January 2027.

Either way you need a Unique Taxpayer Reference before you can file anything. If you have not registered for Self Assessment yet, that deadline was 5 October and it has passed, but it is recoverable. See what the 5 October registration deadline covered, and what happens if you missed it.

The dates still to come

Date	What is due
31 October 2026	Paper tax return for 2025/26
7 November 2026	Second Making Tax Digital quarterly update, if MTD applies to you
30 December 2026	Online return, if you want the tax collected through your tax code
31 January 2027	Online tax return, plus payment of what you owe
31 July 2027	Second payment on account, if you make them

If Making Tax Digital applies to you, with qualifying income over £50,000, the quarterly updates run alongside all of this and do not replace the 2025/26 return. We covered the 7 November quarterly update and the summer deadlines before it separately.

What to do now

1. If your paper return is ready, post it now with proof of postage. Do not leave it for the last week.
2. If it is not ready, stop treating 31 October as your deadline. Set up the online service and file by 31 January 2027 instead.
3. If you have a job as well, aim for 30 December online, so a bill under £3,000 can come out of your tax code.
4. Start setting the money aside now, whichever route you take. Our guide to managing your freelance finances and taxes covers what to put by and what you can claim.
5. If you are still getting set up, the freelance startup checklist covers the rest of the paperwork.

This is general information, not tax advice. Figures and deadlines are correct as at 9 October 2026. Check GOV.UK or speak to an accountant about your own position.

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