Self assessment registration: the 5 October deadline has passed, here is what to do now

Self assessment registration: the 5 October deadline has passed, here is what to do now

If you started working for yourself, took on freelance work, or began letting out a property during the 2025/26 tax year, and you have not yet told HMRC, then the 5 October 2026 registration deadline for self assessment has now passed. Take a breath. This is fixable, and you can still register today. But the missed deadline should be treated as a warning, because the next dates in the calendar carry real penalties, and the earlier you get yourself set up, the less painful the whole process will be.

You can still register now, so do it this week

If you are self-employed, you register with HMRC as a sole trader through their online service. If you need to file because of rental income or other untaxed income rather than self-employment, the SA1 form is the usual route. Either way, you will need a Government Gateway user ID, and HMRC will post you a Unique Taxpayer Reference, which can take a few weeks to arrive. That waiting time is exactly why you should not leave this until January. You cannot file a return without the UTR, and every week you delay registration is a week less to deal with the return itself.

Do not assume registration happened automatically. It is not triggered by a client or letting agent asking for your National Insurance number. Registration is a separate step, and it is your responsibility to make sure it is done.

Missing the deadline does not trigger a penalty by itself

This is the part that surprises most people. HMRC does not charge a standalone penalty just for registering late. No fine lands on 6 October because you missed the 5 October date. The danger is different: late registration eats into your preparation time, which pushes you toward the penalties that really hurt, the late filing and late payment penalties. The missed deadline is a warning, not a bill.

Your real target is 31 January 2027

For the 2025/26 tax year, 31 January 2027 is the date that matters. By that date you must file your online tax return and pay what you owe. The payment usually includes any balancing payment for 2025/26 plus, in most cases, your first payment on account toward the 2026/27 bill.

The penalties for missing this date are well established, and you are better off knowing them now than discovering them later. File late and you face an automatic 100 pound penalty, even if you owe no tax at all, with further penalties if the return stays outstanding. Pay late and interest starts running, with additional penalties charged on tax that is still unpaid after 30 days, six months and twelve months. None of this is negotiable after the fact, which is why getting registered and organised in October is worth far more than it looks.

If you already suspect the January bill will be hard to meet, do not wait until it arrives to think about it. HMRC offers Time to Pay arrangements for people who cannot pay in full, and these are much easier to set up before deadline pressure builds.

Use this as the moment to get MTD-ready

From 6 April 2027, Making Tax Digital for Income Tax brings a major change for sole traders and landlords. If your turnover is above 30,000 pounds, you will need to keep digital records, use compatible software, and send quarterly updates to HMRC instead of just filing once a year. That start date is closer than it feels.

So when you sort out your records for this year's return, do it in software that is ready for MTD rather than in a spreadsheet you will have to abandon within months. Make digital record keeping the default habit now, and the move to quarterly updates becomes a small step instead of a cliff edge. If this feels like a lot to take on while you are also registering late, the self assessment tax support team at Finex Outsourcing can help you get set up properly.

Your October action list

  1. Register for self assessment this week, online, and note roughly when your UTR should arrive.
  2. Gather your income and expense records for 2025/26 now, not in January, and start keeping digital records that will satisfy MTD.
  3. Estimate your likely tax bill early so there are no shocks, and ask about Time to Pay if the number worries you.
  4. Pick bookkeeping software that supports quarterly MTD updates, and commit to using it.
  5. If the whole thing feels overwhelming, get professional help early rather than paying penalties later.

Missed deadlines happen, and HMRC's system is built to let you recover from them, provided you move quickly. Register now, aim everything at 31 January, and set your records up for MTD at the same time. The work you do in October is what makes January calm.

Comments

Post a Comment

Popular posts from this blog

Self Assessment overpayments: how refunds and offsets work

Image
Few things feel as satisfying as discovering you have paid too much tax. Few things are as confusing as working out what happens next. If your Self Assessment account shows a credit balance, HMRC will either repay it to you or offset it against something else you owe, and which one happens is not always your choice. Here is how the system works and where people trip up. Where overpayments come from Overpayments are more common than most people expect. The biggest source is payments on account. If your bill for last year was, say, 8,000 pounds, HMRC asked you to pay 4,000 pounds in January and 4,000 pounds in July as advance payments toward this year's bill. If this year's actual bill turns out to be lower, perhaps because your income dropped, the difference sits in your account as a credit. Other common causes: CIS deductions taken by contractors at 20 or 30 per cent when your final liability is lower; income taxed at source through PAYE on a second job alongside your Sel...
Read more

Self assessment payments on account, explained simply

Image
  Every January, thousands of self-employed people get a shock when they open their HMRC statement. They expected one tax bill, but HMRC wants half of next year's bill too. These are payments on account, and once you understand the logic behind them, they are straightforward to plan for. Here is what they are, who pays them, and how to avoid the January surprise. What payments on account are Payments on account are advance payments towards your next self assessment bill. HMRC assumes that next year's tax will be roughly the same as this year's, so it collects half of the current year's liability in advance, in two instalments. It is not an extra tax. It is the same tax, paid earlier. When your actual bill for the year is finalised, the payments on account are deducted from it, and you pay or are refunded the difference. Think of it like this. If your self assessment bill for 2025/26 is 6,000 pounds, HMRC will ask for two payments on account of 3,000 pounds each towar...
Read more

Self-Assessment Countdown: Your Plan for the 31 January Deadline

Image
By John Thomas, Senior Accountant The 31 January deadline feels a long way off in October, and that is exactly why it catches so many people out. For the 2025-26 tax year, your self-assessment return must be filed and the balancing payment made by 31 January 2027. Miss it and the penalties start automatically: £100 the day after the deadline, more after three months, more after six. Add payments on account into the mix, and January becomes the most expensive month of the year for the unprepared. Here is how to plan it properly, starting now. The three things due on 31 January It helps to separate what is actually due, because people conflate them: The tax return itself. Your online self-assessment return for 2025-26 must be submitted by 31 January 2027. Paper returns had an earlier deadline of 31 October, which has now passed for this year. The balancing payment. Whatever tax you still owe for 2025-26 after PAYE, CIS deductions and payments on account must be paid by 31 January...
Read more