[Updated 1 February 2026]: If you missed the 31 January deadline to submit your self-assessment tax return, you are now into the penalty stage. HMRC applies an automatic £100 penalty to those who are anywhere from 1 day to 3 months late. Further penalties are then added if you take even longer to comply. It's even worse if you haven't paid the tax owed to HMRC by 31 January because you'll then owe interest on that too. Here's our professional advice of what to do if you're late...

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With the self-assessment tax return deadline almost upon us, we are opening our Tulse Hill office* this Sunday, 25 January 2026, from 10 am to 5 pm by appointment. That's in addition to Saturdays, which will remain open, by appointment, for the remainder of January (9 am-5 pm on 24 January) and, of course, weekdays opening hours as usual (see footer). A weekend appointment may be the perfect opportunity to discuss your tax return with us or bring in figures and records without having to disturb your working week. Weekend time slots are limited, though, so please book a free 20-minute appointment as soon as possible if you'd like to visit.

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[Updated November 2025]: If you're self-employed in the UK and earn more than £1,000 after allowable deductions, you need to file a self-assessment tax return each year. It's not only the self-employed, though. If you are on a higher income* or receive untaxed income from things like property rental, tips, commission, savings, investments, dividends, or foreign income, you also have to submit a return. Partners in business partnerships and those who made a capital gain resulting in Capital Gains Tax (CGT) also need to submit a return.

If you do have to fill in a self-assessment tax return, getting all the tax return fields filled in properly and the figures right can sometimes be difficult. That's where professional help from companies like Taxfile is worth its weight in gold. But what information will your accountant or tax advisor need from you? In today's guide, we'll explain exactly what you'll need to supply.

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While the transition to the new basis period has introduced certain complexities, it also presents opportunities for businesses to manage their tax liabilities more effectively. One such opportunity lies in the spreading of tax arising from transitional profits.

Transitional profits refer to the profits that arise from the transition between the old and new basis periods. These profits can be spread over

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HMRC issues tax returns each year to those who meet the criteria; you may be self-employed or a higher earner from employment income. The tax return software available online will calculate your tax liability if you fancy giving it a try yourself. However, most people use accountants and tax advisors who might, in their wisdom, be able to save you money and in some circumstances give you guidance and good advice. Indeed, Taxfile can help in all these areas and we explore this in today’s article.

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