UK Sole Trader Tax Deadlines 2025/26 and 2026/27

The 2025/26 tax year runs from 6 April 2025 to 5 April 2026. As a sole trader, the most critical deadline is 31 January 2027, by which you must file your online Self Assessment return and pay any tax owed. Missing this date triggers automatic penalties and interest charges that can quickly add up.\n\nBefore the filing deadline, there are other important dates to note. If you became self-employed for the first time during the 2025/26 tax year, you must register with HMRC for Self Assessment by 5 October 2026. This gives you time to receive your UTR number and set up your Government Gateway account before the filing window opens.\n\nIf you filed a 2024/25 return and had payments on account set up, your second payment on account for 2024/25 was due on 31 July 2025. Your first payment on account for 2025/26 was due alongside your 2024/25 balancing payment on 31 January 2026, and the second payment on account for 2025/26 is due on 31 July 2026.\n\nFor VAT-registered sole traders, quarterly VAT returns are due one month and seven days after the end of each VAT quarter. The exact dates depend on your VAT stagger group. If you are on the standard quarterly scheme, your VAT quarters might end on 31 March, 30 June, 30 September, and 31 December, with returns and payments due by 7 May, 7 August, 7 November, and 7 February respectively.

Planning ahead for the 2026/27 tax year (6 April 2026 to 5 April 2027) is especially important because Making Tax Digital for Income Tax Self Assessment begins for sole traders with income above 50,000 pounds from April 2026. This means quarterly digital updates to HMRC become mandatory for higher-earning sole traders, adding new deadlines throughout the year.\n\nFor those within the MTD ITSA regime, you will need to submit quarterly updates using compatible software within one month of the end of each quarter. The quarters are fixed as April to June, July to September, October to December, and January to March, with submission deadlines of 7 August, 7 November, 7 February, and 7 May respectively. An End of Period Statement is due by 31 January 2028 alongside your final declaration.\n\nThe standard Self Assessment deadline for the 2026/27 tax year remains 31 January 2028 for online filing and 31 October 2027 for paper. Your first payment on account for 2026/27 is due on 31 January 2027, and the second is due on 31 July 2027. These overlap with your 2025/26 filing obligations, so January 2027 is a particularly expensive month for sole traders.\n\nFrom April 2027, MTD ITSA extends to sole traders with income above 30,000 pounds, bringing more tradespeople into the quarterly reporting regime. If your income is near these thresholds, it is worth understanding the requirements early so you can set up compatible software and processes before the obligations begin.

HMRC operates a tiered penalty system for late Self Assessment returns. An immediate 100 pound fixed penalty applies if your return is even one day late. After three months, daily penalties of 10 pounds per day accrue for up to 90 days, totalling a potential 900 pounds. At six months, a penalty of 5 percent of the tax due or 300 pounds, whichever is greater, is charged. At twelve months late, a further 5 percent or 300 pounds is added, and HMRC may impose higher penalties of up to 100 percent of the tax due if they believe information is deliberately withheld.\n\nLate payment penalties operate separately. Interest starts accruing from the day after the payment due date at the HMRC interest rate, currently the Bank of England base rate plus 2.5 percent. A 5 percent surcharge is applied to tax remaining unpaid 30 days after the due date, with further 5 percent surcharges at six months and twelve months.\n\nFor Making Tax Digital quarterly updates, HMRC has confirmed a points-based penalty system. Each late quarterly submission earns a penalty point, and once you reach a threshold of four points, a 200 pound penalty is charged for each subsequent late submission. Points expire after a period of compliance. Late payment penalties under MTD follow a similar tiered structure to Self Assessment.\n\nThe combination of filing and payment penalties can be severe. A tradesperson who fails to file for a year and owes 5,000 pounds in tax could face total penalties and interest exceeding 2,000 pounds on top of the original tax bill. TradeTally sends automatic reminders ahead of all key deadlines to help you avoid these costs entirely.

The biggest financial shock for newly self-employed tradespeople is the payment on account system. In January of your second year of Self Assessment, you must pay your full first-year tax bill plus 50 percent of that amount as an advance towards year two. For a tradesperson with 40,000 pounds of taxable profit, this could mean a January payment exceeding 10,000 pounds.\n\nThe most effective strategy is to set aside money for tax as you earn it. Calculate a percentage of your invoiced income to transfer to a separate savings account each week or month. For most sole traders paying basic rate tax and National Insurance, setting aside 25 to 30 percent of net profit provides adequate coverage. If you are a higher-rate taxpayer, aim for 35 to 40 percent.\n\nTradeTally includes a real-time tax estimate feature that tracks your running profit and calculates your projected tax liability and payments on account. This updates automatically as you add invoices and expenses, so you always know how much you should have set aside. The app can also calculate how much to transfer to your tax savings account each month.\n\nIf you find yourself unable to pay on time, contact HMRC before the deadline to arrange a Time to Pay plan. This spreads your liability over up to twelve monthly instalments. While interest still accrues, you avoid the late payment surcharges. HMRC is more likely to agree to a plan if you approach them proactively and have a reasonable payment proposal.