Know your deadlines and what you need to report

As a sole trader, you’re responsible for telling HMRC about your income and expenses. The tax year runs from 6 April to 5 April. If you started trading in the last tax year, you must register for self-assessment by 5 October following the end of that tax year. For example, if you started trading in 2023/24, you need to register by 5 October 2024.

The online filing deadline is 31 January following the end of the tax year. So for the 2023/24 tax year, your return and any tax owed are due by 31 January 2025. Paper returns are due earlier, by 31 October. Miss the deadline and you’ll face an automatic £100 penalty, even if you owe no tax. After three months, daily penalties of £10 per day start, up to a maximum of £900. There are further penalties at six and twelve months. If you pay late, interest is charged daily.

You must keep business records for at least five years after the 31 January deadline. That includes receipts, invoices, bank statements, and contracts. Cloud bookkeeping makes this effortless because everything is stored digitally and backed up.

Keep digital records from day one with cloud bookkeeping

The old shoebox of receipts is a recipe for stress. Cloud bookkeeping software lets you snap a photo of a receipt and attach it to the transaction instantly. Bank feeds pull in your income and spending automatically, so you’re not manually typing figures into a spreadsheet. This real-time approach means you always know where you stand.

HMRC accepts digital records, and if you use Making Tax Digital for Income Tax (coming into force for many sole traders from April 2026), digital records will be mandatory. Starting now with cloud bookkeeping puts you ahead of the curve. Look for software that lets you:

• Capture receipts on your phone and store them securely
• Connect your business bank account for automatic imports
• Categorise transactions with a few taps, splitting personal and business spending
• Generate profit and loss reports at any time
• Add notes to explain unusual items, which helps if HMRC asks questions

Spend ten minutes each week reconciling your books. That tiny habit saves hours when the tax return is due.

Claim every allowable expense – but only what you’re entitled to

Claiming expenses reduces your taxable profit, so it’s worth getting right. Common allowable expenses for sole traders include:

• Office supplies, stationery, and postage
• Business phone calls and internet – claim the business proportion if the line is also used personally
• Travel for business, including mileage if you use your own vehicle. HMRC’s simplified mileage rates are 45p per mile for the first 10,000 miles, then 25p per mile
• Protective clothing and uniforms
• Professional fees, such as accountancy or legal costs
• Software subscriptions and cloud bookkeeping fees
• Bank charges on your business account
• Advertising and marketing

You cannot claim personal expenses, client entertainment, or fines (for example, parking tickets). If you work from home, you can use simplified expenses – a flat rate based on hours worked – or claim a reasonable proportion of household bills. The trading allowance lets you earn up to £1,000 tax-free without claiming expenses, but if your expenses exceed that, claiming them is usually better.

Cloud bookkeeping helps here because you can tag expenses to categories as they happen. At year-end, your software produces a tidy summary you can transfer to your tax return.

Understand payments on account and budget for your tax bill

If your tax bill exceeds £1,000, HMRC will ask for payments on account. These are advance payments towards next year’s tax. Each payment is half of your previous year’s bill, due by 31 January and 31 July. This catches many sole traders off guard, especially in the first profitable year.

Cloud bookkeeping lets you see your profit in real time, so you can set aside a percentage each month. A simple rule: put 20–30% of every payment you receive into a separate tax savings account. When the bill arrives, the money is ready. Your software can also run a year-to-date profit report, helping you estimate what you’ll owe.

File early, check twice, and avoid common mistakes

Don’t leave your return to the last week of January. HMRC’s system gets busy, and you might hit technical problems. Aim to file by early December. Common errors include:

• Forgetting to include all income, including cash jobs, interest, or dividends
• Claiming expenses you can’t prove – keep digital receipts
• Using the wrong accounting date or tax year
• Mixing up payments on account with the tax owed
• Entering figures in the wrong boxes

Cloud bookkeeping reduces these risks because your figures come from reconciled bank data. Double-check your bank details before submitting. After filing, save a copy of the submission receipt. If you cannot pay on time, contact HMRC before the deadline to set up a payment plan – it’s far better than ignoring the problem.

Make cloud bookkeeping a year-round habit

Your tax return shouldn’t be a once-a-year panic. With cloud bookkeeping, you’re doing a little often. Review your profit monthly, adjust your tax savings, and keep receipts digital. Set a calendar reminder for 5 October (registration) and 31 January (filing and payment). As a sole trader, your time is better spent on your business, not on chasing paperwork. A simple cloud system turns tax preparation from a dreaded chore into a calm, predictable routine.