Accounting Software for Sole Traders That Does the Work for You

If you are a sole trader, the books are the part of running your business that you almost certainly did not start the business to do. You set out to do the work you are good at: the plumbing, the design, the tutoring, the consulting, the deliveries. Instead you end up with a glovebox full of receipts, a current account that mixes a client payment with the weekly shop, and a slow, creeping dread every time someone mentions the 31 January Self Assessment deadline.

You are not alone. There are roughly 3.1 million sole traders in the UK, and the vast majority do their own books on a spreadsheet, in a shoebox, or in their head. That works right up until it does not: until the receipt you needed has faded to a blank slip, until you realise in January that you have no idea what you actually spent, or until HMRC sends a letter you do not understand. The job to be done is simple to say and hard to do: keep accurate records, claim everything you are entitled to, and file on time without the panic.

This guide explains what sole trader accounting actually involves in 2026, the deadlines and tax rules that apply to you, what you can claim, and how AccountsOS, the AI-native accounting platform, takes the whole thing off your plate. The short version: you snap or forward a receipt, you ask questions in plain English, and your accountant, Finn, keeps your figures ready so filing is a review and a click, not a weekend lost to dread.

What is a sole trader, and what do you actually have to do?

A sole trader is the simplest way to be self-employed in the UK. You and your business are legally the same person: you keep all the profits after tax, but you are also personally responsible for any debts. There is no Companies House registration, no annual accounts to file publicly, and no corporation tax. In exchange for that simplicity, you carry three core obligations.

First, register as self-employed. You must tell HMRC you are trading by 5 October following the end of the tax year in which you started. So if you began trading in, say, July 2025 (the 2025/26 tax year), you must register by 5 October 2026. Registration gives you a Unique Taxpayer Reference (UTR) and enrols you for Self Assessment.

Second, keep records. You must keep a record of all your business income and expenses, and hold supporting evidence (invoices, receipts, bank statements) for at least five years after the 31 January submission deadline of the relevant tax year. This is the bit that quietly grows into a problem, because life happens between the receipt and the filing.

Third, file a Self Assessment tax return and pay your tax. Once a year you report your income and expenses, HMRC calculates the tax and National Insurance you owe, and you pay it. From April 2026, Making Tax Digital changes the rhythm of this for higher earners, replacing the single annual return with quarterly updates. More on that below.

None of these are optional, and none of them care that you were busy. That is exactly why software that does the work in the background, rather than waiting for you to sit down and do data entry, matters so much for sole traders specifically.

The five things sole traders actually dread, and how AccountsOS solves each

Every sole trader recognises the same handful of pain points. Here is each one, and the specific AccountsOS feature that makes it disappear.

The thread running through all of these: the work happens when it is easy (the moment you get a receipt, the moment you have a question), not in a single dreaded session months later when the context is gone. That is the difference between accounting software that gives you forms and an AI accountant built for the self-employed that does the work for you.

What expenses can a sole trader claim?

The single biggest reason sole traders overpay tax is that they do not claim everything they are entitled to. The rule is that an expense must be incurred wholly and exclusively for your business. If something is part business and part personal, you can usually claim the business proportion. Here are the most common allowable expense categories for the self-employed, with worked examples.

A worked example. Say you are a self-employed photographer with £48,000 of income. You drive 8,000 business miles (£3,600), spend £1,200 on a laptop, £216 on editing software, £140 on insurance, £720 on advertising, and claim the £120 home-office flat rate for the year. That is £5,996 of allowable expenses. At a 20% basic rate plus 6% Class 4 National Insurance, claiming those expenses saves you roughly £1,559 in tax and NI compared with claiming nothing. Most of that saving evaporates in practice simply because people lose the receipts or never realise the expense was claimable. Capturing the receipt the moment you get it, and being able to ask whether something counts, is worth real money.

There is also the £1,000 trading allowance. If your total self-employed income for the year is under £1,000 you do not need to register or file at all. If it is over £1,000 but your expenses are low, you can choose to deduct the flat £1,000 allowance instead of your actual expenses, whichever leaves you better off. AccountsOS works out which is more favourable for you. For the full detail, see our business expenses guide.

How is a sole trader taxed? Income tax and National Insurance explained

As a sole trader you pay income tax and National Insurance on your profit, which is your income minus your allowable expenses, not on your turnover. For the 2025/26 tax year the personal allowance is £12,570, meaning your first £12,570 of profit is tax-free (subject to your total income). Above that, the standard income tax bands apply.

On top of income tax, the self-employed pay National Insurance. Class 4 National Insurance is charged on profits between £12,570 and £50,270 at 6%, and at 2% on profits above £50,270. Class 2 National Insurance is no longer a separate flat charge for most people: since April 2024, sole traders with profits above the small profits threshold are treated as having paid it (so they keep their entitlement to the State Pension and benefits) without an actual Class 2 bill. If your profits are below the threshold, you can pay Class 2 voluntarily to protect your contributions record.

Worked example. A sole trader with £40,000 of profit in 2025/26 would pay roughly £5,486 in income tax (20% on the slice above the personal allowance) and around £1,646 in Class 4 NI (6% on the slice between £12,570 and £40,000), a total of about £7,132. Every £1,000 of genuine expenses you remember to claim knocks roughly £260 off that bill. Finn keeps a running estimate of what you owe as the year goes on, so the January number is never a shock.

When is the Self Assessment deadline, and what are payments on account?

The UK tax year runs from 6 April to 5 April. Self Assessment has a fixed calendar of deadlines, and HMRC charges an automatic £100 penalty the moment you miss the filing date, with further penalties and interest stacking up after that. Here are the dates that matter for the 2025/26 tax year.

Payments on account catch a lot of first-time filers by surprise. If your tax bill is more than £1,000 and less than 80% of your tax is collected at source, HMRC asks you to pay towards next year's bill in advance, in two instalments. Each instalment is half of your previous year's tax bill. So if you owed £7,000 for 2025/26, on 31 January 2027 you would pay that £7,000 plus a £3,500 payment on account, then another £3,500 on 31 July 2027: £14,000 across the year. The first time this happens it feels like a double bill, because it nearly is. AccountsOS flags payments on account ahead of time and shows you the full schedule, so you can set the money aside rather than be blindsided in January.

Does Making Tax Digital apply to sole traders?

Yes, and this is the biggest change coming to self-employment. Making Tax Digital for Income Tax (MTD for ITSA) starts on 6 April 2026 for sole traders and landlords whose qualifying income (turnover from self-employment plus property income, before expenses) is over £50,000. From April 2027 it extends to those with qualifying income over £30,000, and a £20,000 threshold is planned to follow.

Once MTD applies to you, two things change. First, you must keep your records digitally in HMRC-recognised software, which effectively ends spreadsheet-only and paper bookkeeping. Second, instead of one annual return you must send HMRC a quarterly update of your income and expenses, followed by a final declaration after the year end. The quarterly update deadlines are fixed:

For a sole trader doing the books on a spreadsheet, four filings a year plus a final declaration sounds like four times the dread. It is not, if your records are already digital and kept up to date as you go. Because AccountsOS captures and categorises every receipt and transaction the moment it happens, a quarterly update becomes a quick review and a submission, not a fresh round of data entry. AccountsOS is MTD-ready, and Finn will prepare your quarterly figures and prompt you ahead of each deadline. Read the detail in our dedicated MTD for sole traders guide and the wider Making Tax Digital overview.

Do sole traders need to register for VAT?

You must register for VAT if your VAT-taxable turnover goes over £90,000 in any rolling 12-month period, or if you expect to cross that threshold in the next 30 days. This is turnover, not profit, and it is a rolling figure, not a tax-year figure, which is why it catches growing sole traders out. You can also register voluntarily below the threshold if it suits your business, for example if your customers are VAT- registered and you want to reclaim VAT on your purchases.

Once registered, you charge VAT (usually 20%) on your sales, reclaim VAT on eligible purchases, and submit VAT returns to HMRC under Making Tax Digital for VAT, which has been mandatory for all VAT-registered businesses since 2022. AccountsOS calculates your VAT in the background and submits MTD VAT returns directly to HMRC, so crossing the threshold does not have to mean hiring an accountant. There is a full walkthrough in our VAT guide.

Sole trader or limited company: which should you be?

This is the question every growing sole trader eventually asks. There is no universal answer, but the trade-offs are well understood. Sole trader status is simpler and cheaper to run; a limited company can be more tax-efficient at higher profits but adds admin, filing, and cost. Here is the comparison side by side.

As a rough rule, once your profit is comfortably above £50,000 it is worth modelling whether incorporating saves you enough tax to justify the extra admin. Below that, the simplicity of being a sole trader usually wins. You do not have to guess: ask Finn to compare the two outcomes for your actual numbers, and if you do decide to incorporate, AccountsOS handles limited company accounting too, so you do not have to switch platforms when you grow.

How AccountsOS works for sole traders

The whole point is that the books happen in the background, in seconds, in the moments you already have, rather than in one dreaded session. Here is the flow.

How much does sole trader accounting software cost?

AccountsOS is £20 a month, with a 14-day free trial and no card required to start. Everything is included: receipt capture, automatic expense and mileage tracking, bank feeds, Self Assessment-ready figures, MTD quarterly updates, VAT, and unlimited questions to Finn by chat or voice. There are no per-feature add-ons and no per-document charges.

For context, a traditional accountant for a sole trader typically charges between £30 and £150 a month, often with a slow reply time and an annual scramble to send them your paperwork. A single hour of an accountant's time can cost more than a month of AccountsOS. You are not buying forms, you are buying the work done.