Best Tax Software for Self-Employed UK 2026

Introduction

Self-employed tax in the UK is not simple. You need to track your income and expenses throughout the year, calculate Income Tax and National Insurance, potentially handle VAT, file a Self Assessment return, and soon submit quarterly updates under Making Tax Digital. Getting this right matters because mistakes cost money in penalties and overpaid tax.

This guide compares the best software for managing self-employed tax obligations in the UK in 2026.

What Self-Employed Tax Involves

As a self-employed person in the UK, you are responsible for Income Tax on your profits, Class 2 National Insurance (flat rate), Class 4 National Insurance (percentage of profits), VAT if your taxable turnover exceeds the threshold (currently £90,000), annual Self Assessment filing by 31 January, payments on account (advance tax payments based on previous year), and from 2026, quarterly MTD updates for those above the threshold.

Good tax software helps you stay on top of all of these obligations without needing to become a tax expert.

Accounted

Accounted provides comprehensive tax management alongside its AI bookkeeping. Penny monitors your tax position continuously and proactively.

Tax features include real-time Income Tax and National Insurance estimates based on current HMRC rates, VAT threshold monitoring (Penny alerts you when you approach £90,000 turnover), automatic categorisation of expenses into HMRC-compliant categories, identification of available tax reliefs and allowances, cash flow forecasting that accounts for upcoming tax payments, deadline reminders for Self Assessment, payments on account, and MTD submissions, direct HMRC filing for VAT and Self Assessment, and CIS deduction tracking for construction workers.

What distinguishes Accounted is the proactive nature of its tax monitoring. Penny does not wait for you to check your tax position. She tells you when something needs attention. If your income is approaching a threshold, if a deadline is coming, or if she has identified a tax relief you might be missing, she messages you via WhatsApp.

Pricing starts at £14 per month. See the pricing page.

GoSimpleTax

GoSimpleTax is a dedicated Self Assessment filing tool. It walks you through the tax return process with clear, plain-English guidance, calculates your tax liability, and submits directly to HMRC.

Tax features include guided Self Assessment preparation, tax calculation showing Income Tax, NICs, and payments on account, support for complex situations (property income, capital gains, foreign income), and HMRC submission.

GoSimpleTax is excellent at what it does, but it is primarily a filing tool rather than a year-round bookkeeping platform. You need to maintain your records separately and enter the figures at filing time.

Pricing is typically an annual fee of around £40-£60, which is good value for a filing tool.

TaxCalc

TaxCalc provides detailed tax calculation and Self Assessment filing. It is popular with accountants and individuals who want precise control over their tax calculations.

Tax features include comprehensive tax computation, support for all Self Assessment pages, partnership and trust returns, and HMRC submission.

TaxCalc is powerful but more technical than platforms designed for non-accountants. If you are comfortable with tax terminology and want detailed control, it is excellent.

FreeAgent

FreeAgent combines bookkeeping with tax management. Throughout the year, FreeAgent tracks your income and expenses, and at filing time, your Self Assessment is largely prepared from the data you have already entered.

Tax features include real-time tax estimates, Self Assessment preparation from your bookkeeping data, VAT returns, tax timeline showing upcoming deadlines and estimated liabilities, and MTD compliance.

FreeAgent's strength is the integration between day-to-day bookkeeping and tax filing. If you keep your FreeAgent records up to date, your Self Assessment is straightforward.

QuickBooks

QuickBooks Self-Employed provides basic tax estimates and helps you separate business and personal expenses. The standard plans offer VAT return filing and more detailed tax features.

Tax features include estimated tax liability, expense categorisation for tax purposes, VAT returns on applicable plans, and MTD compliance.

QuickBooks is adequate for basic tax management but does not offer the depth of UK-specific tax intelligence that platforms like Accounted or FreeAgent provide.

Xero

Xero handles VAT returns and provides financial data that feeds into your Self Assessment, though you would typically use an accountant or a separate filing tool for the actual Self Assessment submission.

Tax features include VAT return preparation and filing, comprehensive financial reporting for tax purposes, and integration with accountant workflows.

Xero is not primarily a tax tool for self-employed individuals. Its strength is as a bookkeeping platform that provides the data your accountant needs to handle your tax affairs.

HMRC's Own Tools

HMRC's online services allow you to file Self Assessment directly, check your tax position, and manage payments. The HMRC app provides basic functionality on mobile.

Tax features include Self Assessment filing, tax calculation, payment management, and MTD filing (for simple cases).

The tools are functional but not user-friendly. There is no bookkeeping integration, no proactive monitoring, and the interfaces are government-grade rather than consumer-grade.

The Year-Round vs Filing-Time Distinction

The most important distinction in tax software is between platforms that manage your tax throughout the year and tools that help you file at the end. Year-round platforms like Accounted, FreeAgent, and QuickBooks integrate tax with bookkeeping. Your tax position updates as your records update. By filing time, most of the work is done.

Filing-time tools like GoSimpleTax and TaxCalc are used primarily at Self Assessment time. They are excellent at that specific task but do not help you manage your tax position throughout the year.

With MTD for Income Tax introducing quarterly reporting, the balance is shifting toward year-round management. If you need to submit quarterly updates, you need current records all year, not just at filing time.

Proactive vs Reactive Tax Management

Traditional tax software is reactive. It calculates your liability based on the data you have entered. If you have not entered a tax relief, it does not know about it.

Accounted's approach is proactive. Penny monitors your tax position and actively looks for opportunities and risks. She might identify that you have not claimed capital allowances on equipment you purchased, that your income is approaching the higher rate threshold and suggest pension contributions, or that you are close to the VAT threshold and should plan accordingly.

This proactive approach can save significantly more than the software costs, because it catches things that reactive tools miss entirely.

Our Recommendation

For self-employed workers who want comprehensive year-round tax management with AI monitoring, Accounted provides the most proactive and hands-off experience.

For those who handle their own bookkeeping and need an excellent filing tool, GoSimpleTax offers great value at its annual price.

For those who want integrated bookkeeping and tax in a mature platform, FreeAgent (especially free through NatWest) is a strong choice.

For those who work with an accountant, Xero provides the data your accountant needs to manage your tax affairs efficiently.

Sign up for Accounted and let Penny keep your tax position under control all year round.