6 Best Self Assessment Tax Software for UK Users [Comparison]

Filing a UK Self Assessment tax return can be one of the most stressful admin tasks you face as a freelancer, sole trader, contractor, or small business owner. To stay on top of your obligations and avoid penalties or late-filing fees, it's important to keep your tax affairs organised well in advance.

Thankfully, there's an ever-growing range of tools designed to take the confusion (and hours of manual data entry) out of tax season.

This guide presents the best Self Assessment tax software available to UK filers in 2026, comparing features, pricing, and suitability to highlight the solutions that fit different types of businesses.

Why use Self Assessment tax software at all?

Filing a Self Assessment tax return in the UK can be time-consuming and confusing, especially if you're juggling multiple income streams, expenses, or deadlines. Tax software is designed to remove much of that complexity by guiding you through the process and doing the heavy lifting behind the scenes.

Self Assessment tax software helps you:

• Automate calculations so you don't have to rely on manual, error-prone spreadsheets or second-guess HMRC formulas. The software applies the latest tax rules automatically and updates figures as you go.
• Organise expenses, income, and allowances in one clear place. This makes it easier to see what counts as an allowable expense, what can be claimed, and how different income types can affect your final tax bill.
• Stay compliant with HMRC rules, including the ongoing shift towards Making Tax Digital. Many tools are built to meet HMRC standards, reducing the risk of submitting incorrect or incomplete information.
• Reduce the risk of costly mistakes that could lead to penalties, interest charges, or HMRC follow-up queries. Built-in checks and prompts help flag missing details before you submit.
• Submit your return digitally directly to HMRC, without switching between portals or filling in long online forms manually. This saves time and gives you confirmation that your return has been received.

Overall, using tax software means you can usually file faster, with fewer errors, and with a much clearer view of what you owe or are owed before you submit. For many UK filers, it turns Self Assessment from a stressful annual task into a more manageable and predictable part of running a business.

The best Self Assessment tax software

Managing Self Assessment can be complex, but the right software can streamline the process. The following six platforms represent some of the leading solutions available to UK filers:

1. ANNA

ANNA (Absolutely No-Nonsense Admin) isn't just a Self Assessment software. It combines a UK business account, automated bookkeeping, and built-in tax support in one app.

Instead of juggling spreadsheets, banking apps, and tax tools, ANNA connects everything together. Your transactions flow straight into your tax calculations, giving you a live, accurate picture of your tax position at all times.

With ANNA, you can:

• Automatically calculate your Self Assessment using real transactions from your ANNA business account
• File directly to HMRC from the app, without dealing with confusing forms or manual data entry
• See live tax estimates throughout the year, so there are no surprises in January
• Prepare for Making Tax Digital (MTD) with software designed for quarterly reporting
• Get real human support from UK-based experts, directly in the app

In practice, ANNA feels less like software and more like an accountant in your pocket. It tracks your money, organises receipts, and keeps your tax accurate and compliant automatically.

Who should choose ANNA?

ANNA is ideal for freelancers, sole traders, contractors, and small business owners who want tax obligations handled automatically, without spreadsheets or accounting jargon.

It's especially well-suited to people who prefer ongoing visibility and reminders rather than dealing with everything once a year.

If you want to stay compliant, prepare for Making Tax Digital, and avoid paying for multiple tools or an accountant for routine admin, ANNA is a strong fit.

Pricing

ANNA offers flexible plans depending on how your business operates.

Self Assessment filing is free for the first year for eligible users on paid plans, making it cheaper overall than buying separate tax software alongside a bank account.

2. TaxCalc

TaxCalc is a long-established UK tax software provider focused specifically on Self Assessment filing. It's HMRC-recognised and designed to help individuals complete and submit their tax return accurately.

TaxCalc operates as a stand-alone tax product. You input your figures manually, and the software guides you through HMRC forms step by step, applying checks along the way to reduce errors.

With TaxCalc, you can:

• Complete and submit your Self Assessment directly to HMRC
• Work through guided questions that map to HMRC forms
• File returns covering employment, self employment, partnerships, and trusts
• Submit returns for previous tax years if you're catching up

In practice, TaxCalc works well as a once-a-year filing tool, but it doesn't manage your finances or tax position outside of the filing process.

Who should choose TaxCalc?

TaxCalc is best suited to individuals who already have their income and expenses organised elsewhere and simply want reliable software to file a Self Assessment return.

If you're comfortable gathering figures manually and only think about tax at filing time, it can be a solid option. It's less suitable if you want automation, live tax visibility, or integrated banking and bookkeeping.

Pricing

TaxCalc plans typically start from £38 for a basic individual Self Assessment return.

There can be additional costs for add-ons, but the pricing is transparent and straightforward.

3. GoSimpleTax

GoSimpleTax is a cloud-based platform designed to make online Self Assessment filing as simple and accessible as possible. Its primary focus is ease of use, rather than ongoing financial management or automation.

The platform guides you through each section of your tax return in a clear, structured way and calculates your tax in real time as you enter figures. Everything is completed online in your browser, with no software to install or complex setup required.

With GoSimpleTax, you can:

• Fill in your Self Assessment through a guided, question-based online interface
• See real-time tax calculations as you enter income and expenses
• Submit your completed return directly to HMRC
• Access guidance and UK-based customer support if you get stuck
• Connect to some accounting tools to import figures, if you already use them

GoSimpleTax makes filing straightforward, but it still relies on you to manually collect, organise, and enter your financial data. It does not track your business finances throughout the year or provide ongoing tax estimates outside the filing process.

Who should choose GoSimpleTax?

GoSimpleTax is a good fit for freelancers, landlords, or sole traders with relatively simple tax affairs who want an easy way to submit their return once a year.

It's less suited to people who want ongoing tax tracking, automated expense categorisation, or tools designed to support Making Tax Digital and quarterly reporting.

Pricing

Pricing for an individual Self Assessment return is £55.99 with an annual subscription, reflecting the standard cost after any introductory discounts. Filing without an annual subscription will typically be more expensive, so opting for the subscription is usually the most cost-effective choice for regular filers.

Higher-priced tiers apply if you have property or foreign income, or if you need additional forms. There is a free trial available, which lets you explore the platform and see your estimated tax before committing.

4. SelfTax

SelfTax is one of the most affordable HMRC-recognised Self Assessment tools available in the UK. It focuses on providing a basic, low-cost way to submit a tax return online. However, it doesn't have any additional features or ongoing support.

The software uses a simple wizard-style interface that guides users through each section of their return and submits it directly to HMRC once complete.

With SelfTax, you can:

• Complete a Self Assessment using a straightforward, step-by-step process
• Submit your return online to HMRC
• File for common income types, such as self-employment or property income

SelfTax has low costs, but it also keeps features to a minimum. There is little guidance beyond the basics, and no tools for tracking income, expenses, or taxes during the year.

Who should choose SelfTax?

SelfTax is best suited to first-time filers or individuals with straightforward tax affairs who are confident in their numbers and want the simplest possible way to file. It isn't designed for automation, tax planning, or ongoing visibility, and may feel limited if your finances become more complex.

Pricing

SelfTax pricing starts from £11.99 per return, making it one of the lowest-cost Self Assessment options available.

Additional charges may apply for more complex income types or supplementary pages. While the upfront cost is low, users should factor in the time required to manually prepare figures before filing.

5. Taxfix (formerly TaxScouts)

Taxfix combines software with access to qualified accountants who prepare and file your Self Assessment on your behalf. Rather than completing the return yourself, you only need to upload your documents and answer a few questions.

This approach removes much of the manual work and reduces the risk of errors, but it also means less direct involvement and higher costs compared to DIY software.

With Taxfix, you can:

• Upload your financial documents securely online
• Have a qualified accountant prepare, review, and submit your return
• Get reassurance that your tax has been checked by a professional
• Pay a fixed, one-off fee with no ongoing subscription

Taxfix focuses on outsourcing tax filing, rather than helping you actively manage your finances or tax position throughout the year.

Who should choose Taxfix?

Taxfix is a good option for busy entrepreneurs, contractors, or high earners with more complex income who prefer to hand everything over to a professional. It's less suitable for people who want live tax estimates, automation, or hands-on control over their tax position during the year.

Pricing

Self Assessment returns typically start from around £169 as a one-off fee.

The price can increase depending on complexity, such as multiple income sources, property portfolios, or overseas income. While there is no subscription, the cost is significantly higher than DIY software and is charged for each tax return filed.

6. Sage UK

Sage is a well-established accounting platform that includes Self Assessment tools as part of a broader accounting and finance system. It's primarily designed for accounting rather than tax-first automation.

Users record income and expenses, manage invoices, and run reports within Sage, then use those records to support their tax filings. This means that Sage can help you become MTD-ready by keeping digital records and preparing summaries that make the Self Assessment process easier.

However, its transaction-to-submission workflow isn't as seamless or automated as it usually is on platforms that combine accounting and tax filing.

With Sage, you can:

• Track income and expenses across your business
• Create invoices and capture receipts
• Use MTD-ready accounting and reporting tools
• Access mobile apps and bank feeds

While Sage is powerful, it assumes a level of accounting knowledge and is often more complex than freelancers or sole traders need for Self Assessment alone.

Who should choose Sage?

Sage is best suited to small businesses that want full accounting software and are comfortable managing tax as part of a traditional accounting workflow. It may feel heavy for individuals who simply want taxes handled automatically without ongoing bookkeeping tasks.

Pricing

Sage offers a free individual plan for very basic use, which may be enough for simple needs. Paid plans typically start from around £7 to £18 + VAT per month, depending on features such as invoicing, reporting, and bank feeds.

Over time, monthly costs can add up, particularly if you only need Self Assessment support.

How to choose the best Self Assessment tax software

Choosing the right Self Assessment software depends on your individual needs and workflow. Here are some general tips to guide your decision:

• Consider your needs: If your tax affairs are simple, a basic tool may be enough. If you have multiple income streams, property, or overseas earnings, look for software that can handle more complex situations.
• Look for automation: Software that calculates tax, tracks expenses, and updates figures automatically can save time and reduce errors.
• Check HMRC recognition: Always choose a platform that is recognised by HMRC and compliant with current regulations.
• Think about integration: If you already use a business bank account or accounting software, consider options that link directly to your financial data for smoother reporting.
• Factor in support and guidance: Some platforms offer live support or accountant assistance, which can be helpful if you're unsure about tax rules.
• Compare costs: Review pricing structures carefully; subscriptions, per-return fees, or add-ons can all affect the total cost.

For freelancers, sole traders, contractors, and small business owners looking for automation, live tax visibility, and integration with their business finances, ANNA stands out as a strong choice.

Why ANNA is the best Self Assessment tax software for UK users

When you compare all the options, a clear pattern emerges. Most Self Assessment tools either help you file your return or help you prepare your numbers. Very few do both, and almost none connect tax directly to your real business finances.

That's where ANNA stands apart.

ANNA is built around how freelancers, sole traders, and small business owners actually work. Your expenses, receipts, and tax calculations all live in one place, updating automatically as you get paid or spend money.

Instead of scrambling for figures in January, you can see your estimated tax throughout the year, with clear reminders and guidance to help you stay on track.

Unlike traditional accounting software, ANNA doesn't assume you want to be an accountant. Everything flows together, from transaction to tax return, with direct submission to HMRC and real human support when you need it.

If you want Self Assessment to feel simpler, more predictable, and far less stressful, ANNA is the most complete and future-ready option available. It's designed not just for today's tax returns, but for Making Tax Digital and beyond.

Get started with ANNA today and let your tax take care of itself.