What to look for when choosing personal tax software HMRC recognition: The software must be on HMRC's list of recognised software for Self Assessment filing. Without this, electronic submission is not possible. Supplementary page coverage: Confirm that the software supports all the pages relevant to your client mix. Foreign income, trusts, and partnership income require specific pages that not all tools include. MTD for ITSA readiness: If you have clients who will be caught by MTD from April 2026, confirm the software supports quarterly updates. Data import: The ability to import payroll data, bank feeds, and prior-year information saves significant time and reduces errors. Filing deadline management: Practices benefit from tools that flag approaching deadlines and track submission status across the client base. Key takeaways Individuals can use HMRC's free online portal for straightforward returns; third-party tools like GoSimpleTax offer a more guided experience. Accounting practices need professional compliance platforms such as TaxCalc or IRIS, which support agent filing and multi-client management. MTD for ITSA requires software capable of quarterly submissions, not just year-end filing, from April 2026 for higher-income clients. Always verify that your chosen software appears on HMRC's recognised software list before committing to it for client filings. The Self Assessment filing deadline is 31 January for online returns; late filing penalties begin at £100 and increase over time. Frequently asked questions Can I file my Self Assessment return for free?

Yes. HMRC provides a free online Self Assessment filing service at tax.service.gov.uk. It covers the SA100 and most supplementary pages and is suitable for most straightforward cases. Third-party tools offer a more guided experience for a small fee, and some offer a free tier for simple returns.

Personal Tax Software for Self Assessment: Top Options Reviewed

Personal tax software for Self Assessment covers a wide range of tools, from simple apps designed for individuals filing a single return, to professional compliance platforms used by accountants managing hundreds of clients. The right choice depends entirely on who is filing and how complex the tax position is.

This guide reviews the leading options in 2026 and explains what to look for whether you are filing your own return or acting as an agent for clients.

Who needs to file a Self Assessment return?

HMRC requires a Self Assessment return from anyone whose tax affairs fall outside the PAYE system or who has income above certain thresholds. Common reasons include:

Self-employment income above £1,000
Property rental income
Income from savings, investments, or dividends above the relevant allowances
Capital gains above the annual exempt amount
Income above £100,000 (which reduces the personal allowance)
Child Benefit receipt where household income exceeds £60,000
Foreign income
Directors of limited companies

If HMRC has issued a notice to file, you are legally required to submit a return by the deadline: 31 October for paper returns, 31 January for online returns. A late filing penalty of £100 applies immediately, with further charges accruing after three months.

Software for individuals filing their own return

If you are filing your own Self Assessment, HMRC's free online service at tax.service.gov.uk is available to all registered taxpayers. It covers the standard SA100 form and most supplementary pages. It is functional for straightforward cases but offers minimal guidance and no calculations until you have entered all data.

GoSimpleTax

GoSimpleTax is a popular self assessment software option for individuals wanting a more guided experience than HMRC's own portal. It walks users through income and allowance fields with plain-English descriptions, provides live estimates to help prevent unexpected tax bills at year-end, and files directly to HMRC. It supports most SA100 supplementary pages including rental income (SA105), employment (SA102), and self-employment (SA103).

Pricing is per return and relatively low, making it accessible for individuals. It is less suited to complex cases involving foreign income, trusts, or multiple sources.

TaxScouts

TaxScouts combines software with an accountant review service. Users enter their information and a qualified accountant checks the return before submission, giving them access to expert advice before filing. This hybrid model suits people who want assurance without paying full accountancy fees. Pricing is fixed per return.

Untied

Untied is a mobile-first tax app aimed at self employed people such as freelancers, contractors, and sole traders. It connects to bank accounts via Open Banking to import transactions, categorises income and expenses, and prepares the self-employment pages of the SA100, which can help save time for people managing ongoing income and expenses. It is built for Making Tax Digital users who need compliant digital records and supports quarterly submission as the rules evolve.

Software for accountants managing client Self Assessment returns

For practices managing Self Assessment on behalf of clients, a professional compliance platform is essential. The individual-facing tools above are not designed for agent filing or multi-client management.

TaxCalc Personal Tax

TaxCalc's Personal Tax module is assessment software designed for full SA100 compliance work in accounting practices. It supports the complete SA100 form set including all supplementary pages, files via the Government Gateway using agent credentials, and handles prior-year data and comparative returns. It integrates with TaxCalc's corporation tax and accounts production modules for firms handling both personal and company work. TaxCalc also offers optional add ons for extra functionality, including a dividend database. The platform aims to make assessment simple, and straightforward returns can be completed in under 30 minutes.

IRIS Personal Tax

IRIS Personal Tax is the equivalent product in the IRIS ecosystem. It is well established in larger practices and integrates tightly with IRIS Practice Management and IRIS Payroll. The product covers all SA100 supplementary pages and supports MTD for ITSA. For firms already using IRIS for other functions, it offers a natural fit.

Digita Personal Tax (Thomson Reuters)

Digita is used in many of the larger UK accountancy firms. It offers deep functionality across the SA100 form set and integrates with Digita's accounts production and corporation tax products. It sits at the higher end of the pricing spectrum and suits practices with significant volumes of complex personal tax work.

Xero Tax (personal tax module)

Xero Tax is part of Xero’s wider software products and supports SA100 personal tax returns by drawing data directly from connected Xero client records. For practices with a predominantly Xero-based client base, including many small businesses, this reduces manual data entry, and broader accounting plans may also cover VAT returns. Where direct personal tax filing is limited, returns may still need to be submitted separately through HMRC Gateway or the HMRC portal. The functionality is narrower than dedicated compliance platforms, but for straightforward employment and self-employment cases, it is a practical option.

MTD for ITSA and what it means for personal tax software

Making Tax Digital for Income Tax Self Assessment changes the filing model for sole traders and landlords from April 2026. Those with annual income above £50,000 must submit quarterly updates to HMRC during the tax year, with a final declaration replacing the traditional SA100 at the end of the tax year. The threshold drops to £30,000 from April 2027.

Software you choose now should be MTD for ITSA ready. This means it needs to keep digital records and support quarterly submission of income and expense totals, not just the year-end return. HMRC's recognised software list confirms which products have achieved this compatibility, and you need HMRC-recognised software for MTD compliance. Some tools, including TaxNav, support multiple income types in one workflow, such as self-employment and UK property. MTD-ready bookkeeping tools such as Sage UK can help manage business finances, but they do not always let you submit the final return directly, so check filing capability assessment directly.

For a full comparison of your options, visit our tax software section.

What to look for when choosing personal tax software

HMRC recognition: The software must be on HMRC's list of HMRC-recognised software for Self Assessment filing. Without this, electronic submission is not possible.
Supplementary page coverage: Confirm that the software supports all the pages relevant to your client mix. Foreign income, trusts, and partnership income require specific pages that not all tools include.
MTD for ITSA readiness: If you have clients who will be caught by MTD from April 2026, confirm the software supports quarterly updates.
Comparing fit: Review software features against your needs and budget before choosing, especially when weighing broader paid tools against simpler low-cost options.
Data import: The ability to import payroll data, bank feeds, and prior-year information saves significant time and reduces errors. More advanced tools may also include tax calculation and wider bookkeeping benefits, which can be worthwhile for a business that is growing rapidly and needs more than basic filing.
Pricing: Transparent pricing is essential so you understand total cost before buying and can spot any hidden fees. Some providers charge per annual return rather than monthly, while newer options such as AbraTax may offer free Self Assessment returns during beta.
Filing deadline management: Practices benefit from tools that flag approaching deadlines and track submission status across the client base.

Key takeaways

Individuals can use HMRC's free online portal for straightforward returns; third-party tools like GoSimpleTax offer a more guided experience.
Accounting practices need professional compliance platforms such as TaxCalc or IRIS, which support agent filing and multi-client management.
MTD for ITSA requires software capable of quarterly submissions, not just year-end filing, from April 2026 for higher-income clients.
Always verify that your chosen software appears on HMRC's recognised software list before committing to it for client filings.
The Self Assessment filing deadline is 31 January for online returns; late filing penalties begin at £100 and increase over time.

Frequently asked questions

Can I file my Self Assessment return for free?

Yes. HMRC provides a free online Self Assessment filing service at tax.service.gov.uk. Many straightforward Self Assessment tax return cases do not require paid software, as the service covers the SA100 and most supplementary pages. Third-party tools offer a more guided experience for a small fee, and some may also offer free filing temporarily, such as during beta access.

What is the difference between personal tax software and practice compliance software?

Personal tax software aimed at individuals is designed for one-off or simple returns and does not support agent filing or managing multiple clients. It’s also worth noting that personal tax software and Making Tax Digital software are not always the same thing. Practice compliance software, used by accountants, allows filing on behalf of clients using HMRC agent credentials, handles multiple returns simultaneously, and typically covers the full range of SA supplementary pages and other return types such as CT600, while some accounting software is better for managing business records than for direct filing.

What happens if I miss the Self Assessment deadline?

A £100 late filing penalty applies immediately if a return is not submitted by 31 January. After three months, a further daily penalty of £10 per day (up to 90 days) begins. After six months, an additional penalty of 5% of the tax due or £300, whichever is greater, is charged. Interest on unpaid tax also accrues from 31 January regardless of the filing date. Even if MTD-style quarterly updates are submitted earlier, the final bill is still settled at the end of the tax year.