ABC SA100 review
A low-cost desktop option for complex UK Self Assessment returns.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
ABC SA100 is desktop software for individuals preparing UK Self Assessment SA100 returns, with supplementary forms for employment, self-employment, partnerships, UK property, foreign income, trusts, capital gains and residence. It is aimed mainly at taxpayers completing their own returns, while also supporting agents. The software runs on Windows and macOS, plus Linux via Wine, and stores data locally until submission. It connects directly with HMRC for electronic filing and is designed for UK Self Assessment rather than state filing.
Pricing is straightforward but not free for submission. The ABC SA100 Individual Tax Return 2026 plan costs £16 one time and covers the 2025-26 SA100 return, supplementary forms and amendments. The 2 x ABC SA100 2026 plan costs £30 one time and includes two individual return licences. For partnership needs, ABC SA800 plus 2 x ABC SA100 2026 costs £50 one time, combining one partnership return licence with two individual return licences. Prices are listed before VAT. The free download is an evaluation mode and cannot submit to HMRC, so a licence is required for filing. This structure suits occasional individual or small-scale filing better than users seeking an ongoing free tier.
Its strongest fit is breadth within UK tax returns: users can view tax liability calculations, attach PDF supporting documents up to 5MB total, follow integrated HMRC guidance notes and submit amended returns. Local storage before submission may suit taxpayers who prefer their return data kept on their device. The trade-off is convenience. ABC SA100 is desktop-only, has no mobile filing experience, and relies on ticket support and documentation rather than 24/7 assistance. Choose it if you need a low-cost desktop return covering more than straightforward employment income. Choose an alternative if browser or mobile access, continuous support availability or a free submission plan matters more than broad form coverage.
Questions about ABC SA100
What does ABC SA100 run on? Windows, macOS and Linux. It runs as a desktop app.
What does ABC SA100 integrate with? 1 integration: HMRC.
Who is ABC SA100 built for? Solo users and small businesses (our editorial estimate).
ABC SA100 pros and cons
- Where it wins
- Supports employment, property, foreign income, trusts and capital gains
- Direct electronic submission and amended returns to HMRC
- Runs on Windows, macOS and Linux via Wine
- Where it doesn't
- No free submission plan; evaluation mode cannot submit to HMRC
- Desktop-only deployment limits mobile and browser access
- Support is limited to tickets and documentation
ABC SA100 fact sheet, pricing and score →
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