ABC SA100
ABC SA100: A low-cost desktop option for complex UK Self Assessment returns. Ranked #91 of 123 in Personal Tax Software by our editors (3.0/10); pricing: Paid; best for low-cost UK desktop filing for complex returns.
At a glance
- Editor score3.0 / 10
- PricingPaid
- Best forLow-cost UK desktop filing for complex returns
- Free planNo
- Paid from£16/user one-time
- Self-employment supportYes
- Founded2013 · Bath, England, United Kingdom
- Facts checked22 Sep 2026
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
Our verdict on ABC SA100
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.
Your product? Our editors can test ABC SA100 in depth and publish a review, labelled as paid · from $149/mo →
ABC SA100 pricing
All 3 ABC SA100 plans and prices →
ABC SA100 fact sheet
| Free plan | No |
|---|---|
| Paid from | £16/user one-time |
| Self-employment support | Yes |
| Investment income | Yes |
| Rental income | Yes |
| State filing | None |
| Mobile access | Web_only |
| Audit support | Not verified |
| Deployment | Desktop |
| Platforms | Windows, macOS, Linux |
| Support | Tickets, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 1 integrations: HMRC |
| Pricing | Paid (source) |
| Website | abcsa.co.uk |
| Facts checked | 22 Sep 2026 |
ABC SA100 integrations
ABC SA100 lists 1 integrations on its own site.
- HMRC
Alternatives to ABC SA100
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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