123 SA100 Solution
What 123 SA100 Solution is
123 SA100 Solution is a web and Android service for preparing and submitting personal, partnership and VAT returns to HMRC. Its Standard Package costs £18 a month, charged when submitting, and covers a personal or partnership return, online HMRC submission, a downloadable tax report, and schedules for employed, self-employed, rental, foreign-income, non-resident and trust cases. The Assisted Package costs £75 a month at submission and adds tax-advisor help, tax-team review and technical support for validation issues. For Making Tax Digital returns, users complete a spreadsheet, upload it to bridging software, then review and submit; Excel 2010 or newer is supported, not Excel 2007. The maker says the service is HMRC recognised for SA100, SA800 and MTD VAT. Returns and reports can be downloaded, viewed, saved and printed. Free online chat runs weekdays 9am–5pm UK time, extending to 10pm in January. No downloads are required for its forms.
Who it suits
The service is aimed at self-employed people, landlords and others filing personal or partnership returns. It also supports businesses handling VAT or Making Tax Digital submissions.
What it does well
- Web and Android access
- Supports self-employed and rental income
- Online HMRC submission
- Downloadable, printable tax reports
- Assisted plan includes tax-team review
What to know first
- No stated free plan despite free chat support
- Excel 2007 is unsupported
- Requires HMRC online service activation
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Multi Returns Package | Pay annually · 1 partnership plus 2 personal returns, or any 3 self-assessment returns | On request |
| MTD-ITSA Package (Single Business – Self-Employed or Landlord) | Annual fixed charge · 4 quarterly returns and a final declaration · 1 business | On request |
| MTD ITSA/VAT 50 | Annual fixed charge · 21 to 50 MTD ITSA/VAT returns; credits can be used for VAT and/or MTD Income Tax submissions | On request |
| Assisted Package | Charged at submission · 1 personal or partnership return · return review by tax team · tax adviser assistance | On request |
| MTD ITSA/VAT 20 | Annual fixed charge · Up to 20 MTD ITSA/VAT returns; credits can be used for VAT and/or MTD Income Tax submissions | On request |
| MTD ITSA/VAT 200 | Annual fixed charge · Above 100 MTD ITSA/VAT returns; credits can be used for VAT and/or MTD Income Tax submissions | On request |
| Standard Package | Charged at submission · 1 personal or partnership return · supports non-resident and trust pages | On request |
| MTD-VAT Package (Single Business) | Annual fixed charge · 4 VAT returns · 1 business | On request |
The first 8 of 9 plans, as 123efiling.co.uk lists them, read 11 Oct 2026. The maker's own page has the final word. Every plan
Verdict
123 SA100 Solution covers common Self Assessment, partnership and VAT workflows with web and mobile access.
Facts from 123 SA100 Solution's own pages
- Assisted service
- The Assisted Package includes review by a member of the tax team, help with tax queries and technical support for validation issues. · 123efiling.co.uk, 11 Oct 2026
- Data transfers
- The privacy policy says information may be transferred to countries including the United States, Russia, Japan, China and India. · 123efiling.co.uk, 11 Oct 2026
- Free plan
- No · 123efiling.co.uk, 20 Sept 2026
- Headquarters
- 2nd floor, 6 Oxford Street, Bolton, Greater Manchester, BL1 1RF, United Kingdom · 123efiling.co.uk, 28 Sept 2026
- HMRC recognition
- The maker says its service is HMRC recognised for SA100 personal returns, SA800 partnership returns and MTD VAT. · 123efiling.co.uk, 11 Oct 2026
- Integration
- The service submits returns online to HMRC and requires customers to have activated the relevant service in their HMRC online account. · 123efiling.co.uk, 11 Oct 2026
- Mobile access
- web_and_mobile · 123efiling.co.uk, 20 Sept 2026
- MTD workflow
- For MTD returns, users complete a spreadsheet template, upload it to the bridging software, then review and submit it to HMRC. · 123efiling.co.uk, 11 Oct 2026
- Rental income
- Yes · 123efiling.co.uk, 20 Sept 2026
- Return downloads
- Users can download, view, save and print their return or tax report. · 123efiling.co.uk, 11 Oct 2026
- Security
- The privacy policy says personal information is stored on password- and firewall-protected servers and electronic financial transactions are protected by encryption technology. · 123efiling.co.uk, 11 Oct 2026
- Self-employment support
- Yes · 123efiling.co.uk, 20 Sept 2026
- Spreadsheet compatibility
- The MTD spreadsheet workflow supports Excel 2010 or newer and does not support Excel 2007. · 123efiling.co.uk, 11 Oct 2026
- State filing
- none · 123efiling.co.uk, 20 Sept 2026
- Support
- Free online chat support is available 9am–5pm UK time Monday to Friday, with extended hours until 10pm in January. · 123efiling.co.uk, 11 Oct 2026
- Supported tax cases
- The Standard Package supports schedules including non-resident and trust pages, plus employed, self-employed, partnership, rental and foreign income. · 123efiling.co.uk, 11 Oct 2026
- Web service
- The maker says there are no downloads required to use its forms. · 123efiling.co.uk, 11 Oct 2026
- What it does
- The online service prepares and submits personal and partnership tax returns and VAT returns to HMRC. · 123efiling.co.uk, 11 Oct 2026
- Who it serves
- The MTD ITSA page describes the intended users as self-employed individuals and landlords. · 123efiling.co.uk, 11 Oct 2026
Where 123 SA100 Solution stands on Freedom251
- Tax Software#82 of 149
- Personal Tax Software#77 of 123