Tool Review · Updated 2026-04
Untied
Untied is the easiest way for a UK sole trader to become MTD ITSA compliant. If you have simple income and want the least friction possible, Untied is the right tool. Premium at £14.99/month covers everything you need.
No commercial relationship — Untied is featured on editorial merit alone.
Verified April 2026 · Source: GOV.UK
Untied and MTD ITSA
Untied is one of the few UK software products built from the ground up specifically for self-assessment and MTD ITSA — rather than being a general accounting tool adapted for UK tax compliance. This shows in the user experience: the MTD ITSA quarterly submission flow is the simplest of any tool we have reviewed.
MTD ITSA Rollout Phases
- Phase 1 — April 2026 Live ✓ Supported
Income over £50,000
- Phase 2 — April 2027 ✓ Supported
Income over £30,000
- Phase 3 — April 2028 ✓ Supported
Income over £20,000
Phase support verified against GOV.UK software finder . Always confirm with the software provider before your obligation date.
GOV.UK verification: Untied’s MTD ITSA recognition is listed on the GOV.UK software finder. Status correct as of April 2026.
Verified April 2026 · Source: GOV.UK
No commercial relationship (at launch): Untied’s affiliate programme status is unconfirmed at MTDStack’s launch date. This review is independent. We will update this page if an affiliate relationship is established.
Who Untied is designed for
Untied is designed for the simplest MTD ITSA use case: a UK sole trader with income from one or two sources, who wants to move from spreadsheets to compliant software with minimum friction. The app walks you through categorising income and expenses, and the quarterly submission is handled in a few taps.
Screenshot: Untied MTD ITSA submission
Untied’s quarterly update interface for MTD ITSA — reviewed April 2026.
Free vs Premium
The free tier covers basic self-assessment filing but not MTD ITSA quarterly updates — you need Premium (£14.99/month) for full MTD compliance. At that price it is competitive with QuickBooks Simple Start (£14/month) and Zoho Books Standard (£12/month), though less feature-rich as a general accounting tool.
If you specifically want the simplest possible MTD ITSA experience and do not need purchase orders, inventory, or payroll, Untied Premium is worth trying.
MTD ITSA Phase Support
MTD ITSA Rollout Phases
- Phase 1 — April 2026 Live ✓ Supported
Income over £50,000
- Phase 2 — April 2027 ✓ Supported
Income over £30,000
- Phase 3 — April 2028 ✓ Supported
Income over £20,000
Phase support verified against GOV.UK software finder . Always confirm with the software provider before your obligation date.
Untied is purpose-built for UK self-assessment and MTD ITSA — one of few tools designed from the ground up for this use case rather than adapted from general accounting software. Affiliate status unconfirmed — check before launch.
Landlord support: Basic property income tracking available. Suitable for straightforward buy-to-let alongside self-employment income.
CIS support: No dedicated CIS functionality. Not recommended for CIS subcontractors.
Pricing (GBP)
| Plan | Price/mo | Contacts | |
|---|---|---|---|
| Free | £0 | Free to file Self Assessment (premium for MTD ITSA) | Get free → |
| Free | Free | Get started → | |
| Premium | £14.99/mo | Get started → |
Prices shown are monthly and exclude VAT. Annual billing available. Affiliate status unconfirmed at MTDStack launch — verify before publishing affiliate links.
Last verified: April 2026
What we like
- + HMRC-recognised for all three MTD ITSA phases
- + Simplest MTD ITSA submission experience available
- + Purpose-built for UK self-assessment (not adapted from US software)
- + Strong mobile app
- + Free tier for basic Self Assessment filing
What we don't like
- − Affiliate status unconfirmed at launch
- − Less feature-rich than full accounting platforms (no purchase orders, inventory, etc.)
- − Smaller user base and accountant community than Xero/QuickBooks
- − Not suitable for complex businesses
Who it's best for
- ✓ Sole traders with simple income migrating from spreadsheets
- ✓ Users who want the absolute simplest MTD ITSA experience
- ✓ Mobile-first users who want to manage tax from their phone
Not ideal if
- ✗ Businesses needing full accounting (purchase orders, inventory, payroll)
- ✗ CIS subcontractors
- ✗ Users who need their accountant on the platform