TinyTax Alternative: Compare CT600 Filing Software for 2026
HMRC's free CT600 filing service closed on 31 March 2026, leaving thousands of company directors to find affordable alternatives. Here's how the options compare.
Why Look for Alternatives?
Since March 2026, you need commercial software to file your CT600. The key requirements are:
- HMRC-recognised software that can submit electronically
- iXBRL accounts generation (required by HMRC)
- CT600 tax computation in iXBRL format
- Accurate tax calculation including marginal relief
Feature Comparison
| Feature | Taxpipe | TinyTax | HMRC Free (Closed) |
|---|---|---|---|
| Price | £59 one-off | Subscription | Free (closed Mar 2026) |
| CT600 filing | ✅ | ✅ | ✅ |
| iXBRL accounts | ✅ Auto-generated (micro-entity / dormant); upload for small companies | ✅ | ❌ Basic |
| Tax computation | ✅ Auto-calculated | ✅ | ✅ Auto-calculated |
| Marginal relief | ✅ Automatic | ✅ | ✅ Automatic |
| Dormant companies | ✅ Quick-file | ✅ | ✅ |
| Subscription | ❌ One-off | Monthly/annual | N/A |
| Support | Help centre + email | None |
Why Directors Choose Taxpipe
1. One-Off Pricing
Most CT600 software charges a monthly or annual subscription — even though you only file once a year. Taxpipe charges £59 per filing. File once, pay once.
2. Everything Automated
Enter your company's income and expenses. Taxpipe calculates:
- Corporation Tax (19% or 25%)
- Marginal relief
- Capital allowances
3. iXBRL Built In
HMRC requires your accounts and tax computation in iXBRL format. For micro-entity (FRS 105) and dormant companies, Taxpipe generates iXBRL accounts automatically — you don't need to understand iXBRL or buy separate tagging software. If you prepare small company (FRS 102 Section 1A) accounts, you attach iXBRL produced in your accounting software; Taxpipe handles the CT600 and tax computation iXBRL for you. Either way, the tax computation iXBRL is always auto-generated.
4. HMRC Validated
Every Taxpipe submission is validated against HMRC's schemas before it's sent. If there's an issue, we catch it before HMRC does.
Who Should Use What?
| Situation | Recommendation |
|---|---|
| Single company, simple return | Taxpipe (£59, done in 15 min) |
| Multiple companies, complex returns | Consider full accounting software |
| Dormant company | Taxpipe (£59, done in 5 min) |
| Need accounts prep too | Accounting software + Taxpipe for filing |
Try Taxpipe free — enter your figures, see your tax calculation, pay £59 only when you're ready to file.