File your corporation tax and company accounts for £10
One price, both filings. Submit your CT600 and iXBRL accounts straight to HMRC and Companies House. Sync directly from Xero or QuickBooks, or upload your own spreadsheet. No subscription. No annual licence.
£10 covers your corporation tax return (CT600) and your statutory accounts together.
Sign up freeNo card required. Only pay £10 when you submit.
✅ HMRC recognised software for CT600
✅ Companies House recognised software
🇬🇧 UK-built and supported
💷 No subscription — pay per submission
Built for directors and accountants alike
Whether you're filing for your own company or for clients, Tax Optimiser works the way you do.
🧑💼 Company directors
File your own corporation tax return and statutory accounts without needing an accountant. Our guided workflow handles the CT600 boxes, the iXBRL tagging, and the submission to HMRC and Companies House. £10 covers both filings for the year. If you're not confident, you can still have an accountant review before you submit.
See how it works →📊 Accountants and bookkeepers
Buy credits in bulk and bring per-filing cost down to £3. File CT600s for as many clients as you like, sync directly from each client's Xero or QuickBooks, and submit to HMRC and Companies House from one place.
See credit pack pricing →From accounts to filed CT600 in three steps
Connect Xero or QuickBooks, or upload a spreadsheet
Link your accounting software in under two minutes using OAuth, or upload your own trial balance spreadsheet. We map the chart of accounts automatically — no manual re-keying.
Review, map and adjust
Map your trial balance to the CT600 computation with our guided workflow. Post adjustment journals that sync back to your accounting system. Built-in validation flags issues before you submit.
Submit CT600 + iXBRL and track deadlines
We generate iXBRL-tagged accounts and your CT600 and submit them directly to HMRC and Companies House from the app. Companies House deadline tracking is built in. You get confirmation receipts in minutes.
Why accountants and directors choose us
💷 £10 covers CT600 and accounts
One price for your corporation tax return and your statutory accounts. No add-ons, no per-module fees, no surprises at renewal time — because there's no renewal.
🔁 True two-way Xero & QuickBooks sync
Most tools only read from your books. We push adjustment journals back, so what you file and what's in your accounting system always match.
🏛 Direct CT600 & iXBRL to HMRC
No iXBRL exports, no third-party portals, no separate filing tools. Submit your corporation tax to HMRC and your accounts to Companies House straight from the app.
📦 Credit packs for accountants
File 25, 100, 500 or more submissions on a single account. Prices drop to as low as £3 per filing. No per-seat fees, no annual licence.
Simple, honest pricing
One filing or a thousand — the more you buy, the less you pay.
Pay-as-you-go
✅ Corporation tax (CT600) return
✅ FRS 105 or FRS 102 1A accounts
✅ Direct Xero & QuickBooks sync
✅ Automatic iXBRL tagging
✅ Direct submission to HMRC and Companies House
✅ Email support
For accountants and bookkeepers
One credit = one company, one year, both filings.
| Pack | Credits | Price | £ per credit |
|---|---|---|---|
| Pay-as-you-go | 1 | £10 | £10 |
| Starter | 25 | £200 | £8 |
| Practice | 100 | £600 | £6 |
| Growth | 250 | £1,250 | £5 |
| Scale | 500 | £2,000 | £4 |
| Enterprise | 1,000 | £3,000 | £3 |
All prices exclude VAT. Credits do not expire.
Sign up to buy creditsFrequently asked questions
File your CT600 for £10. No subscription. No surprises.
Sign up free. Connect your accounting software. Only pay when you submit.
Sign up free