CT600 done right, tax bill done low
Most companies overpay corporation tax because nobody's hunting for the savings. We are. Capital allowances, R&D claims, super-deductions, group relief — the works.
Who it's for: Every UK Ltd company that's traded in the year. Bundled discount when paired with Annual Accounts.
What you get with MyTaxFile
Every relief, claimed
Annual Investment Allowance, structures and buildings allowance, R&D tax credits, terminal loss relief — we apply what you're entitled to.
Fixed fee, no % of savings
Other firms charge 15–25% of your tax saving. We charge a flat fee and you keep 100% of what we save you.
iXBRL tagged correctly
HMRC rejects 1 in 6 CT600 submissions on tagging errors. We get it right first time.
Loss-making? Still useful
We'll register your trading losses to carry forward or sideways — protecting tax on future profits.
Bundle saver
Add Annual Accounts and we knock £200 off the combined price. Most clients bundle.
Everything in the price
No "add-ons", no "extras". The fixed fee covers the whole job.
- CT600 corporation tax return prepared and reviewed
- Capital allowance schedules (AIA, FYA, WDA)
- R&D tax credit claim where eligible (additional fee may apply for complex claims)
- iXBRL accounts tagging for HMRC
- Submission via HMRC agent gateway
- Tax payment instructions and deadline reminders
- 12 months of HMRC enquiry support if your return is queried
Three steps. Day-of turnaround.
We start from your accounts
Either accounts we've prepared, or your existing ones. We need a trial balance and any large transactions.
We hunt for savings
Capital allowance review, R&D screening, structure optimisation. We'll tell you exactly what we found and what it saves.
We file with HMRC
CT600 submitted via our agent account. You get the filed return, computation, and a payment slip.
Ready to get this filed?
From £250 · fixed fee · most filings in 24 hours · UK-qualified accountant.
Real prices. No "starting from" fluff.
| Tier | Price |
|---|---|
| Simple company (single revenue stream, modest expenses) | £250 – £350 |
| Active trading company | £350 – £600 |
| Complex (R&D claim, group relief, capital intensive) | £600 – £900 |
| Bundle: Accounts + CT600 | Save £200 |
Built for real UK working life
MyTaxFile vs the big tax-app crowd
| MyTaxFile | The big tax-app crowd | |
|---|---|---|
| Self Assessment from | £79 | £119+ |
| Same accountant year-round | ✓ | Different each time |
| Average turnaround | 24 hours | 3–7 days |
| UK-only specialists | ✓ | Mixed teams |
| Direct phone access | ✓ | Email-only on lower tiers |
| Fixed-fee, no surprises | ✓ | Tier upsells |
Frequently asked
Is R&D tax credit really worth claiming?
When is corporation tax due?
I made a loss this year — do I still file?
Can you handle group structures?
Free tools and related services
Stop dreading tax. Start ignoring it.
Get a fixed-fee quote in 60 seconds. No signup, no card, no sales call. We'll just tell you what it'll cost and how fast we can file it.