Corporation Tax filing

File your CT600 online for £39 + VAT

For directors of small or dormant companies who do not want an accountant and do not want a subscription. Enter your figures, review the computation, pay, file to HMRC, keep the receipt.

File my CT600See pricing

iXBRL accounts and computation included · Filed direct to HMRC · £39 + VAT per return · Pay only when you file

1. Enter your figures

Turnover, costs, and a balance sheet — taken straight off your accounts. Each box says where the figure comes from, and the balance sheet is checked before you can go on.

2. Review the computation

See the adjustments, the reliefs and the tax due, box by box, with the exact XML that would be sent. Nothing reaches HMRC while you are still checking.

3. Pay and file

One payment of £39 + VAT, then submit. HMRC returns a receipt with a correlation ID and IRmark, stored in your filing history.

iXBRL accounts and computation included

HMRC will not accept a CT600 on its own. It needs statutory accounts and a tax computation, both tagged in iXBRL — the part that usually forces you to buy a second product or hire an accountant.

  • Micro-entity accounts (FRS 105) generated from the figures you entered
  • Tax computation tagged against the right HMRC taxonomy for your period end
  • Both attached to the return automatically — nothing to produce yourself
  • The same accounts can be filed to Companies House from the same screen

The awkward bits are handled

Most of what makes a CT600 harder than it looks is the gap between your accounts and your taxable profit. That gap is what the computation is for.

  • Depreciation added back and replaced by capital allowances, including the annual investment allowance
  • Entertaining, fines and penalties disallowed; charitable donations relieved once, in the right place
  • Marginal relief and the small profits rate applied, with associated companies taken into account
  • Trading losses brought forward and carried forward, and s455 tax on an overdrawn director’s loan
  • A first period longer than twelve months split into two returns, for one payment

An HMRC receipt, and a record of it

A filing you cannot evidence is not much comfort twelve months later. Every submission is recorded with what HMRC sent back.

  • Correlation ID and IRmark from HMRC, stored against the return
  • The exact XML that was transmitted, downloadable afterwards
  • A rejected return can be corrected and resubmitted at no extra charge
  • Filing history kept in your account for every period you file

How AccLedger compares

CapabilityAccLedgerTypical accountant
Cost per CT600£39 + VAT£300–900
iXBRL accounts produced for you
iXBRL tax computation produced for you
Subscription or engagement letter required
Filed the same day you are ready
Resubmission after an HMRC rejectionNo extra chargeUsually included
Advice on your specific tax position
Upgrade path to full bookkeepingFrom £5/monthSeparate engagement

Frequently asked questions

Which companies can use this?
UK-resident limited companies and PLCs with straightforward affairs — a small trading company, a contractor company, a property-holding company or a dormant company. You need your company registration number, your Corporation Tax UTR and a set of figures for the period. Groups, companies with overseas branches and anything needing specialist reliefs are better served by an accountant.
Do I need to keep my bookkeeping in AccLedger?
No. You type the figures straight off your accounts: turnover, cost of sales, operating expenses, the few items the computation treats differently, and a balance sheet. AccLedger checks that the balance sheet casts, works out the tax, and builds the accounts and computation from what you entered.
What is included in the £39?
The CT600 itself, the iXBRL accounts and the iXBRL tax computation — HMRC requires all three, and they are generated for you. You also get the submission preview, the HMRC receipt with its correlation ID and IRmark, and your filing history. There is no subscription and no card stored.
What if HMRC rejects my return?
You correct it and submit again at no extra charge. The payment covers the return for that accounting period, not a single transmission attempt.
What does an amended return cost?
No extra charge. Your payment covers that accounting period, so if HMRC has already accepted a return and you need to replace it, the amended return is included. HMRC accepts amendments for twelve months after the filing deadline; after that a correction has to go to HMRC in writing.
My first accounting period is longer than 12 months. What happens?
A Corporation Tax accounting period cannot exceed twelve months, so a longer first period of account has to be filed as two CT600s. AccLedger splits it for you, apportions the figures and prepares both returns — and one payment covers the pair.
Do I still have to file accounts at Companies House?
Yes. The CT600 and its accounts go to HMRC; Companies House is a separate filing. AccLedger produces the same iXBRL accounts for both, and can file them to Companies House as well.
When is my CT600 due?
Twelve months after the end of your accounting period. The tax itself is due earlier — nine months and one day after the period end — so filing early is usually the right call even though the deadlines differ.

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One return, one payment, filed today

Create an account, enter your figures, review the computation and file your CT600 to HMRC. £39 + VAT, paid only when you submit.

File my CT600See pricing

iXBRL accounts and computation included · Filed direct to HMRC · £39 + VAT per return · Pay only when you file