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Corporation Tax Software

CT600 software for UK limited companies.

Submit directly to HMRC and Companies House. Our CT600 filing software calculates tax liability, handles marginal relief, and seamlessly manages your accounts.

Start FilingHow it works
Related: Filing Online Guide • Dormant Accounts • Tax Calculator
POWERFUL FEATURES

Everything you need for corporation tax

Our CT600 filing software handles standard trading periods, dormant companies, and charities seamlessly. Please note that CT600B–D and CT600F–P are not supported.

Everything in one submission

Submit your CT600 version 3 to HMRC and iXBRL statutory accounts to Companies House simultaneously from a single set of figures.

Automatic tax computation

Our system calculates the 19% small profits rate, 25% main rate, and pro-rates marginal relief automatically across split financial years.

Capital allowances

Easily enter per-pool breakdowns mapped to the correct analysis boxes (690 AIA, 693 special rate allowance, 705 main pool, etc.).

Supplementary pages

Full support for supplementary pages CT600A (loans to participators) and CT600E (charities and CASCs).

Data import

Import trial balance or bookkeeping figures smoothly via CSV, avoiding manual double-entry and reducing errors.

Amendments & repayments

Easily file an amended return or claim a repayment for an earlier period directly through our wizard.

Coverage

See exactly what's covered

Our intelligent wizard supports the core requirements of most UK limited companies, automatically calculating complex relief structures, including full support for supplementary pages CT600A and CT600E.

149Boxes Supported
16Categories
AutoTax Calculations

Company & Return Info (Boxes 1–115)

1
Company name
2
Company registration number
3
Tax reference (UTR)
4
Type of company
30
Period start date
35
Period end date
40
A repayment is due for this return period
45
Claim affecting earlier period
50
Multiple returns
80
Accounts attached
85
I attach accounts and computations for a different period
90
Reason why accounts and computations are not attached
95
Supplementary pages – CT600A
115
Supplementary pages – CT600E
Covering the exact needs of most UK limited companies and agencies, including complete supplementary forms like CT600A and CT600E.
WORKFLOW

Simple to use

1

Select Period

2

Enter Financials

3

Provide Credentials

4

Submit Safely

PRICING

Transparent, live pricing

Dormant Company

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  • Companies House Filing
  • CT600 Nil Return
  • Generated iXBRL Accounts
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Most Popular

Trading Company

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  • Full CT600 Return
  • Companies House Accounts
  • CT600A and CT600E Support
  • Auto Tax Calculation
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Accountant Membership

.../year
  • Up to 100 Filings
  • Priority Support
  • Client Management
  • All Filing Types Included
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FAQ

Frequently asked questions

Yes. HMRC requires all Corporation Tax returns to be filed online using commercial software that produces computations and accounts in inline eXtensible Business Reporting Language (iXBRL) format. You cannot file a paper CT600.
Absolutely. As a company director, you are legally allowed to file your own CT600 and statutory accounts. Our software guides you through the process so you can file directly without hiring a professional accountant.
WeFile strictly supports and files the CT600 (2026) Version 3 form. This is the latest specification required by HMRC's Corporation Tax online service.
Yes. We automatically convert your entered profit & loss and balance sheet figures into compliant iXBRL statutory accounts required by both HMRC and Companies House.
Yes, you can file an amended return easily through our platform. An amendment can revise the Corporation Tax return only, or the statutory accounts as well.
HMRC does not accept a single CT600 for a period longer than 12 months. If your accounting period is e.g. 18 months, our wizard helps you file it as two separate, consecutive Corporation Tax returns.
Yes, WeFile submits your statutory accounts directly to the Companies House software filing service at the same time as sending your CT600 to HMRC.
Yes. Your data is encrypted and securely transmitted directly to HMRC and Companies House. We utilise official integration APIs and never expose your sensitive credentials.