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Tax Computation Requirements for CT600 and iXBRL Filing, explained simply

A tax computation explains the adjustments from accounting profit to taxable profit and supports the CT600 filing. We can often start reviewing accounts before the computation is final, but final HMRC filing usually needs the computation, tax liability figures and any relevant schedules.

Plain English

What is a tax computation and why do we need it?

It explains

  • Profit/loss adjusted for tax
  • Allowances and reliefs
  • Tax liability or repayment

It supports

  • CT600 figures
  • Accounts alignment
  • HMRC filing evidence
Required content

What your computation must include

Adjusted profit or loss
Capital allowances
R&D claims if applicable
Group relief if applicable
Tax liability or repayment figures
Formats

Formats we accept

Excel
Word
PDF
TaxCalc export
Alphatax export
IRIS export
CCH export
Not ready yet?

What if you do not have a computation yet?

We can start

  • Accounts readiness review
  • Document checks
  • Initial tagging preparation

We need before filing

  • Final computation
  • Tax liability figures
  • Confirmed CT600 data
Common questions

Tax Computation Requirements for CT600 and iXBRL Filing FAQs

Not always. We can start reviewing accounts, but final CT600 filing support usually needs the completed computation.

The company accountant, tax adviser or internal tax team usually provides it.

Yes. We can coordinate document requirements and missing items with a third-party accountant.

Excel, Word, PDF and exports from common tax software are accepted.

For CT600 workflows, supporting computations are commonly included with the filing package where required.

Yes, but affected facts should be rechecked once final figures are available.

Need help with tax computation requirements for ct600 and ixbrl filing?

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