Free tool
CT600
Checklist
CT600 inputs checklist builder
Pick your scenario and generate a practical “what you need” checklist for CT600 filing. Not professional advice — always confirm with HMRC guidance.
Scenario
Tick what applies to your company.
Employees / payroll (PAYE)
Assets / equipment purchases (capital allowances)
Vehicle costs / mileage claims
Loans / interest / director loan activity
Losses to carry forward / prior losses
Dividends paid
Common pitfall
Don’t confuse tax payment deadline with CT600 filing deadline.
Generated checklist
Copy-paste friendly.
Basic: Companies House accounts (period end date, P&L + balance sheet for HMRC), and tax computation notes.
Basic: Government Gateway access (or commercial software that files CT600 + iXBRL).
Sanity check: tax payment deadline (often 9 months + 1 day) is before CT600 filing deadline (12 months).
FAQ (with next steps)
What’s the fastest way to understand CT600 vs accounts?
Start with our CT600 guide (deadlines, what HMRC expects, and how it relates to Companies House accounts).
I file micro-entity accounts to Companies House — do I still need full accounts for HMRC?
Usually yes: CT600 packages commonly require fuller accounts and computations. If you’re unsure whether you qualify as a micro-entity, check micro-entity thresholds.