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Companies House filing

How to file UK company accounts (Companies House)

This guide explains what to prepare, when to file, and a practical checklist so you can go from “ready” to “submitted” without missing steps.

Key deadlines (most common)

Rules can vary by company and scenario—always verify with official Companies House/HMRC guidance.

  • Accounts to Companies House: usually within 9 months after the period end.
  • First accounts: often longer (commonly the “up to 21 months” rule, depending on incorporation date and ARD).
  • Corporation Tax (HMRC): separate obligations (CT600 + iXBRL package for HMRC).
GOV.UK Annual accounts

Before you file: a practical checklist

This also powers our in-app “File” checklist.

  • Upload statements / import transactions
  • Review & confirm: pending = 0
  • Confirm opening balances (balanced)
  • Add year-end adjustments if needed (accruals/prepayments/depreciation)
  • Check company details (director, registered address, period dates)
  • Unlock download (non-trial credit) to generate iXBRL/PDF