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    Corporation Tax late filing penalties

    5 min read · 2025-01-15

    • Companies House: £150 then £375 then £750 then £1,500 (private companies); doubled if late two years running
    • HMRC CT600: £100 immediate, £200 at 6 months, then 10% of unpaid tax at 18 and 24 months
    • Penalties stack — they apply on top of late payment penalties
    • Both can be appealed with a reasonable excuse
    Corporation Tax service