Corporation Tax, filed and optimised.

If you trade through a limited company, Corporation Tax has its own rules, deadlines and filing requirements – and getting it wrong triggers automatic penalties and interest. We take the complexity out of it.

Corporation Tax & Statutory Filing: Critical Dates

Failing to meet tax or filing deadlines results in automatic financial penalties and HMRC interest charges.

9 Months

Companies House Filing

Private limited companies must file their annual statutory accounts with Companies House within 9 months of their financial year end.

9 Months + 1Day

Corporation Tax Payment Due

For companies with profits under £1.5 million, full payment for Corporation Tax must be settled with HMRC 9 months and 1 day after the accounting period ends.

12 Months

CT600 Tax Return Filing

Your Company Tax Return (CT600) must be submitted to HMRC within 12 months of your accounting period end.

Late Filing Penalties

Companies House and HMRC issue separate penalties for late filings. HMRC charges an instant £100 penalty for late CT600 returns (increasing to £200 after 3 months), alongside daily interest on unpaid tax.

Claiming reliefs & deductions

Corporation Tax is charged on taxable profits, not accounting profits – we make sure every legitimate relief is claimed.

Capital allowances

Including Full Expensing and the Annual Investment Allowance.

R&D relief & the Patent Box

For qualifying innovation and IP income.

Loss relief & charitable donations

Carried forward or offset where the rules allow.

Payment planning & year-round advice

Corporation Tax is typically the largest single bill a company pays – we plan ahead with quarterly estimates, ring-fenced savings, director loan account planning and HMRC Time to Pay arrangements if cash flow is tight.

Common mistakes

  • Confusing accounting profit with taxable profit
  • Missing the 9-month payment deadline
  • Failing to file CT600 within 12 months
  • Not claiming capital allowances

What that costs vs. what we do

  • We separate the two, so you neither over nor underpay
  • Automatic interest charges avoided with a tracked payment plan
  • Filed on time – no escalating penalties or public record
  • Capital allowances claimed in full, every year

Explore related services

A situation rarely fits one box neatly — here is what else often applies.

Company Set-up for Start-ups

Incorporation, structure and registrations – right from day one.

VAT

Registration, scheme selection and MTD-compliant quarterly returns.

Payroll & Auto-Enrolment

RTI, pensions and statutory payments, processed accurately every payday.

Running a limited company?

Let us ensure your Corporation Tax is accurate, compliant, and optimised.

Book a free consultation →