Corporation Tax remains one of the most important obligations for UK limited companies. Missing deadlines can result in penalties and interest, so it’s vital that business owners understand the payment timelines for 2025 and how they may differ depending on company size and profits.
1. Standard Corporation Tax Payment Deadline
For most companies:
- Corporation Tax is due 9 months and 1 day after the end of your company’s accounting period.
Example: If your company year-end is 31 March 2025, Corporation Tax must be paid by 1 January 2026.
You must also file your Company Tax Return (CT600) within 12 months of your accounting period end.
2. Large Companies – Quarterly Instalments
If your company’s annual profits exceed £1.5 million, Corporation Tax must usually be paid in quarterly instalments.
- Payments are due in months 7, 10, 13, and 16 after the start of the accounting period.
- For very large companies (profits above £20 million), payments may be due even earlier.
This ensures tax is paid closer to when profits are earned, rather than waiting until the year-end.
3. 2025 Updates & Key Changes
- The main rate of Corporation Tax remains at 25% (with marginal relief for profits between £50,000 and £250,000).
- Companies with profits below £50,000 continue to pay the small profits rate of 19%.
- HMRC is increasing its use of digital services and payment tracking to monitor late payments more closely.
4. Penalties for Late Payment
- Interest is charged on late payments from the due date until the tax is paid.
- Persistent late payment may trigger HMRC compliance checks.
- Late filing of the CT600 return carries automatic penalties, starting at £100.
5. How to Pay Corporation Tax
HMRC accepts payments by:
- Online banking (Faster Payments, CHAPS, BACS)
- Direct Debit
- Corporate credit or debit card
- At your bank or building society (with a payslip)
Always allow enough time for the payment to clear by the deadline.
How Eclat Accountancy Can Help
We help limited companies:
- Track and meet Corporation Tax deadlines
- Plan cash flow around instalment schedules
- Maximise reliefs and allowances to reduce tax bills
- Avoid HMRC penalties through proactive tax planning
Final Thoughts
Staying on top of your Corporation Tax deadlines is essential for smooth business operations in 2025. With HMRC tightening compliance and digital monitoring, accurate tax planning and timely payment are more important than ever.
Contact Eclat Accountancy today for expert guidance on managing your Corporation Tax obligations and deadlines.
