The new tax year began on 6 April, and directors started to see the impact of updated corporation tax rates cutting into profits. Before doing business in the UK market, it is important to understand how corporation tax affects your earnings and the decisions you make.
The UK uses a tiered tax system, where companies pay different rates based on their income. This directly impacts cash flow, growth, and profit retention. Corporation tax is essential for every business, whether you are just starting out, running a small business, or managing a large company.
UK Corporation Tax Rates
The UK no longer uses a single flat corporation tax rate. Your tax bill depends on how much profit you earn.
They use a tiered tax system, where you pay different tax rates based on your profit level.
Profit levels and their tax rates
| Profit Level | Tax Rate | Explanation |
| Up to £50,000 | 19% | Small profit rates for startups businesses |
| £50,001–£250,000 | 19%–25% | Marginal relief applies (gradual increase) |
| £250,000 or above | 25% | Full main rate for larger companies |
Understanding the bands
- 19% Rate: If your profit is around £50,000 or less. You pay 19%. That the small profit rates who start up their businesses.
- The Messy Middle (Marginal Relief): If your profit is between £50,001 and £250,000, you pay a higher effective tax rate through marginal relief (25%), but marginal relief cuts it down. You pay 19% on the first £50k, then 26.5% on everything above it. So your real rate creeps from 19% up to 25% as you get closer to £250k.
- 25% Rate: That is the main rate band for companies running medium to large businesses.
Uk Corporation Tax Deadlines
If you’re missing a deadline, HMRC doesn’t send a reminder. They send a penalty instead, and that can quickly affect your business cash flow and compliance status.
Key Deadlines
- Corporation tax payment: Due 9 months and 1 day after your year ends.
- Late payment: Interest applies at HMRC’s current rate (updated regularly)
Missing deadlines directly impacts your profits. It is important for business owners to double-check these deadlines, especially after the new tax year begins on 6 April.
You should review your records to see that all your bills are clear, confirm submission dates, and ensure everything is up-to-date. Staying active these days helps you avoid fines, reduce stress, and keep your business running smoothly without any legal penalties
Legal Tax Saving Strategies
Tax planning isn’t dodgy. It’s just using the relief HMRC already gives you. Do it before your year ends, not after. Once the year closes, you can’t claim.
1. Use your Annual investment allowance
Buying kits, vans or office furniture? Spend before year end and knock 100% off your profit.
● The AIA limit is £1,000,000 for 2025/26.
Example: If your profit is £60,000 and you purchase a £15k van. Buy it now. Your taxable profit drops to £45,000. This keeps you in the 19% band and save you £3,150.
2. Pay into your pension through the company
Your company can put up to £60,000 a year into your SIPP. It’s deductible for corporation tax, and there’s no national insurance. On the 25% rate, a £60k contribution cuts your tax bill by £15k. The money grows tax-free, and HMRC does not treat it as a benefit in kind.
3. Claims R&D Tax Credits if you innovate
Solving technical problems? Building software? Testing new manufacturing? You might qualify for SME R&D relief. From April 2024 the merged scheme gives back up to 27% of your costs.
Loads of Ashton-under-Lyne engineering firms qualify but never claim. Don’t assume you don’t. IF you are unsure, book our tax planning services in Ashton-under-Lyne, we can check your eligibility before your year-end and help you maximise your claims.
Next Steps Before Your Year End
Don’t wait till January when your accountants are buried in tax returns. If your year-end is coming up, do these three things.
1. Check if you’ve associated companies
Got dormant companies under the same owner? Close them before year end. Each one slashes your £50k and £250k tax bands. One extra company means your 19% band drops from £50k to £250k. That is an instant tax hike you don’t need.
2. Book a tax planning call
Corporation tax isn’t DIY once you hit marginal relief. R&D claims, salary vs dividends, capital allowances – it gets messy fast. If you’re running a limited company In Ashton-under-Lyne, speak to a local adviser who knows HMRC’s rules and your sector. They’ll model your exact savings before your yearend closes.
3. Set your payment reminder today
Your corporation tax is due 9 months and 1 day after year-end. Interest runs at 7.75% from 6 April 2025. HMRC won’t chase you. They’ll just add interest and penalties to your account.
Conclusion
The UK tax system punishes businesses that don’t plan. They reward the ones that do.
Early planning during the year can help influence your final tax position, as corporation tax is calculated after your accounting period ends and is due 9 months later. Waiting until the last minutes limits your options to manage it effectively.
Staying aware of current tax rates and deadlines helps you understand their effect on profits, avoid legal issues, and make better financial decisions for long-term success and stability.
That is why speaking to a qualified adviser is important. If you’re based in Ashton-under-Lyne: Get in touch with RMA Accountants. We make sure all available reliefs are claimed and deadlines are met, helping you stay compliant and manage cash flow more effectively.
