Corporation Tax Returns
Corporation Tax Returns & Proactive Tax Planning for UK Limited Companies
Every UK company must file a corporation tax return within twelve months of its year end and pay any tax due nine months and one day after the period ends. Profits up to £50,000 are taxed at 19% and profits over £250,000 at 25%, with marginal relief in between. We file your return and plan around those bands.
Filing your corporation tax return on time is the minimum. What most accountants won’t tell you is how much tax you’re overpaying, year after year, because nobody is planning ahead. At Merit Accountants, we don’t just file your CT600. We implement a structured, year-round tax planning programme designed to legally reduce your corporation tax liability before it’s calculated.
We’ve saved UK businesses millions in corporation tax. Not by cutting corners, but by knowing where the reliefs are, when to use them, and how to structure your finances to work in your favour.
What Our Corporation Tax Service Includes
When you work with Merit Accountants, you receive a structured approach that goes far beyond the annual return:
✓ Monthly Tax Review
For businesses on our full-service packages, we monitor your profitability and tax position monthly, ensuring that no relief is missed and that your directors’ remuneration strategy remains optimised throughout the year.
✓ Quarterly Tax Health Checks
Every quarter, we review your year-to-date position against your projected year-end liability. If we spot an opportunity to make a pension contribution, bring forward a capital expenditure, or restructure a transaction, we tell you, with enough time to act.
✓ Pre-Year-End Tax Planning Meeting
This is where significant savings are made. In the weeks before your financial year closes, we meet with you to implement final tax-saving actions, timing of income and expenditure, dividend versus salary strategy, pension contributions, and any company restructuring that reduces your liability for the year being closed.
✓ Six-Monthly Strategic Reviews
At the halfway point of your financial year, we conduct a formal strategic tax review. This covers your projected corporation tax bill, any changes in HMRC legislation that affect you, available reliefs including R&D Tax Credits, Capital Allowances, and the Annual Investment Allowance, and any actions required before year-end.
✓ Year-End Accounts & CT600 Filing
Accurate, compliant statutory accounts and corporation tax return, filed on time with HMRC and Companies House.
CT600 Filing and Deadlines
The CT600 is the corporation tax return itself, filed with HMRC alongside your statutory accounts and a tax computation. All three go together and all three are filed digitally.
The deadlines are not the same as each other, which is what catches people out. The return is due twelve months after the end of your accounting period. The tax is due nine months and one day after it. The payment deadline arrives first, which is not the order most people expect.
Why Chartered Tax Advisers Make The Difference
Any qualified accountant can file a CT600. But a Chartered Tax Adviser (CTA), the UK’s highest tax qualification, understands the legislation at a level that goes far beyond standard accountancy training. Our managing partner holds CTA status and has direct experience working alongside HMRC, meaning they understand how HMRC approach corporation tax enquiries and what triggers them.
The result? You pay less tax. You stay compliant. And you never receive an unexpected HMRC letter that your accountant didn’t warn you about.
Corporation Tax Relief We Actively Identify For You
Most businesses are not claiming everything they’re entitled to. Our accountants routinely identify the following reliefs that clients’ previous accountants had missed:
✓ Research and Development (R&D) Tax Credits
If your business develops or improves products, processes or software, you may qualify for a significant tax reduction or cash credit. We have helped clients recover tens of thousands of pounds through R&D claims.
✓ Capital Allowances
Claiming the Annual Investment Allowance (AIA), writing-down allowances, and first-year allowances on qualifying plant, machinery, and commercial property expenditure.
✓ Director's Loan Account Optimisation
Ensuring loan account balances are managed to avoid the Section 455 tax charge.
✓ Dividend and Salary Structuring
Setting the most tax-efficient balance between salary and dividends for owner-managed companies, reviewed annually in line with current tax rates and personal allowance thresholds.
✓ Group Relief
For businesses with multiple entities, losses and allowances can often be transferred between companies to reduce the overall group tax burden.
Example. A company with £160,000 of taxable profit sits in the marginal band, where the effective rate on profit between £50,000 and £250,000 is 26.5%. A £25,000 employer pension contribution made before the year end reduces the corporation tax bill by £6,625, and the money stays with the director rather than going to HMRC. Made a fortnight after the year end, the same contribution saves nothing in that year. The decision is identical. Only the timing changed.
Testimonials
What Our Clients Say About Our Corporation Tax Service
We sincerely appreciate the trust, loyalty, and confidence our clients have placed in us throughout the years.
But don’t just take our word for it, check out our Google reviews below.
Speak to a Corporation Tax Specialist Today
Whether you’re a start-up filing your first return or an established business that suspects you’re paying too much tax, we’ll give you an honest assessment during our appointment. We serve businesses across Manchester, London, Hertfordshire, and throughout the UK.
Corporation Tax FAQs
Nine months and one day after the end of your accounting period, for companies with profits under £1.5m. The CT600 return is due twelve months after the period end, so payment falls due three months before filing does.
The corporation tax return form filed with HMRC. It goes in alongside your statutory accounts and a tax computation, and all three must be filed digitally.
The mechanism that tapers the corporation tax rate between the lower and upper profit thresholds. The practical effect is an effective marginal rate on profit in that band which is higher than the headline main rate.
Yes. No tax is payable on nil or negative profits, but the return is still required. Losses can often be carried back against earlier profits or carried forward, and it is worth claiming properly rather than leaving the relief unused.
An automatic penalty applies immediately, with further penalties as the delay extends. After six months HMRC estimates your bill and adds to it. Late payment attracts interest separately.
Very little. Almost every useful action has to happen before the year closes, which is why we hold the planning meeting two to three months beforehand rather than a review afterwards.
Both profit thresholds are divided by the number of associated companies under common control. Two companies means each gets half the threshold, which can push both into a higher effective rate on lower profits than the owner expects.
It allows the entire cost of qualifying new plant and machinery to be deducted from taxable profit in the year of purchase rather than spread over years. The timing relative to your year end decides which year the relief lands in.