14 Sep 2026
With Corporation Tax rates now varying depending on a company's level of profits, it's important to make sure you're paying the correct amount and not accidentally overpaying or underpaying HMRC.
For many limited companies, determining the applicable rate is no longer as straightforward as it once was. The amount of Corporation Tax due depends on your taxable profits, and in some cases, the number of associated companies within your group structure can also affect the calculation.
Understanding Corporation Tax Rates
The main Corporation Tax rate is 25% and generally applies to companies with taxable profits above £250,000.
Companies with profits of £50,000 or less typically qualify for the small profits rate of 19%.
If your profits fall between £50,000 and £250,000, things become more complicated. Rather than facing an immediate jump from 19% to 25%, companies benefit from marginal relief, which gradually increases the effective rate as profits rise.
This means that a business making just over £50,000 won't suddenly pay 25% on all of its profits. Instead, the tax rate increases progressively until it approaches the full 25% rate as profits near £250,000.
Corporation Tax is initially calculated at 25%, with marginal relief then reducing the liability. The relief is calculated using a standard fraction of 3/200.
Don't Forget About Associated Companies
One area that often catches businesses out is the associated company rules.
The £50,000 and £250,000 profit thresholds are divided by the number of associated companies. This means that a company with one or more associated businesses could reach the higher Corporation Tax rates sooner than expected.
As a result, your profit figure alone may not determine the rate you pay. It's important to review your wider company structure to ensure the correct calculation is being applied.
What If Your Company Hasn't Started Trading Yet?
Many company directors assume Corporation Tax isn't relevant until their business starts generating income. While a dormant company with no trading activity will generally have no Corporation Tax to pay, there are still important responsibilities to consider.
A newly incorporated company may be classed as dormant if it has not yet started trading or receiving income. Even so, HMRC and Companies House may still require filings and updates depending on the company's circumstances.
If your company is preparing to launch, making initial investments, or incurring pre-trading costs, it can be beneficial to seek advice early. Certain expenses incurred before trading begins may be eligible for tax relief once the business starts operating.
Understanding your position from day one can help avoid surprises and ensure you're making the most of available tax planning opportunities.
How Charlton Baker Can Help
At Charlton Baker, we help businesses navigate Corporation Tax with confidence. Whether you're an established company, part of a group structure, or preparing to launch a new venture, our tax specialists can provide practical advice tailored to your circumstances. Call our friendly and expert team on 01380 723692 or email here.