ltd company tax calculator - Aaron Graves, PhDude Replica

UK Ltd Company Tax Calculator

Use this quick calculator to estimate your limited company corporation tax, effective tax rate, and post-tax profit.

Turnover / Revenue (£)

Allowable Business Expenses (£)

Exclude salaries if you enter them separately below.

Salaries (including director salary) (£)

Employer Pension Contributions (£)

Brought-Forward Losses Used This Year (£)

Exempt Dividends Received (£)

Used for marginal relief (augmented profits estimate).

Number of Associated Companies

Lower and upper limits are divided by this number.

Planned Dividends to Shareholders (£)

This ltd company tax calculator gives an estimate based on UK corporation tax rates (small profits rate, main rate, and marginal relief approach). It does not replace professional accounting or tax advice.

How this ltd company tax calculator works

This tool is designed for UK limited companies that want a quick estimate of corporation tax and remaining profit. It takes your turnover and subtracts key costs such as allowable expenses, salaries, and employer pension contributions. It then applies corporation tax rules to estimate the tax due.

If your business profits fall between the lower and upper limits, the calculator applies a marginal relief estimate. It also adjusts those limits when you have associated companies.

Step-by-step calculation flow

Calculate accounting profit before losses.
Subtract brought-forward losses used in the period.
Estimate taxable profits (cannot go below zero).
Apply small profits rate, main rate, or marginal relief estimate.
Show post-tax profit and impact of planned dividends.

What to enter in each field

Turnover / Revenue

Total income earned by your company in the accounting period before costs.

Allowable Business Expenses

Ordinary business costs that are usually deductible for corporation tax purposes, such as software, insurance, office costs, and professional fees.

Salaries and Pension

Enter total salary costs and employer pension contributions. These typically reduce taxable profit when allowable.

Brought-Forward Losses

Losses from earlier years that you are using to reduce current taxable profits.

Associated Companies

If your company is associated with other companies, the profit thresholds for corporation tax bands are shared and reduced accordingly.

Example: quick corporation tax estimate

Suppose your company has £120,000 revenue, £25,000 expenses, and £12,570 salary. Accounting profit before losses is £82,430. If no losses are used, taxable profit is also £82,430.

At that level, many companies sit in the marginal zone rather than pure small-profits or main-rate treatment. This calculator estimates the resulting corporation tax and effective rate, then shows how much profit is left for reinvestment or dividends.

Common mistakes when using a limited company tax calculator

Mixing personal and company costs.
Double-counting salary in both expenses and salary fields.
Ignoring associated companies when applying thresholds.
Assuming dividend tax for shareholders is included here (it is not).

Important notes

This calculator is an estimate for planning purposes and is not a substitute for a full tax computation. Real-world corporation tax may differ based on disallowable costs, capital allowances, R&D relief, group structures, timing differences, and changes in legislation.

For filing and compliance decisions, always confirm numbers with a qualified accountant or tax adviser.