Get a Free Quote →
🏢 Corporation Tax 2025/26

Corporation Tax
Calculator

Calculate your UK Corporation Tax bill instantly — including marginal relief for profits between £50,000 and £250,000.

📅 Tax Year 2025/26 🇬🇧 UK Companies 📊 Marginal Relief 💼 Small & Main Rate
£0 Taxable Profit
£0 CT Due
0% Effective Rate
£0 Profit After Tax
Step 1

Enter Your Details

Enter your company's taxable profit for the year. We'll calculate the Corporation Tax due and show you which rate applies.

💰 Company Profits

£
Your company's profit after allowable deductions, before Corporation Tax
Enter the number of associated companies (not including this one). Each one divides the thresholds proportionally
Short accounting periods reduce the thresholds proportionally

⚙️ Options

💡

This calculator uses the current Corporation Tax rates: 19% small profits rate (up to £50k), 25% main rate (over £250k), with marginal relief for profits in between.

Results

Your Corporation Tax

Based on the details you've entered for 2025/26.

Tax Breakdown

How your Corporation Tax is calculated

Income
Gross Profit £0
Taxable Profit £0
Tax Calculation
Rate Applied 19%
Corporation Tax Due £0
Profit After Tax £0
Effective Tax Rate 0%

Rate Bands 2025/26

Your profit falls in the highlighted band

Small Profits Rate 19%
Profits up to £50,000
Marginal Relief Zone 19–25%
Profits £50,001 – £250,000
Main Rate 25%
Profits over £250,000

⚖️ Marginal Relief Applies

Your profit falls between the small profits lower limit and the main rate upper limit. HMRC applies Marginal Relief — a tapering deduction that gradually increases your effective rate from 19% to 25%.

The formula: Marginal Relief = (Upper Limit − Profit) × (Profit / Upper Limit) × 3/200

📊 What If Your Profit Was Different?

See how your Corporation Tax changes at different profit levels.

📅 When Is Corporation Tax Due?

Enter your accounting year-end to see your key deadlines.

📋
Corporation Tax Return (CT600) due 12 months after your accounting year-end
—
💰
Corporation Tax payment due 9 months and 1 day after your accounting year-end
—
📁
Statutory accounts filing deadline 9 months after year-end (Companies House)
—

Want us to handle your Corporation Tax?

We'll make sure you're claiming every allowance you're entitled to and never miss a deadline.

Get a Free Quote 💬 WhatsApp Us
⚠️ These figures are estimates based on confirmed HMRC rates for the selected tax year. Individual circumstances vary — losses, reliefs, group relief, research & development claims and other factors can affect your Corporation Tax liability. This calculator does not constitute financial or tax advice. Always speak to a qualified accountant before making decisions based on these figures.