Confidential Corporation Tax Planner — No Business Data Stored
Plan your corporation tax for US and UK businesses. Calculate taxable profit, tax liability, effective rate, and marginal rate. All calculations are confidential and processed entirely in your browser — your financial data is never transmitted or stored.
How Corporation Tax Works
Corporation tax (corporate income tax) is levied on a company's profits after allowable expenses. The US uses a flat 21% federal rate, while the UK has a tiered system with a small profits rate (19%) and main rate (25%), with marginal relief for profits between £50,000 and £250,000.
US Corporate Tax Rate
- Federal Rate: Flat 21% on all taxable corporate profits
- State Rates: Vary from 0% (e.g., Wyoming, Nevada) to ~11.5% (New Jersey)
- Effective Rate: Federal + state, less deduction of state taxes on federal return
UK Corporation Tax Rates (2024/25)
- Small Profits Rate: 19% on profits up to £50,000
- Main Rate: 25% on profits above £250,000
- Marginal Relief Band: £50,000–£250,000 (effective rate 26.5% on profits in this band)
- Marginal Relief Formula: Main rate tax minus (£250,000 − profits) × (profits / profits) × 3/200
Allowable Expenses
Allowable expenses reduce your taxable profit. Common deductions include employee salaries, rent, utilities, professional services, marketing costs, depreciation (capital allowances), and research & development credits. Proper expense tracking can significantly reduce your tax liability.
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Your business profits, expenses, and tax calculations are processed entirely in your browser. No financial data is sent to any server, stored in any database, or shared with any third party. Your business intelligence remains confidential.