Self-Assessment Tax Calculator

Income Tax

• Personal Allowance: £12,570
• Basic Rate (20%): £12,571 - £50,270
• Higher Rate (40%): £50,271 - £125,140
• Additional Rate (45%): Over £125,140

National Insurance (Self-Employed)

• Class 2: Abolished for most self-employed since 2024/25 (voluntary contributions optional)
• Class 4: 6% on £12,570 - £50,270
• Class 4: 2% above £50,270

• Claim all allowable business expenses
• Contribute to a pension (tax relief at your marginal rate)
• Use your £1,000 trading allowance if applicable
• Consider ISA investments for tax-free growth
• Keep accurate records throughout the year

• GOV.UK Self Assessment
• Allowable Expenses
• Employed Take Home Pay