Self-Assessment Tax Calculator
Calculate your self-assessment tax liability with our comprehensive calculator. Determine tax owed, payment deadlines, and plan your finances based on your income and tax year.
Step 1: Income Details
Understanding Taxable Income
Taxable income includes all sources of income minus allowable deductions. Employment income, self-employment profits, dividends, interest, and rental income are all typically taxable.
Step 2: Deductions & Tax Year
About Tax Deductions
Allowable deductions reduce your taxable income. Pension contributions, legitimate business expenses, and charitable donations can significantly lower your tax liability.
Tax Calculation Results
Total Tax Liability
Tax Band Breakdown
| Tax Band | Income in Band | Tax Rate | Tax Amount |
|---|
Self-Assessment Payment Deadlines
Important Tax Dates
Payment deadlines vary by tax year. Late payments may result in penalties and interest charges. Always check official government sources for exact dates.
50% of previous year’s tax bill
Remaining 50% of previous year’s tax bill
Any remaining tax due for the year
Tax Calculation Formula
Taxable Income = Total Income – Personal Allowance – Allowable Deductions
Tax is calculated by applying different rates to portions of your income within each tax band. Personal allowance is the amount you can earn tax-free each year.
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