How Slab-Based Income Tax Works
Most countries use a progressive income tax system. Instead of one flat rate on all your income, income is divided into bands, or slabs, and each band is taxed at its own rate. Higher slabs carry higher rates, but those rates apply only to the part of your income that falls inside that slab.
Why this calculator lets you edit the slabs
Tax slabs differ between countries and are often revised every budget year. Some countries also offer more than one regime, or different slabs for salaried people, businesses or senior citizens. Rather than guess, this calculator lets you enter the slabs that apply to you, so it works anywhere and stays correct after each budget. The pre-filled slabs are an example only.
How to fill it in
- Find the official slab table for your country and tax year from your tax authority's website.
- Enter the upper limit and rate of each slab in order, from lowest to highest.
- Enter the rate for income above the last slab.
- Add any surcharge or cess that is charged as a percentage of tax.
- Enter deductions you're entitled to, so tax is calculated on taxable income.
Marginal vs effective tax rate
Your marginal rate is the rate on your last unit of income, the highest slab you reach. Your effective rate is total tax divided by total income, and it is always lower than the marginal rate in a slab system. A common misunderstanding is that moving into a higher slab makes you take home less. It doesn't: only the extra income above the limit is taxed at the higher rate.
What this calculator doesn't cover
- Rebates or credits that reduce tax after it is calculated
- Special rates for capital gains, dividends or other income types
- Social security or pension contributions deducted from salary
For filing, always rely on official tools or a qualified tax adviser. Use this calculator to plan and to understand how your tax is built up.