The Building Blocks of an Income Tax Calculation
Income tax in India is calculated on your total taxable income — your gross income from all sources (salary, business, capital gains, other income), minus any deductions and exemptions you’re eligible to claim. The resulting taxable income is then taxed according to slab rates, where different portions of your income are taxed at different rates, not a single flat rate on the whole amount.
Old Regime vs New Regime
India currently allows taxpayers to choose between two tax regimes each year (for salaried individuals; rules differ slightly for business income). The old regime has generally allowed a wider range of deductions and exemptions (such as HRA, various Section 80 investments, and more) in exchange for typically higher slab rates. The new regime generally offers lower slab rates but removes or limits most deductions and exemptions. Which one results in lower tax depends entirely on your specific income and how many deductions you’d otherwise claim — there’s no universally correct choice.
Why You Can’t Just Look Up ‘the’ Tax Rate
Slab rates and thresholds are set in each year’s Union Budget and can change — the exact numbers are exactly the kind of figure this guide won’t hard-code, since stating a specific rate here could quickly become outdated. Always calculate using the current year’s official slabs, either via the Income Tax Department’s own tools or a calculator that’s kept up to date.
Common Deductions Worth Understanding
Under the old regime, common deduction categories include Section 80C (investments like PPF, ELSS, life insurance premiums, up to a specified limit), HRA (House Rent Allowance, if you pay rent and receive it as part of your salary), and standard deduction for salaried employees. The new regime has progressively allowed a more limited set of deductions, primarily the standard deduction — checking the current year’s rules for exactly what’s allowed under each regime is essential before assuming a deduction applies.
A Practical Way to Decide
The most reliable way to compare the two regimes for your own situation is to calculate your tax liability under both, using your actual income and actual eligible deductions, and see which comes out lower. This is exactly what an income tax calculator is for — it removes the manual slab-by-slab arithmetic and lets you compare both regimes side by side using the current year’s actual rules.