PERSONAL FINANCE

What Is a Tax Slab? How India’s Layered Income Tax System Actually Works

VC By Victor Cranson · July 3, 2026 · 4 min read

A tax slab is an income range taxed at a specific rate under India’s progressive income tax system. Rather than applying a single flat rate to your entire income, the Income Tax Act divides income into successive bands, or slabs, each taxed at an increasing rate as income rises. Only the portion of income that falls within a given slab is taxed at that slab’s rate; income below it was already accounted for in the lower slabs.

India currently offers taxpayers a choice between two parallel sets of tax slabs: the new tax regime (the default option since recent budget changes) and the old tax regime (available if you choose to opt into it), each with different slab boundaries and rates.

How slab-based taxation actually works, with numbers

Say the new regime’s slabs (illustrative structure applicable from FY 2025-26) are: no tax up to ₹4 lakh, 5% on income between ₹4 lakh and ₹8 lakh, 10% between ₹8 lakh and ₹12 lakh, and progressively higher rates on subsequent bands up to 30% on income above ₹24 lakh. If your taxable income is ₹10 lakh, you don’t pay 10% on the entire ₹10 lakh. You pay 0% on the first ₹4 lakh, 5% on the next ₹4 lakh (from ₹4 lakh to ₹8 lakh), and 10% only on the remaining ₹2 lakh (from ₹8 lakh to ₹10 lakh). Your total tax is the sum of tax owed across each slab your income actually passed through, not a single rate applied to the whole amount.

Because slabs, rates, and rebate thresholds are revised almost every Union Budget, the specific numbers above should always be checked against the current financial year’s notified slabs on the Income Tax Department’s website before relying on them for actual filing or planning.

Why moving into a higher slab never reduces your take-home pay

This is the most common misconception about tax slabs: people sometimes worry that a raise or bonus pushing them into a higher slab will leave them with less money overall than before the raise. Because only the incremental income above each threshold is taxed at the higher rate, and everything below that threshold continues to be taxed at the lower rates it always was, your total tax as a percentage of income rises only gradually and only on the additional income earned. A raise can never mathematically leave you with less take-home pay under a properly structured progressive slab system; at worst, a larger portion of just the additional income gets taxed at a higher rate.

Old regime slabs versus new regime slabs

The old regime has different, generally wider, slab boundaries with correspondingly different rates, but allows a much broader range of deductions and exemptions (Section 80C, HRA, home loan interest, and others) that reduce the taxable income the slabs are actually applied to. The new regime has more slabs with lower rates at each step and a higher basic exemption, but very limited deductions. Which regime results in lower actual tax depends on how much you’d otherwise claim in deductions under the old regime; the slab rates alone don’t tell the whole story without factoring in what taxable income each regime actually leaves you with.

Rebate under Section 87A

Separately from the slab structure itself, Section 87A provides a rebate that can reduce your tax liability to zero if your total taxable income falls at or below a specified threshold, currently ₹12 lakh under the new regime (subject to conditions and periodic revision) for FY 2025-26. This is why someone can have taxable income that technically falls into a taxed slab, yet still owe no net tax after the rebate is applied, another detail that trips people up when comparing their expected tax to what the slab rates alone would suggest.

Bottom Line

A tax slab is simply a defined income band taxed at its own specific rate, layered so that only the income within each band is taxed at that band’s rate, never your entire income at the highest rate you’ve reached. Because slab boundaries, rates, and rebate thresholds shift with nearly every budget, and because the right regime depends on your specific deductions, it’s worth recalculating which regime and which resulting tax figure actually applies to you each year, rather than assuming last year’s numbers still hold.

This article is for general information and isn’t personalized tax advice. Confirm the current financial year’s slabs and rebate thresholds on the Income Tax Department’s official portal.