Income Tax Slabs 2026-27 — New vs Old Regime Explained
calendar_monthPublished 2026-04-10verified_userReviewed by Calculopedia editorial
India's income tax has a remarkable origin story. It was introduced in 1860 by James Wilson, the first Finance Minister of British India, who was borrowed from Britain to repair finances shattered by the Revolt of 1857 — making India one of the earliest non-Western territories to adopt a systematic, modern income tax. The core idea he imported — annual, slab-based, assessed income — is still recognisable in today's law.
Ask two people "how much tax will I pay on ₹15 lakh?" and you'll get two different answers. That's not because one of them is wrong — it's because India now runs two parallel income-tax systems (the new and the old regime), and the right one depends on the deductions you claim. Add in a slab system that's progressive rather than flat, and it's easy to overpay simply by not understanding the mechanics. Here's how to read Indian tax slabs properly — and how to pick a regime.
How slabs actually work — progressive, not flat
A "slab" is a band of income taxed at one rate. Indian income tax is progressive: only the portion of income that falls inside a slab is taxed at that slab's rate. Your top bracket rate is the marginal rate — it applies only to the rupees beyond that threshold, not your entire salary. The effective rate (total tax ÷ total income) is therefore always lower than the top slab rate you hear quoted.
One important rule to internalise: slabs are reset almost every budget. The Finance Minister can restructure the bands, the standard deduction and the rebate threshold year to year, and rates can differ between the two regimes. Everything below describes how the systems work — for the numbers in force this financial year, always confirm the current slab notification before doing final planning.
The two regimes in general terms
The old regime is the classic, long-standing structure: higher slab rates, but with the full menu of deductions — Section 80C (up to ₹1.5 lakh across PF, ELSS, life-insurance premiums, principal of home-loan EMI), 80D (health-insurance premiums for you and your family), HRA exemption, and home-loan interest (Section 24b). It rewards people who actively save and invest in tax-planned instruments.
The new regime was introduced as an option a few budgets ago (FY 2020-21) and made the default soon after (FY 2023-24). It offers lower slab rates but removes most exemptions and deductions — no 80C, no HRA exemption, no 80D concessions (with limited exceptions). In exchange, it carries a separate standard deduction and a broadly generous rebate that has made a substantial band of income effectively tax-free in recent years. Salaried employees get this regime by default and can switch at filing time if the old one is better.
| Feature | Old regime | New regime |
|---|---|---|
| Tax rates | Higher | Lower |
| Section 80C/80D deductions | Yes | No |
| HRA exemption | Yes | No |
| Standard deduction | Available | Available (separate, generally more generous) |
| Best if you… | Claim many deductions | Claim few or none |
Deciding which regime to choose
There's no universal winner — it's a numerical question, not an opinion question. Walk through this checklist:
- List your actual deductions. Total up 80C (PF, insurance, ELSS), 80D, HRA you can genuinely claim, and home-loan interest.
- Compute tax under both regimes. Use each system's slabs and the standard deduction.
- Pick the lower. If your deduction stack is thick (₹1.5 lakh or more in 80C, plus HRA and 80D), the old regime frequently wins. If you're a salaried earner with a modest deduction stack, the new regime's lower rates usually win.
As a rough guide: someone with little beyond EPF and a standard deduction almost always does better in the new regime; someone maxing 80C and paying rent and servicing a home loan should test the old regime carefully.
The rebate that quietly erases your tax
The Section 87A rebate is arguably the most powerful line in the new regime: it refunds tax due when taxable income falls at or below a threshold band, making that entire band effectively tax-free. The specific threshold has moved over successive budgets, so treat the concept as permanent and the number as changing. The rebate is why many middle-income salaried professionals in the new regime owe zero tax despite earning far above the basic exemption limit.
Worked example (illustrative slabs)
Because slabs change every budget, the cleanest way to understand is a worked example with clearly illustrative rates — a structure close to recent years' new-regime pattern (roughly 0% up to a basic exemption, then 5%, 10%, 15%, 20%, 25% and 30% at successive thresholds, plus a 4% health-and-education cess on the tax computed).
Take ₹15,00,000 gross salary, new regime, with a ₹75,000 standard deduction, and imagine the taxable income splits across the illustrative bands like this:
| Income band (illustrative) | Rate | Tax |
|---|---|---|
| First ₹4,00,000 | 0% | ₹0 |
| Next ₹4,00,000 | 5% | ₹20,000 |
| Next ₹4,00,000 | 10% | ₹40,000 |
| Remaining ₹2,25,000 | 15% | ₹33,750 |
| Slab tax | ₹93,750 | |
| Add 4% cess | ~₹3,750 | |
| Total tax | ~₹97,500 |
The key insight: the taxpayer's marginal band might be 15%, but the effective bite is only ~6.5% of gross income — a fraction of what a flat "30% TDS" panic would suggest. That gap between marginal and effective is the single most misunderstood number in Indian personal taxation. Notice also how each band is taxed independently: the "next ₹4,00,000 at 5%" changes nothing about the untaxed first ₹4,00,000.
Common mistakes
- Panicking over the "top" slab. Nobody pays 30% on their whole salary; only the income above the top threshold does.
- Blending regimes. Don't claim old-regime deductions (like 80C) inside new-regime calculations — the rules are mutually exclusive.
- Ignoring cess and surcharge. Cess is ~4% on the computed tax; high earners may also pay a surcharge that dividend calculators forget.
- Forgetting that slabs reset each year. Plan with current notifications, not last year's memory.
Key takeaways
- Tax is progressive: only the income within each slab is taxed at that slab's rate.
- Two regimes coexist — new (lower rates, few deductions) vs old (higher rates, full deductions); choose the cheaper one after itemizing.
- The 87A rebate can make a wide income band tax-free — check the current threshold.
- Effective rate ≠ marginal rate. Always compare the same income under both regimes before deciding.
Frequently asked questions
Can I switch regimes every year? Generally yes, at filing time for salary income. If you have business income, regime choice needs more care — changing back and forth is constrained.
Do my PF and insurance still help in the new regime? Those are savings in their own right, but they no longer reduce taxable income the way 80C did in the old regime. You get the benefit of discipline, not a tax break.
Where do rebel claims and HRA go in the new regime? Nowhere — that's the core trade-off. New regime's bet is that lower rates beat your deductions. Run your exact numbers through the Income Tax Calculator and compare your net salary via the Take-Home Pay Calculator.