The headline everyone got half right
Every year around Budget time, a number does the rounds on WhatsApp: "₹12 lakh income, zero tax." This year it's actually true — but almost nobody explains why, and that gap is exactly where taxpayers get tripped up.
Budget 2025 did two things to the new tax regime. First, it revised the slabs: nil up to ₹4 lakh, 5% on ₹4–8 lakh, 10% on ₹8–12 lakh, 15% on ₹12–16 lakh, 20% on ₹16–20 lakh, 25% on ₹20–24 lakh, and 30% above ₹24 lakh. Second — and this is the part that actually creates the ₹12 lakh headline — it raised the Section 87A rebate so that if your total income under the new regime is up to ₹12 lakh, the rebate wipes out your entire tax liability. Net tax payable: zero.
That second point is a rebate, not a slab change. And rebates work very differently from slabs. That difference is where the "trap" lives.
Why it's called a trap
Here's the mechanics most explainers skip. A slab system is smooth — you only ever pay the higher rate on the portion of income that falls into the higher band. A rebate is not smooth. It is a threshold: cross it, and you don't just lose the rebate on the amount above ₹12 lakh — depending on how the computation works out, you can end up owing tax computed on your entire income under the new slab structure, not just the slice above ₹12 lakh.
In plain terms: someone earning exactly ₹12 lakh can owe nothing, while someone earning a little more can suddenly owe a meaningful amount of tax — and that jump can look disproportionate to the small rise in income that triggered it. This is the classic character of a rebate cliff, and it is precisely why marginal relief provisions exist in the law: their purpose is to cap the tax at roughly the amount of income by which you exceeded the threshold, so the increase in tax owed doesn't outrun the increase in income. If you're sitting near the ₹12 lakh mark, marginal relief is the provision your CA should be checking on your specific numbers before you assume either "zero tax" or "the full slab hit" applies to you.
The practical takeaway: if your income is expected to land close to ₹12 lakh, don't just look at your gross number — look at where you actually land after all inclusions, because a few thousand rupees of difference near that line matters more than it would anywhere else in the schedule.
The rebate doesn't cover everything
One more nuance that gets flattened in the viral version of this story: the enhanced 87A rebate applies to income taxed at the normal new-regime slab rates. It does not extend to income that is taxed at special or slab-exception rates — certain categories of capital gains being the clearest example. So if a chunk of your ₹12 lakh includes gains taxed at a special rate, you cannot assume the whole amount rides the rebate to zero tax. This is a case where the specific composition of your income, not just the total, decides the outcome.
Old regime is not dead
The other half-truth floating around is that the new regime is now simply "better" for everyone. It isn't a universal answer — it's a comparison. The old regime still exists, with its own separate slab structure, and it remains genuinely competitive for taxpayers who claim substantial deductions: Section 80C investments, 80D health insurance, HRA, home loan interest, and the rest of the deduction stack that the new regime largely does away with. If your deduction claims are large enough, the old regime's lower effective tax on a smaller taxable base can still beat the new regime's headline rebate.
There is no shortcut here that replaces an actual computation under both regimes for your specific income mix, deductions, and any special-rate income you may have.
So what should you actually do
- Don't anchor on the ₹12 lakh number as a personal promise of zero tax — check where your total income, including any special-rate items, actually lands.
- If you're near the ₹12 lakh line, get the marginal relief computation run on your actual figures before assuming either the best case or the worst case.
- If you claim large deductions (80C, 80D, HRA, home loan interest), run the old-regime numbers too — the "new regime wins" narrative isn't universal.
- Treat this as an annual decision, not a one-time switch, since your income mix and deduction claims can change the answer year to year.