India runs two parallel income-tax systems, and choosing the wrong one can cost tens of thousands of rupees a year. The decision also quietly drives a lot of "tax-saving" investment behaviour — often pointlessly. Here's how to decide, with actual numbers. (Figures reflect FY 2025-26 and exclude surcharge; confirm the current year's slabs and your own situation.)
The two regimes in one line each
- New regime (the default): lower slab rates, but almost no deductions — no 80C, no 80D, no HRA, no home-loan interest on a self-occupied house. It keeps the standard deduction (₹75,000 for salaried) and the employer NPS deduction, 80CCD(2).
- Old regime: higher slab rates, but you can claim the full suite of deductions.
The slabs (FY 2025-26)
New regime: nil up to ₹4 lakh; 5% on ₹4–8L; 10% on ₹8–12L; 15% on ₹12–16L; 20% on ₹16–20L; 25% on ₹20–24L; 30% above ₹24L. A Section 87A rebate makes income up to ₹12 lakh effectively tax-free (around ₹12.75 lakh for salaried after the standard deduction).
Old regime: nil up to ₹2.5 lakh; 5% on ₹2.5–5L; 20% on ₹5–10L; 30% above ₹10L. The 87A rebate here only covers income up to ₹5 lakh. Standard deduction is ₹50,000.
The new regime's rebate up to ₹12 lakh is the change (from Budget 2025) that flipped the maths for most taxpayers.
Worked example 1 — ₹12 lakh salary
For a salaried person earning ₹12 lakh, the new regime is hard to beat:
- New regime: after the ₹75,000 standard deduction, taxable income is ₹11.25 lakh — within the rebate band, so tax is effectively ₹0.
- Old regime: even with the full ₹1.5 lakh 80C, ₹25,000 of 80D, and the ₹50,000 standard deduction (₹2.25 lakh of deductions), taxable income is ₹9.75 lakh and tax works out to roughly ₹1.05 lakh before cess.
At this income, the new regime wins outright unless you have very large deductions (a big home-loan interest claim plus HRA).
Worked example 2 — ₹15 lakh salary
This is where it gets interesting.
- New regime: taxable ₹14.25 lakh (after ₹75,000 standard deduction). Tax ≈ ₹93,750 + 4% cess ≈ ₹97,500.
- Old regime, modest deductions (standard ₹50,000 + 80C ₹1.5L + 80D ₹25,000 + NPS 80CCD(1B) ₹50,000 = ₹2.75 lakh): taxable ₹12.25 lakh, tax ≈ ₹1.80 lakh + cess ≈ ₹1.87 lakh. The new regime wins by a wide margin.
- Old regime, heavy deductions (add ₹2 lakh home-loan interest and ~₹2 lakh HRA, total ~₹6.75 lakh): taxable ₹8.25 lakh, tax ≈ ₹77,500 + cess ≈ ₹80,600. Now the old regime edges ahead.
The lesson: at ₹15 lakh you need roughly ₹5 lakh or more of genuine deductions for the old regime to win. Many people don't have that — so the new regime usually wins.
The breakeven idea
Rather than memorise tables, think in terms of a breakeven deduction: at any income, there's a level of total deductions above which the old regime beats the new. Below it, the new regime wins. As income rises, that breakeven climbs — you need more deductions to justify the old regime. The practical implication is the same at almost every income level: the old regime only wins if you genuinely claim a large stack of deductions (typically full 80C + 80D + significant HRA and/or the ₹2 lakh home-loan interest).
What survives in the new regime
It's not literally "no deductions". Under the new regime you still get:
- The standard deduction (₹75,000 for salaried; ₹25,000 for family pension).
- Employer NPS, 80CCD(2) — deductible up to 14% of basic, a real benefit worth enabling.
- Employer contributions to EPF (within limits) and certain other specific items.
What you lose are the popular ones: 80C (EPF, PPF, ELSS, life insurance, principal repayment), 80D (health insurance), HRA, 80TTA/TTB, and self-occupied home-loan interest.
How (and when) to switch
- Salaried taxpayers can choose the regime every year — you're not locked in. Many declare one regime to their employer for TDS and finalise the other while filing, if it turns out cheaper.
- Business/professional income has stricter rules on switching back and forth.
- A useful habit: in January–February, run both regimes on your actual numbers (any reliable calculator or your CA does this in minutes) and pick the lower. Recompute each year, because your deductions and the slabs both change.
A note for higher incomes
At very high incomes, surcharge applies on top of the base tax, and here the new regime has an edge: its highest surcharge rate is capped lower (the 37% surcharge slab was removed under the new regime). For incomes above ₹2 crore, that cap can tilt the decision further toward the new regime — worth modelling specifically if it applies to you.
What this means for your investing
This is the part people miss, and it matters more than the tax saving itself: if you're on the new regime, 80C and 80D give you nothing. So —
- Don't buy ELSS, PPF top-ups, or (worst of all) insurance-cum-investment policies "to save tax" if you're on the new regime. There's no deduction to claim.
- Choose those instruments only on their own merits — ELSS if you want equity with a short lock-in, PPF for safe long-term debt, term insurance because you need cover.
- The classic, expensive mistake is buying a poor endowment or ULIP for an 80C benefit you can't even use.
The bottom line
For most salaried taxpayers without large home-loan or HRA claims, the new regime now wins — especially after Budget 2025 made income up to ₹12 lakh effectively tax-free. The old regime still rewards those who genuinely max out deductions. Run both on your real numbers once a year, choose the cheaper, and — critically — let your investments be driven by your goals, not by a deduction you may no longer be able to claim.