Old Regime vs New Regime 2025-26 — I Did the Math So You Don't Have To
The one number that decides which regime is better for you — plus real examples at ₹8L, ₹12L, and ₹18L CTC.
Last November, my colleague Priya showed up to our team lunch looking annoyed. She'd just come from a meeting with HR about her Form 16, and apparently she'd been paying more tax than she needed to — for three years straight.
"Nobody told me I should switch to new regime," she said, poking at her biryani. "I just assumed old regime was better because that's what my parents always said."
She was losing about ₹18,000 per year. Not life-changing money, but also not nothing. Three years of that is ₹54,000 gone for no reason.
The old vs new regime debate is genuinely confusing. Every article about it either gives you a wall of tax slabs without context, or tells you to "consult a CA" — which doesn't actually help you make a decision right now. Let me try to actually explain it.
What changed in Budget 2025
The government made significant changes to the new regime in the Union Budget 2025 (for FY 2025-26). The headline change: if your taxable income is ₹12 lakhs or below, you pay zero tax under the new regime.
That's not a typo. Up to ₹12 lakhs — zero. This is because of an enhanced rebate under Section 87A.
Before Budget 2025, the new regime's 87A rebate covered income up to ₹7 lakhs. So someone earning ₹10 lakhs taxable income was paying about ₹54,000 in tax. Now they pay nothing. That's a big deal.
The new regime slabs for FY 2025-26 are:
| Income Slab | Tax Rate (New Regime) |
|---|---|
| Up to ₹4 lakhs | 0% |
| ₹4–8 lakhs | 5% |
| ₹8–12 lakhs | 10% |
| ₹12–16 lakhs | 15% |
| ₹16–20 lakhs | 20% |
| ₹20–24 lakhs | 25% |
| Above ₹24 lakhs | 30% |
Plus ₹75,000 standard deduction. So if your gross salary is ₹12.75 lakhs, your taxable income under new regime is ₹12 lakhs — and you pay zero tax.
The old regime in 30 seconds
The old regime has higher tax rates but allows deductions. The main ones:
- Standard deduction: ₹50,000
- Section 80C: Up to ₹1.5 lakhs — PF, ELSS, PPF, LIC, home loan principal
- Section 80D: Up to ₹25,000 for health insurance premiums
- HRA exemption: If you pay rent, a portion of your HRA is tax-free
- NPS (80CCD 1B): Extra ₹50,000 deduction for NPS contributions
- Home loan interest (Section 24B): Up to ₹2 lakhs
The old regime tax slabs: 0% up to ₹2.5L, 5% from ₹2.5–5L, 20% from ₹5–10L, 30% above ₹10L. These rates are higher, but the deductions can bring your taxable income down significantly.
The number that decides everything
Here's how I explain it to people: calculate your total deductions in the old regime. If they're above a certain threshold, old regime wins. If not, new regime wins.
That threshold varies by salary. Let me show you with real examples.
Example 1: ₹10 LPA salary
New regime: Gross ₹10L, minus ₹75K standard deduction = ₹9.25L taxable. Under new regime, taxable income below ₹12L = zero tax. Tax: ₹0.
Old regime: Gross ₹10L, minus ₹50K standard deduction, minus ₹1.5L (80C), minus ₹25K (80D) = ₹7.75L taxable. Tax on that: roughly ₹75,000.
Wait — new regime wins here by a lot, even without any deductions. That's the power of the ₹12L rebate.
At ₹10 LPA, you'd have to be doing something exceptional in old regime deductions to beat zero tax.
Example 2: ₹15 LPA salary
Now it gets interesting.
New regime: ₹15L minus ₹75K = ₹14.25L taxable. Tax: roughly ₹1.41 lakhs.
Old regime with decent deductions (₹50K standard + ₹1.5L 80C + ₹25K 80D + ₹1L HRA exemption): ₹15L minus ₹3.25L = ₹11.75L taxable. Tax: roughly ₹1.79 lakhs.
New regime still wins at ₹15L even with ₹3.25L in deductions.
Old regime with maximum deductions (add ₹50K NPS + ₹2L home loan interest = ₹5.75L total): Taxable = ₹9.25L. Tax: about ₹88,000.
Now old regime wins — but only if you're actually doing all of those things: PF + ELSS + health insurance + HRA claim + NPS contribution + home loan.
Example 3: ₹25 LPA salary
At higher salaries, old regime often becomes more competitive because the 30% slab kicks in and deductions save you more per rupee.
New regime: ₹25L minus ₹75K = ₹24.25L taxable. Tax: roughly ₹4.35 lakhs.
Old regime with maximum deductions (₹50K + ₹1.5L + ₹25K + ₹50K NPS + ₹2L HRA + ₹2L home loan interest = ₹6.75L): Taxable = ₹18.25L. Tax: roughly ₹3.6 lakhs.
Old regime saves ₹75,000 — but only if you're actually maximising every deduction.
The honest summary
For most salaried people under ₹12-13 LPA gross salary: new regime almost certainly wins after Budget 2025. The zero-tax-up-to-₹12L rebate is too powerful to beat without extraordinary deductions.
For people earning ₹15-20 LPA: it's genuinely case-by-case. Run your actual numbers.
For people above ₹20 LPA with a home loan, NPS, and full deductions: old regime might still win, but check carefully.
One thing everyone gets wrong
People often compare the total deductions they're eligible for without checking whether they're actually using them. You may be "eligible" for ₹1.5L under 80C but only actually have ₹60K in PF + ₹20K in LIC = ₹80K. That changes the comparison significantly.
The calculator at the bottom of this post lets you enter your exact numbers. It's worth spending five minutes with it. My colleague Priya did and switched to new regime immediately. Saves her about ₹1,500 a month going forward.
Three years too late, but better than never.
See exactly how much you save under each regime with your actual salary, deductions and location. Old vs new comparison built in.
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