About the old vs new regime decision
From FY 2023-24 onwards, India operates two parallel personal income tax systems. The new regime (Section 115BAC) is the default and offers lower slab rates plus a much higher Section 87A rebate (zero tax up to Rs 12 lakh of total income, Rs 12.75 lakh including the Rs 75,000 standard deduction). In exchange, almost all common deductions are disabled: HRA exemption, Section 80C investments, Section 80D health premium, Section 24(b) home loan interest, Section 80CCD(1B) additional NPS, professional tax and leave travel allowance all stop working. The old regime keeps every deduction intact but charges higher slab rates and caps the 87A rebate at Rs 5 lakh of taxable income. The question on every salaried Indian's mind is which one to pick for FY 2025-26: the answer depends entirely on how many genuine deductions you actually claim.
How the math works
New regime tax = slab tax (0/5/10/15/20/25/30% on FY 2025-26 slabs) on (gross − Rs 75K std deduction) + 4% cess, less 87A rebate if total income ≤ Rs 12L.
Winner = the regime with lower final tax. Savings = |new tax − old tax|.
- Compute HRA exemption using the standard formula: minimum of (a) actual HRA received, (b) 50% basic if metro / 40% if non-metro, (c) rent paid minus 10% basic. We assume basic = 40% of gross salary for the calculation.
- Cap each deduction at its statutory limit: Section 80C at Rs 1,50,000, Section 80D at Rs 25,000 (Rs 50,000 with senior parents), Section 24(b) at Rs 2,00,000, Section 80CCD(1B) at Rs 50,000.
- Compute the old regime taxable income: gross − Rs 50K standard deduction − all allowable deductions. Apply old slabs (0% to Rs 2.5L, 5% to Rs 5L, 20% to Rs 10L, 30% above Rs 10L).
- Compute the new regime taxable income: gross − Rs 75K standard deduction (no other deductions). Apply new slabs (0% to Rs 4L, 5% to Rs 8L, 10% to Rs 12L, 15% to Rs 16L, 20% to Rs 20L, 25% to Rs 24L, 30% above Rs 24L).
- Apply the Section 87A rebate: if old-regime taxable ≤ Rs 5L, rebate equals the entire tax (max Rs 12,500). If new-regime total income ≤ Rs 12L, rebate is the entire tax (max Rs 60,000 at the boundary).
- Add 4% health and education cess on the post-rebate tax. Surcharge kicks in only above Rs 50 lakh income (not modelled in this simplified quiz).
The formula explained
This quiz applies five chained formulas to produce the regime recommendation:
1. HRA exemption = min(actual HRA, 0.50 × basic if metro else 0.40 × basic, rent × 12 − 0.10 × basic)
2. Old taxable = gross − 50,000 − HRA exemption − min(loan interest, 2,00,000) − min(80C, 1,50,000) − min(80D, 25K-50K) − min(NPS, 50,000)
3. New taxable = gross − 75,000
4. Old tax = slab(2.5L, 5L, 10L) → if taxable ≤ 5,00,000 then rebate = tax, else 0. cess = 0.04 × (tax − rebate).
5. New tax = slab(4L, 8L, 12L, 16L, 20L, 24L) → if total income ≤ 12,00,000 then rebate = tax, else marginal relief above 12L. cess = 0.04 × (tax − rebate).
The marginal rate on the new regime jumps sharply at Rs 12 lakh because the rebate ends. Marginal relief under Section 87A protects taxpayers just above Rs 12 lakh so that an extra rupee of income never costs more than a rupee of tax. The cut-over point where the old regime beats the new regime is usually around Rs 4 lakh of total deductions, but it depends on whether HRA is large enough to dominate.
Worked example: Rs 15,00,000 gross with full deductions
A 30-year-old salaried professional in Mumbai earning Rs 15,00,000 gross with rent Rs 35,000 per month, Rs 1,80,000 home loan interest on a second-property, Rs 1,50,000 in 80C investments and Rs 25,000 80D premium.
- Basic salary (assumed 40% of gross): Rs 6,00,000.
- HRA exemption = min(actual HRA, 50% basic = Rs 3L, rent − 10% basic = Rs 4.2L − Rs 60K = Rs 3.6L) → about Rs 3,00,000 (capped by the 50% basic limit in a metro).
- Old regime taxable: Rs 15L − Rs 50K std − Rs 3L HRA − Rs 1.8L 24b − Rs 1.5L 80C − Rs 25K 80D = Rs 7,95,000.
- Old regime tax: Rs 12,500 (5% slab on Rs 2.5L) + Rs 59,000 (20% slab on Rs 2.95L) = Rs 71,500 + 4% cess Rs 2,860 = Rs 74,360.
- New regime taxable: Rs 15L − Rs 75K = Rs 14,25,000.
- New regime tax: Rs 20K (5% slab on Rs 4L from Rs 4L to 8L) + Rs 40K (10% slab on Rs 4L from Rs 8L to 12L) + Rs 33,750 (15% slab on Rs 2.25L from Rs 12L to Rs 14.25L) = Rs 93,750 + 4% cess Rs 3,750 = Rs 97,500.
- Winner: old regime saves about Rs 23,000. The combination of full HRA, home loan interest and 80C tips the balance.
Cut-over points: where the old regime starts winning
For different income levels, here is roughly how much total deductions (HRA + 80C + 80D + 24b + 80CCD(1B)) you need before the old regime overtakes the new regime in FY 2025-26.
| Gross income | Break-even deductions | Why |
|---|---|---|
| Up to Rs 7.5L | Never (new wins) | 87A rebate makes new-regime tax zero up to Rs 12L total income. |
| Rs 10L | Roughly Rs 3,50,000 | 87A still helps if income with deductions stays under Rs 5L old-regime taxable. |
| Rs 15L | Roughly Rs 3,75,000 | Old slab 20% beats new slab 15% above Rs 12L taxable when deductions are large enough. |
| Rs 20L | Roughly Rs 4,25,000 | Difference between 20% old slab and 20% new slab is now small, so the cut-over moves up. |
| Rs 30L | Roughly Rs 4,50,000 | 30% slab kicks in earlier under the old regime (above Rs 10L vs Rs 24L in the new). |
| Rs 50L+ | Roughly Rs 4,50,000+ | Surcharge kicks in. New regime caps surcharge at 25% (vs 37% old). |
Common mistakes when picking a regime
- Forgetting HRA only works in old. Many people in metros assume their HRA exemption is "automatic" and pick the new regime by default. They lose Rs 2-3 lakh of exemption in one decision.
- Counting the Rs 1.5 lakh 80C limit but not making the actual investments. The deduction only counts if the money is genuinely paid into PPF, ELSS, EPF, life insurance, ULIP or tax-saver FD before March 31.
- Missing the Section 24b cap. Self-occupied house loan interest deduction is capped at Rs 2,00,000. Higher loan interest only helps for let-out property (where it can offset rental income with no upper cap on interest, but the overall loss set-off is restricted to Rs 2 lakh under Section 71).
- Counting employer NPS twice. Section 80CCD(1B) is the Rs 50,000 additional for personal NPS contribution. Section 80CCD(2) is the employer's NPS contribution (allowed in both regimes, but not capped by the same limit).
- Ignoring the new regime's marginal relief. Above Rs 12 lakh, the 87A rebate disappears but marginal relief ensures that an extra rupee of income never increases tax by more than that rupee. Don't artificially cap your salary just to stay under Rs 12 lakh.
Old vs new regime quick reference
| Feature | Old regime | New regime (FY 2025-26) |
|---|---|---|
| Standard deduction | Rs 50,000 | Rs 75,000 |
| 87A rebate threshold | Rs 5 lakh taxable | Rs 12 lakh total income |
| HRA exemption | Yes (Section 10(13A)) | No |
| Home loan interest | Up to Rs 2L Section 24(b) | No (self-occupied) |
| 80C deductions | Up to Rs 1.5L | No |
| 80D health insurance | Up to Rs 25K-Rs 1L | No |
| 80CCD(1B) NPS | Rs 50,000 | No |
| Employer NPS 80CCD(2) | 10% of basic | 14% of basic |
| Maximum surcharge | 37% above Rs 5Cr | 25% above Rs 2Cr |
Frequently asked questions
What is the Section 87A rebate threshold under each regime?
Under the new regime for FY 2025-26, the Section 87A rebate makes income tax zero if total taxable income is up to Rs 12 lakh (Rs 12.75 lakh including the Rs 75,000 standard deduction). Under the old regime the Section 87A threshold remains Rs 5 lakh, so old-regime rebate disappears as soon as taxable income crosses Rs 5 lakh. This makes the new regime almost unbeatable for incomes between Rs 7 lakh and Rs 12.75 lakh with low deductions.
Can I claim HRA exemption under the new regime?
No. HRA exemption under Section 10(13A) is not allowed in the new tax regime. If you live on rent and have a meaningful HRA component, this is a major reason the old regime can still win for many salaried taxpayers in Mumbai, Delhi, Bengaluru, Hyderabad and other rent-heavy cities. The bigger your HRA exemption, the more attractive the old regime becomes.
When does the old regime usually win over the new regime?
The old regime usually wins when your total deductions (HRA exemption + Section 80C + Section 80D + Section 24b home loan interest + Section 80CCD(1B) NPS) exceed roughly Rs 4 lakh to Rs 4.5 lakh per year. Above that break-even, the lower old-regime taxable income beats the lower new-regime slab rates. The exact cut-over depends on income level: at Rs 15 lakh gross the break-even is around Rs 3.75 lakh deductions; at Rs 25 lakh gross it stretches to about Rs 4.5 lakh.
When does the new regime usually win?
The new regime wins for taxpayers with low or no deductions: freshers, freelancers, business owners without rent-paid receipts, anyone in their own home with no loan, and almost everyone earning below Rs 12 lakh thanks to the higher Section 87A rebate. It also wins universally for incomes below Rs 7.5 lakh because the higher Rs 75,000 standard deduction plus the rebate together produce zero tax.
Can I switch between old and new regime every year?
Salaried individuals without business income can switch between the old and new regime every financial year while filing ITR-1 or ITR-2. Taxpayers with business or professional income can switch only once back to the old regime via Form 10-IEA; once they opt out of the new regime, they cannot re-enter the new regime unless they stop having business income altogether. This means salaried taxpayers should re-run the math every year because their HRA, home loan interest and 80C profile can change.
What are the FY 2025-26 surcharge thresholds?
Surcharge applies above Rs 50 lakh income: 10% (Rs 50L to 1Cr), 15% (Rs 1Cr to 2Cr), 25% (Rs 2Cr to 5Cr) in the new regime. The old regime keeps a 37% surcharge above Rs 5Cr but the new regime caps surcharge at 25%, making it more attractive at very high incomes. Marginal relief applies just above each threshold so that crossing the line never increases the total post-surcharge tax beyond the marginal rate.
Should salaried and business taxpayers decide differently?
Yes. Salaried taxpayers can switch each year, so the decision is annual: just pick whichever regime saves more this year and tell your employer to deduct TDS accordingly via Form 12BB. Business and professional taxpayers should pick carefully because Form 10-IEA (opt-out) can only be filed once if they want to leave the new regime, and re-entry to the old regime is restricted to people who cease having business or professional income.
What about NPS Section 80CCD(1B) and the new regime?
The Rs 50,000 deduction under Section 80CCD(1B) for NPS Tier 1 contributions is only allowed in the old regime. However, the employer NPS contribution under Section 80CCD(2) is allowed in both regimes, up to 14% of basic for central government employees and 14% of basic for other employees in the new regime (raised from 10% in Budget 2024), making employer NPS the only large structural deduction available under the new regime.