New Tax Regime vs Old Regime (Quantitative Breakeven)
The quantitative breakeven analysis between India's new tax regime (lower slab rates, no deductions) and the old tax regime (higher slab rates, multiple deductions) identifies the total deduction threshold at which an individual's tax liability is identical under both regimes — with deductions below the breakeven favouring the new regime and deductions above it favouring the old regime.
The Finance Act 2020 introduced the new tax regime under Section 115BAC as an option for individual taxpayers, subsequently made the default regime from FY2023-24 by the Finance Act 2023. The new regime offers reduced slab rates — zero up to Rs 3 lakh, 5% from Rs 3-7 lakh, 10% from Rs 7-10 lakh, 15% from Rs 10-12 lakh, 20% from Rs 12-15 lakh, and 30% above Rs 15 lakh — but eliminates most deductions including Section 80C (up to Rs 1.5 lakh), 80D (health insurance), HRA, LTA, standard deduction (restored at Rs 75,000 from FY2024-25), and home loan interest under Section 24(b).
The breakeven deduction calculation requires equating the tax liability under both regimes for a given gross income. For a salaried individual earning Rs 12 lakh gross income, the new regime tax (with Rs 75,000 standard deduction = Rs 11.25 lakh taxable) is Rs 56,250 (after 87A rebate considerations at sub-Rs 7 lakh and standard computation above). The old regime tax depends on deductions claimed. If the individual claims Rs 1.5 lakh under 80C, Rs 50,000 under 80D, Rs 1.2 lakh HRA, and Rs 75,000 standard deduction — total Rs 3.95 lakh — the old regime taxable income drops to Rs 8.05 lakh, generating a lower tax liability than the new regime computation at that income level.
At higher income levels, the breakeven deduction quantum rises. For gross income of Rs 20 lakh, a typical salaried taxpayer needs deductions of approximately Rs 3.75-4.5 lakh to make the old regime competitive. For gross income of Rs 50 lakh, the differential between new and old regime rates narrows (both eventually face 30%), but old regime benefits from surcharge thresholds and the marginal relief provisions may continue to favour the old regime for very high deduction claimants. The precise breakeven varies year on year as Finance Acts modify slab rates, and must be recomputed for each individual using actual deduction eligibility.
The new regime is structurally advantageous for young earners with limited deduction opportunities — those without home loans, with modest insurance premiums, and early in their 80C accumulation cycle. The old regime retains advantage for taxpayers with existing large home loan principal and interest deductions, employer NPS contributions under Section 80CCD(2) — which is available under both regimes and should be fully utilised regardless of regime choice — and structured professional expenses.
A critical process note: the choice between regimes must be exercised at the time of ITR filing for self-employed and business income taxpayers (Form ITR-3 or ITR-4) and can be changed annually. Salaried employees must inform their employer of the chosen regime at the start of the financial year for TDS computation purposes; the employer deducts TDS based on the declared regime, but the final choice is confirmed at ITR filing. Failure to inform the employer defaults TDS to the new regime from FY2023-24 onwards.