New Tax Regime vs Old: Which One Should You Choose?

An in-depth comparison of both tax regimes with practical scenarios to help you make the right choice for AY 2026-27.

The choice between the old and the new personal income-tax regime is now an annual decision for most salaried taxpayers — and it should be made with actual numbers, not assumptions.

This note explains how the two regimes differ, when each one tends to be better, and the practical signal to use when running the comparison for yourself.

The structural difference

The **old regime** offers higher slab rates but allows the full set of deductions and exemptions — Section 80C investments, 80D health insurance, HRA, home-loan interest under Section 24, NPS contributions under 80CCD(1B), and a long list of other items.

The **new regime** offers lower slab rates and is now the default for salaried taxpayers, but most deductions and exemptions are not available. The standard deduction for salaried employees and certain employer contributions to NPS continue.

The Budget over the last few years has progressively widened the new regime's appeal — increased standard deduction, more favourable slabs, and a rebate that makes income up to a defined threshold effectively tax-free. The clear policy direction is to consolidate around the new regime.

When the old regime still wins

The old regime is typically better when total deductions and exemptions exceed approximately Rs. 3-4 lakh per year (the exact break-even depends on the slab the taxpayer falls into). Typical candidates:

• Home-loan EMI in the principal-and-interest-heavy years of a long tenure
• Full Section 80C utilisation through PF, ELSS, life insurance premium, children's tuition fees, principal repayment
• Significant HRA claim driven by metro-city rent
• 80D for self + parents + critical-illness rider
• 80CCD(1B) additional NPS investment
• Other deductions like 80E (education loan interest), 80G (donations), 80EEB (electric-vehicle loan interest)

When the new regime is the obvious choice

• Young professionals early in their career without significant deductions
• Salaried employees who don't pay rent (own house, employer-provided accommodation)
• Anyone whose investments are largely in non-80C-eligible instruments (direct equity, mutual funds, REITs)
• Pensioners receiving family pension or interest income with few deductible expenses
• Anyone who values simplicity and doesn't want to track receipts for the year

How to actually run the comparison

The cleanest approach is to model both regimes for the financial year using projected income and known deductions. The Income Tax Department's official calculator on incometax.gov.in works for a quick check, but for clients with multiple income heads or business income the better approach is a spreadsheet with both columns side by side.

Key inputs:

• Gross salary (and any other income — interest, dividends, rental, capital gains, business income)
• Standard deduction Rs. 75,000 (salaried) under the new regime; Rs. 50,000 under the old
• Section 80C — actual investment, not the cap
• HRA — actual exemption based on the formula, not the rent paid
• Home-loan interest — actual paid, capped at Rs. 2 lakh (or Rs. 1.5 lakh under 80EEA in the qualifying period)
• 80D, 80CCD(1B), and other applicable deductions

The output is the tax payable under each regime. The difference, plus the convenience of the new regime, drives the choice.

A common pitfall: locking in the wrong choice through TDS

Salaried employees declare their regime preference to the employer at the start of the year, which determines TDS for the year. Switching at filing time is possible for salaried taxpayers but creates a refund-or-additional-tax situation that's avoidable with the right declaration upfront.

For taxpayers with business or professional income (other than salary), the choice is more restrictive — opting out of the new regime once means a multi-year lock-in under Section 115BAC(6), so the decision warrants more careful modelling.

What we recommend

• **Run the comparison annually, before April.** The result can change year to year as deductions or income mix change.
• **Save the working.** If the AO ever asks why a particular regime was chosen, having the comparison sheet on file is useful.
• **Don't anchor on last year's choice.** A change in home-loan principal, a maturing LIC policy, or a job change can move the break-even meaningfully.

We run this comparison as part of the standard year-end review for our retainer clients. For one-off assistance with a regime decision for the current financial year, please get in touch through the contact page.