The basic trade-off
The new regime offers lower slab rates but strips out most exemptions and deductions. The old regime has higher rates but lets you claim the full range — 80C, 80D, HRA, home loan interest and the rest.
Since the new regime became the default, taxpayers who do nothing are taxed under it. That is fine for many people and expensive for others, which is why it is worth actually computing rather than assuming.
What the new regime removes
The following are not available under the new regime. If you claim a substantial amount across these, the old regime may well leave you better off:
- Section 80C — PPF, ELSS, life insurance premium, principal on home loan, children's tuition
- Section 80D — health insurance premium
- House Rent Allowance exemption
- Leave Travel Allowance
- Interest on a self-occupied home loan under section 24(b)
- Most other Chapter VI-A deductions
Who tends to gain from which
These are tendencies, not rules — the only reliable method is to compute both.
| Situation | Usually better |
|---|---|
| Few or no investments, no home loan, no HRA claim | New regime |
| Substantial 80C, plus HRA and home loan interest | Old regime |
| Young earner early in their career, renting modestly | New regime |
| Home loan with high interest in the early years | Old regime |
| Senior citizen with significant medical insurance | Usually old regime |
The switching rules
Salaried taxpayers without business income can choose afresh every year. You can be under the new regime one year and the old the next, based on whichever suits your circumstances that year.
Taxpayers with business or professional income face a stricter position. Having opted out of the new regime, the ability to switch back is restricted — broadly, the choice can be exercised only once. Get advice before opting out if you have business income, because the decision is not easily reversed.
Do not decide on a rule of thumb
We routinely see differences of tens of thousands of rupees between the two regimes for the same person — in both directions. The rule-of-thumb answers circulating online are frequently wrong for any specific individual, because they ignore the interaction between HRA, home loan interest and 80C.
Run both computations on your actual figures. It takes minutes with the right inputs, and it is the single highest-return thing you can do at filing time.
This guide is general information, not advice for your specific situation. Statutory thresholds, fees and due dates change by notification — we confirm the current position for your case before you commit to anything.