Every year the same question arrives in March, and it is usually answered with a rule of thumb someone heard at work. The honest answer is that there is no income level at which one regime always wins. There is only a break-even level of deductions, and it moves with your salary.
What actually separates the two
The new regime is the default. It offers wider slabs and lower rates, and in exchange it takes away most deductions and exemptions. The old regime keeps the deductions but taxes at higher rates on narrower slabs. That is the whole trade.
| Old regime | New regime | |
|---|---|---|
| Slab rates | Higher, narrower slabs | Lower, wider slabs |
| Standard deduction on salary | Available | Available |
| Section 80C investments | Available | Not available |
| 80D health insurance | Available | Not available |
| HRA exemption | Available | Not available |
| Interest on a self-occupied home loan | Available | Not available |
| NPS employer contribution (80CCD(2)) | Available | Available |
| Default if you do nothing | No | Yes |
The only calculation that matters
Work out your total deductions under the old regime — not the ones you could theoretically claim, the ones you will actually have proof for. Then compute tax both ways on your real numbers. The regime with the lower figure wins. There is no shortcut that survives contact with a real salary structure.
Who tends to land where
As a starting point only, and subject to the calculation above:
- You pay significant rent in a metro, have a home loan, and max out 80C — the old regime often still wins.
- You are early in your career, renting cheaply or living at home, with little invested — the new regime usually wins comfortably.
- Your salary is heavily structured with allowances and reimbursements — model it properly, the answer is not obvious.
- You have no home loan and invest mainly in equity mutual funds outside 80C — the new regime usually wins.
Switching between them
A salaried person without business income can generally choose afresh each year at the time of filing, whatever they told their employer for TDS purposes. What you declared to payroll in April affects how much tax was deducted, not which regime you are finally taxed under. Someone with business or professional income has far less flexibility — the switch is restricted and, once exercised in a particular direction, may not be available again.
Do not optimise the wrong thing
The regime choice is worth a fixed amount each year. Where the real money usually sits is elsewhere: salary structuring done before the year starts rather than after it ends, timing capital gains across financial years, using the employer NPS contribution which survives in both regimes, and simply claiming everything you are entitled to instead of the three deductions you remember.
That work has to happen during the year. By the time you are filing in July, most of it is already fixed.