Every year around filing season I am asked the same question. Should I go with the old tax regime or the new one? There is no universal winner. The right choice depends almost entirely on how many deductions you actually claim.
The basic trade-off
The old regime has higher slab rates but lets you reduce taxable income through deductions and exemptions, such as investments under Section 80C, house rent allowance, and home loan interest. The new regime under Section 115BAC offers lower slab rates but takes most of those deductions away. It is now the default, so you have to consciously opt for the old regime if you want it.
A simple way to test it
Add up the deductions and exemptions you genuinely use in a year. If that total is large, the old regime often wins. If you claim very little, the lower rates of the new regime usually leave more in your pocket. The break-even point shifts with each Budget, so the comparison is worth redoing every year.
One caution
Salaried taxpayers can generally choose afresh each year, but those with business income face limits on switching back and forth. Plan the decision rather than making it at the last minute. This is general information and not advice on your particular return.