Compare estimated tax under the old regime (with deductions) vs. the new simplified regime.
New regime: lower slab rates but no deductions. Old regime: standard slabs, but your taxable income is first reduced by your total deductions (80C, HRA, standard deduction, etc.) before tax is computed. Whichever gives a lower tax is generally better for you.
Illustrative estimate only — tax rules change frequently and vary by jurisdiction/circumstance. Verify with an accountant or official source before relying on this.