A good tax calculator answers the question everyone has in April and July: how much will I actually pay this year? Two minutes with the right inputs beats an hour of slab math on paper.
The inputs that matter
- ✓Gross annual salary (your CTC minus employer PF and gratuity parts)
- ✓Other income: bank interest, FD interest, dividends, rent
- ✓Deductions you can claim in the old regime: 80C, 80D, HRA, home loan interest
- ✓TDS already deducted, to see your refund or balance payable
The mistakes that skew estimates
Using CTC instead of taxable salary inflates your tax. Forgetting interest income deflates it, and the department will notice. And comparing regimes without entering deductions makes the old regime look worse than it is. Garbage in, garbage out.
One number is not the goal
The real value of a calculator is comparison: both regimes side by side, so you see whether your 80C investments and HRA actually beat the new regime's lower rates. For most people earning under Rs 13 lakh the new regime now wins outright, but your mix of deductions can change the answer.
The Saathi.Tax calculator is free, needs no login, and shows both regimes with a slab by slab breakup. When you are ready, the same numbers flow straight into your actual return.
