Tax
Most tax questions come down to three things: which regime fits your deductions, what you can actually claim, and what a one-off payment does to your bill. These tools answer each with your numbers rather than a rule of thumb.
The new regime has lower rates and almost no deductions; the old regime has higher rates and lets you claim HRA, home-loan interest, 80C and 80D. Which wins depends entirely on how much you actually claim, so the only useful answer runs both on your figures.
HRA exemption is the lowest of three tests, and it is available under the old regime only. For someone paying substantial metro rent it is often the single deduction that decides which regime is cheaper.
A bonus, a leave encashment payout or any other lump sum is added to your income for the year and taxed at the slabs it reaches. The useful figure is not the amount but the extra tax it causes, which is what these compute.
Your monthly deduction is your annual liability spread across the year, adjusted for the declarations you gave your employer. If your declarations changed, or you started mid-year, the monthly figure and the annual one will not line up.
Salaried taxpayers without business income can generally choose each year when filing, regardless of what they declared to their employer. Your employer's TDS follows your declaration, so a mismatch is settled as a refund or a shortfall when you file rather than locking you in.
These calculators use a simplified model — they exclude surcharge, special-rate income such as capital gains, and several less common deductions. They are built to show how the arithmetic works and roughly where you stand, not to reproduce a filing.
No. A bonus is salary and is taxed at your slabs. What makes it feel higher is that it often lands entirely in your top slab, and that employers frequently deduct TDS on it at a flat rate that is later reconciled at filing.
No. These are educational calculators that show a formula working on figures you supply. Tax rules change and individual situations vary, so confirm anything that matters with a qualified professional or the Income Tax Department before acting on it.