Free tax and GST calculators
Calculators we use ourselves, published as they are. No sign-up, no email capture — the numbers update as you type, and nothing you enter leaves your browser.
Old vs new tax regime calculator
Compare both regimes for FY 2026-27 with the standard deduction, the section 156 rebate, surcharge and cess applied, and see which saves you more before you file.
Open calculator→Free toolGST late fee and interest calculator
The per-day late fee on a delayed GSTR-1 or GSTR-3B, capped by your turnover, plus 18 percent interest on tax paid late.
Open calculator→Free toolTrademark class finder
Type what you sell or the service you provide and find the class to file in, across all 45 classes.
Open finder→Free toolHRA exemption calculator
The least-of-three rule under section 10(13A), with the 50% limit for eight metro cities from FY 2026-27.
Open calculator→Free toolCapital gains on property calculator
12.5% without indexation against 20% with indexation, using the cost inflation index up to FY 2026-27.
Open calculator→What is coming next
An ITR form selector already lives inside our which-ITR-form guide. Next on the list are a TDS rate finder, an advance tax instalment calculator and a company incorporation cost estimator by state. The trademark class finder, HRA calculator and property capital gains calculator above are the newest additions. The compliance calendar for FY 2026-27 is published as a guide.
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Frequently asked questions
Are the FilingBase calculators free?
Yes. All the tools are free to use, with no sign-up; the calculations run in your browser.
How accurate are the results?
Each tool applies the rules and rates stated on its page for the current year. Results are estimates; the details of your case can change the answer, so confirm with a CA before you file or pay.
Which calculators are available?
An old vs new tax regime calculator, a GST late fee and interest calculator, an HRA exemption calculator, a capital gains tax calculator for property, and a trademark class finder. A gratuity calculator sits in our gratuity guide.