Methodology

RealBill calculators are planning tools for Indian salaried professionals and small businesses. Each tool states its formula on the page and links here for sources and review cadence.

Income tax & salary

Income tax estimates follow notified slab rates and Section 87A rebate logic for the new regime, with optional old-regime comparison. Standard deduction for salaried income is applied per current rules. Sources: Income Tax Act, 1961; Union Budget notifications on incometax.gov.in.

HRA, gratuity, EPF

HRA exemption uses Section 10(13A) minimum-of-three method. Gratuity follows Payment of Gratuity Act, 1972 (15/26 formula). EPF uses standard employee/employer contribution rates unless you override inputs.

Savings & loans

SIP, FD, PPF, RD, and NPS tools use compound-interest or annuity formulas with user-entered rates. EMI uses reducing-balance amortisation. Published PPF/FD rates are indicative — verify with bank/NSC before investing.

GST & invoices

GST calculator splits CGST/SGST/IGST by supply type. Invoice tool formats fields commonly required on Indian tax invoices; it does not file returns on your behalf.

Updates

When Finance Act or RBI/NSC rates change, we update calculator defaults and note the review date on each page. Report errors via contact.