Calculators & Money guides
EMI, GST, tax and everyday calculations with worked examples.
GST REG-14 Non-Core Amendment: OTP in 3 Days or No ARNAfter filing a GST REG-14 non-core amendment, finish OTP verification within 3 days or no ARN is generated. Where to verify and what needs officer approval.Is Income up to Rs 12.75 Lakh Tax Free? How the Rebate WorksFor a salaried person, Rs 75,000 standard deduction plus a Rs 12 lakh rebate limit adds up to about Rs 12.75 lakh in salary with nil tax. Here is the maths.New Tax Regime Slabs FY 2026-27 With ExamplesNew tax regime slabs for FY 2026-27 (unchanged): nil up to Rs 4 lakh, then 5% to 30%. A rebate zeroes tax up to Rs 12 lakh. Worked salary examples.GST Rate Slabs in 2026: 0%, 5%, 18% and 40% ExplainedSince GST 2.0 on 22 Sept 2025, India's GST slabs are 0%, 5%, 18% and 40%. Here is what changed, why, and a calculator example for each rate.How to Calculate GST: Formula for Adding GST to a PriceGST amount = base price x rate / 100. Add it to the base price for the inclusive price, then split into CGST + SGST or IGST. Worked example at 18%.How to Calculate GST From an Inclusive Price (Reverse GST)To find GST hidden in a price, divide by (1 + rate/100) to get the base price, then subtract. Worked examples at the current 5%, 18% and 40% GST slabs.GST registration from a home address: what proof CBIC acceptsGST registration from home: CBIC Instruction 03/2025-GST sets which address proof is enough for owned, rented and family flats, and what officers can't ask.CAGR Formula: How to Calculate Growth RateCAGR is [(End Value / Start Value)^(1/years)] - 1. See it worked through an example, and how it differs from absolute return and XIRR for uneven cash flows.Income Tax Audit Last Date AY 2026-27: 21 Oct PassedCBDT moved the AY 2026-27 tax audit report date to 21 October 2026 and the return to 21 November. How to check if your CA uploaded it.Coupon vs Percentage Off: Which Is Applied First?Rs 500 coupon and 15% off on a Rs 5,000 cart: Rs 3,750 or Rs 3,825? See why the order changes the price, with a worked example.Compound Interest Formula With ExamplesThe compound interest formula is A = P(1 + r/n)^(nt). See it worked through for a student savings example and a monthly-compounding investment example.PPF Interest Calculation: The 5th-of-Month Rule ExplainedPPF interest is paid on the lowest balance between the 5th and the last day of each month. Deposit after the 5th and you lose that month's interest entirely.