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Free toolsFree tax tools & calculators
Ten free tools for taxpayers and businesses – updated for the Income-tax Act, 2025 and GST rates after September 2025. No sign-up, nothing stored.
Income tax calculator – new vs old regime
Estimate tax on salary and other slab-rate income for Tax Year 2026-27 and FY 2025-26, with rebate, marginal relief, surcharge and cess.
Open tool →HRA exemption calculator
Exempt and taxable HRA under the old regime, with the 2026 metro-city list.
Open tool →GST calculator
Add or remove GST at 5%, 18% or 40%, with CGST/SGST or IGST split.
Open tool →GST late fee & interest calculator
Late fee with turnover-wise caps and 18% interest for late GSTR-3B / GSTR-1.
Open tool →TDS rate finder (2025 Act)
Old section, Section 393 entry, threshold and rate for common payments.
Open tool →Advance tax instalment planner
Instalment-wise advance tax amounts and due dates for Tax Year 2026-27.
Open tool →Tax audit applicability checker
Answer a few questions to see whether a tax audit is likely to apply.
Open tool →ITR form selector
Find the likely ITR form for FY 2025-26 based on your income sources.
Open tool →Tax Notice Navigator
What your income-tax or GST notice means, time limits and documents to keep ready.
Open tool →Tax & GST due-date calendar
Monthly, quarterly and annual due dates with calendar (.ics) download.
Open tool →Tools are for general guidance and are reviewed periodically (last reviewed 10 November 2026). Use the Law Library to look up the underlying sections.
Have a tax, GST or business question?
Call, WhatsApp or email CA Dilbagh Singh and team, from Delhi, anywhere in India or abroad.