Free GST tools
GST Calculators
Add or remove GST at the current rates, and see what a late return will cost in late fees and interest.
Result
- Taxable value
- GST
Total
Since 22 September 2025 most goods are at 5% or 18%; the 12% and 28% slabs were removed. Some items have special rates — check your HSN code.
What the delay costs
- Days late
- Late fee
- Interest at 18% a year
Total
Estimate only. Interest applies to tax paid in cash after the due date; wrongly claimed and used credit attracts 24%. Amnesty schemes, when announced, can change the late fee.
Never pay a late fee again — start GST filingMore calculators — income tax, TDS, loans and more — on our calculators page and in Resources.