Free tools
All six run entirely in your browser. Nothing you type is sent to a server, there is no signup, and none of them will ask for your email before showing you the answer.
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GST invoice generator
Build a Rule 46 compliant tax invoice and print it or save it as a PDF. Works out the CGST/SGST or IGST split from the place of supply.
Anyone who needs one invoice right now
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GST calculator
Add GST to a price or extract the GST already inside a total, with the tax split shown either way.
Quoting, checking a supplier bill
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GSTIN validator
Check a GST number’s pattern, state code and checksum. Catches typos before they reach an invoice.
Adding a new customer or supplier
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Late payment interest calculator
Work out the statutory interest owed under section 16 of the MSMED Act, compounded monthly from the 45-day appointed day.
Registered micro and small enterprises chasing payment
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Invoice number generator
Design a numbering series and check it against the sixteen-character limit and permitted characters.
Setting up at the start of a financial year
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Payment reminder writer
Draft a reminder at one of three escalation levels, from a gentle nudge to a formal notice citing the statutory position.
The invoice that has gone quiet