Guides for owners.

GSTINGST Identification Number

Your 15-character GST number. The first two digits are your state code, and the next ten are your PAN.

HSNHarmonised System of Nomenclature

The code for what you sell. It goes on each line of a GST invoice and points to the rate.

IRNInvoice Reference Number

The number the government's e-invoice portal gives a B2B invoice, with a QR code. Needed once turnover is above ₹5 crore.

E-way billElectronic way bill

A permit to move goods, made on the e-way bill portal. Needed above ₹50,000 a consignment; some states set a different limit inside the state.

GSTR-1Return of outward supplies

Your sales return: every invoice you issued in the month or quarter.

GSTR-3BSummary return

The summary return where you pay the GST you owe, after credit for the GST you paid.

GSTR-2BAuto-drafted input statement

The GST your suppliers reported against you. It shows how much input credit you can take.

IMSInvoice Management System

On the GST portal: where you accept, reject or keep pending each supplier invoice before it reaches GSTR-2B.

ITCInput Tax Credit

GST you paid on purchases, taken off the GST you owe on sales. Only for bills that show in your GSTR-2B.

TDSTax Deducted at Source

Income tax you cut from a payment, like a salary or a contractor's bill, and deposit with the government.

PFProvident Fund (EPF)

A retirement saving: 12% of wages from the employee and 12% from you, paid to EPFO every month.

ESIEmployees' State Insurance

Health cover for staff earning up to ₹21,000 a month: 0.75% from the employee and 3.25% from you.

PTProfessional Tax

A small tax on salaries, set by each state. Some states, like Delhi, don't charge it.

Last checked: October 2026. Rules change: confirm with your CA.