The tax split is decided, not typed

How does Biztricks calculate GST?

It computes tax on the taxable value at the line's rate, rounds that once, and then splits it. On an intra-state supply CGST is half, rounded, and SGST is the remainder — so the two halves always add up to the tax exactly, to the paisa.

That last detail is the whole reason to trust the arithmetic. Round each half independently and CGST + SGST can drift one paisa away from the tax you printed above them, on an invoice that a tax officer may read line by line. Deriving SGST as the remainder makes the halves sum exactly by construction, every time, without a correction step.

What prints on the invoice?

Everything an Indian tax invoice is expected to carry, and nothing that does not belong on it.

Where does the invoice come from?

From the quote the customer accepted — one action, and every line, dimension, rate and group comes across.

You can also bill several accepted quotes onto one invoice when a job ran in stages, or raise a quick bill from scratch when there was no quote at all. Part payments are recorded against the invoice as they arrive, and what is still outstanding feeds straight into reports.

An invoice that should never have existed can be cancelled. Its number is not reused, because a gap in the register is a smaller problem than a number that means two different things.

What about HSN codes?

Biztricks will suggest an HSN or SAC code for an item, and will never apply one without you tapping it.

The format is validated, so a code that cannot be right is caught before it prints. But a suggestion is a suggestion: the classification of what you sell is a decision with tax consequences, and the app says so and tells you to confirm it with your own CA. Every seeded item in your trade's starter list already carries a code as a starting point.