BizGST Pro
The field nobody checks twice
It gets typed the way reference numbers get typed — quickly, once, and rarely looked at again. But it is the field your billing software reads before deciding what tax to put on the bill.
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Where the instruction lives
Every GSTIN opens with a two-digit state code. Yours says where you supply from. Your customer's says where you supply to. That pair is what the software actually uses.
What the pair decides
Within one state the tax splits into two halves. Across states it does not split. Software that knows both GSTINs never has to ask you which — and should not, because asking hands you a decision you can get wrong.
Why a typo survives
A slip in the middle of one reads fine. Nothing complains at entry. The right total lands under the wrong heads, and it stays that way until a return disagrees with you.
The quiet case
A customer saved without one is treated as unregistered, and that changes how the supply is classified. Leaving the field blank is a choice, not a blank.
Two habits
Then let the software fill the state from it instead of picking the state yourself. If the state that appears is the one you expected, the number is at least internally consistent. If it surprises you, you have caught it at entry.
In BizGST Pro
State fills itself from the GSTIN on your business and on each customer, and the CGST/SGST/IGST breakup follows from that pair. What this story does not give you is any rate or threshold — those change by notification, and the GST portal or your CA is where today's figure comes from.
BizGST Pro
GST invoicing, customer ledgers, stock and reports — built for Indian businesses.
bizgstpro.com