GST filing
A registration is per state and every rule has a date; GSTR-1 and GSTR-3B are prepared from the books in the portal's shape; the purchase credit is only what the supplier declared.
GSTR-1 had been a report since the first reports pack: rows by party, useful to read, not something the portal can take. GSTR-3B had never existed; the accountant built it from three exports and a calculator every month, and when the numbers moved after the filing nobody could say what changed.
A registration is per state
The hotel's GST identity is not one column. A return is filed per GSTIN — one registration for every state the entity trades in, with its kind, its effective dates and its e-invoice threshold — and two hotels of one company in one state file one GSTR-1 between them.
The return is prepared from the books
Outward supplies by rate and by party, the credit and debit notes, the advances received and adjusted, the HSN summary — in the portal's tables, from the postings, with a control check that the return agrees with the ledger to the rupee. A change to the books after preparation is a difference the screen names.
The credit is what the supplier declared
Input credit is what the supplier filed, not what the hotel's bills say. GSTR-2B is read in; each line is accepted, rejected or kept pending; a bill with no line in 2B is credit not taken this month; a line in 2B with no bill is a purchase nobody recorded.
TDS returns
Form 26Q prepared each quarter for what was deducted; Form 26AS matched for what was deducted from the hotel.