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An intra-state supply attracts CGST, which goes to the centre, and SGST, which goes to the state. An inter-state supply attracts IGST instead, at the combined rate, which the centre later apportions.
The total tax is broadly the same either way. What differs is which authority receives it, which is why the determination matters.
Whether a supply is inter-state or intra-state turns on the place of supply, which is defined in law and is not always the customer's billing address.
For services in particular the rules are specific and vary by service type. This is the part worth taking advice on, because the intuitive answer is often wrong.
Broadly yes. The difference is which authority receives it, and that is what makes errors awkward.
Not necessarily, particularly for services. The rules are specific — take advice.
Through credit or debit notes and amended returns, usually with a cash-flow effect.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.