How onsite structure works in TCS? If they send you for 2-3 years, then you get payment in India and that country both? Pls explain.

For long term, basically onsite salary+converted indian salary = total salary which you will get at an onsite country in their currency.

For short terms - TCS salary+daily allowance For long terms - Onsite compensation letter

Exact specifics of short and long are geo dependent so check in with your project or onsite managers.