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NRI has to open non repatriable non resident demat , bank and trading account. Resident demat holding gets transferred to the new non resident demat account on filling a transfer cum account closure form. Resident account gets closed after that.
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Bank account remains the same but resident status changes to non resident.
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Additionally PIS account has to be opened. All share purchase and sales are routed through PIS account. One can have as many PIS account as one needs but with only one bank. Each demat account has to be linked to separate PIS account.
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ICICI , HDFC and I believe other major banks provide these services. If you are applying from abroad, all your documents need to be attested by embassy or bank. Need to check with them which is the authority they accept.
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Very tedious and generally takes a long time. Need to fill in Annexure II or III for informing about the details of purchase. This annexure is very important as the date you mention here is considered as the actual date of acquisition irrespective of the real purchase date as in the resident demat status.
6, Capital Gains tax is deducted while paying in for each settlement.
Starting is a big headache but should get streamlined with time. Brokerage is also higher compared to resident accounts.