Whenever you buy a stock, your broker blocks a certain amount of margin.
If you take delivery and then don't pay on time for the delivered shares, two things can happen.
1. The broker will finance the position. He will pay the stock exchange on T+2 day.
He will then charge you interest for the net amount that he paid for you.
2. In case your broker does not provide margin finance, he will just sell your shares and recover the money. You will have to bear any consequent loss. The broker will adjust the loss against the margin that he blocked. If the margin blocked is less than the loss, the broker will ask you to pay the remaining amount.
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