Hello Dhruvika,
Accounting treatment differs depending on when the possession (Possession, not ownership) is transferred to the buyer.
If the client is allowed to use the land from the first installment, it is recommended to treat it as Hire-sale and book sales right away :
Hire-purchaser/Debtor A/c Dr.
To Hire-Sale A/c
and then on each installment :
Cash/Bank A/c Dr
To Hire Purchaser A/c
But if the plot is handed over after payment of the last installment, then you should treat the installments as advance received, and book sale after the payment of the last installment.
Note : the completion of dastavej has no significance in accounting. It gains its importance only when it comes to taxation.
Hope this was of help.
Ansari Salman