In such a scenario, one may adjust their Output VAT on account of bad debts. But all of the following conditions must be fulfilled: a. Goods/services must have been supplied and VAT was charged on it and paid to the Authority ; b. The unpaid portion should be written off in the books of accounts as bad debts ; c. More than 6 months have passed from date of supply ; d. Supplier should notify the customer that unpaid amount has been written off (one can issue Tax credit note to the customer to notify this). If all of the above conditions are satisfied in your case, the output VAT for the unpaid portion can be reversed in the VAT return using the "Adjustment" field of the return.

Ok but it's still less than six months. So we should wait then.

Since it is one of the conditions to be satisfied you would have to wait