Assuming $100, a warranty deposit of $10, and 17% tax, i.e.
1. Sales of $100
Borrow: Accounts Receivable-** 100
Credit: Revenue from Main Business 85.47
Taxes Payable - VAT Payable (Output Taxes) 14.53
2. Receive $90 and keep $10 Warranty deposit
Debit: Bank Deposit 90
Credit: Accounts Receivable-** 90
Just so you can see it