For ST-556: Enter the selling price, including accessories, federal
excise taxes, freight and labor, dealer preparation, documentary
fees, and any rebates or incentives for which you as a dealer
receive reimbursement. Do not subtract the value of any rebate
made directly to the customer. In general, any cost passed on to
the customer as part of the sale of an item and for which gross
receipts are received should be included in the selling price.
Please feel free to post any additional details or questions in the comment section.
https://ttlc.intuit.com/replies/5952570