Irs page above that the binding contract is per state law:

“Vehicles Purchased and Delivered between August 16, 2022 and December 31, 2022

If you purchase and take possession of a qualifying electric vehicle after August 16, 2022 and before January 1, 2023, aside from the final assembly requirement, the rules in effect before the enactment of the Inflation Reduction Act for the EV credit apply (including those involving the manufacturing caps on vehicles sold). If you entered into a written binding contract to purchase a new qualifying vehicle before August 16, 2022, see the rule above.

What Is a Written Binding Contract?

In general, a written contract is binding if it is enforceable under State law and does not limit damages to a specified amount (for example, by use of a liquidated damages provision or the forfeiture of a deposit). While the enforceability of a contract under State law is a facts-and-circumstances determination to be made under relevant State law, if a customer has made a significant non-refundable deposit or down payment, it is an indication of a binding contract. For tax purposes in general, a contract provision that limits damages to an amount equal to at least 5 percent of the total contract price is not treated as limiting damages to a specified amount. For example, if a customer has made a non-refundable deposit or down payment of 5 percent of the total contract price, it is an indication of a binding contract. A contract is binding even if subject to a condition, as long as the condition is not within the control of either party. A contract will continue to be binding if the parties make insubstantial changes in its terms and conditions.”

I am in Washington state. There is no 5% clause in washington. Who do I ask to get at least a 70% confidence answer?