Trades, generally a. A trade-in allowance is excluded from the purchase price only if the requirements of Iowa Code section 321.105A(2)“a”(2)(c) are met. EXAMPLE A: Person D has an automobile with a value of $5,000. Person E also has an automobile valued at $5,000. They decide to trade automobiles. Person D and Person E make an even trade, automobile for automobile, with no money changing hands. The fee for new registration is not due on either automobile because the exchange is even in value. EXAMPLE B: Person B has an automobile with a value of $2,000. Person C has an automobile valued at $3,500. Person B and Person C decide to trade automobiles. Person B pays Person C $1,500 in cash for the difference in value. Person B will pay the fee for new registration on $1,500. Person C will not pay the fee for new registration because the trade-in allowance reduces the purchase price to $0.