Misrepresenting or concealing important facts that constitute breach of contract is fraud.

In the example above, part of signing the contract is agreeing that your usage of the vehicles doesn’t involve reselling them. Signing that contract with intent to re-rent them is a very clear legal problem.

There are several other layers of problems. When you rent something to someone else, you are representing that you have legal standing to rent it out.

If you rent out someone else’s property after agreeing to a contract that says you cannot rent it out, you are doing some more serious misrepresenting of the key facts and your intent. It could also trigger laws about theft of services depending on the situation.

Not every breach of contract is fraud, but signing a contract when you never intended to fulfill your side of the bargain is. For example, if someone signs a contract with a seller, pays them, and the seller disappears, they were defrauded. Or agreeing not to resell something and then doing it anyway.