OP, assuming you are working with a lawyer on this land purchase, you should ask him or her for an analysis of the potential consequences of breaching any sale contract that you may have signed. This is a very fact-specific question and the answer will depend on the precise terms of any documents you have signed, as well as all of the other relevant facts. There is no general answer to the question of what the consequences will be. However, I will nonetheless post in this thread because I want to clear up a misunderstanding that seems to be present in the earlier replies.
Under Washington state law, if a buyer fails to perform under a contract for the purchase of land,
the seller's remedy is not limited to retention of the earnest deposit unless the contract says so or the seller otherwise waived other remedies. "In general, a vendor or purchaser may obtain specific performance of a contract for the sale of realty."
Streater v. White,
26 WnApp 430, 433 (WA Ct App 1980). This means that, in general, the Court can order the buyer to close on the sale and purchase the property. However, this is an equitable remedy and it is subject to various defences such as waiver, estoppel, unclean hands, etc. See, e.g.,
Sheldon v. Hallis, 72 Wn.2d 993, 996 (WA Sup Ct 1967) ("An action for specific performance is a proceeding in equity."). That is one reason why this is a very fact specific question and OP should ask his or her lawyer for advice.