Contingency clauses are often included in contracts for home and land purchases. They typically protect the buyer from fraud and other risks.An acceleration clause in a mortgage or trust deed stipulates that the entire debt is due immediately, if the borrower defaults under the terms of the contract. In the purchase agreement, there should be a clause that allows the wholesaler to immediately file a claim of interest against the property. Represent good guidelines to be considered when engaging in the use of subordination clauses and agreements. See Civil Code Section 2953.1 et seq. Acceleration Clause. Some important contingency clauses should include financing, home inspections, closing costs, and the closing date, among others. But before the sale can be finalized, some contingencies or conditions must be met. These contingencies are clauses in the sales contract.