Your home buyer can back out from purchasing your property by utilizing their loan contingency.
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What that means is that if the buyer cannot get a loan, they can back out and still get their deposit back.
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However, this has to be done during the loan contingency period. Loan contingencies are usually 21 days long and start when you have an executed purchase contract.
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If the buyer releases their loan contingency on day 21, they can no longer back out of the deal because of their loan contingency.