How to know if a buyer can afford to purchase your property

If a buyer is submitting an offer on your home, you want to know if they can afford it right?
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Here is what the buyer will turn in to you when they submit an offer:
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-their purchase contract
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-their pre approval letter from their lender
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-their bank statement, AKA, their proof of funds
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The last 2 will show you if they can get a loan and if they have the cash for the down payment.