Do I need to submit a written contract with my SparkOffer?
A: This will depend on the individual seller or listing agent, though it is most common to simply attach your proof of funds (POF) to your SparkOffer.

What is an acceptable proof of funds (POF)?
If the offer is cash, the common forms are a letter from the bank or financial institution, a screenshot of a bank balance showing the owner of the account and bank name or a copy of the first page of a bank statement. If financing, POF is typically a mortgage pre-qualification letter or a letter from your alternative funding source.
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Your goal here is to give the seller and/or listing agent comfort that you can perform on the purchase of their property.