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You usually need a minimum of 100 active accounts to report to the credit bureaus, and it costs money, something that a single individual would find incredibly costly. However http://www.rentreporters.com/ reports rent, so they just may be interested in reporting owner financing payments. Last I heard (months ago) they weren't, but they may have changed their policy... or if enough people ask them about it maybe they'll start doing it. It's worth a phone call/email.