I hope he doesn't need that $15,000 for a Down Payment.
I'd bring every CC up to date, and then consider paying off the highest Interest Rate Cards. But I'm not a Credit Rating Strategist . . . . and they can give you the optimum formula for improving his credit score.
If he weren't buying a house, I'd say pay everything off and stop giving $2500 to $3000 away every year (coming from someone who has only paid 66¢ in interest during the past 15 years).
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Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"