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640 is needed for USDA without doing a manual underwrite which you DO NOT want to do since you already have a 631. Feel free to email me what your credit is like, and I am sure i can tell you how to get above 640. Your wife's income will count as far as meeting the income limits, but will not help with calculating dti. At 35% you are good to go though. Income limits vary a ton based on where you are located, but they are all listed on USDA's website if you click eligibility. Let me know if you need help and good luck!