I wouldn't ever figure you could refinance "later on", that is a plan waiting to go wrong. Lenders guidelines are getting tighter & tighter, so if you think it's hard to qualify for a loan today - wait 6 months and see how hard it will be then. The loan that you purchase your home with should be the loan that you would be comfortable being in for quite some time. If it's not, then wait until your situation improves to where you can qualify for a loan that you would be comfortable to be in for awhile. There is no magic score that determines if one can get approved through automated underwriting or not, it's a combination of credit score, what's on credit, debt to income ratio, down payment, and reserves/assets - a comprehensive analysis of one's situation.
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