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Ask A Realtor: Buy Now Or Wait To Save A Larger Down Payment?

We have good credit and $8000 saved up for a down payment. Would this be the best time to buy a home? Or should we wait 1 year to get a bigger down payment (we should have about $25,000 by then) in your opinion will the interest rates rise enough in the next few months that a bigger down payment wont make much difference?