6 MustDos Before Buying a Home

"It's a brave, new world with respect to credit requirements for mortgages," says John Ulzheimer, founder of 2StepCredit.com and formerly of FICO, which pioneered credit scoring.

One old rule still applies: The higher your credit score, the lower your down payment and monthly payments.

"Below 660 or 680, you're either going to have to pay sizable fees or a higher down payment," Zigas says. And that's pretty much the cutoff score for getting a mortgage, he says.

Vicki Bott, deputy assistant secretary for single-family housing at the Department of Housing and Urban Development, says that her office has noticed much the same thing. "While there are many qualified borrowers in the 580 range, the market today is probably (looking for) 640 to 660, at a minimum," Bott says.

On the other end, a score of 700 to 720 will get you a good deal and 750 and above will garner the best rates on the market, Ulzheimer says.

Improve your chances by: pulling your credit reports and ensuring you're not being unfairly penalized for old, paid or settled debts, Zigas says.

Stop applying for new credit a year before you apply for financing. And keep the moratorium in place until after you close on your home, Ulzheimer says.

Depending on your credit and financing, you'll typically need to save enough money to put anywhere from 3.5 percent to 20 percent down.

If you're using FHA financing, then you need a score of 500 or higher. And in the 500 to 579 range, if you can find a lender, you'll have to put 10 percent down instead of 3.5 percent.

One exception: Veterans Affairs loans, which require no down payment.

Another cash expense: closing costs. Whatever your loan source, you'll also need money to pay closing costs, which run (depending on where you live), from $2,300 to $4,000. Get the average closing costs in your state at Bankrate's closing costs map.

Improve your chances by: Along with banking your own money, search out down payment assistance, Tiffany says. Often it's location-based or tagged to a certain type of buyer, like first-timers, she says. So do an Internet search with the city name, then the county name, along with word combinations such as "down payment assistance," "first-time homebuyers" and "homebuyer's assistance."

In a buyer's market, you can also negotiate to have the seller pay a portion of the closing costs.

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