Should I buy a home while still paying student loans?

Money guide for Millennials
Money guide for Millennials

I am a millennial with student loans which makes saving for a down payment on a house difficult. I am currently renting and feel like I may be throwing my money down the drain when I could be building equity. Should I consider a low down payment option or put off buying a home until I can afford the recommend 20% down payment? -Zach Cain, 24, Atlanta

The decision to become a homeowner is likely to be the biggest financial commitment you'll make, and many factors should be taken into account.

First, let's tackle whether it makes sense to become a homeowner. Writing a monthly rent check can seem like throwing away money, but piling mortgage debt on top of student loans can create a long-term budget crunch.

"With student loan debt, your asset is your education and no one can take that anyway," said Certified Financial Planner Travis Sollinger at Fort Pitt Capital Group. "But if you buy a house and you can't afford the payments, they will take the house."

Along with your credit score, your debt-to-income ratio is one of the most important numbers banks look at when issuing a loan. This number helps lenders determine your ability to repay.

To determine your ratio, add up all your monthly debts, including car, student loan and credit card expenses and the potential mortgage payment, and divide it by your gross monthly income. In order for a mortgage to be backed by the government, this number can't be higher than 43%.

Low mortgage rates and high rents make buying an attractive option, but you should be ready to put some roots down. If you're planning to stay in a home for at least two years, buying is more financially advantageous than renting in 70% of housing markets, according to a recent report from Zillow.

Hey Millennials: What's your most pressing money question?

Now let's weigh your down payment options.

Down payment size impacts the total cost of a loan. A bigger down payment means you're borrowing less from the bank, which lowers monthly payments. It can also lower your loan's interest rate, reducing how much you'll pay in interest over the life of the mortgage.

The average down payment on a conventional 30-year mortgage was 17.5% in the fourth quarter of 2015, according to LendingTree.

But there are other options if you don't have that much cash sitting around. The Federal Housing Administration backs mortgages that require as little as 3.5% down.

Putting less down will likely lead to higher interest rates on the loan, but with interest rates still so low, now could be the time to pounce. "Given the current environment, it's not going to be that big of a difference," said Sollinger. "It adds up over 30 years, but it's better than continuing to rent for the next five to 10 years. If you itemize, the cost of that money is pretty darn cheap."

Keep in mind that if you don't put 20% down, there's a good chance the lender will require private mortgage insurance. These premiums protect the lender if you miss a payment.

Related: What will your mortgage payment be?

When figuring out how much money to put down, don't wipe out your savings account, advised Bill Van Sant, certified financial planner at Girard Partners. It's a good idea to keep a cushion to cover things like closing costs, moving expenses, home insurance and furniture shopping.

But the decision to buy a home isn't all about money. Becoming a homeowner comes with a lot of responsibilities: You're in charge when the dishwasher stops working, the basement floods, or there's an uninvited critter house guest. Make sure you're willing to handle those responsibilities as well.

Hey Millennials: What's your most pressing money question? Ask us and you could be featured in an upcoming story on CNNMoney. Please include your name, age, and city.

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