Repay loans or invest in the market? What to do with a tax refund

I got a big tax refund this year and am trying to figure out what to do with the money. Right now I have school loans with a 4% interest rate that I do not need to make a payment on until 2024 with my current payment plan, but the amount I owe is pretty hefty and I know it's going to compound more over time. I also have a very low-interest car loan (1.9%) that will be paid off in 31/2 years. I also could put that money in the market in hopes that it will grow. I should add I am 27 years old. Any advice?

Answer: Yes: Please review the terms of your student loans, because it's likely you've misunderstood your obligation.

Federal education loans typically don't allow you to go 10 years without payment, said financial expert Mark Kantrowitz, publisher of Edvisors Network.

"With federal education loans, the economic hardship deferment has a three-year limit and most forbearances have a three-year limit, with one or two having a five-year limit," Kantrowitz said. "One could potentially consolidate the loans after getting a deferment and forbearances to reset the clock and thereby get a new set of deferments and forbearances on a new loan. But most of the forbearances aren't mandatory, so one can't count on stacking deferments and forbearances to get a 10-year suspension of the repayment obligation."

Another possibility is that you've signed up for an income-based repayment plan that has reduced your payment to zero, but your eligibility is determined year by year. "2014 is a very specific date, so it seems unlikely that this is [income-based repayment]," Kantrowitz said.

"The most likely scenario is this borrower is misunderstanding the terms of his loan," Kantrowitz said. "The next most likely scenario is that this borrower is not referring to a qualified education loan, but to a particular personal loan that he was able to obtain that few other borrowers would be able to obtain."

Whatever the case may be, one of the best uses for a windfall is to boost your retirement savings. Even if you don't have a workplace plan, you could set up an IRA or a Roth IRA as long as you have earned income.

Once you're on track for retirement, your next goal would be to build your emergency fund, since you don't have any high-rate debt. Once those goals are met, you can start paying down lower-rate debt (such as your student loans).

Tax-advantaged 'buckets'

Dear Liz: I left a job several years ago to become a full-time freelancer. I have a SEP IRA and a SIMPLE IRA from that job that have basically just been sitting there. What are my options in moving this money to a better retirement investment?

Answer: SEPs and SIMPLEs are just the tax-advantaged buckets into which you (and your then-employer) put money. It's the investments you choose within those buckets that determine what kind of returns you'll get. The financial institution that's holding these accounts can be a factor as well: If it's charging a lot of fees, your returns will suffer accordingly.

Your best bet is to make sure the accounts are being held at a low-cost provider and that you have sufficient exposure to stocks to offer growth that will offset inflation over time. Most discount brokerages and mutual fund companies offer target-date maturity funds that give you diversification, professional asset allocation and automatic rebalancing at a low cost.

Timing for Social Security

Dear Liz: I just got laid off and will be collecting unemployment. In January, I will be eligible for Social Security at my full retirement age of 66. Can I collect 50% of my spouse's benefits (he is 76) instead of collecting on my record and continue to let my Social Security benefits grow until age 70?

Answer: Yes. As long as you wait until your own full retirement age to apply for spousal benefits, you retain the option of switching to your own benefit later. If you apply for spousal benefits early, you are locked into the smaller payment and can't switch.