Rewards checking accounts might earn interest or provide a generous sign-up bonus, but some carry high monthly fees — think $20 or more — unless customers keep their accounts padded with an almost comically high balance or meet some other requirement.

Still, finding a rewards checking account that doesn’t have steep fees and requirements is possible. Here’s a look at how to qualify for one of these accounts — and whether you should even want to.

Rewards checking accounts often come with excellent perks, such as:

Sometimes, the highest APYs are tied to balances. For example, you may earn a high rate only if you keep your balance under $10,000. Know the requirements involved, including what it takes to waive the monthly fee, in order to get the best deal.

Although the criteria to receive these benefits vary by account, generally you’ll have to meet a few requirements, such as:

You may be asked to fulfill all of these requirements, some combination of the three or different ones altogether; keeping a minimum balance is another popular one. It depends on the account. Check to see what those requirements are, and ask yourself whether you could meet them on a regular basis.

» MORE: What is a checking account?

If an account truly is free, there isn’t much downside to choosing one that offers rewards as well. Even if you don’t qualify for any of the add-ons, you’ll still have a free account. That’s a win in and of itself.

Problems arise, though, if you find yourself straining to meet the monthly requirements to have fees waived. For example, by forcing more debit card transactions than usual, you may end up overstepping your budget and triggering an overdraft. In that case, the interest you’ve earned won’t make up for excessive spending and fees.

There’s nothing wrong with having rewards sway your decision if you’ve narrowed down your search to two accounts that suit your needs. If that’s the case, then by all means go for the one that does more than just store your money.

But don’t let flashy rewards lure you into signing up for an account that could do more harm than good.

Tony Armstrong is a staff writer at NerdWallet, a personal finance website. Email: tony@nerdwallet.com. Twitter: @tonystrongarm.

Updated March 20, 2017.

The article What Is a Rewards Checking Account? originally appeared on NerdWallet.