Have you ever found yourself opting to pay using your credit card just because you’d get the rewards? I know I have — and it totally works as long as you have the cash on hand to pay your balance off each and every month. I confess that I hold cards for Nordstrom, GAP and Macy’s, but I’ll also admit that juggling that many cards requires very careful record-keeping and financial discipline.

It’s a slippery slope

There’s a reason that credit card companies are constantly upping the ante in offering rewards to card members — they know that it can take just one swipe to start earning them big bucks in interest, in addition to the fees they collect from the merchants who accept their cards. All it takes is one delayed expense reimbursement check to put you over the ability to pay your balance in full, and once you get behind on your balance, it can feel like a real uphill battle to get back to zero.

Rarely do people set out with the intention of burying themselves in debt. It’s usually a slippery slope that turns into a landslide.

How to stay in debt-free territory

The key to success here is making sure you have enough cash available when it comes time to pay off your card each month, right? The only way to do this is to treat the swipe of your credit card as if you were laying down actual dollar bills – every single swipe, every single dollar even with emergencies or extraordinary expenses – actually, especially with emergencies or extraordinary expenses.

And you can’t mix and match spending between using cash and credit by swiping your bank debit card here and your rewards card there. You have to pick one or you’ll end up in trouble.

Keep a separate account

This may seem like a royal pain, but one way to stay ahead of the game is to open a separate savings account that’s linked to your checking where you can simply move the amount you charged each day over to your savings, so you’re literally separating out your balance. Make sure you use a bank that doesn’t charge for transfers or require a minimum balance — there are definitely online banks that offer this feature. This requires almost daily maintenance, but if money is tight, it’s worth it to keep yourself out of debt.

Pay your store cards off right away

There’s no rule that says you have to wait until you receive a statement to make a payment, so one way to make sure you aren’t surprised by a bill from a store card that you use to get a discount is to just pay the card off the same day you charge to it. Some stores even let you make your payment right there at the sales counter.

Track your card balance against your checking balance

The way I stay ahead of my balance is by maintaining a running tally of my credit card balance against my checking account balance. I factor in other bills that are auto-debited like the mortgage or electric bill, and just make sure that the projected balance never dips below zero. If I do find myself getting close to zero balance territory, I know that I either have to stop spending until my next paycheck or statement cycle or move money over from savings.

No matter what method you use, the most important thing is to make sure you’re paying the balance in full each month. Using a card to earn frequent flier miles only to pay double-digit interest on the spending completely negates the benefit of the “free” flight. You might as well save the money you’re paying the bank in interest and buy your trip the old fashioned way — by paying cash.

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