Pay your card in full every month: why interest outruns travel points, and how to set up autopay

Every strategy on this site rests on one rule: pay each card's full statement balance, every month, by the due date. Travel cards charge high interest, and a few months of it can cost more than a welcome bonus is worth to you. The simplest protection is to set every card to pay itself in full automatically, the day it arrives.

Interest costs more than the points earn

Rewards cards carry high interest rates. On October 1, 2026, Chase's pages listed variable purchase APRs from 19.49% to 27.74% for the Sapphire Preferred and from 19.74% to 28.24% for the Sapphire Reserve. Your own rate is printed on your statement.

The Consumer Financial Protection Bureau explains how that interest is charged: "Many credit card companies calculate the interest you owe daily, based on your average daily account balance." A rough monthly estimate is the balance, times the APR, divided by 365, times the days in the month.

Take the Sapphire Reserve's welcome offer as an example. To earn its 100,000 points, you spend $6,000 in three months. Suppose that $6,000 is left unpaid:

These are simple estimates; your statement shows the actual charge. They come on top of the Reserve's $795 annual fee. Whatever the 100,000 points are worth to you, a year of interest on the spend that earned them can take most or all of it. Points earn nothing back on the interest you pay.

The grace period, and how to lose it

If you pay in full, you normally pay no interest on purchases at all. That is the grace period. The CFPB: "If your card gives a grace period and you are not carrying a balance, then you can avoid paying interest on new purchases if you pay your balance in full by the due date."

Paying in full most months is not enough. The CFPB again: "If you pay in full some months, and not in other months, you may lose your grace period for the month that you don't pay in full and for the month after." Once it is gone, "you will also be charged interest on purchases in the new billing cycle starting on the date each purchase is made."

Two related traps:

• Cash advances have no grace period. "If you use your card to get a cash advance or use a check you received from your card issuer, generally you must start paying interest as of the date of the transaction."
• The minimum payment is not the safe choice. It avoids a late payment, but the CFPB is plain about the rest: "you will be charged interest on the unpaid portion of the balance."

Set up autopay for the full balance

Automatic payment takes the risk of forgetting out of your hands. Chase's own advice: "When setting up automatic payments to cover the full balance of your account, make sure that you are setting payments with a bank account that can cover the balance."

Whichever bank issued the card, choose the option that pays the whole statement balance. The names differ:

Chase, in the Chase Mobile app

Chase lists four steps:

1. "After signing in, choose the account for the card you want and tap 'Pay card.'"
2. "Tap 'Set up' next to 'Automatic payments.'"
3. "Choose your payment amount and the account you want to pay from." The amount screen offers "Minimum due," "Statement balance," and "Fixed amount." Choose Statement balance.
4. "Review your choices and tap 'Set up automatic payments.'"

On chase.com, Chase says to look in the payment or pay-bill section for "automatic payments." You can also call the number on the back of the card.

American Express

Amex: "You can enroll in AutoPay through your online account. If you have multiple Cards, select the Card you want to enroll in AutoPay from the list." Choose Total New Balance. In Amex's terms, that means "American Express will debit my Designated Account for the entire New Balance shown on my billing statement."

Three Amex details worth knowing:

• Only the main cardholder can set it up. "Only Basic Card Members can enroll in AutoPay."
• The first bill may be yours to pay. "Your first AutoPay payment may not be applied to your current billing cycle. Please make payments as you usually would until your AutoPay begins."
• Changes need notice. A change or stop "must be received by American Express at least two (2) business days before the scheduled debit date on my billing statement."

After you turn it on

• Do it the day a new card arrives. The welcome-bonus months are when the card carries its biggest balances.
• Pay the first statement yourself if autopay has not started yet. Check that it shows as scheduled.
• Keep the bank account funded. Chase: "The main risk to automatic credit card payments is the possibility of overdrafting your bank account, which means you could miss your scheduled automatic payment."
• Still read each statement. Chase suggests a monthly review so "you catch fraud if it exists."

For couples

Every card is its own account, with its own statement, due date and autopay. When you plan cards for two people, check each person's cards separately. One card left on "minimum due" is enough to start paying interest.

Spend only what you would spend anyway. A welcome bonus is worth chasing when planned expenses, like a home project or a year's groceries, meet the minimum spend. It is not worth chasing by buying more than you can pay off when the statement arrives. Slow Travel Retirement's planner works from the spending you tell it you have planned, so its plans fit spending you already expect.