Miles are a currency your credit card issuer creates, and you earn them by spending money

When you use a credit card that offers miles, the issuer tracks how much you spend and converts that spending into miles at a rate they set. Most cards earn one mile per dollar spent, though some earn two or three miles per dollar on certain categories like flights or restaurants. The miles sit in an account tied to your card, and you decide when and how to use them.

Miles are not money. They have no cash value, and you cannot withdraw them as dollars. They exist only within the rewards program the card issuer runs. If you close the card or the issuer shuts down the program, you lose the miles you have not yet used — this has happened when airlines or card companies end partnerships.

The miles you earn belong to the card issuer's program, not to you outright. You hold the right to redeem them under the program's rules, which the issuer can change. Reading the terms matters because the redemption options, the point values, and the blackout dates all come from the issuer, not from you.

Key Takeaways

  • Miles are earned at a rate set by the card issuer — usually one mile per dollar spent — and sit in an account you access through the card's rewards portal.
  • The value of a mile varies widely depending on how you redeem it: a mile used for a domestic flight might be worth 1 cent, while the same mile used for a premium cabin seat might be worth 3 cents or more.
  • Redeeming miles for flights directly through the card issuer or airline is the most common option, but miles can also be transferred to airline partners, used for hotel stays, or converted to statement credits.
  • Miles expire or are forfeited if you close the card, stop using it for an extended period, or if the program ends — check your card's terms for inactivity rules.
  • The actual value you get from miles depends on how strategically you redeem them; using them on high-demand flights or premium cabins yields more value than using them on cheap routes.

How you earn miles and where they go

Every time you swipe or tap your card, the issuer logs the transaction and adds miles to your account. The earning rate is fixed by the card — you do not negotiate it. Some cards earn the same rate on all purchases; others earn bonus miles in specific categories. For example, a card might earn three miles per dollar on flights booked through the card's travel portal, one mile per dollar on restaurants, and one mile per dollar on everything else.

Your miles live in an online account you access through the card issuer's website or app. You can see your balance, check redemption options, and track expiration dates from there. The issuer sends you statements showing miles earned each month, just as they show you dollar charges. You do not receive physical miles or a separate account number — it is all digital.

Some cards also offer sign-up bonuses: you earn a large number of miles just for opening the card and meeting a minimum spending requirement within a set timeframe, usually three to six months. A typical bonus might be 50,000 miles if you spend $3,000 in the first three months. These bonuses are how many people accumulate enough miles for a free flight quickly.

What a mile is actually worth when you redeem it

A mile has no fixed dollar value. Its worth depends entirely on what you redeem it for. The same mile might be worth 1 cent if you use it for a cheap domestic flight, or worth 3 cents if you use it for a premium cabin seat on an international flight. This is why redemption strategy matters — you can waste miles by redeeming them poorly, or maximize their value by choosing high-value redemptions.

The issuer sets the mile cost for each flight or hotel stay in their redemption catalog. A short domestic flight might cost 25,000 miles; a long international flight might cost 100,000 miles. These costs do not always match the actual dollar price of the ticket. A $400 flight might cost 30,000 miles one day and 35,000 miles another day, depending on demand and availability. You have to check the catalog each time you want to redeem.

To figure out whether a redemption is worth it, divide the dollar value of what you are getting by the number of miles you are spending. If a $300 flight costs 30,000 miles, that mile is worth 1 cent. If a $600 business class flight costs 60,000 miles, that mile is worth 1 cent as well — but if the same flight costs 40,000 miles, that mile is worth 1.5 cents, which is a better deal. Tracking these ratios helps you spot when the issuer is offering good value and when they are not.

The main ways to use your miles

The most common redemption is booking a flight through the card issuer's travel portal or directly through an airline partner. You search for flights, see the mile cost, and redeem if the price seems fair. Some cards let you transfer miles to airline partners at a set ratio — for example, one mile on your card might convert to one mile in an airline's program, or sometimes at a worse rate like 1.2 miles on your card for 1 mile in the airline program. Transferring can sometimes unlock better redemption rates, but it also means you lose the flexibility of your card's portal.

Hotel redemptions work similarly. You search for hotels in the issuer's catalog, see the nightly rate in miles, and book if it makes sense. Some cards offer a flat rate per night; others vary the cost by location and season. A night at a budget hotel might cost 10,000 miles, while a night at a luxury resort costs 50,000 miles.

Many cards also let you convert miles to a statement credit — essentially using miles to pay down your bill. The conversion rate is usually poor, often 0.5 to 1 cent per mile, which is why this option is typically the worst use of miles. Some cards offer other redemptions like car rentals, gift cards, or merchandise, but these also tend to undervalue your miles compared to travel redemptions.

What happens to miles if you stop using the card or close it

Most card issuers have inactivity rules: if you do not use the card for 12 to 24 months, they may expire your miles. The exact timeframe varies by issuer and card. Some issuers are stricter and expire miles if you close the card, even if you have not used it in a while. Others let you keep miles for a set period after closing, usually one to three years.

Read your card's terms and conditions to find the expiration policy. If you have accumulated a large balance of miles and plan to close the card, redeem them before you do. If you want to keep the card open to preserve miles but do not use it regularly, make one small purchase every year or so to reset the inactivity clock.

If the card issuer ends the rewards program entirely — which has happened when airlines merge or partnerships dissolve — you typically have a grace period to redeem your miles before they disappear. The issuer will notify you, but the window is often only a few months, so paying attention to your account matters.

How miles compare to cash back and other rewards

Some credit cards offer cash back instead of miles. Cash back is simpler: you earn a percentage of your spending as dollars, and you can use those dollars however you want. A 2% cash back card gives you $2 for every $100 you spend. You can redeem it as a statement credit, transfer it to a bank account, or use it to pay your bill.

Miles are more complex because their value depends on your redemption choices. A miles card might offer better value than cash back if you redeem strategically — a $600 business class flight for 40,000 miles is worth 1.5 cents per mile, which beats most cash back rates. But if you redeem miles poorly or convert them to statement credits, you might get only 0.5 cents per mile, which is worse than cash back.

The choice between miles and cash back depends on how much you travel and how willing you are to optimize your redemptions. If you fly regularly and enjoy hunting for good deals, miles can be worth more. If you rarely travel or want simplicity, cash back is usually the better choice.

Frequently Asked Questions

Do I lose my miles if I pay off my credit card balance?

No. Miles are earned based on spending, not on carrying a balance. You earn miles the moment the transaction posts, regardless of whether you pay the bill immediately or later. Paying your balance in full does not affect your miles balance at all.

Can I transfer miles to someone else?

Most card issuers do not allow you to transfer miles to another person's account. Some programs let you use miles to book a ticket for someone else, but the miles stay in your account. A few issuers allow transfers between family members on the same account, but this is rare. Check your card's rules.

What if the flight I want costs more miles than it did last week?

Mile costs for flights change based on demand and availability, just like dollar prices do. The issuer adjusts the cost dynamically. If you see a flight you want, redeeming it right away is usually safer than waiting, because the price might go up. Some cards offer price-lock features, but these are uncommon.

Are miles taxed as income?

Miles earned through normal credit card spending are not taxed as income by the IRS. However, large sign-up bonuses have occasionally been treated as taxable income in specific situations, though this is rare and depends on the circumstances. Consult a tax professional if you have concerns about a specific bonus.

What is the difference between miles and points?

Miles and points are the same thing — different issuers just use different names. Airlines typically call them miles; hotel programs and some credit cards call them points. The mechanics are identical: you earn them through spending, they have no fixed cash value, and you redeem them for travel or other rewards.