Is it possible for me to keep my credit card APR at 0% permanently?
If you pay your statement balance in full before the due date you will never pay a cent in interest no matter what your interest rate is.*  In fact, I don't even know what my interest rates are. Credit card companies offer this sort of thing in the hopes you will spend more than you can afford to pay completely in those first 15 months.  * Unless you use a cash advance, with those you will accrue interest immediately upon receiving the cash sometimes with an additional fee on top. "Banks are in it to make money. But they're expected to provide a social good which powers our economy: secure money storage (bank accounts) and cashless transactions (credit/debit cards).  And the government does not subsidize this.  In fact, banks are being squeezed. Prudent customers dislike paying the proper cost of their account's maintenance (say, a $50/year fee for a credit card, or $9/month for a checking account) - they want it free.  Meanwhile government is pretty aggressive about preventing ""fine print"" trickery that would let them recover costs other ways.  However there isn't much sympathy for consumers who make trivial mistakes - whether they be technical (overdraft, late fee) or money-management mistakes (like doing balance transfers or getting fooled by promotional interest rates).  So that's where banks are able to make their money: when people are imprudent.  The upshot is that it's hard for a bank to make money on a prudent careful customer; those end up getting ""subsidized"" by the less-careful customers who pay fees and buy high-margin products like balance transfers.  And this has created a perverse incentive: banks make more money when they actively encourage customers to be imprudent.  Here, the 0% interest is to make you cocky about running up a balance, or doing balance transfers at a barely-mentioned fee of 3-5%. They know most Americans don't have $500 in the bank and you won't be able to promptly pay it off right before the 0% rate ends.  (or you'll forget).  And this works - that's why they do it.   By law, you already get 0% interest on purchases when you pay the card in full every month.  So if that's your goal, you already have it.  In theory, the banks collect about 1.5% from every transaction you do, and certainly in your mind's eye, you'd think that would be enough to get by without charging interest.  That doesn't work, though.  The problem is, such a no-interest card would attract people who carry large balances.  That would have two negative impacts: First the bank would have to spend money reborrowing, and second, the bank would have huge exposure to credit card defaults.   The thing to remember is the banks are not nice guys and are not here to serve  you.  They're here to use you to make money, and they're not beneath encouraging you to do things that are actually bad for you. Caveat Emptor." No. There is no incentive for the card issuer to permanently loan you money for free (Even though they make a small amount of money with every transaction). Yes, there are many credit cards that offer introductory 0% APR, often lasting for a year, some even two years. In theory, you could keep applying for new cards with these terms, and continually transfer the balance to the new card (Though you would probably incur a fee for doing so). Banks don't care that you are responsible cardholder. They care to make money. Interest rates are basically 0% by government policy and the banks charge their responsible cardholders 20% interest rates. Think about that for one second, and realize they really do not care about your ability to avoid paying interest, they only need you to 'slip up' one month during your entire lifetime to make a profit from you. It is in their interest for you to get into a spending habit, from 0% promo rates, so that eventually a frivolous purchase or life changing event causes a balance to stay on the card for over one month. No. The intro rate is a gambit by the bank - they accept losing money in the short term but expect to gain money in the long term when your intro is over and you (hopefully) start paying interest. There's not much in it for them if you never get around to paying interest. Same can be said for people who close the card after their intro period, but that's different - the bank is correctly expecting that most people won't bother.
You mentioned you have a bunch of credit cards with no balance, while others have fairly high balances I would not recommend you to close the 0 balance credit cards if they have lower APR. You can transfer the balance to those cards with lower APR. Now, if those 0 balance cards do not have lower APR, closing them will reduce my overall balance and hurt my credit rating and that is true, assume that you mean overall credit line instead of overall balance. But to my understanding, if you keep the payments good and on time, that effect is only temporary, and therefore you can definitely close them.  Don't forget, paying off your balance can also lower your utilization rate and therefore increase your credit ratings, and you can focus more on that instead. Also larger number of accounts with amounts owed can indicate higher risk of over-extension, therefore you should pay off your low balance accounts first, and do not open new credit accounts until you have paid off the current balance. "I am interested in seeing what happens to your report after you test this, but I don't think it's possible in practice, would not affect your credit score, and also wouldn't be worth it for you to carry a negative balance like that. Having a -1% credit utilization essentially means that you are lending the credit card company money, which isn't really something that the credit card companies ""do"". They would likely not accept an agreement where you are providing the credit to them. Having credit is a more formal agreement than just 'I paid you too much this month'. Even if your payment does post before the transaction and it says you have a negative balance and gets reported to the credit bureau like that, this would probably get flagged for human review, and a negative credit utilization doesn't really reflect what is happening. Credit utilization is 'how much do you owe / amount of credit available to you', and it's not really correct to say that you owe negative dollars. Carrying a negative balance like that is money that could be invested elsewhere. My guess is that the credit card company is not paying you the APR of your card on the amount they owe you (if they are please provide the name of your card!). They probably don't pay you anything for that negative balance and it's money that's better used elsewhere. Even if it does benefit your credit score you're losing out on any interest (each month!) you could have earned with that money to get maybe 1-2% better rate on your next home or car loan (when will that be?).  TLDR: I think credit utilization approaches a limit at 0% because it's based on the amount you owe and you don't really owe negative dollars. I am very interested in seeing the results of this experiment, please update us when you find out!" You can take a out loan against your 401k, which means you won't be penalized for the withdrawal. You will have to pay that amount back though, but it can help since the interest will be lower than a lot of credit card rates. You could refinance your home if you can get a reasonable interest rate. You could also get a 0% APR balance transfer credit card and transfer the balance and pay it off that way. There are a lot of options. I would  contact a Credit Counselor and explore further options. The main objective is to get you out of debt, not put you more in debt - whether that is refinancing your mortgage, cashing in an annuity, etc. I haven't had a credit card in fifteen years. I use nothing but my debit card. (I find the whole idea of credit on a micro scale loathsome.) I have yet to encounter a single problem doing so, other than a lower than usual credit score for not keeping 23(!!!) revolving lines of credit open, or that's the number CreditKarma tells me I need in order to be an optimal consumer. In an nutshell, no, you don't NEED one. There are reasons to have them, but no. "I think this advice to carry a balance each month is nonsense.  You're just wasting money that way.  Personally, I have always paid off my credit cards every month for as long as I can remember, and my credit score is only 8 points below the max.  The bigger factors by far are: It might be good advice to charge a small amount each month on your credit cards each month in order to keep seldom-used accounts active (remember, longer payment history is better), but there's no reason not to pay off the balance to avoid the interest charges.  In short, the ""ideal balance"" to carry month-to-month on a credit card is zero." Sometimes there are credit cards that offer a (promotional) 0% APR on transfers with no transfer fees.  It can be a good option to move the money to one of these if you're disciplined enough to keep hacking away at the debt before the APR jumps. Yes, this will reduce your total interest. But not by much. Scenario 1: You run up bills for the month totaling $750, and then at the end of the month you get paid and pay $750. Scenario 2: You pay $750 at the beginning of the month. Then over the course of the month you run up bills totaling $750. Assume you have carryover debt of over $750 so you don't have a credit balance at any point. Either way, the net change in your balance for the month is zero. Assuming you spent about the same amount of money each day, the difference in your average daily balance will be $750. If you're paying 18% -- I think that's a fairly typical credit card rate -- that's 1 1/2% per month, so the difference in interest will be about $10. Note this is the most extreme case, the difference between paying on the first day of the billing period and paying on the last day of the billing period, and assuming that you pay all your bills by credit card. So in real life the difference in the interest will probably be less. You're talking about a technique to save maybe five bucks a month. I suppose every dollar helps. But the real solution is to get your credit cards paid off so you're not paying ANY interest. If you think you can pay off the entire amount you borrowed over the next 12 month, then you're getting an unsecured loan at around 4% APR, assuming you're borrowing for the whole year.   That's pretty good compared to what you can typically get at the credit union.  However, if you only need the money for, say, 3 months, that 4% fee effectively becomes a 16% APR! And, the real trouble comes when you don't pay it off by the end of the 12 month and the standard rate kicks in. If you do use the convenience check, be sure to put in your calendars a reminder that the balance is due -- set the reminder about a month before the last billing cycle of your 0% period. Make sure you also have sufficient cash flow and an automated payment setup to make sure you always pay at least the minimum due on time.  Depending on your banking history, you might be able to get away with one missed payment -- but more likely, you'll be penalized as soon as you miss a payment by a penny or a day -- and the 0% loan suddenly becomes very expensive. Read all the fine print, make sure you understand them, and set up a system to make sure you can play to the rules of the game.