<prompt> Human: I currently have three credit cards with interest rates of 20, 19, and 15. Having recently joined SECU in September I have been looking at their 7.75 interest rate credit cards.The only catch I see is that the 7.75 says that it can vary every 6 months based on the Treasury Bill rate. Im not 100 sure what exactly the Treasury Bill rate is, other than it determines interest rates, but I still dont like seeing variable credit cards.This is taken directly from their credit card agreement:The APR will equal 7.5percentage points plus the Index Rate. The Index Rate is the 26 week Treasury Bill rate set at the first Auction held in January, April, July and October and adjusted up to the nearest 14. Increases in the APR will result in a higher finance charge which may result in additional payments over a longer period in order to repay the purchases balance or your cash advance balance. The increased APR will apply to any balance outstanding on the effective date of the change as well as to future purchases and advances. There is no minimum APR. The APR will not exceed 18 per year or the maximum permitted by applicable law, whichever is lower. The APR and the Monthly Periodic Rate used to compute your finance charge appears on your monthly statement.Anyone have thoughts? While the maximum interest rate will be 18, has it ever in your personal experience reached that high? Edit: Perhaps I should have clarified my goals of this credit card. I use to use my credit cards for every purchase and pay them in full each month. However, getting married, moving twice, etc etc etc I ended up with balances remaining on them over the years. Im now in a position to start paying them down.Eventually I want to use them for all of my purchases again as I personally dont like using my debit card all the time. In the mean time, Im looking to reduce the interest rates so that I can pay them off quicker. This will probably take 8-12 months. Im also not exactly interested in a 0 APR as the interest rate will sky rocket after 12 months and I dont want to keep dinging my credit score bouncing around credit cards. Additionally SECU offers a 0 transfer fee whereas I see at least 3 with most other cards.So looking into the future, should I EVER have to carry a balance again, Id rather it be on a 7.75 interest card rather than a 20 interest card. I guess Im looking for a card to hold for a long time that will have a low interest rate incase I have an emergency while building my emergency fund.  <response>: Very few people here care about interest rates on credit cards because we dont or try not to carry a balance. If Im using a credit card its because of the rewards like points or cash back, interest rates are meaningless. If youre looking for a low interest rate for some reason just find a card with a 0 introductory APR. Chase has one that lasts 15 months, I think Citi has one that lasts 18 months. For example a very responsible person could take advantage of 0 intro APR to make a large purchase like supplies for a big home project or home emergency and not have to dip into their emergency fund because sometimes emergencies come in waves, like when you cut your finger off renovating your bathroom... 