Will I always be able to get a zero-interest credit card?
No.  There is no guarantee that credit card issuing banks will always use 0% introductory rates to entice anyone. "After looking at the comments, and your replies it seems that your mind is made up: ""You will always be able to obtain 0% credit, and nothing bad will ever happen"". Credit cards that offer 0% on balance transfers are very rare.  Most have a transfer fee of some kind, which acts like an interest rate.  This is a change that probably happened 10 years ago without much fanfare.  From this you can draw a lesson: what changes will come in the future? This site and others a full of ""tales of woe"" where people were playing musical chairs with credit, and when the music stopped, there was no chairs in sight.  Job loss, medical expenses, unexpected taxes, natural disasters can all effect one's ability to make payments on time and happen.  Once payments start being missed or are late, things tend to avalanche from there.  It has happened to me, and loved ones. The pain and suffering is not worth it.  Get out of debt. You claim that you are investing the money instead of paying on the debt, and you are making the delta between your prevailing investment rate 7%.  Did you include the balance transfer fee in your calculations?    First off your investments could lose money.  While 2015 was mostly flat, we have not had a correction in a long time.  Some say we are long overdue.   Secondly, how much money are we really talking about here?  Say there is not a balance transfer fee, you could be guaranteed 7%, and you are floating $10K.  Congratulations in this mythical scenario you just made $700. If $700 changes your life dramatically perhaps it is time for a second job.  This way you can earn that every two weeks (working part time) rather than every year.  Now that will really change your life.  By applying this amount of mental energy to make $700, what opportunities are you missing?   Pay off the debt, you will be much better off in the long run."
Generally speaking, an interest-free loan will be tied to a specific purchase, and the lender will be paid something by the vendor. The only other likely scenario is an introductory offer to try to win longer-term more profitable business, such as an initial interest-free period on a credit card. Banks couldn't make money if all their loans were interest-free, unless they were getting paid by the vendors of whatever was being purchased with the money that was lent. Even if you can get a credit card with a $0 limit, that doesn't necessarily mean that the charges won't succeed. Some of my credit cards have gone over limit by a significant amount (e.g. 140% of limit) without any transactions being declined. The limit just means that the bank is allowed to decline the transaction, but they are also allowed to approve it anyway. So basically what you would have is a credit card where any transaction can always be declined or approved. "Pay cash.  You have the cash to pay for it now, but God forbid something happen to you or your wife that requires you to dip into that cash in the future. In such an event, you could end up paying a lot more for your home theater than you planned. The best way to keep your consumer credit card debt at zero (and protect your already-excellent credit) is to not add to the number of credit cards you already have.   At least in the U.S., interest rates on saving accounts of any sort are so low, I don't think it's worthwhile to include as a deciding factor in whether not you ""borrow"" at 0% instead of buying in cash." It's a good idea to have some emergency money so I would propose a plan that keeps some in your savings:  If the 0% goes away, then consider paying it off, but by that time hopefully you have built up your savings a bit more. Also consider the ability to move the balance from the 2% cards to the 0% one, if that is possible. "I gather from your mention of ""stamp duty"" that you're in Britain?  I'm only familiar with US cards, but for them I can't see that there is any reason (other than a lack of self-discipline) not to use a credit card wherever possible, especially these days. 1) There are plenty of cards with no annual fee. 2) You get anywhere from 1-5% discount/cash back on purchases. 3) Many will give you sign-up bonuses, and a year or more of zero interest.  (So you put that money in your investment account, and odds are you make a profit on it.) 4) Even after the introductory 0% interest period, you get on average about a month of 0% interest between purchase and due date, during which period the money can be earning interest for you. I've made a good many thousands of dollars over the years doing this.  Again, the only drawback I can see is that you may not have the self-discipline to pay off the accounts before they start charging interest." This is very much possible and happens quite a lot. In the US, for example, promotional offers by credit card companies where you pay no interest on the balance for a certain period are a very common thing. The lender gains a new customer on such a loan, and usually earns money from the spending via the merchant fees (specifically for credit cards, at least). The pro is obviously free money. The con is that this is usually for a short period of time (longest I've seen was 15 months) after which if you're not careful, high interest rates will be charged. In some cases, interest will be charged retroactively for the whole period if you don't pay off the balance or miss the minimum payment due. "I too am a full-monthly-statement-balance payer and I received a balance transfer offer from my credit-card company. This one was quite different from many others that I have read about on this forum. I could do a balance transfer for any amount up to $X from another credit card, or use the enclosed ""checks"" to pay  some other (non-credit-card) bills, and I would not have to pay any interest for 12 months on the amount thus borrowed.  But, There would be a 2% service charge on the amount I was borrowing. This amount would be billed on the next monthly statement, and it would have to be paid in full by the due date of that month's payment, that is, within the 25-day grace period allowed for payment of monthly statements. Else, interest would start being charged on the unpaid part of the service charge at the usual humongous rate of H% per month. If I had not paid the previous month's balance in full, I would be charged interest at H% per month on the service charge starting from Day One; no free ride till the due date of the next month's statement. Of course, the balance carried over from last month would also be charged interest at H%. If I had paid last month's bill in full, but there were any other charges (purchases) during the current month, then  unless the entire amount due, this month's purchases plus service charge and that ""interest-free-for-twelve-months loan""  balance was paid off within the 25-day grace period, my purchases would be deemed unpaid and would start being charged interest. In short, the only way to avoid paying interest on the amount borrowed was to start with a card showing a $0 balance due on the previous month's statement, not make any charges on that card for a whole year, and pay off that 2% service charge within the grace period. It might also have required that one-twelfth of that interest-free loan be repaid each month, but  I had stopped reading the offer at this point and filed it in the round circular file. In short, while @JoeTaxpayer's tale of how ""As a pay-in-full user, I've used the zero rate to throw $20K at the 5.25% mortgage"" is undoubtedly how things worked once, it is not at all clear that they still work that way. At least, they don't work that way for me.  Heck, once upon a time, for a period of about 3 months, you could earn 1.5% interest per month from the credit card company by overpaying your credit card bill considerably. Their computers then just ""added on"" 1.5% interest by multiplying your credit balance -$X by 1.015 and so you got 1.5% per month interest from the credit card company. The credit card agreements (and the software!) got changed in a hurry, and nowdays all credit-card agreements state in the fine print that if you overpay your bill, you don't earn any interest on the overpayment." Only reason I can think of is that having a credit card, or several, is handy for buying stuff on-line, or not having to haul around a fat wallet full of cash.    Of course for some of us, getting the cash back and 0% interest periods are nice, too, even if we don't really need the money.  Same as for instance trying to get good mpg when you're driving, even if you could easily afford to fill up a Hummer.  It's a game, really. While C/C's have 0% interest this a good mechanism to manage debt. But they expect you will pile up a large debt and at then of the interest free period you will get hammered. So plan your exit strategy.  Plan to pay off the 0% cards at the end of the int free period and pay the other cards down. Alternatively, What you could do is pay off the other cards now by drawing down on the 0% card if its possible. Then.all your debt is at 0% int. Also you are consolidating your debt into 1 account. When the int free period is over move the debt into a single personal loan if you don't plan on paying it all off immrdiatley In the meantime put you savings into an interest bearing account to maximize the value of your savings. "I answered a similar question, How will going from 75% Credit Utilization to 0% Credit Utilization affect my credit score?, in which I show a graph of how utilization impacts your score.  In another answer to Should I keep a credit card open to maintain my credit score?, I discuss the makeup of your score.  From your own view at Credit Karma, you can see that age of accounts will help your score, so now is the time to get the right cards and stay with them.  My background is technology (electrical engineer) and MBA with a concentration in finance. I'm not a Psychology major. If one is undisciplined, credit can destroy them. If one is disciplined, and pays in full each month, credit is a tool.  The quoting of billionaires is a bit disingenuous. I've seen people get turned away at hotels for lack of a credit card. $1000 in cash would not get them into a $200/night room. Yes, a debit card can be used, but the rental car and hotel ""reserve"" a large amount on the card, so if you don't have a high balance, you may be out of town and out of luck.  I'll quote another oft-quoted guru: ""no one gets rich on credit card rewards."" No, but I'm on track to pay for my 13 year old's last semester in college with the rewards from a card that goes right into her account. It will be great to make that withdrawal and not need to take the funds from anywhere else. The card has no fee, and I've not paid them a dime in interest.  By the way, with 1-20% utilization ideal, you want your total available credit to be 5X the highest monthly balance you'd every hit.  Last - when you have a choice between 2% cash reward, and the cash discount Kevin manages, take the discount, obviously." If the bank wants to close your account, they will do just that. Having a small ongoing balance isn't going to prompt them to keep it open.  Typically, the risk is for a card with zero usage to be closed, as it's a cost to them to keep the account open, and it has no revenue. To avoid this, it's a good idea to use that card or cards for a regular purchase, say, gasoline. A non-impulse buy, and just pay in full to avoid interest. There's no need to keep a balance accruing interest.  Keep in mind - A bill contains a month of charges. The bill for December is issued on the 31st, but due January 25th or so. When you pay it in full you do not have zero balance, you have the charges from January. This accomplishes your goal, will no interest. I also had a student loan and glad you are taking a good look on interest rate as it really makes a huge difference. One of the strategies I followed was since my credit improved as I stepped out of school. I took advantage of a good 0 percent credit card. I applied for discover and got a decent credit limit. There are 2 particular things you are looking for in a credit card in this situation  Usually the initial $0 transaction charge is only for a couple of months so ensure you take advantage of that. What is the benefit: Imagine being able to pay off that higher interest rate balance with 0% and not have to worry about it immediately. That way you save on the interest you would be paying and stress as well Watch out for: Although you have to ensure that you do payoff the money you paid through the 0 percent credit card ( which may have been put off for a year or even 15 months or so) other wise you may have to pay it all at once as the offer is expiring. Note: for credit cards ensure to note when the 0% is expiring as that is usually not mentioned on the statement and you may have to call the customer service. I was in a similar situation and was able to pay it all off fairly quickly. I am sure you will as well. 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). "Your use of the term ""loan"" is confusing, what you're proposing is to open a new card and take advantage of the 0% APR by carrying a balance.  The effects to your credit history / score will be the following:" Many banks will let you generate a temporary credit card number to use in this situation.  You can set the credit limit and the expiration date yourself so that the second transaction won't be accepted. I don't know of any that will let you set the credit limit to $0, but you can set it to a value under the monthly subscription fee. An answer to this question suggests that banks sometimes let the charge go through even if it exceeds the limit or the expiration date, so the plan might not work.