using credit card and paying back quickly
Yes, however you would have to wait for the $900 to actually be available in your credit card account if making the transaction from an account from another bank or provider, as it usually might take one to two business days for this to happen.  If both the chequing account and credit card account are with the same bank, then usually this will go through straight away, and you will be able to make your next purchase on the same day, but I would check your credit card balance first before making that purchase. "I can't speak for every credit card, but I know two of mine don't have overage fees. The transaction either goes through, or gets denied. Check your card agreement and look for the fee section. One other thing to consider, sometimes when you make an online payment to a credit card, you will notice that the ""Available Balance"" number on the account will increase right away even if the payment is not reflected on your ""Current Balance"". If this is the case, and you are positive that your payment will be successfully posted to the account, I say go for it."
Correct. By putting expenses on to a credit card which does not charge interest during the grace period, and paying that balance every month, in effect you earn interest on money you've already spent. However, first, savings account interest is something like .05% right now depending on your bank. Yeah it's money, but seriously, that's 4 cents per month on $1000.  Second, two things can make this very wrong. If you carry a balance, you'll pay much more in interest than you'd get from practically any investment you could make with the cash in the meantime. Second, a debit card can be used to get cash you already have from an ATM (not everyone takes credit, you know), and it'll cost you little or nothing. Use a credit card for the same purpose and you're paying 40% from the second the money comes out of the machine. Also correct. Rewards cards earn you more the more they're used. That's because the card issuer makes money based on usage; they get 3% of each transaction. They're happy to turn 1% of that, up to a limit or subject to a spending floor, back around to you. Again, check the terms and conditions. Most cards have a limit on total rewards. Many of them also have fees, either while you hold the card or when you try to redeem the rewards. Look for a card with high limits or no limits on rewards from spending, and with no annual fee or reward redemption fee. In addition to the above, you build good credit history with good spending patterns. However, your credit score can fluctuate wildly, because on one day you have very low leverage (percent of credit limit used), and on the next you've bought $200 in groceries and so your leverage went up 20% on a card with a $1000 limit. Leverage under 10% is good, leverage under 40% is OK and leverage over that starts looking bad. With a $1000 limit, with you maxing it out and then paying it off, your credit score can fluctuate by 30 points on any given day. "never carry a balance on a credit card. there is almost always a cheaper way to borrow money. the exception to that rule is when you are offered a 0% promotion on a credit card, but even then watch out for cash advance fees and how payments are applied (typically to promotional balances first). paying interest on daily spending is a bad idea. generally, the only time you should pay interest is on a home loan, car loan or education loan.  basically that's because those loans can either allow you to reduce an expense (e.g. apartment rent, taxi fair), or increase your income (by getting a better job). you can try to make an argument about the utility of a dollar, but all sophistry aside you are better off investing than borrowing under normal circumstances. that said, using a credit card (with no annual fee) can build credit for a future car or home loan. the biggest advantage of a credit card is cash back. if you have good credit you can get a credit card that offers at least 1% cash back on every purchase.  if you don't have good credit, using a credit card with no annual fee can be a good way to build credit until you can get approved for a 2% card (e.g. citi double cash). additionally, technically, you can get close to 10% cash back by chasing sign up bonuses. however, that requires applying for new cards frequently and keeping track of minimum spend etc. credit cards also protect you from fraud. if someone uses your debit card number, you can be short on cash until your bank fixes it.  but if someone uses your credit card number, you can simply dispute the charge when you get the bill. you don't have to worry about how to make rent after an unexpected 2k$ charge. side note: it is a common mis-conception that credit card issuers only make money from cardholder interest and fees. card issuers make a lot of revenue from ""interchange fees"" paid by merchants every time you use your card. some issuers (e.g. amex) make a majority of their revenue from merchants." "I also feel it's important to NOT get a credit card. I'm in my mid 30's and have had credit cards since I was 20, as has everyone I know. Every single one of those people, with the exception of my dad, is currently carrying some amount of credit card debt - almost always in the thousands of dollars.  Here is the essential problem with credit cards. Everyone sets out with good intentions, to use the credit card like a debit card, and pay charges off before interest accrues. However, almost no-one has the discipline to remember to do this, and a balance quickly builds up on the card. Also, it's extremely easy to prioritize other bill payments before credit card payments, resulting in a balance building up on the card.  It's almost magical how quickly a balance will build up on a credit card. Ultimately, they are simply too convenient, too tempting for most human beings. The world, and especially the North American world, is in a massive debt crisis. It is very easy to borrow money these days, and our culture is at the point where ""buy now pay later"" is an accepted practice.  Now that I have young children, I will be teaching them the golden rule of ""don't buy something until you have cash to pay for it in full!"" It sounds like an over simplification but this one rule will save you an incredible amount of financial grief over time." "The key part of your question is the ""so far"".  So you didn't need a credit card today, or yesterday, or last month - great!  But what about tomorrow?  The time may come when you really need to spend a little more than you have, and a credit card will let you do that, at a very modest cost if you pay it off promptly (no cost, if paid within 30 days). I learned this when I was traveling and stranded due to bad weather.  I had almost nothing in my bank account at the time, and while I actually did have a small student-type credit card, I came really close to having to sleep at the train station when I didn't have enough for another night in a hotel. As an example, if you have close friends or family living across the country, and something tragic were to happen, would you be able to pay for a flight to attend the funeral?  What if you'd recently had an accident and a big medical bill (it doesn't take much, a broken arm can cost $10,000)?  Perhaps you have a solid nest egg, but breaking a CD ahead of schedule or taking short-term capital gains on a mutual fund will usually cost more than one or two months of interest payments." This strategy will have long lasting effects since negative items can persist for many years, making financing a home difficult, the primary source of household credit. It is also very risky.  You can play hard, but then the creditor may choose you to be the one that they make an example out of by suing you for a judgement that allows them to empty your accounts and garnish your wages. If you have no record of late payments, or they are old and/or few, your credit score will quickly shoot up if you pay down to 10% of the balance, keep the cards, and maintain that balance rate. This strategy will have them begging you to take on more credit with offers of lower interest rates.  The less credit you take on, the more they'll throw at you, and when it comes time to purchase a home, more home can be bought because your interest rates will be lower. On the face, this appears a sound method to manage long run cumulative interest, but there are some caveats. Maxing out credit cards will destroy your credit rating.  You will receive no more reasonable offers for credit, only shady ones.  Though your credit rating will rise the moment you bring the balance back down to 10%, even with high income, it's easy to overshoot the 8 months, and then a high interest rate kicks in because of the low credit rating. Further, maxing out credit cards will encourage credit card lenders to begin cutting limits and at worse demand early payment. Now, after month 6 hits, your financial payment obligations skyrocket.  A sudden jolt is never easy to manage.  This will increase risk of missing a payment, a disaster for such hair line financing. In short, the probability of decimating your financial structure is high for very little benefit. If you are confident that you can pay off $4,000 in 8 months then simply apply those payments to the student loan directly, cutting out the middle man.  Your creditors will be pleased to see your total liabilities fall at a high rate while your utilization remains small, encouraging them to offer you more credit and lower rates. The ideal credit card utilization rate is 10%, so it would be wise to use that portion to repay the student loans. Building up credit will allow you to use the credit as an auxiliary cushion when financial disaster strikes.  Keeping an excellent credit rating will allow you to finance the largest home possible for your money.  Every percentage point of mortgage interest can mean the difference between a million USD home and a $750,000 one. "Credit card interest rates are obscene. Try to find some other kind of loan for the furnishings; if you put things on the card, try to pay them off as quickly as possible. I should say that for most people I do recommend having a credit card. Hotels, car rental agencies, and a fair number of other businesses expect to be able to guarantee your reservation by taking the card info and it is much harder to do business with them without one. It gives you a short-term emergency fund you can tap (and then immediately pay back, or as close to immediately as possible). Credit cards are one of the safer ways to pay via internet, since they have guarantees that limit your liability if they are misused, and the bank can help you ""charge back"" to a vendor who doesn't deliver as promised. And if you have the self-discipline to pay the balance due in full every month, they can be a convenient alternative to carrying a checkbook or excessive amounts of cash. But there are definitely people who haven't learned how to use this particular tool without hurting themselves. Remember that it needs to be handled with respect and appropriate caution." I'm not sure if you are including the use of credit cards in the intent of your quesiton.  However, I will give you some good reasons I use them even when I can pay cash: 1) I get an interest free loan for almost 30 days as long as I don't carry balances. 2) I get a statement detailing where I am spending my money that is helpful for budgeting. I'd never keep track to this level of detail if I were using cash. 3) Many cards offer reward programs that can be used for cash back. 4) It helps maintain my credit rating for those times I NEED to buy something and pay it off over time (car, house, etc.) 5) Not so much an issue for me personally, but for people that live paycheck to paycheck, it might help to time your cash outflows to match up with your inflows. For a business, I think it is mostly a cash flow issue. That is, in a lot of B2B type businesses customers can pay very slowly (managing their own cash flows). So your revenue can sometimes lag quite a bit behind the expenses that were associated with them (e.g payroll). A business line of credit can smooth out the cash flow, especially for companies that don't have a lot of cash reserves. If you can use and pay off your credit card in full every month, there are plenty of benefits including improved credit, reward points and more. Many fall into the trap of just making the minimum payments and facing high interest charges or missing payments and getting a hit on their credit reports.  To start off, put something small that you know you can pay off every month. It could be your Netflix or your gas. Make sure you pay it off before any interest is accrued. Over time, you can ask for higher limits to boost your utilization rate. "Most credit cards allow you to take ""cash advances"", but the fees and limits for cash advances are different than for regular purchases. You can buy stock after taking a cash advance from your credit card. When you make a cash advance, you normally pay the credit card company a fee. When you make a regular purchase, the merchant (ie, the stockbroker) pays a fee. Additionally, credit card companies can make merchants wait up to 3 months to actually receive the money, in case the transaction is disputed. Your stockbroker is unlikely to want to pay the fee, accept the delay in receiving the funds, and risking that you will dispute the transaction. Having said that, many FOREX brokers will accept credit card deposits (treated as purchases), although FOREX can be considerably riskier than the stock market. Of course, if you max out your credit cards and lose all your money, you can normally negotiate to pay back the debt for less than the original amount, especially since it's unsecured debt." When you pay off a loan early, you pay the remaining principal, and you save all of the remaining interest. So you do save on interest, but it's the interest you would have paid in the future, not the interest you have paid in the past. (Your remaining balance when you pay off the loan only includes the principal, not the projected interest.) Interest is a factor of the amount borrowed, the interest rate and the amount of time you borrow the money. The sooner you repay the money, the less interest you pay. Imagine if you had taken a 30 year loan at 4% interest but were allowed to make no payments until the loan term ended. If you waited 15 years to make your first payment, you wouldn't owe the same money as if you'd made payments every month. No, instead of owing ~$64k, you'd owe ~$182k, because you had borrowed $100k for 15 years (plus the interest due) rather than borrowing a declining sum. So that's why you don't get a refund on interest for previous months. If you had started with a 16 year loan, then you would have been paying more principal every month, and your monthly amount due would have been higher to reflect that. As you paid the principal off faster, the interest each month would drop faster. Paying a huge portion of the principal at the end of the loan is not the same as steadily paying it down in the same time frame. You will pay a lot more interest in the former case, and rightfully so. It might help to consider a credit card payment in comparison. If you run up a balance and pay only the minimum each month, you pay a lot of interest over time, because your principal goes down slowly. If you suddenly pay off your credit card, you don't have to pay any more interest, but you also don't get any interest back for previous months. That's because the interest accrued each month is based on your current balance, just like your mortgage. The minimum payments are calculated differently, but the interest accrued each month uses essentially the same mechanism. As long as you can be trusted with a Credit Card i find that if you have a setup that uses three accounts: 1. your Credit Card, 2. 2. a high interest internet account (most of these accounts don’t have fees), 3. a savings account.  The Method that works for me is: 1st i calculate my fixed monthly bills i.e Rent and utilities and then transfer it into my high interest account.  for the month whenever i make a purchase i transfer the money into the high interest account ( this way I can keep a running balance of what money I have left to spend in the month. Then when the Credit Card bill comes I transfer the money out of the high interest account across to pay off the Credit Card ( this way you generate interest on the money which you would have spent throughout the month and still maintain $0 of interest from the Credit Card) over a year you can generate at least enough money in interest to go out for dinner on one of free flights! A credit card is essentially a contract where they will loan you money in an on demand basis.  It is not a contract for you to loan them money. The money that you have overpaid is generally treated as if it is a payment for a charge that you have made that has not been processed yet.  The bank can not treat that money as a deposit and thus leverage it make money them selves. You can open an account and get a debit card.  This would allow you to accrue interest for your deposit while using your money.  But if you find one willing to pay you 25% interest please share with the rest of us :) "It is going to save you more money in the long run to pay at once with cash. If you take out a loan, you will pay interest on the balance, costing you money. If you pay off the balance immediately, there is no difference between the options and your question becomes irrelevant.  There is no credit rating benefit to placing large purchases on your cards, especially since your credit is fine. My advice is to pay in cash in this case, mostly because it makes you 'feel' the purchase. This is what you are describing in your question. This instinct helps you recognize potential problems, instead of masking them with debt. Questions like: ""Do I need this?""  ""Am I overextending myself financially with this purchase?""  ""Am I holding enough cash-on-hand for emergencies?"" You may be fine in these areas, but I would still argue that cash makes you a better buyer because the expense feels much more significant, making you more cautious and discerning.  You are right to feel these things before dropping a large sum of money. Let it inform you and help you make better decisions. Don't mask it or be paralyzed by it!" "There are always little tricks you can play with your credit card. For example, the due date of your statement balance is not really set in stone as your bank would like you to believe. Banks have a TOS where they can make you liable to pay interest from the statement generation date (which is a good 25 days before your due date) on your balance, if you don't pay off your balance by your due date. However, you can choose to not pay your balance by your due date upto 30 days and they will not report your late payment to credit agencies. If they ask you to pay interest, you can negotiate yourself out of it as well (although not sure if it will work every-time if you make it a habit!) Be careful though: not all banks report your credit utilization based on your statement balance! DCU for example, reports your credit utilization based on your end-of-the-month balance. This can affect your short term credit score (history?) and mess around with your chances of pulling off these tricks with the bank CSRs. These ""little tricks"" can effectively net you more than 60 days of interest free loans, but I am not sure if anyone will condone this as a habit, especially on this website :-)"