Term loan overpayment options: applied to principal, or…?
It may have been the standard practice for a long time, and indeed it still is the common practice for my credit union to apply all excess payment directly to the principal. At the risk of sounding a little cynical, I will suggest that there is a profit motive in the move to not applying excess payments to principal unless directly instructed to do so. Interest accrued isn't reduced until the principal is reduced, so it benefits the creditor to both have the money in advance and to not apply it to the principal. You should probably move forward with the expectation that all of your creditors are adversarial even if only in a passive-aggressive manner.
First thing's first: migrate your savings to an interest-bearing savings account (such as from Ally Bank). While it still lags behind inflation, 0.84% is still better than 0.00%. Short-term CDs are also an option. I've personally thought about experimenting with peer-to-peer lending, but a few thousand in savings isn't all that much in the grand scheme of things, and you don't want it tied up in a risky, speculative loan when you might need it the most. As the others have said, the general savings rules apply too: pay off high-interest debt, divert more money into your 401k (especially if you aren't hitting the match yet), then work on either whittling down other debts or saving more for a big purchase in the future. "In most cases of purchases the general advice is to save the money and   then make the purchase. Paying cash for a car is recommended over   paying credit for example. For a house, getting a mortgage is   recommended. Says who? These rules of thumb hide the actual equations behind them; they should be understood as heuristics, not as the word of god. The Basics The basic idea is, if you pay for something upfront, you pay some fixed cost, call it X, where as with a loan you need to pay interest payments on X, say %I, as well as at least fixed payments P at timeframe T, resulting in some long term payment IX. Your Assumption To some, this obviously means upfront payments are better than interest payments, as by the time the loan is paid off, you will have paid more than X. This is a good rule of thumb (like Newtonian's equations) at low X, high %I, and moderate T, because all of that serves to make the end result IX > X. Counter Examples Are there circumstances where the opposite is true? Here's a simple but contrived one: you don't pay the full timeframe. Suppose you die, declare bankruptcy, move to another country, or any other event that reduces T in such a way that XI is less than X. This actually is a big concern for older debtors or those who contract terminal illnesses, as you can't squeeze those payments out of the dead. This is basically manipulating the whole concept. Let's try a less contrived example: suppose you can get a return higher than %I. I can currently get a loan at around %3 due to good credit, but index funds in the long run tend to pay %4-%5. Taking a loan and investing it may pay off, and would be better than waiting to have the money, even in some less than ideal markets. This is basically manipulating T to deal with IX. Even less contrived and very real world, suppose you know your cash flow will increase soon; a promotion, an inheritance, a good market return. It may be better to take the loan now, enjoy whatever product you get until that cash flows in, then pay it all off at once; the enjoyment of the product will make the slight additional interest worth it. This isn't so much manipulating any part of the equation, it's just you have different goals than the loan. Home Loan Analysis For long term mortgages, X is high, usually higher than a few years pay; it would be a large burden to save that money for most people. %I is also typically fairly low; P is directly related to %I, and the bank can't afford to raise payments too much, or people will rent instead, meaning P needs to be affordable. This does not apply in very expensive areas, which is why cities are often mostly renters. T is also extremely long; usually mortgages are for 15 or 30 years, though 10 year options are available. Even with these shorter terms, it's basically the longest term loan a human will ever take. This long term means there is plenty of time for the market to have a fluctuation and raise the investments current price above the remainder of the loan and interest accrued, allowing you to sell at a profit. As well, consider the opportunity cost; while saving money for a home, you still need a place to live. This additional cost is comparable to mortgage payments, meaning X has a hidden constant; the cost of renting. Often X + R > IX, making taking a loan a better choice than saving up. Conclusion ""The general advice"" is a good heuristic for most common human payments; we have relatively long life spans compared to most common payments, and the opportunity cost of not having most goods is relatively low.  However, certain things have a high opportunity cost; if you can't talk to HR, you can't apply for jobs (phone), if you can't get to work, you can't eat (car), and if you have no where to live, it's hard to keep a job (house). For things with high opportunity costs, the interest payments are more than worth it." A few years ago I had a 5 year car loan. I wanted to prepay it after 2 years and I asked this question to the lender. I expected a reduction in the interest attached to the car loan since it didn't go the full 5 years. They basically told me I was crazy and the balance owed was the full amount of the 5 year car loan. This sounds like you either got a bad car loan (i.e. pay all the interest first before paying any principal), a crooked lender, or you were misunderstood.  Most consumer loans (both car loans and mortgages) reduce the amount of interest you pay (not the _percentage) as you pay down principal. The amount of interest of each payment is computed by multiplying the balance owed by the periodic interest rate (e.g. if your loan is at 12% annual interest you'll pay 1% of the remaining principal each month). Although that's the most common loan structure, there are others that are more complex and less friendly to the consumer. Typically those are used when credit is an issue and the lender wants to make sure they get as much interest up front as they can, and can recover the principal through a repossession or foreclosure. It sounds like you got a precomputed interest loan.  With these loans, the amount of interest you'd pay if you paid through the life of the loan is computed and added to the principal to get a total loan balance. You are required to pay back that entire amount, regardless of whether you pay early or not. You could still pay it early just to get that monkey off your back, but you may not save any interest.   You are not crazy to think that you should be able to save on interest, though, as that's how normal loans work.   Next time you need to borrow money, make sure you understand the terms of the loan (and if you don't, ask someone else to help you). Or just save up cash and don't borrow money ;) First, let me fill in the gaps on your situation, based on the numbers you've given so far. I estimate that your student loan balance (principal) is $21,600. With the variable rate loan option that you've presented, the maximum interest rate you could be charged would be 11.5%, which would bring your monthly payment up to that $382 number you gave in the comments. Your thoughts are correct about the advantage to paying this loan off sooner.  If you are planning on paying off this loan sooner, the interest rate on the variable rate loan has less opportunity to climb. One thing to be cautious of with the comparison, though: The $1200 difference between the two options is only valid if your rate does not increase.  If the rate does increase, of course, the difference would be less, or it could even go the other way.  So keep in mind that the $1200 savings is only a theoretical maximum; you won't actually see that much savings with the variable rate option. Before making a decision, you need to find out more about the terms of this variable rate loan: How often can your rate go up? What is the loan rate based on? I'm not as familiar with student loan variable rate loans, but there are other variable rate loans I am familiar with: With a typical adjustable rate home mortgage, the rate is locked for a certain number of years (perhaps 5 years).  After that, the bank might be allowed to raise the rate once every period of months (perhaps once every year).  There will be a limit to how much the rate can rise on each increase (perhaps 1.0%), and there will be a maximum rate that could be charged over the life of the loan (perhaps 12%). The interest rate on your mortgage can adjust up, inside of those parameters.  (The actual formula used to adjust will be found in the fine print of your mortgage contract.)  However, the bank knows that if they let your rate get too high above the current market rates, you will refinance to a different bank.  So the mortgage is typically structured so that it will raise your rate somewhat, but it won't usually get too far above the market rate.  If you knew ahead of time that you would have the house paid off in 5 years, or that you would be selling the house before the 5 years is over, you could confidently take the adjustable rate mortgage. Credit cards, on the other hand, also typically have variable rates.  These rates can change every month, but they are usually calculated on some formula determined ahead of time.  For example, on my credit card, the interest rate is the published Prime Rate plus 13.65%.  On my last statement, it said the rate was 17.15%.  (Of course, because I pay my balance in full each month, I don't pay any interest.  The rate could go up to 50%, for all I care.) As I said, I don't know what determines the rate on your variable rate student loan option, and I don't know what the limits are.  If it climbs up to 11.5%, that is obviously ridiculously high.  I recommend that you try to pay off this student loan as soon as you possibly can; however, if you are not planning on paying off this student loan early, you need to try to determine how likely the rate is to climb if you want to pick the variable rate option. "I am going to respond to a very thin sliver of what's going on.  Skip ahead 4 years. When buying that house, is it better to have $48K in the bank but a $48K student loan, or to have neither?  That $48K may very well be what it would take to put you over the 20% down payment threshhold thus avoiding PMI. Banks let you have a certain amount of non-mortgage debt before impacting your ability to borrow. It's the difference between the 28% for the mortgage, insurance and property tax, and the total 38% debt service.  What I offer above is a bit counter-intuitive, and I only mention it as you said the house is a priority. I'm answering as if you asked ""how do I maximize my purchasing power if I wish to buy a house in the next few years?""" "Your mortgage terms are locked in; the servicer/new owner cannot  change the terms without your consent, but the servicer can be more aggressive in taking action  (as specified in your mortgage contract) against you. For example, if the mortgage agreement calls for penalties for missing a payment or making it late, your friendly neighborhood banker might waive the penalty if the payment is received a day late once (but perhaps not the second or the third time), but the servicer doesn't know you personally and does not care; you are hit with the penalty right  away. If the payment was received a day late because of delays in the post office, too bad. If you used a bank bill payment service that ""guarantees"" on-time arrival, talk to the bank. All  perfectly legal, and what you agreed to when you signed the contract. If you can set up electronic payments of your mortgage payments, you can avoid many of these hassles. If you are sending in more money than what is due each month, you should make sure that the extra money reduces the principal amount owed; easy enough if you are sending a physical check with a coupon that has an entry line for ""Extra payment applied to principal"" on it. But, the best mortgage contracts (from the bank's point of view) are those that say that extra money sent in applies to future monthly installments. That is, if you send in more than the monthly payment one month, you can send in a reduced payment next month; the bank will gladly hold the extra amount sent in this month and apply it towards next month's payment. So, read your mortgage document (I know, I know, the fine print is incomprehensible) to see how extra money is applied. Finally, re-financing your mortgage because you don't like the servicer is a losing proposition unless you can, somehow,  ensure that your new bank will not sell your new mortgage to the same servicer or someone even worse." It's so that your total mortgage payment stays the same every month. Obviously, the interest due each month decreases over time, as part of the principal is paid off each month, and so if the proportion of interest and principal repayments were to stay the same then your first payment would be very large and your last payment would be almost nothing. "The other answers have touched on amortization, early payment, computation of interest, etc, which are all very important, but I think there's another way to understand the importance of knowing the P/I breakdown. The question mentions the loan payment as ""cash outflow"". That is true, but from an accounting perspective (disclaimer: I am not an accountant, but I know enough of the basics to be dangerous), the outflow needs to be directed to different accounts. The loan principal appears as a liability on your personal balance sheet, which you could use, for example, in determining net worth. The principal amount in your payment should be applied to reduce the liability account. The interest payment goes into the expense account.  Another way to look at it is that the principal, while it does reduce your cash account, can be thought of as an internal transfer to the liability account, thus reducing the size of the liability. The interest payment cannot. Aside: From this perspective, the value of the home is an asset, and the difference between the asset account and the loan liability account is the equity in the house (as pointed out in different language by the accepted answer). Of course, precisely determining the value of an illiquid asset like a house at any given moment pretty much requires you to actually sell it, so those accounts are hard to maintain in real-time (the liability of the loan is much easier to track)."