I need help trying to figure out how to pay down my private student loan. The balance is almost $20,000.

Sadly at the time that I took the loan, the interest rate was 8.75% (I think it was actually higher at first, but then the bank dropped it to this).

The minimum payments are always low, fluctuating between $30-$100. However, after making payments for almost 1.5 years, the new balance has hardly dropped $1,000.

The strangest part about it is that I almost always make a $200 payment (first few payments were the minimum, which at the time was over $100), but the amount that goes in as interest and principal on the $200 payment is like a roller coaster. Sometimes $30 goes to the principal and then the remaining $170 goes to interest other times, $0.50 goes to principal and the rest to interest, at other times, $60 goes to principal, etc.

Can anyone explain why it fluctuates so much and why I can't make any headway on this private student loan? I want to make a $1,000 payment to the loan in an attempt to knock the balance down some, but I fear that most, if not all of it will go to interest. If I did not have to take it at the time, I would not have, but money was real tight in the family for personal reasons, but my parents made too much for me to get any federal aid for school.

1 Answer 1


If you have a 20,000 balance and a 8.75% interest rate, you should be paying between $145 and $150 in interest each month, with the balance going to principal. (0.0875/12=0.007292, and that times 20,000 is 145.83; as interest is compounded daily, it'll be a little higher than that.) If the minimum is below $145, then you are not covering the interest; I suspect that is what is happening here, and they're reporting interest paid that wasn't covered in a prior month (assuming you have some months where you only pay the statement minimum, which is less than the total accrued interest).

Assuming you're in the US (or most other western countries), your loan servicer should be explaining the exact amount each payment that goes to principal and interest. I recommend calling them up and finding out exactly why it's not consistent; what should be happening, assuming you pay more than the amount of interest each month, is the interest should go down (very) slowly each month and the amount paying off principal should go up (also slowly). EG:

January:  $146 = Interest, $54 = Principal
February: $145.9 = Interest, $54.1 = Principal
March:    $145.8 = Interest, $54.2 = Principal

Etc., until eventually the interest is zero and your loan is paid off. It probably won't go this quickly for this size of loan - you're only paying off a tiny percentage of principal each month, $50/$20000 or 1/400th - so you won't make too much headway at this rate. Even adding another $25 would make a huge difference to the length of the loan and the amount of interest paid, but that's another story.

You will eventually at this rate pay off the loan (at $200 a month for all 12 months); this isn't dissimilar to a 30 year mortgage in terms of percent interest to principal (in fact, it's better!). $50 a month times twelve is $600; 400 payments would take care of it (so a bit over 30 years). However, as you go you pay more principal and less interest, so you will actually pay it off in 15 years if you continue paying $200 a month exactly.

What you may be seeing in your case is a combination of things:

  1. In months you pay less (ie, $100, say), the extra $45 in interest needs to go somewhere. It effectively becomes part of the principal, but from what I've seen that doesn't always happen directly - ie, they account it differently at least for a short time (up to a year, in my experience). This is because of tax laws, if I understand correctly - the amount you pay in interest is tax-deductible, but not the amount of the principal - so it's important for you to have as much called 'interest' as possible. Thus, if you pay $100 this month and $200 next month, that total of $300 is paying ~$290 of interest and $10 of principal, just as if you'd paid it $150 each month.

  2. If you had any penalties, such as for late payments, those come out off the top before interest; they may sometimes take that out as well.

All in all, I strongly suggest having an enforced minimum (on your end) of the interest amount at least; that prevents you from being in a situation where your loan grows. If you can't always hit $200, that's fine; but at least hit $150 every single month. Otherwise you have a never ending cycle of student loan debt that you really don't want to be in.

Separately, on the $1000 payment: As long as you make sure it's not assigned in such a way that the lender only accepts a month's worth at a time (which shouldn't happen, but there are shady lenders), it shouldn't matter what is called 'principal' and what is called 'interest'. The interest won't go up just because you're making a separate payment (it'll go down!). The portion that goes to interest will go to paying off the amount of interest you owe from the time of your last payment, plus any accrued but unpaid interest, plus principal. You won't have the option of not paying that interest, and it doesn't really matter anyway - it's all something you owe and all accruing interest, it only really matters for accounting and taxes. Double check with your lender (on the phone AND on their website, if possible) that overpayments are not penalized and are applied to principal immediately (or within a few days anyway) and you should be fine.

  • Wow, thank you so much for the very detailed explanation! It was very informative. Also, I am in the US. The inconsistency in how much of a payment was being applied to interest and how much to principal was really bothering me. After double-checking all of my payments, I see that the first 6 months of payments were all under $200 (not even enough to cover the ~$150 in interest that you mentioned). I will be more consistent about how much I pay (at least $200/month) and see if the numbers are still iffy. At which point, I'll check with the lender to see what is going on as you suggested.
    – spguy
    Jan 6, 2015 at 21:26
  • I made a small edit, as I verified the payoff period for $200 payment is in fact 15 years exactly.
    – Joe
    Jan 6, 2015 at 22:09
  • 1
    @spguy don't wait to check with the lender after you make several more payments. Talk to the lender now and don't get off the phone until you understand everything about your loan. Joe's fantastic answer should give you a bunch of good questions to ask them. Jan 7, 2015 at 0:00
  • @MHH Thanks for the advice. I called the lender and used the info that Joe provided to ask some questions. Sadly, the rep seemed irritated by my questions, but said that there is no set amount that is applied to interest and principal; it's just what is needed to cover the accrued interest with the remaining going to the principal. Any additional payments will go straight to the principal (minus any accrued interest from the time of the last payment). My plan is to do as Joe suggested and enforce a minimum on my end. As he explained, that should eventually negate the fluctuations in time.
    – spguy
    Jan 9, 2015 at 19:06

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