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Additional principal payments vs. additional investing

Dr. Don TaylorDear Dr. Don,
I have reviewed my budget and have an extra $200 a month this year to put toward something. I'm two years into a 30-year fixed-rate mortgage at 6 percent and two years into a five-year car loan at 3 percent. I have no other debt. The question is should I increase my 401(k) contributions above the 7 percent of salary I am currently contributing (no company match), pay down my mortgage or pay down my car? Thanks.
-- Donna Dilemma

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Dear Donna,
It's great you have money left over at the end of the month. Putting that money to work by either paying down debt or investing for future life goals like retirement is a great idea. Which approach is better depends a lot on you.

You haven't told me your age or your income so I don't know how close you are to retirement or what 7 percent of salary means as an annual contribution to your retirement account.

What's key here is the expected after-tax returns on your investments vs. the effective interest rate on your debt. If you deduct mortgage interest expense on your taxes then the effective interest rate on your mortgage is less than the 6 percent rate used to calculate your monthly payment. If you're in the 25 percent marginal federal income tax bracket that means that the effective rate on your mortgage is 4.5 percent. Being able to deduct the interest expense on your state taxes brings the effective rate even lower. Since you can't deduct the interest expense on your car loan the effective rate is the 3 percent loan rate.

Choosing between making additional principal payments on the car or the mortgage, I'd choose the mortgage because of the higher effective rate and the longer loan term. You can use Bankrate's Mortgage Calculator to determine the interest savings and reduction in loan term on the mortgage or the car loan. I did in the example below. You can use the example as a template for your own table with your actual loan balances.

  Mortgage Loan Car Loan
Loan balance:
$150,000
$15,000
Remaining loan term (months):
336
36
Interest rate:
6%
3%
Loan payment:
$922.69
$436.22
Total payments:
$310,023
$15,704
Total interest expense:
$160,023
$704
 
With additional principal payment of:
$200
$ 200
Remaining loan term (months):
222
25
Total payments:
$248,226
$15,479
Total interest expense:
$98,226
$479
Interest savings:
$61,797
$225

Making additional principal payments on your house for almost two decades will obviously save you a lot more money than making additional principal payments on your car over the next two years, but before you get too carried away with the idea of making additional principal payments make sure there's no prepayment penalty on the loan.

The decision isn't always about comparing what you can earn in investment returns vs. your effective interest rate on your loans. If you don't have an emergency fund with liquid funds equal to three to six months' worth of living expenses, then that's where you should start putting this money.

With no company match in your 401(k) plan, you may be better off in the long run to contribute to a Roth IRA. While the 401(k) defers taxes on contributions and investment earnings until they are withdrawn as qualified distributions from the account, the Roth IRA is funded with after-tax dollars, but the investment earnings are free of federal taxation. Talk to your tax professional about whether you should be contributing to a Roth IRA as part of your retirement savings plan.

If you're more than 10 years from your planned retirement date, I'd much rather see you investing toward your future financial goals than prepaying the mortgage or car loan. Over a longer investment horizon, you shouldn't have any problem earning more than the effective rate of interest on your loans. If you're putting the money to work in a 2-percent certificate of deposit, then that's a different matter.

 

 
-- Posted: Jan 25, 2005
     

 

 
 

 

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