Over at Bible Money Matters, there is a description of Dave Ramsey’s program to “Drive free cars”. Basically, his theory is that if you save enough money in a mutual fund at a 12% return, you can eventually have your cars be completely free. Seems like an interesting concept, but the downside of it for me is that you’ll end up driving a junker for awhile, which could very well mean expensive repairs.

Let’s take a look at how you would end up after 8 years if you purchased a car with a 5-year loan at 0% interest (which is pretty easy to get right now) and then kept making your payments into a savings account, versus Dave’s method. Read more with the link below!

Assumptions:
* Payment of $417/mo in either plan (this would buy a $25k car at 0% interest)
* Keeping saved money in a mutual fund that earns 12%
* No car repairs needed, same maintenance schedule on used car vs. new car (yeah right.)

0% Method:
* Purchase car at 0% interest for 60 months, pay a total of $25,020 over 5 years for the car.
* At the end of the 5-year period, start paying $417/mo into a mutual fund that earns 12% interest. At the end of a 3-year period (for a total of 8 years), you will have paid $15,012 into your mutual fund, and it will be worth $17,964.
* At the end of the 8-year period, you own a car that is worth around $3000, and you have $17,964 in your mutual fund. So you could trade in your car and your cash, and purchase a car for around $20,000 in cash.

Dave’s method:
* Purchase a $1668 car with cash on hand.
* Pay $417/mo for four months to “pay back” your savings for the first car. Total: $1668
* Save $417/mo for 12 months. Total paid is $5004, with interest you have $5324 in your savings account.
* Sell car for $1000 and purchase new car for $6000. You’re now 16 months into the plan, and are driving a paid-for $6000 car, and you have $324 left in your car savings account.
* Save $417/mo for 3 more years, for a total of $15008 paid and $18419 in your savings account.
* Sell your car for $2000, and purchase a $20,000 car. You have $419 left in your savings account.
* You are now 4 years and 4 months into your plan, have paid $21,680 into your savings account, and are driving a $20,000 car.
* Save $417/mo for 4 years, for a total of $20,016 paid into your savings account, and a total of $26,103 in your savings account.
* At the end of the 8-year and 4-month period, you own a car that is worth around $6000, and have $26,103 in your mutual fund. So you could trade in your car and cash, and purchase a car for around $32,000 in cash.

So it does look like Dave’s plan will get you a better car, on paper at least. However, a few things to note:
* Over a loan period this short, it can be very difficult to get a 12% return on your money.
* On the 0% plan, you start with a brand new car. On (my interpretation of) Dave’s plan, you are driving a $1500 beater for the first year, and then a $6000 car for the next 3 years. The nice thing with the new car is that you can often get a warranty that will cover the first 100,000 miles or 5 years, so you don’t run a risk of high repair bills for the period where you are still paying for the car.

Personally, I’d probably stick with the 0% new car plan, as our budget is tight, and it could be tough to keep enough money in savings for repairs if the car breaks down. What would you do?