My 401(K) plan lets me takes out loans against it, and I have to say paying yourself back at a low APR beats the hell out of paying pretty much anyone else back at a probably higher APR.
The money appears to be cheap to borrow, but there's some additional costs that people don't think of. Often times, the only contributions that can be made are loan repayments. So not only did you take a percentage of your capital out, you're not adding to the balance only bringing yourself back to even. The potential investment return lost often outweighs the low interest on the loan.
Great points. There's also the fact that you take out pre-tax dollars but you have to repay it with dollars that you've paid tax on.
So, say you borrow X dollars. To repay it you have to earn X + Income tax on X. So, you're losing the income tax part. You then have to pay income tax on it again when you withdraw it upon retirement. You pay double the income tax on what you borrow.
Normally you just pay income tax upon the withdrawal during retirement.
Mr Awe