We have a 403b situation, where, if we put in 5%, my employer puts in 10%…so not only is it missing out on the free money from a 1:1 match, it’s missing out on that extra 5%. The benefits of it, including the tax advantage now, outweigh the interest we may pay on other things. Others may disagree, but it’s the one thing we are doing that I’m not sure whether it follows Dave exactly, but we’ve decided not to ignore that 10% of my salary every year….
You want to contribute at least enough to maximize the match. For example if the company will match 6% of your contributions you want to contribute 6%. You also want to check to make sure how often you are allowed to make changes to your deferrals. Some plans only allow changes quarterly, semi-annually or annually. Here is a link for a take home pay calculator to help you determine how your paycheck will be affected.