If you can't put in 5% right away, put in 1%. That may not seem like much, but you will get matched to 2%, which will grow from earnings tax-free. The next year, if you get at least a 1% raise (which is about what they are running lately), you can add that 1% and not miss it because you didn't have it in your hands in the first place. So, 2% gets matched to 4%. The next year, 3% gets matched to 6%. The next year, 4% gets matched to 8%. Finally, at the fifth year, your 5% gets matched to 10%, using money you almost didn't miss, because it mostly came from raises. There is an option at the 401(k) web site to auto-increment each year by a certain percentage you set, up to a limit you set, so this step-up can even be done automatically.