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How much should I be contributing to my 401k given my employer's contribution?
You can only contribute up to 5% of your salary? Odd. Usually 401(k) contributions are limited to some dollar amount in the vicinity of $15,000 or so a year. Normal retirement guidelines suggest that putting away 10-15% of your salary is enough that you probably won't need to worry much when you retire. 5% isn't likely to be enough, employer match or no. I'd try to contribute 10-15% of my salary. I think you're reading the rules wrong. I'm almost certain. It's definitely worth checking. If you're not, you should seriously consider supplementing this saving with a Roth IRA or just an after-tax account.  So. If you're with Fidelity and don't know what to do, look for a target date fund with a date near your retirement (e.g. Target Retirement 2040) and put 100% in there until you have a better idea of what going on. All Fidelity funds have pretty miserable expense ratios, even their token S&P500 index fund from another provider, so you might as let them do some leg work and pick your asset allocation for you. Alternatively, look for the Fidelity retirement planner tools on their website to suggest an asset allocation. As a (very rough) rule of thumb, as you're saving for retirement you'll want to have N% of your portfolio in bonds and the rest in stocks, where N is your age in years. Your stocks should probably be split about 70% US and 30% rest-of-world, give or take, and your US stocks should be split about 64% large-cap, 28% mid-cap and 8% small-cap (that's basically how the US stock market is split).