Few of us will reach the maximum $17,500 that employees can stash in a 401(k), but any amount you can contribute is good. If you are age 50 or older, you can put in an extra $5,500.
In most cases, you can modify your 401(k) contributions at any time, but double check with your benefits office to be sure of your plan's rules.
3. Review your FSA amounts
Another workplace benefit, the medical flexible spending account, or FSA, also requires year-end attention so you don't waste it. You can contribute up to $2,500 to an FSA via paycheck withdrawals. If that limit seems lower, you're right. As part of the Affordable Care Act the maximum contribution amount was set at $2,500; before the health care law change there was no statutory limit.
As with 401(k) plans, money goes into an FSA before your taxes are calculated, saving you some tax dollars. But if you leave any money in your FSA, you lose it. Some companies allow a grace period into the next year to use the untouched FSA funds, but not all. And though the U.S. Treasury recently announced a change in the use-it-or-lose-it rule, allowing account holders to carry over up to $500 in excess money into the next benefit year, your company has to take steps to adopt it.
Be sure to check with your employer, and if you must use your FSA money by Dec. 31, make sure you do.