It’s official: Come 2018, working Americans will have an even greater opportunity to set aside money for the future. That’s because the IRS just announced an increase to the annual contribution limits for 401(k) plans. Though the current annual limit, effective through the end of 2017, is $18,000 for workers under 50, employees starting next year will have the option to contribute an extra $500, for a total of $18,500.