Taxpayers May Contribute up to $18,000 to their 401(k) plans in 2015 IR-2014-99, Oct. 23, 2014 WASHINGTON — The Internal Revenue Service today announced cost‑of‑living adjustments affecting dollar limitations for pension plans and other retirement-related items for tax year 2015. Many of the pension plan limitations will change for 2015 because the increase in the cost-of-living index met the statutory thresholds that trigger their adjustment. However, other limitations will remain unchanged because the increase in the index did not meet the statutory thresholds that trigger their adjustment. Highlights include the following: · The elective deferral (contribution) limit for employees who participate in 401(k) , 403(b), most 457 plans, and the federal government’s Thrift Savings Plan is increased from $17,500 to $18,000 . · The catch-up contribution limit for employees aged 50 and over who participate in 401(k) , 403(b), most 457 plans, and the federal government’s Thr...