Effective in 2006, civilian and military employees may contribute the full amount to their Thrift Savings Plan (TSP) accounts that is allowed by the Internal Revenue Service ($15,000 for 2006). They may start, change, stop or resume their TSP contributions at any time (except those in the 6-month non-contribution period following a financial hardship in-service withdrawal). Service members also may invest all or part of their bonuses, special pay or incentive pay, as long as they contribute from basic pay. Those serving in tax-free combat zones are allowed up to $44,000 in annual contributions. Military participants can enroll or change their contribution amount at https://mypay.dfas.mil/mypay.aspx, or by filling out a form TSP-U-1 at local finance offices. They can change contribution allocations by calling 1 (877) 968-3778 from the 50 States, Virgin Islands, Puerto Rico, Guam, American Samoa and Canada; calling 1 (404) 233-4400 from elsewhere, or visiting www.tsp.gov.