Most current and retired federal and postal workers have a 401k plan via the federal Thrift Savings Plan. For those under the Civil Service Retirement System, with its more generous indexed-to-inflation annuity for life, the TSP is a very nice thing to have. But in most cases, not a must. For those who are or will retire under the Federal Employees Retirement System program the TSP is a must. It is at least going to be one-third of their retirement income along with Social Security and their FERS annuity, which is not fully indexed to inflation. Over time that so-called diet cost of living adjustment formula means that normal inflation or anything over 2% will eat into their FERS annuity. A number of long-time TSP investors, though not as many as before, have account balances worth $1 million or more. Many were in the $500,000 to $750,000 category, before the “correction.” During the Great Recession thousands moved money from the stock indexed C, S and I funds into the safety of the treasury securities G fund. That money was “safe” but its growth rate compared to the rebounding stock funds, was minimal. Those who stuck with the stock funds and continued to buy — at what turned out to be bargain basement sale prices — saw their accounts prosper. Things like risk-tolerance, age and how soon after retirement you will need to tap your TSP are key factors in deciding what to do or what not to do. So, when in doubt, ask Arthur Stein. He’s a well-known financial planner with a lot of federal clients in the Washington, D.C., area. He’ll be my guest today on our Your Turn radio show at 10 a.m. EDT. Listen at www.federalnewsnetwork.com or at 1500 AM in the D.C. region. If you have questions shoot them to me before showtime at mcausey@federalnewsnetwork.com