In most cases, you’ll use your agency’s or service’s electronic payroll system to start, change, or stop your TSP contributions. For example, civilian payroll systems include Employee Express, EBIS, LiteBlue, myPay, or NFC EPP. Uniformed services can use myPay (Army, Air Force, Navy, Marine Corps) or Direct Access (Coast Guard and NOAA Corps).

If your agency or service accepts the paper form, download and complete the Form TSP-1, Election Form (or Form TSP-U-1 for uniformed services members), or call the ThriftLine at 1-877-968-3778 and choose option 3 to have it mailed to you.