from Office of Personnel Management
The elective deferral limit for TSP contributions for 2013 is $17,500 (which is an increase from $17,000 that existed in 2012). This means that eligible employees may make up to $17,500 of regular TSP contributions for the 2013 calendar year. Remember: traditional contributions are tax-deferred, and Roth contributions are after-tax.
If you are at least age 50 (or will become age 50 during the calendar year), and if you are making the maximum contribution into the TSP during the calendar year (i.e., $17,500 for 2013), you can make catch-up contributions to your TSP account (as much as $5,500 per year). Remember: Catch-up contributions must be elected each year. You can find more information about TSP
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