This page was updated on June 1, 2017.

Loan interest rate for new loans is 2.250%.
Elective Deferral Limit (I.R.C. Section 402(g)): The elective deferral limit for 2016 and 2017 is $18,000. See the Fact Sheet  Annual Limit on Elective Deferrals.
I.R.C. Section 415(c) Limit:  The limit was $53,000 for 2016 and $54,000 for 2017. 
Catch-Up Contributions: The limit on catch-up contributions for 2016 and 2017 is $6,000. If you are at least age 50 (or will become age 50 during the calendar year) and if you have made or will make the maximum amount of employee contributions for the calendar year (e.g. $18,000 for 2016 and 2017), you may also make catch-up contributions to your TSP account. See the Fact Sheet " Catch-Up Contributions."
Annuity interest rate index: 2.250% for annuities purchased in June 2017 and 2.375% for annuities purchased in May 2017. You can also view historical annuity interest rates.
Your account balance is updated each business day. To access your account balance on this web site, you will need your TSP account number (or custom user ID) and your Web password. To obtain your account balance from the ThriftLine, you will need your TSP account number and 4-digit TSP Personal Identification Number (PIN).