For the fourth year in a row we've calculated the required percentage of your military pay to max out your TSP. Here's the link.
Here's how you use it. In this example, a Major (O-4) with more than 18 years of service would
go to MyPay.gov, select the TSP link, and select 20% as their monthly
Similarly, a Lieutenant Colonel with 16 years of
service would contribute 18% of their base pay to max out their TSP
for the year.
The contribution limit for 2013 is $17,500 for those under 50, and an additional $5,500 for older military members.