Dear Rusty: I’m considering filing for my SS at age 64 in February, before my full retirement age of 66 years and 10 months. I’m working full time and would like to continue earning until I meet the $21,240 limit for this year. When does the $21,240 limit go into effect? Does it start after receiving my first SS benefit deposit? Or does Social Security go by my year-to-date earnings starting on January 1st?