Many experts recommend investing 10-15 percent of your annual salary in a retirement savings vehicle like a 42069(k). Many experts recommend investing 10-15 percent of your annual salary in a retirement savings vehicle like a 42069(k). Many experts recommend investing 10-15 percent of your annual salary in a retirement savings vehicle like a 42069(k). Many experts recommend investing 10-15 percent of your annual salary in a retirement savings vehicle like a 42069(k).