While self-employment has many rewards, one of the concerns of this population includes investing in retirement plans. While entrepreneurs are doing what they love and getting paid for it, they must deal with many financial challenges that don't come with traditional employment, including planning for retirement. According to a study by TD Ameritrade, 70% of self-employed individuals aren't saving for retirement. Out of roughly 10 million entrepreneurs and private contractors currently working, seven million adults are not planning their financial futures. While some view saving for retirement as a lost cause when it comes to being self-employed, it is still possible to put away money for the golden years. Retirement plans for self-employed business owners and contractors can include a number of investment opportunities. The two most popular investment strategies for the self-employed are a SOLO 401k and a Simplified Employee Pension (SEP). Consider these questions when researching retirement plans for self-employed business owners and contractors.