No retirement benefits: Another big disadvantage of having a part time job is that most often part time jobs offer no retirement benefits. No matter how many years while working part time you have given your dedicated service, it is unlikely that you will receive any retirement benefits. In order to enjoy a happy retired life it is important to make sure that you have some money saved so that in your old age you do not have financial troubles. It is incredibly heart wrenching to see old people working tirelessly to earn a little money in order to make ends meet. Full time jobs are beneficial in the manner in which they offer a number of retirement benefits which ensure that they continue to have a high standard of living even when you are old and unable to work.