Health Savings Account, is similar to a personal savings account but helps with out-of pockets health care expenses. To become eligible for a HSA you must have a high deductible health plan (HDHP). With this plan the premiums are significantly lower. When you have money set aside for medical expenses, that means when you have a medical expense it is taken out of the HSA not your household funds. The money taken out of your paycheck for your HSA is tax free.  You control how much money you want to set aside to the maximum amount set by the IRS. No matter if you change jobs or if you do not use all of the saved money it stays with you. You can withdraw money for non medical expenses, however you will have to pay taxes on the money and a 20% penalty.