What are the advantages of an HSA? The following is taken from a Department Of Treasury brochure on HSAs. The brochure, along with much more information, can be found at U.S. Treasury - Health Savings Accounts.

Affordability - A higher deductible reduces your health insurance premiums
Flexibility - You can use your HSA funds for current medical expenses or let them grow for future needs
Savings - You can use the HSA to save money for future medical needs and invest and grow the funds within the account in any manner you like
Control - You make all the decisions about how much money to put into the account, where the account is held, what to invest the funds in for growth, and which medical expenses to pay from the account
Portability - You keep your HSA if you change jobs, change health insurance, become unemployed, move to another state, or change your marital status
Ownership - Funds remain in the account until you take them out; there are no "use it or lose it" rules
Tax Savings - (1) Your contributions to the HSA (up to the allowable limits) are tax deductible; (2) Interest or investment earnings on the funds in your HSA are tax free; (3) Amounts you withdraw to pay for "qualified medical expenses" do not create a taxable event (withdrawals for other purposes are taxed as income and a 10% penalty is applied - the 10% penalty no longer applies at age 65)

"Qualified Medical Expenses" include much more than just your insurance deductibles. They include most medical care and services as well as dental care, vision care, and over the counter drugs. They also include medical expenses for your spouse and dependent children even if they are not covered by your health insurance plan.