In 2025, individual can contribute up to $4,300 if you are covered by a high-deductible health plan just for yourself, or $8,550 if you have coverage for your family. At age 55, individuals can contribute an additional $1,000.
https://www.fidelity.com/learning-center/smart-money/hsa-contribution-limits
這個完全是雇員自主決定的。但是,雇主也可以給雇員設立HSA賬戶並向裏注資。這樣相當於給雇員的一點福利。對小業主來說麻煩,還不如當獎金直接發了。