With a Flexible Savings Account, I Can Access 100% of my Annual Contribution on Day 1. Is That the Same as an HSA?

A medical or health savings account is different than a flexible savings account, you can only access the money in an HSA when it is available in your account.

For example, if you had $50/month contribution to your HSA account from your employer and a $100 expense in the first month, you would only be able to access the $50 in your account to pay towards the $100. If you were planning on making an individual contribution to your HSA account, you could make an HSA contribution to pay the entire $100 with HSA eligible funds.