Understanding How FSA Works with HSA: A Comprehensive Guide

When it comes to managing healthcare expenses, understanding how a Flexible Spending Account (FSA) works in conjunction with a Health Savings Account (HSA) can be beneficial. Both FSAs and HSAs are tools that help individuals save money on qualified medical expenses, but they have key differences in their features and eligibility criteria.

Here's a breakdown of how an FSA works with an HSA:

  • FSAs are accounts set up by employers where employees can contribute pre-tax dollars to use for eligible medical expenses within the plan year.
  • HSAs are individual accounts that require a high deductible health plan (HDHP) and allow individuals to contribute pre-tax dollars for medical expenses.
  • An individual can have both an FSA and an HSA at the same time, but there are restrictions on using both accounts for the same expenses.
  • If you have an FSA and an HSA, you can typically use your FSA funds for dental and vision expenses while saving your HSA funds for other medical costs.
  • Unused FSA funds may not roll over to the next year, but HSA funds can be carried over indefinitely.

Understanding the nuances of how FSAs work with HSAs can help you maximize your healthcare savings and make informed decisions about your medical expenses.


When navigating the complexities of healthcare expenses, it's essential to grasp how a Flexible Spending Account (FSA) interacts with a Health Savings Account (HSA). Both FSAs and HSAs serve as invaluable financial tools, designed to help individuals and families save on qualified medical expenses while offering distinct features and rules.

Here's a detailed dive into how FSAs complement HSAs:

  • FSAs are typically employer-sponsored accounts enabling employees to allocate pre-tax earnings toward eligible medical costs throughout the plan year, creating immediate tax savings.
  • Conversely, HSAs are individual accounts linked to high deductible health plans (HDHP), which allow account holders to set aside pre-tax money for a wider range of medical expenses, often leading to long-term savings.
  • It is possible to simultaneously maintain both an FSA and an HSA, though regulations prevent you from utilizing both accounts for the same healthcare costs.
  • For those optimizing their benefits, FSA funds can often be used for dental and vision care, whilst preserving HSA funds for more extensive medical expenditures down the line.
  • A notable distinction is that FSA funds are generally subject to a 'use-it-or-lose-it' policy by the end of the plan year, while HSA funds can be rolled over indefinitely, granting users increased flexibility in managing their healthcare finances.

By understanding the interplay between FSAs and HSAs, individuals can strategically navigate their healthcare costs and maximize their savings potential over time.

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