I’m just going to say it. If you have thousands of dollars sitting in cash inside your HSA earning basically nothing, you are misusing one of the most powerful financial tools available to you. It’s ALMOST as bad as people letting cash sit idly in their Roth IRAs.

These accounts exist for tax-advantaged growth. 

If there’s no growth, you’re defeating the entire purpose. Continue reading to get an HSA best practices lesson that has been the topic of a lot of client reviews these days.

First: Do You Even Have Access to an HSA?

You can only use an HSA if you’re enrolled in a High Deductible Health Plan (HDHP) and don’t have other disqualifying coverage (like a non-HDHP plan that also covers you, Medicare enrollment, or being claimed as a dependent).

Eligibility is tied to the type of coverage:

  • Self-only HDHP → You can contribute at the individual limit.
  • Family HDHP (you + spouse and/or dependents) → The family limit applies to the whole household, not per person. If both spouses are eligible, that family limit is shared between their HSAs

Note: If you’re on an HDHP but your spouse’s PPO also covers you, you’re not HSA-eligible. If their PPO covers only them and you’re covered solely under your own HDHP, you can still contribute.

2026 Contribution Limits:

  • Individual: $4,300
  • Family: $8,550
  • Age 55+: Extra $1,000 catch-up per eligible person

If your plan materials say “HSA-eligible” or “HDHP,” that’s your green light to (do your best to) max out your HSA on an annual basis.

Why I Get Fired Up About HSAs

This is the only account most people will ever have that offers a triple tax benefit:

  1. Contributions are tax-deductible (or pre-tax via payroll)
  2. Growth is tax-deferred (no capital gains tax)
  3. Withdrawals are tax-free when used for qualified medical expenses

That combination is absurdly powerful…

Your 401(k)? Tax-deferred.

Your Roth IRA? Tax-free later, but funded with after-tax dollars.

Your brokerage account? Taxed along the way.

Your HSA? Tax break on the way in, no taxes while it grows, no taxes when it comes out (if used correctly).

That’s elite-tier tax treatment…and people are letting it sit in cash. Shame!

Who Should Seriously Consider an HDHP + HSA

An HDHP isn’t right for everyone. But it tends to fit well for:

  • Healthy individuals or families with low to moderate routine medical use
  • Higher-income households who can comfortably cover a deductible if needed
  • Strong savers who can fund the HSA and leave it alone
  • Investors who think long-term, not just this year’s bills
  • People already maxing other savings and looking for the next best tax bucket

If you’re living paycheck to paycheck or one ER visit would financially wreck you, an HDHP might not be the right call. But for many disciplined savers, it’s a very efficient structure.

How to Unlock an HSA’s Full Potential (Best Practices, Not Rules)

Most people treat an HSA like a checking account for co-pays, and honestly, that’s not really your fault. HSA providers hand you a debit card, set the default to cash, and do almost nothing to educate you on the investing options or long-term strategies available. People naturally assume it’s just a pass-through spending account.

That’s the basic / default way these accounts get used.

If you want to use your HSA more like a long-term wealth tool than a medical checking account, here’s the more optimized playbook:

1. Keep a Cash Threshold

  • Hold a reasonable amount in cash inside the HSA to cover near-term medical costs. Many HSA providers let you set this up automatically by keeping the first $1,000–$2,000 in cash and sweeping anything above that into investments.

2. Invest the Rest

  • Everything above that cash cushion should be invested for long-term growth, just like a retirement account. Low cost index funds or target date funds are optimal.

3. Pay Medical Costs Out of Pocket (If You Can)

Instead of swiping the HSA card every time:

  • Pay with your regular cash or credit card
  • Earn points, miles, or rewards
  • Let your HSA stay invested and growing

4. Save Every Receipt

There is no deadline to reimburse yourself for qualified medical expenses, as long as:

  • The expense occurred after the HSA was established
  • You kept proper documentation (records showing the expense, date, amount, and that it wasn’t reimbursed elsewhere)

That means you can pay a bill today, let your HSA grow for years, then reimburse yourself tax-free in the future.

Done consistently, your HSA effectively becomes a tax-free emergency fund backed by saved medical receipts.

If you’re unsure whether something qualifies, you can check IRS Publication 502 (Medical and Dental Expenses) or your HSA custodian’s list of eligible expenses, which is usually based directly on IRS guidance.

If the IRS ever asks, you need documentation. “I think it was medical” is not a strategy.

“What If I Overfund My HSA?” (Spoiler: That’s Not a Bad Problem)

One fear people have is putting too much into their HSA and not using it all on current medical bills. That’s not really a concern.

First, medical expenses tend to rise as we age, not fall. Future you is very likely to have more opportunities to use those dollars than present-day you.

Second, after age 65:

  • You can still use HSA money tax-free for qualified medical expenses (including many Medicare-related costs).
  • If you withdraw funds for non-medical reasons, it’s simply taxed like a traditional IRA, with no penalty.

So worst case, your HSA behaves like another retirement account. Best case, it remains a tax-free medical war chest during the most medically expensive phase of life.

The Bigger Point

We preach that our job as financial planners is to help people align their money with what matters most. Health is not a side category. It’s core infrastructure for your life.

If your HSA is just sitting in cash, that’s not a strategy. That’s inertia, and inertia is expensive. If you’re not sure whether your plan is HSA-eligible, you’re investing it properly, or you’re using it efficiently, that’s a conversation worth having.