HSAs Sound Great – Until You See These 3 Hidden Costs

3. The “Cash Drag” and Fee Erosion

When you invest in a 401(k), you typically put 100% of your money to work in the market immediately. HSAs rarely work this way. Many HSA providers act more like banks than brokerages, and they structure their accounts to ensure they make money on your deposits.

The Mandatory Cash Minimum

Many HSA administrators require you to keep a minimum balance in a low-interest cash account before you are allowed to invest a penny. This threshold is often $1,000 or $2,000.

This is known as “cash drag.” If you have a $3,000 balance and a $2,000 cash minimum, only $1,000 is actually working for you in the market. The other $2,000 is likely earning less than 0.5% interest, losing value to inflation every single year.

The Layered Fees

In addition to cash drag, watch out for these common fees that eat away at small balances:

• Monthly Maintenance Fees: Often $2.00–$5.00 per month (sometimes waived if you hold a large cash balance, which hurts your returns anyway).
• Investment Fees: Some providers charge an extra monthly fee just for the privilege of accessing mutual funds.
• Paper Statement Fees: An avoidable but annoying cost often charged by default.

The Fix: Shop around. Providers like Fidelity and Lively have moved the market by offering HSAs with no account minimums, no cash drag (you can invest the very first dollar), and zero maintenance fees. Do not settle for your employer’s default provider if their fees are high; you can often open your own secondary HSA and transfer funds into it.