How do I max out my HSA before Medicare?

Why do I push every eligible client to max the HSA right up to Medicare? Because it’s the only account in the tax code that’s tax-free three times over: deductible going in, growing untaxed, and tax-free coming out for medical costs. There’s no second account like it, and the day you enroll in Medicare you can’t contribute another dollar.

The 2026 numbers

If you’re covered by a qualifying high-deductible health plan, here’s the ceiling for 2026:

• Self-only coverage: $4,400.
• Family coverage: $8,750.
• Age-55 catch-up: an extra $1,000 (fixed by law, it doesn’t grow with inflation).

So a 58-year-old couple on a family plan can put away $9,750 in 2026, every dollar deductible. Fund it, invest it, and try not to spend it.

Treat it as a retirement account, not a checking account

Most people use the HSA like a medical debit card, paying this year’s doctor bills straight out of it. The more powerful move, if you can swing it, is to pay current medical costs from cash and let the HSA invest and compound for decades. The reason is a quirk worth knowing: the IRS lets you reimburse yourself later for any qualified expense, with no deadline. Keep the receipts. You can pull that money out tax-free in your 70s against a colonoscopy you paid for in your 50s. That turns the HSA into a stealth Roth with a medical wrapper.

The Medicare cliff

Here’s the deadline that makes the pre-Medicare years matter. Once you enroll in Medicare, HSA contributions stop, and Medicare enrollment can reach back six months when you claim Social Security after 65. So the last clean year to contribute is often earlier than people assume. Front-load it. The HSA-to-Roth strategy before Medicare and the rules in HSA after Medicare enrollment cover the handoff.

The part most people miss

The hidden value isn’t this year’s deduction, it’s what the account becomes. An HSA you leave alone for 15 years is tax-free money aimed at the one expense guaranteed to rise in retirement: healthcare. It also sidesteps the problem that haunts large traditional balances, because it never feeds your RMDs or pushes your income into a higher IRMAA tier the way a 401(k) withdrawal does.

If your accounts are large

When you’ve already got millions saved, the HSA looks too small to bother with, and that’s a mistake. The dollars are modest but they’re the highest-quality dollars you can create: triple-tax-free, never subject to forced withdrawals, perfectly matched to a cost you’ll absolutely incur. I’d max it every eligible year and never touch it. One catch worth flagging: an HSA left to a non-spouse heir loses its tax shelter and becomes fully taxable to them, so it’s a spend-it-yourself account, not a legacy one. Fill it now, invest it, hold the receipts, and let it become the cleanest healthcare fund you’ll ever own.