Healthcare is the largest uninsured expense in retirement. Medicare covers significant costs but leaves substantial gaps: premiums, deductibles, copayments, dental, vision, hearing, and long-term care. A client who retires without a plan for funding those gaps is going to cover them from taxable retirement income, which makes the coordination question more consequential than it might appear.
The HSA is the only retirement savings vehicle that offers a deduction on contributions, tax-free growth, and tax-free distributions for qualified medical expenses. For practitioners helping clients plan retirement income, the question isn’t whether the HSA belongs in the picture. For practitioners helping clients build an HSA retirement healthcare strategy, the question isn’t whether the account belongs in the picture — it’s how it fits alongside Social Security timing, RMDs, and Medicare income-based premium adjustments.
What the HSA Covers After 65 That Medicare Doesn’t
Traditional Medicare, Parts A and B, covers hospitalizations, physician visits, and most medically necessary services. It doesn’t cover dental care, vision care, hearing aids, or most long-term care services. These are among the most common and costly out-of-pocket expenses retirees face, and they qualify as medical expenses for HSA purposes under IRS Publication 969 and the broader definition in Publication 502.
Medicare premiums are also HSA-eligible after age 65. Part B premiums, Part D prescription drug premiums, and Medicare Advantage premiums are all qualified medical expenses for HSA distribution purposes once the account holder reaches 65. Medigap supplemental policy premiums are the exception. Per IRS Publication 969, they’re not qualified expenses regardless of age.
Long-term care insurance premiums are qualified HSA expenses subject to age-based limits that adjust annually, per the Instructions for Schedule A. For clients who carry long-term care coverage, the HSA can fund those premiums on a tax-free basis within the applicable limits.
How an HSA Retirement Healthcare Strategy Fits the Income Stack
The retirement income picture for most clients includes some combination of Social Security, traditional IRA or 401(k) distributions, Roth accounts, taxable investment accounts, and pension income where available. Each source has different tax treatment, and the sequencing of withdrawals from each affects total tax burden, Medicare premium costs, and estate outcomes.
HSA distributions for qualified medical expenses are tax-free and are not included in modified adjusted gross income. That exclusion from MAGI matters because Medicare Part B and Part D premiums are subject to Income-Related Monthly Adjustment Amounts based on MAGI from two years prior. A client who covers medical expenses from the HSA rather than from taxable accounts or traditional IRA distributions keeps those costs out of the MAGI calculation and potentially avoids IRMAA surcharges.
The tax treatment of the source matters as much as the expense itself.
For clients near IRMAA thresholds, the difference between covering a significant medical expense from a traditional IRA versus an HSA can be the difference between staying in a lower premium bracket and crossing into a higher one. That threshold effect is worth modeling explicitly when advising clients who are approaching Medicare eligibility or already enrolled.
Sequencing HSA Withdrawals Against Other Accounts
A general sequencing principle for retirement distributions runs: taxable accounts first, then tax-deferred accounts, then Roth accounts last. The HSA complicates that framework because it functions as both a tax-free medical account and a traditional IRA equivalent for non-medical expenses after 65.
For medical expenses specifically, HSA distributions are strictly better than any other source: tax-free versus taxable from a traditional IRA, and without the income inclusion that comes with Roth conversions or other planning strategies. The sequencing implication is that qualified medical expenses in retirement are ideally covered from the HSA first, preserving other accounts for non-medical needs.
Required minimum distributions add a complicating layer. Clients with significant traditional IRA or 401(k) balances begin taking RMDs at age 73 under current law. Those distributions increase taxable income regardless of whether the client needs the funds. Using HSA distributions for medical expenses in RMD years keeps those costs off the taxable income calculation, which can matter for IRMAA calculations, Medicare premium levels, and Social Security benefit taxation.
What Qualified Expenses Are Clients Most Often Missing?
The definition of qualified medical expenses for HSA purposes runs through IRC section 213(d) and IRS Publication 502, not through what Medicare covers. Several categories of expense that fall outside Medicare coverage are fully HSA-eligible and represent genuine planning value for retirees.
Dental care is the largest gap. Medicare provides limited dental coverage, but dental procedures including dentures, extractions, implants, and routine cleaning qualify under Publication 502. Hearing aids and related maintenance costs are another category that Medicare doesn’t cover but HSAs can fund tax-free. Vision expenses including eyeglasses, contact lenses, and laser correction qualify. Costs for in-home care and certain home health aide services for a chronically ill individual qualify under specific conditions.
Most clients underestimate how much of retirement healthcare falls outside Medicare.
For advisors helping clients estimate lifetime healthcare spending in retirement, the gap between what Medicare covers and what retirees actually pay out of pocket is the figure that drives HSA adequacy modeling. A client with a substantial HSA balance who understands which expenses qualify is positioned to use that balance far more efficiently than one who treats the HSA as a general reserve.
Deferred Reimbursement: How It Works in Practice
Deferred reimbursement is one of the most underused components of a long-term HSA retirement healthcare strategy — and it depends entirely on documentation. IRS Publication 969 imposes no deadline on HSA distributions for qualified medical expenses, provided the expense was incurred after the HSA was established and the account holder maintains adequate documentation. A retiree who paid out of pocket for qualified medical expenses during accumulation years can draw tax-free from the HSA in retirement against those prior expenses, as long as receipts exist.
For clients who accumulated HSA balances while paying medical costs out of pocket during working years, this creates a documented pool of reimbursable expenses that can be drawn in retirement as tax-free income. The mechanism is straightforward and the tax benefit is meaningful, but it depends entirely on documentation. Without receipts, the deferred reimbursement strategy has no basis.
Practitioners advising clients on this strategy are reinforcing a recordkeeping discipline during the accumulation phase, not just at retirement. The receipts kept today are the mechanism for tax-free income later.
Coordinating HSA Strategy With Medicare Enrollment
HSA contribution eligibility ends the month Medicare enrollment begins. Part A enrollment alone eliminates eligibility, which catches clients who sign up for Medicare Part A before they stop working. Medicare Part A can also be backdated up to six months, which converts contributions made during the retroactive period into excess contributions subject to income tax and a 6% excise tax.
After Medicare enrollment, the HSA balance remains fully available for qualified distributions. The contribution window is closed, but the account itself is permanent. For clients approaching Medicare eligibility with significant HSA balances, the transition from contribution to distribution mode is the planning inflection point. Distributions for Medicare premiums and qualified medical expenses remain tax-free indefinitely. Non-medical distributions after age 65 are taxable but not penalized.
Maximizing Health Savings Accounts for Retirement Planning (MHS2) from Surgent CPE covers HSA retirement planning in depth, including qualified expense rules, withdrawal sequencing, Medicare coordination, IRMAA interactions, and how to help clients model HSA adequacy against projected retirement healthcare costs. Details at surgentcpe.com/cpe-courses/MHS2.
Sources: IRS Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans (2025), irs.gov/publications/p969; IRS Publication 502, Medical and Dental Expenses, irs.gov/publications/p502.