Most retirement calculators bury healthcare in a single “assume 5% of expenses” line. Reality is far more complex and comes in three distinct phases — each with different cost structures, risks, and optimization levers.
Phase 1 — The pre-Medicare bridge (ages 60-64). If you retire before 65, you're responsible for your own coverage until Medicare starts. Unsubsidized ACA premiums for a 60-year-old run $700-1100/month. With a spouse, double it. With kids on the plan, more. The good news: ACA subsidies dramatically reduce this if your MAGI is below ~400% of the federal poverty line (~$60K single, $80K married for 2026; expanded by IRA through 2025+ extensions). The catch: you have to actively manage MAGI in those years — which constrains Roth conversion timing, capital gains realization, and IRA withdrawal patterns.
Phase 2 — Medicare (ages 65+). Medicare isn't free. Part A is usually premium-free if you paid in for 40+ quarters, but Part B runs $202.90/month (2026), Part D averages $46.50/month, and either Medigap ($150-300/month) or Medicare Advantage (often $0 premium, but with copays, networks, and out-of-pocket risk). Total: $4K-$8K/year per person base. Add IRMAA surcharges if your MAGI exceeds $109K single /$218K married — up to another $5K/year per person at the top tier.
Phase 3 — Long-term care (typically 80+). This is the real risk most plans ignore. About 70% of people aged 65+ will need some form of LTC in their lifetime. The average duration is 3 years. Costs run $69K (assisted living) to $116K (private nursing home) per year. Medicare does NOT cover long-term care. Medicaid only covers it after you've spent down to near-zero assets. The two real options: self-insure (set aside $200K-$500K), or buy long-term care insurance ($2K-$8K/yr premium, increasingly hard to get and increasingly expensive). Hybrid life-insurance-with-LTC-rider policies are growing in popularity as a third path.
The HSA is the unsung hero. Health Savings Accounts have a triple tax advantage that no other account matches: contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. After 65 you can also use HSA money for non-medical purposes at ordinary income rates (like a Traditional IRA). Most importantly, you can use HSA dollars to pay Medicare Part B and D premiums tax- free. A maxed-out HSA from age 30 to 65 can cover most or all of your retirement healthcare costs. Almost no one does this — most people spend down their HSA every year to cover current medical bills, completely missing the triple advantage.