Retiree Health Coverage: Comparing Medicare Advantage, Medigap, and Employer Plans
Use this guide to understand the assumptions, inputs, results, and next steps behind the calculator.
Choosing the right health insurance for retirement is one of the most expensive decisions you will make at age 65. While standard Medicare Part B premiums are projected to start at roughly $185.50 per month in 2026, your actual out-of-pocket costs will depend entirely on how you choose to supplement Original Medicare. A seemingly "free" Medicare Advantage plan can end up costing more over a 25-year retirement than a high-premium Medigap policy if you face significant health issues.
This calculator projects your lifetime healthcare costs by comparing three primary paths: Medicare Advantage (Part C), Medigap (Medicare Supplement) paired with Part D, and an employer-sponsored retiree health plan. By factoring in your projected medical usage, healthcare inflation, and income-based surcharges, you can determine exactly how much to allocate toward health costs in your overall retirement needs.
Medigap vs. Medicare Advantage: Key Cost Differences
The core decision most retirees face at age 65 is choosing between Original Medicare supplemented by Medigap, or bundling their coverage into a private Medicare Advantage plan.
Medigap (Medicare Supplement) is a "pay now" strategy. You pay higher upfront monthly premiums, but your out-of-pocket costs for medical services are highly predictable and usually very low. Medicare Advantage (Part C) is a "pay later" strategy. Many plans offer $0 monthly premiums, but you pay copays and coinsurance as you use services, up to an annual maximum out-of-pocket limit.
| Factor | Medigap + Part D | Medicare Advantage (Part C) |
|---|---|---|
| Premium Structure | Part B + Medigap premium + Part D premium | Part B + MA premium (often $0) |
| Out-of-Pocket Risk | Very low (Plan G covers almost all Medicare-approved costs after the Part B deductible). | Higher (You pay copays/coinsurance up to a maximum limit, legally capped at $8,850 in 2024 but often lower). |
| Provider Network | Any doctor or hospital in the U.S. that accepts Medicare. | Restricted to HMO or PPO networks. Out-of-network care may not be covered. |
| Prescription Drugs | Requires a separate standalone Part D plan. | Usually included in the plan. |
| Extra Benefits | None (does not cover routine dental, vision, or hearing). | Often includes basic dental, vision, hearing, and gym memberships. |
Which Strategy Makes Sense for Your Situation
If you anticipate high healthcare costs in retirement, travel frequently, or want the freedom to see specialists without referrals, Medigap is usually the superior financial choice. The higher premiums act as a shield against catastrophic medical bills.
Conversely, if you are in excellent health, have a comfortable emergency fund to cover the out-of-pocket maximum if you get sick, and live in a densely populated area with robust MA provider networks, Medicare Advantage can save you significant money in your early retirement years.
Factoring in Employer Retiree Health Benefits
Some retirees have access to an employer or union-sponsored retiree health plan. If you are eligible, you must compare this option against standard Medicare paths.
Employer plans often act as a bridge for early retirees. If you retire at 60, you cannot join Medicare until 65. An employer plan can cover this gap, functioning similarly to a health insurance bridge.
Once you turn 65, employer plans usually transition to become secondary to Medicare. This means you must still enroll in Medicare Part A and Part B (and pay the Part B premium). The employer plan then acts much like a Medigap policy, covering the costs that Original Medicare leaves behind.
To determine if keeping your employer plan is worth it, compare its monthly premium and maximum out-of-pocket limit to a standard Medigap Plan G. Use the employer retiree health benefit value calculator to run a dedicated comparison. In many cases, employer plans are heavily subsidized and offer excellent value, but if your former employer shifts more costs to retirees, standard Medigap may eventually become cheaper.
How Healthcare Inflation Accelerates Your Costs
When projecting how long your money will last, standard inflation assumptions are not enough. General inflation historically averages around 3%, but healthcare inflation typically runs closer to 5.5% or higher.
This compounding effect means your healthcare costs will consume a larger percentage of your budget in your 80s than they do in your 60s.
| Expense Type | Cost Today | Cost in 10 Years (5.5% inflation) | Cost in 20 Years (5.5% inflation) |
|---|---|---|---|
| $3,000 Out-of-Pocket Spend | $3,000 | $5,124 | $8,753 |
| $185.50 Part B Premium | $185.50/mo | $316.86/mo | $541.24/mo |
| $150.00 Medigap Premium | $150.00/mo | $256.22/mo | $437.66/mo |
If you are calculating your safe withdrawal rate, you must ensure your portfolio can handle these escalating costs. A plan that looks perfectly secure at age 65 can fail at age 85 if medical inflation is ignored.
The Math Behind Your Lifetime Healthcare Cost Projection
The calculator runs a year-by-year projection of your costs under each of the three insurance options. It accounts for base premiums, your estimated medical usage, inflation, and income-based surcharges.
Medicare Advantage Annual Cost Formula
Because Medicare Advantage typically bundles your medical and drug coverage, the formula combines your Part B premium (which you must still pay), your MA plan premium, and your estimated out-of-pocket costs, capped by the plan's maximum limit.
Annual MA Cost = (Inflated MA Premium × 12) + Total Annual Part B Premium + Annual MA Out of Pocket
Where:
Annual MA Out of Pocket = Minimum of (Inflated Medical Spend × MA Coinsurance Rate) OR (MA Max Out of Pocket)
- Inflated MA Premium: Your monthly Advantage plan premium, grown by healthcare inflation.
- Total Annual Part B Premium: The standard Part B premium plus any IRMAA surcharges, annualized.
- Inflated Medical Spend: Your baseline medical usage grown by healthcare inflation.
- MA Coinsurance Rate: The average percentage of bills you pay under the plan.
- MA Max Out of Pocket: The plan's hard cap on your annual medical spending.
Medigap + Part D Annual Cost Formula
Medigap requires you to pay separate premiums for your supplement policy and your prescription drug plan. However, your out-of-pocket costs for medical services are usually limited to the Part B deductible and any drug costs not fully covered by Part D.
Annual Medigap Cost = (Inflated Medigap Premium × 12) + Total Annual Part B Premium + Total Annual Part D Premium + Annual Medigap Out of Pocket
Where:
Annual Medigap Out of Pocket = (Inflated Medical Spend × Part D Out of Pocket Share) + Medigap Deductible
- Inflated Medigap Premium: Your monthly supplement premium (e.g., Plan G), adjusted for inflation.
- Total Annual Part D Premium: The standard Part D premium plus any IRMAA surcharges, annualized.
- Part D Out of Pocket Share: Your estimated share of drug costs (e.g., coinsurance in the coverage gap).
- Medigap Deductible: Minor out-of-pocket costs not covered by the supplement plan (like the Part B deductible).
IRMAA Surcharge Calculation
If your income triggers a surcharge, the calculator inflates the base 2024 IRMAA tiers using the general inflation rate, then checks your MAGI against those future tiers.
Inflated Threshold = Base Income Threshold × (1 + General Inflation Rate) ^ Years Since Base Year
- Base Income Threshold: The starting MAGI tier (e.g., $103,000 for a single filer in 2024).
- General Inflation Rate: The standard economic inflation rate, which the IRS uses to adjust tax brackets and Medicare tiers.
- Years Since Base Year: The number of years between the base data and the projection year.
Frequently Asked Questions
Quick answers to the questions people usually have after running the retirement calculator.
1What is IRMAA and how is it calculated?
IRMAA stands for Income-Related Monthly Adjustment Amount. It is a surcharge added to your Medicare Part B and Part D premiums if your Modified Adjusted Gross Income (MAGI) exceeds certain thresholds. Medicare calculates this based on your tax return from two years prior (e.g., your 2024 income determines your 2026 premiums).
2Who is eligible for an employer retiree health plan?
Eligibility varies entirely by employer. Typically, large corporations, labor unions, and government entities (like the federal government or state school systems) offer these plans to employees who reach a certain combination of age and years of service. If you are a federal employee, you can use the federal retirement calculator to review your FEHB benefits.
3Is Medigap better than Medicare Advantage for retirees who travel?
Generally, yes. Medigap policies are accepted by any doctor or hospital in the United States that accepts Medicare. Medicare Advantage plans operate on HMO or PPO networks, meaning you may have no coverage (or face high out-of-network costs) if you need non-emergency care outside your local geographic area.
4Are Medicare premiums and out-of-pocket costs tax-deductible?
Yes, if you itemize your deductions. You can deduct medical expenses—including Medicare Part B, Part D, Medigap, and Medicare Advantage premiums, as well as out-of-pocket costs—that exceed 7.5% of your Adjusted Gross Income (AGI) for the year.
5Can I switch from Medicare Advantage to Medigap later?
You can switch, but it can be risky. When you first turn 65, you have a 6-month Medigap open enrollment period where you are guaranteed acceptance regardless of pre-existing conditions. If you choose Medicare Advantage and later try to switch to Medigap outside of a specific trial right period, insurance companies in most states can subject you to medical underwriting, meaning they can charge you higher premiums or deny you coverage entirely based on your health history.
6Does Medicare cover long-term care or nursing homes?
No. Medicare only covers short-term skilled nursing care (up to 100 days) following a qualifying hospital stay. It does not cover custodial care, such as help with bathing, dressing, or long-term residence in an assisted living facility. You must rely on long-term care insurance, Medicaid, or personal savings for those costs.
7How do I estimate my annual medical spend for this calculator?
Look at your current out-of-pocket healthcare costs over the last year, excluding premiums. Include copays, deductibles, dental visits, vision care, and prescription drugs. If you are generally healthy, a baseline of $2,000 to $3,000 is a safe starting point, but you should adjust this higher if you manage chronic conditions.
Next Steps
Once you understand your projected healthcare costs, the next step is ensuring your retirement portfolio can support them alongside your daily living expenses.
Use the how long will my money last calculator to input your new healthcare estimates and test your portfolio's longevity. If you are concerned that rising medical costs will deplete your savings, review your withdrawal strategy using the safe withdrawal rate calculator to see if you need to adjust your spending or save more before finalizing your retirement date.