The Medicare gap — the difference between what Medicare pays and what you actually owe — can cost retirees anywhere from a few hundred to several thousand dollars a year in out-of-pocket expenses. Original Medicare (Parts A and B) covers roughly 80% of approved medical costs, leaving you responsible for the remaining 20% with no annual cap. That uncovered 20% is the gap, and on this Fourth of July, it’s worth taking a moment away from the cookout to understand exactly where your retirement money could quietly disappear — and what you can do to protect it.
What exactly is the Medicare coverage gap?
The Medicare gap refers to two separate but equally important problems. The first is the general coverage shortfall in Original Medicare: you pay 20% of most Part B services (doctor visits, outpatient care, medical equipment) indefinitely, with no out-of-pocket maximum to protect you. A serious illness or hospital stay can run your costs into the tens of thousands. The second, more specific gap is the Part D prescription drug coverage gap — historically called the “donut hole” — which has been largely closed for most drugs since 2024, though cost-sharing rules still apply.
Understanding which gap affects you most is the first step to plugging it.
How do Medigap and Medicare Advantage help close the gap?
Two main options exist for covering what Original Medicare leaves behind.
Medigap (Medicare Supplement Insurance) is private insurance you buy alongside Original Medicare. Standardised plans — labelled A through N — cover some or all of the 20% you’d otherwise pay, plus extras like foreign travel emergency coverage. Plan G is currently one of the most popular because it covers nearly everything except the Part B deductible (which is $240 in 2025). Premiums vary by location and insurer but typically run $100–$300 per month for someone in their mid-60s.
Medicare Advantage (Part C) bundles Parts A, B, and usually D into one private plan. Many plans have $0 premiums but charge copays for services and come with provider networks. They often include dental, vision, and hearing benefits that Original Medicare skips entirely. The trade-off: you’re limited to in-network providers, which matters if you travel or snowbird between states.
Neither option is universally better. Your health, your travel habits, and your budget all shape the right answer.
What is the Medicare Part B premium for 2025 and how does IRMAA affect it?
The standard Medicare Part B premium for 2025 is $185.00 per month, deducted directly from your Social Security check if you’re receiving benefits. But higher earners pay more — sometimes significantly more — through a surcharge called IRMAA (Income-Related Monthly Adjustment Amount).
IRMAA is triggered when your modified adjusted gross income (MAGI) from two years prior exceeds certain thresholds. For 2025, the surcharges kick in when your 2023 income exceeded $106,000 (single) or $212,000 (married filing jointly). At the highest income tier, Part B alone can cost over $628 per month per person.
The critical word there is two years prior. Medicare looks back at your 2023 tax return to set your 2025 premium. If your income has dropped since then — because you retired, sold a business, or had a one-time event — you can appeal the surcharge using IRS Form SSA-44. Many retirees don’t know this and overpay for years.
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When should I claim Social Security to maximise my benefit?
This question intersects directly with Medicare costs because your Social Security payment is where Medicare premiums are collected. Claiming Social Security later means a larger benefit — and that larger benefit can more comfortably absorb premium deductions.
You can claim as early as 62, but your benefit is permanently reduced by up to 30% compared to your full retirement age (FRA). FRA is 67 for anyone born in 1960 or later. Wait until 70, and you earn delayed retirement credits worth 8% per year beyond FRA — a guaranteed, inflation-adjusted return that’s hard to beat anywhere else.
The break-even point for waiting typically lands around age 80–82. If your health and family history suggest longevity, waiting pays off. If not, earlier claiming may make more sense. The right answer is personal, but the math favours patience for most people.
How much of my Social Security benefit is taxable?
Up to 85% of your Social Security benefit can be subject to federal income tax, depending on your “combined income” — a formula that adds your adjusted gross income, non-taxable interest, and half your Social Security benefits together.
- If that combined income is below $25,000 (single) or $32,000 (married filing jointly), your benefits are tax-free.
- Between $25,000–$34,000 single (or $32,000–$44,000 married), up to 50% is taxable.
- Above those thresholds, up to 85% is taxable.
Strategies like Roth conversions in lower-income years, careful IRA withdrawal timing, and managing investment income can all reduce how much of your benefit gets taxed. This is one of the highest-value planning moves available to retirees in their early 60s.
What are the RMD rules for 2025 and 2026 I need to know?
Required Minimum Distributions (RMDs) are the IRS’s way of collecting tax on money that’s grown tax-deferred in traditional IRAs and 401(k)s. You must begin taking RMDs by April 1 of the year after you turn 73 (under SECURE 2.0 Act rules). The amount is calculated by dividing your account balance as of December 31 of the prior year by an IRS life expectancy factor.
For 2026, the rules remain the same as 2025 — no major changes are currently enacted. However, RMDs matter enormously for IRMAA planning: a large RMD can push your income over an IRMAA threshold and spike your Medicare premiums two years later. Strategies like Qualified Charitable Distributions (QCDs) — donating up to $105,000 directly from your IRA to charity in 2025 — can reduce your RMD-driven income while satisfying your philanthropic goals.
Your Medicare gap action plan for this summer
The Fourth of July is a good milestone for a mid-year financial check-in. Here’s a simple checklist:
- Review your Medicare coverage type — Original Medicare, Advantage, or a Medigap supplement?
- Check if you’re subject to IRMAA — log into ssa.gov and review your current premium.
- Model your Social Security claiming age — even a rough calculator run can reveal thousands of dollars in lifetime difference.
- Project your RMD for this year — and consider whether a QCD could reduce your taxable income.
- Estimate your combined income — to understand how much of your Social Security may be taxed.
None of these require a financial advisor on a holiday weekend. A notepad, last year’s tax return, and 30 minutes of focused thinking can give you a clearer picture than most people get in a year.
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Frequently Asked Questions
When should I claim Social Security to maximise my benefit?
Waiting until age 70 maximises your Social Security benefit by earning delayed retirement credits of 8% per year beyond your full retirement age (67 for those born in 1960 or later). The break-even point versus claiming early is typically around age 80–82, so longevity and health are the key factors in deciding.
How much of my Social Security benefit is taxable?
Up to 85% of your Social Security benefit can be federally taxable if your combined income exceeds $34,000 as a single filer or $44,000 as a married couple filing jointly. Below $25,000 single or $32,000 married, your benefits are completely tax-free. Strategic Roth conversions and careful withdrawal planning can reduce this tax burden.
What are the RMD rules for 2025 and 2026?
Under the SECURE 2.0 Act, Required Minimum Distributions must begin by April 1 of the year after you turn 73, and the rules remain consistent for both 2025 and 2026. Your RMD amount is calculated by dividing your prior year-end account balance by an IRS life expectancy factor. Qualified Charitable Distributions of up to $105,000 per year can count toward your RMD while reducing your taxable income.
How do I avoid Medicare IRMAA surcharges?
IRMAA surcharges are based on your income from two years prior, so proactive income planning — such as spreading Roth conversions across lower-income years or managing capital gains — can keep you below the thresholds. If your income has dropped significantly since that look-back year (due to retirement or a one-time event), you can appeal using IRS Form SSA-44 to have your premium recalculated. The 2025 IRMAA threshold starts at $106,000 for single filers.
What is the Medicare Part B premium for 2025?
The standard Medicare Part B premium for 2025 is $185.00 per month, automatically deducted from your Social Security benefit if you’re receiving it. Higher-income beneficiaries pay more through IRMAA surcharges, with the highest tier reaching over $628 per month. The Part B deductible for 2025 is $240 per year.