Early Retirement Financial Planning: Social Security, Medicare, Roth Conversions, and Health Care

By Trevor Scotto, CPA, CFP®

Last updated October 1, 2026. Tax, health coverage, and Social Security figures below were rechecked against IRS, Healthcare.gov, Medicare.gov, and Social Security Administration sources on that date, and they change periodically.

The sequence below is a general framework, not a prescription. The right order and the right answers depend on your income sources, accounts, health, and household. Each step is covered in more detail in the sections that follow.

1. Estimate your annual spending and where it may come from. List the income you need each year, including health insurance and taxes, and which accounts could fund it: taxable brokerage, pre-tax retirement accounts, Roth accounts, an HSA, cash, and any employer equity you still hold.
2. Choose coverage until Medicare begins. Options generally include a spouse's employer plan, COBRA, or an ACA Marketplace plan, and the cost and trade-offs differ for each.
3. Set a target income range for each year before Medicare. If you use Marketplace coverage, your modified adjusted gross income may determine whether you receive a premium tax credit, so capital gains, IRA withdrawals, and Roth conversions belong in the same estimate.
4. Decide whether and when to convert pre-tax money to Roth. A conversion adds taxable income now in exchange for potentially lower taxes later, and it may reduce ACA credits and raise Medicare premiums two years later.
5. Decide when to claim Social Security. Claiming earlier means a permanently smaller monthly benefit, while claiming later means funding spending from other sources in the meantime.
6. Plan your Medicare enrollment. Mark the seven-month Initial Enrollment Period around your 65th birthday and confirm when to stop HSA contributions.
7. Revisit the plan every year. Tax law, premium credits, markets, and your spending can change, so each year's income target may need to be updated with your CPA.

What to Gather Before a Planning Conversation

• Your last two federal and state tax returns
• Recent statements for every account, noted as taxable, pre-tax, Roth, or HSA
• Equity compensation records, such as RSU vesting schedules, option grants, and Forms W-2, 3921, and 1099-B
• Quotes or details for the health coverage you are considering before Medicare
• Your Social Security statement from ssa.gov and your expected annual spending

If you would like to work through this sequence with a CPA-integrated, fee-only fiduciary team, you can schedule a conversation with our team. Our retirement transition planning page describes how we approach this stage.

Most retirement planning resources assume you retire at or after age 65, when Medicare eligibility begins and Social Security full retirement age is close. Early retirees face a different reality. If you retire at 55, 58, or 62, you may spend several years without access to Medicare and several years before reaching your Social Security full retirement age.

For anyone born in 1960 or later, full retirement age is 67, according to the Social Security Administration (ssa.gov/benefits/retirement/planner/agereduction.html, accessed October 1, 2026). You can claim Social Security as early as 62, but doing so permanently reduces your monthly benefit by up to 30 percent. On the other end, delaying past full retirement age may increase your benefit by 8 percent per year up to age 70.

Medicare eligibility begins at 65, regardless of when you retire, according to the Centers for Medicare and Medicaid Services (medicare.gov/basics/get-started-with-medicare/sign-up/when-does-medicare-coverage-start, accessed October 1, 2026). Retiring early does not accelerate Medicare eligibility. You must arrange alternative health care coverage for the years between retirement and age 65.

The combination of these rules creates a planning gap. During this gap, your decisions about Social Security, health care, and Roth conversions can affect each other in ways that are not always obvious.

Social Security is a lifetime, inflation-adjusted income source for most retirees. The timing of your claim permanently affects your monthly benefit amount, and each timing choice involves trade-offs.

Claiming at 62: The Permanent Reduction

If you claim Social Security at age 62 and your full retirement age is 67, your benefit is reduced by approximately 30 percent, according to the SSA (ssa.gov/benefits/retirement/planner/agereduction.html, accessed October 1, 2026). For a worker whose full retirement age benefit is $2,000 per month, claiming at 62 would reduce the monthly payment to approximately $1,400.

This reduction is permanent. It does not reverse when you reach full retirement age. The SSA calculates the reduction based on the number of months between your claiming date and your full retirement age, using a formula of 5/9 of 1 percent for each of the first 36 months and 5/12 of 1 percent for additional months.

Delaying Past Full Retirement Age: The 8 Percent Credit

If you wait past your full retirement age to claim, your benefit increases by 8 percent for each full year you delay, up to age 70, according to the SSA (ssa.gov/oact/quickcalc/early_late.html, accessed October 1, 2026). For the same worker with a $2,000 full retirement age benefit, delaying to age 70 could increase the monthly payment to approximately $2,480, although you would give up the benefits you could have received in the years before you claimed.

The Earnings Test If You Work in Early Retirement

If you claim Social Security before full retirement age and continue to work, the SSA may withhold benefits if your earnings exceed certain limits. For 2026, the SSA withholds $1 for every $2 earned above $24,480 if you are under full retirement age for the entire year (ssa.gov/benefits/retirement/planner/whileworking.html, accessed October 1, 2026). In the year you reach full retirement age, the threshold increases to $65,160, with $1 withheld for every $3 earned above that amount, counting only earnings through the month before you reach full retirement age.

Benefits withheld under the earnings test are not necessarily lost permanently. The SSA recalculates your benefit at full retirement age to account for months when benefits were withheld. The earnings test counts wages and net self-employment income, not investment income or pensions.

How a CPA-Integrated Advisor Approaches the Decision

The claiming decision is not purely a break-even calculation. Your tax situation, life expectancy, spousal benefits, and other income sources all factor in. A CPA-integrated advisor can model the tax implications of claiming at different ages, including how Social Security income interacts with your other sources of income and affects your overall tax liability. For clients with significant equity compensation or other income sources, the optimal claiming strategy may depend on when you plan to sell concentrated stock positions or exercise options.

If you are exploring equity compensation strategies in the context of early retirement, our equity compensation planning services provide additional context on coordinating stock decisions with retirement income planning.

For early retirees under 65, the Affordable Care Act (ACA) Marketplace is often the primary source of health insurance. ACA premium tax credits can significantly reduce monthly premiums, but these credits are tied to your household income, which creates a planning challenge.

How ACA Subsidies Work

ACA premium tax credits are available to households with income between 100 percent and 400 percent of the federal poverty level (FPL). The credit reduces your monthly premium for a benchmark Silver plan, and the amount of the credit depends on your household income relative to the FPL.

For 2026 coverage, premium tax credit eligibility is based on the 2025 federal poverty guidelines, because the IRS uses the most recently published guidelines on the first day of open enrollment (IRS Premium Tax Credit Q&A, Q7, accessed October 1, 2026). Using the 2025 guidelines of $15,650 for one person and $21,150 for two people (healthcare.gov/glossary/federal-poverty-level-fpl, accessed October 1, 2026), the 400 percent threshold works out to $62,600 for a single person and $84,600 for a two-person household in the contiguous United States. Exceeding this threshold by even a small amount may eliminate your entire premium tax credit.

The 2026 Cliff and No Repayment Cap

Beginning with 2026 coverage, the 400 percent FPL cliff returns. If your household income exceeds 400 percent of FPL, you generally cannot claim the premium tax credit. Additionally, if you received advance premium tax credits during the year and your final income exceeds the threshold, you may have to repay all of the advance credits. There is no repayment cap for excess advance premium tax credits for tax years after 2025, according to IRS guidance (IRS Premium Tax Credit Q&A, Q31, accessed October 1, 2026). Congress temporarily removed the 400 percent limit for tax years 2021 through 2025, and that expanded eligibility is not in effect for 2026.

This means a Roth conversion or a capital gain that pushes your income slightly above the threshold may cost more than the additional income tax on the conversion itself. The lost credit and repayment obligation may outweigh any long-term tax benefit the conversion was meant to produce, so the size of a conversion deserves careful modeling.

What Counts Toward ACA MAGI

For the premium tax credit, modified adjusted gross income (MAGI) is your adjusted gross income plus any nontaxable Social Security benefits, tax-exempt interest, and excluded foreign income, according to the IRS (IRS Premium Tax Credit Q&A, Q8, accessed October 1, 2026). In practice, wages, interest, dividends, capital gains, pension income, taxable Social Security, traditional IRA withdrawals, and Roth conversions all flow into it. Qualified Roth IRA withdrawals generally do not count toward ACA MAGI.

This distinction matters for early retirees. If you have built a Roth IRA through conversions or direct contributions, withdrawals from the Roth account can fund living expenses without increasing your ACA household income. This may help you stay below the 400 percent FPL threshold and preserve your premium tax credits, although it depends on how much Roth money you hold and the tax cost of building it.

Medicare eligibility begins at age 65, and the enrollment rules are strict. Missing deadlines can result in permanent late enrollment penalties and coverage gaps.

Your Initial Enrollment Period

Your Initial Enrollment Period (IEP) is a seven-month window that begins three months before the month you turn 65, includes your birthday month, and extends three months after, according to CMS (medicare.gov/basics/get-started-with-medicare/sign-up/when-does-medicare-coverage-start, accessed October 1, 2026). If you turn 65 in October, your IEP runs from July 1 through January 31 of the following year.

If you are already receiving Social Security benefits when you turn 65, you are generally enrolled in Medicare Parts A and B automatically. If you are not yet receiving Social Security, you must apply through the Social Security Administration.

Special Enrollment Period If You or Your Spouse Are Still Working

If you or your spouse have group health coverage based on current employment, you may be able to delay Medicare Part B without a late enrollment penalty, according to CMS (medicare.gov/basics/get-started-with-medicare/medicare-basics/working-past-65, accessed October 1, 2026). When employment or coverage ends, you have an eight-month Special Enrollment Period to enroll in Part B.

Important: COBRA and retiree health coverage generally do not count as coverage based on current employment. If you retire at 65 and move to COBRA, do not assume COBRA extends your Medicare Part B deadline.

Late Enrollment Penalties

If you miss your Initial Enrollment Period and do not qualify for a Special Enrollment Period, you can enroll during the General Enrollment Period from January 1 through March 31 each year. However, you may face a Part B late enrollment penalty of typically an extra 10 percent for each year you could have signed up for Part B but did not, according to CMS (medicare.gov/basics/get-started-with-medicare/medicare-basics/working-past-65, accessed October 1, 2026). The penalty is added to your monthly Part B premium for as long as you have Part B.

The HSA Interaction

If you have a Health Savings Account (HSA) through a high-deductible health plan, Medicare enrollment can affect your ability to contribute. Medicare advises stopping HSA contributions approximately six months before applying for Social Security or Medicare, because premium-free Part A may be retroactive up to six months. Contributing to an HSA after Medicare enrollment, including retroactive enrollment, may result in excess contribution penalties.

Medigap Open Enrollment

If you choose Original Medicare, your best opportunity to buy a Medigap supplement is the six-month open enrollment period that begins when you are 65 or older and enrolled in Part B. During this window, insurers generally cannot deny coverage or charge higher premiums based on preexisting conditions. Delaying Part B also delays this Medigap window.

For early retirees, the years between retirement and required minimum distributions (RMDs) may present a tax planning opportunity. If your income drops after you stop working, you may be in a lower tax bracket. This can make Roth conversions attractive, because you pay income tax on the converted amount at your current rate, and future growth in the Roth account is generally tax-free.

How a Roth Conversion Works

A Roth conversion involves moving money from a traditional IRA, 401(k), or similar pre-tax account into a Roth IRA. You pay ordinary income tax on the taxable amount in the year of the conversion. Once the funds are in the Roth IRA, qualified withdrawals are generally tax-free, and Roth IRAs are not subject to RMDs during your lifetime.

The Roth Conversion Ladder

Some early retirees use a strategy called a Roth conversion ladder. Each year, you convert a portion of your traditional retirement account to a Roth IRA. Each conversion starts its own five-year clock. Withdrawing converted amounts within five years, counted from January 1 of the conversion year, may trigger the 10 percent additional tax if you are under 59 1/2 and no exception applies, according to the IRS (IRS Publication 590-B, accessed October 1, 2026). After that period, the converted principal can generally be withdrawn without the 10 percent penalty. This can provide access to retirement funds before age 59 1/2, but the five-year rule for conversions is separate from the rule for when Roth earnings can be withdrawn tax-free.

However, the conversion itself is taxable income in the year it occurs. It is included in your ACA MAGI, which means it can affect your premium tax credits if you are on Marketplace coverage. The interplay between conversion amounts, tax brackets, ACA subsidies, and future RMDs requires careful modeling.

The ACA MAGI Trade-Off

This is where the Roth conversion and ACA subsidy decisions collide. Every dollar you convert increases your ACA MAGI. If your income is already near the 400 percent FPL threshold, a conversion could push you over the cliff and eliminate your premium tax credits.

A CPA-integrated advisor can model multiple scenarios: no conversion, a conversion sized to stay below the ACA threshold, and a larger conversion that sacrifices the subsidy. The comparison should weigh the immediate lost subsidy against the potential long-term tax benefits of building a Roth pipeline and reducing future RMDs, which depend on future tax law, rates, and your own circumstances.

IRMAA: The Medicare Surcharge Connection

Roth conversions also affect Medicare premiums through the Income-Related Monthly Adjustment Amount (IRMAA). If your modified adjusted gross income from two years prior exceeds certain thresholds, you pay higher premiums for Medicare Part B and Part D, according to the Social Security Administration (ssa.gov/OP_Home/handbook/handbook.25/handbook-2504.html, accessed October 1, 2026). A large conversion in one year could trigger IRMAA surcharges two years later. This is another reason to model conversion amounts carefully rather than converting aggressively in a single year.

Each of these decisions, Social Security timing, health care coverage, Medicare enrollment, and Roth conversions, affects the others. A CPA-integrated, fee-only fiduciary advisor is positioned to coordinate them because tax expertise is built into the planning process rather than added as an afterthought.

For example, the decision to claim Social Security at 62 versus 67 affects your taxable income, which affects your ACA subsidy eligibility, which affects how much you can convert to a Roth IRA, which affects your future RMDs and IRMAA surcharges. Treating any of these decisions in isolation may lead to a result that does not fit your overall plan.

Our tax planning services are designed to integrate tax strategy with retirement income planning, not just prepare your annual return. For high-net-worth retirees navigating this transition, our work with high-net-worth clients provides additional context on how we approach complex retirement income and tax coordination.

If you are approaching early retirement and want these decisions modeled together, schedule a conversation with our team. Results depend on your individual circumstances, and the conversation is a starting point for planning rather than a recommendation.

For more articles on retirement, tax planning, and equity compensation, visit our news and insights page.

Can I get Medicare before age 65 if I retire early?

No. Medicare eligibility generally begins at age 65, regardless of when you retire. Retiring early does not accelerate Medicare eligibility. Before age 65, you typically need employer coverage, COBRA, ACA Marketplace coverage, or another health plan. If you or your spouse have group health coverage based on current employment, you may be able to delay Medicare Part B without a late enrollment penalty and enroll during an eight-month Special Enrollment Period after employment or coverage ends.

How much does claiming Social Security at 62 reduce my benefit?

If your full retirement age is 67, claiming at 62 reduces your benefit by approximately 30 percent, according to the Social Security Administration (ssa.gov/benefits/retirement/planner/agereduction.html, accessed October 1, 2026). For a worker with a full retirement age benefit of $2,000 per month, the age 62 benefit would be approximately $1,400. This reduction is permanent and does not reverse at full retirement age.

Do Roth conversions affect ACA premium tax credits?

Yes. Roth conversions are included dollar-for-dollar in your ACA modified adjusted gross income (MAGI) for the year of the conversion, according to the IRS (IRS Premium Tax Credit Q&A, Q8, accessed October 1, 2026). If your household income exceeds 400 percent of the federal poverty level, you may lose all premium tax credits. For 2026 coverage, which uses the 2025 federal poverty guidelines, the 400 percent threshold is $62,600 for a single person and $84,600 for a two-person household in the contiguous United States (healthcare.gov/glossary/federal-poverty-level-fpl, accessed October 1, 2026).

What is a Roth conversion ladder?

A Roth conversion ladder is a strategy where you convert a portion of your traditional retirement account to a Roth IRA each year. Each conversion starts its own five-year clock. Withdrawing converted amounts within five years, counted from January 1 of the conversion year, may trigger the 10 percent additional tax if you are under 59 1/2 and no exception applies (IRS Publication 590-B). After that period, the converted principal can generally be withdrawn without the penalty. This can provide early access to retirement funds, but the conversion amount is taxable income in the year it occurs and affects ACA MAGI and potentially IRMAA surcharges.

Will a Roth conversion affect my Medicare premiums?

It may. Medicare premiums are affected by IRMAA (Income-Related Monthly Adjustment Amount), which is based on your modified adjusted gross income from two years prior. A large Roth conversion in one year could trigger higher Medicare Part B and Part D premiums two years later. This is separate from the ACA MAGI impact and should be modeled alongside it.

When should I stop contributing to my HSA before Medicare?

Medicare advises stopping HSA contributions approximately six months before applying for Social Security or Medicare, because premium-free Part A may be retroactive up to six months. Contributing to an HSA after Medicare enrollment, including retroactive enrollment, may result in excess contribution penalties. If you plan to claim Social Security at 65 and enroll in Medicare, you may need to stop HSA contributions earlier than expected.

By Trevor Scotto, CPA, CFP®. Trevor Scotto is a CPA and CFP® professional at Fiduciary Financial Group, a fee-only, fiduciary wealth management firm with offices in San Rafael, Walnut Creek, Boise, and Ada County. FFG integrates CPA expertise with comprehensive financial planning to serve high-net-worth retirees, executives, tech professionals, and business owners.

This article has been reviewed for accuracy and compliance.