Tax-Centric Retirement Planning in Florida: Roth Conversions, IRMAA, and Withdrawal Strategy

Florida retirees often expect taxes to get simpler the day they cross the state line. In one important way, they do: Florida is widely recognized as a state with no state personal income tax, and that status is rooted in Florida's constitution. But the bigger truth is that retirement taxes are still a federal coordination problem, especially once you add Roth conversions, Medicare's IRMAA surcharges, required minimum distributions (RMDs), and charitable giving.

This guide unifies those moving parts into a single framework so your decisions don't accidentally "win" in one area (like reducing future RMDs) while quietly "losing" in another (like triggering years of higher Medicare premiums).

A quick note before we begin: this is educational content and not individualized tax or legal advice. Retirement tax strategy is highly personal, and small details (filing status, pension timing, IRA basis, capital gains, charitable intent, and Medicare enrollment timing) can change the right answer.

Florida retirement taxes and what actually changes when you move

Florida's biggest retirement-tax headline is simple: Florida does not generally tax your retirement income at the state level because it has no state personal income tax, a reality tied to constitutional constraints on taxing the income of "natural persons." In practical terms, that means a Roth conversion (which is taxable income federally) typically does not generate a separate Florida income tax bill, unlike the same conversion done while resident in many other states.

What does not change when you move to Florida is the federal machinery that drives most "retirement tax surprises":

Medicare's IRMAA surcharges are based on your federal tax return data and Social Security's IRMAA determination process, not your state of residence. Social Security states that it uses your most recent federal tax return information from the IRS and calculates IRMAA using modified adjusted gross income (MAGI), defined as AGI plus tax-exempt interest.

RMD rules are also federal. The IRS explains that IRA owners generally must begin RMDs at age 73, and missing an RMD can trigger an excise tax of 25% of the shortfall (reduced to 10% if corrected within 2 years).

Social Security taxation is federal. IRS Publication 915 lays out the income thresholds that determine whether up to 50% or 85% of Social Security benefits are taxable, depending on the total of one-half of benefits plus other income relative to statutory thresholds.

So Florida helps most with the state income tax drag. But the most valuable planning often comes from managing the federal "stack" of taxable income, Medicare thresholds, and future forced distributions.

A Florida-specific side note worth remembering: while the state income tax line disappears, Florida retirees still face other state and local taxes, especially property taxes, where planning decisions (primary residence, homestead status, local exemptions) may matter more than expected. For example, Florida's Department of Revenue notes that some counties and municipalities may adopt additional homestead exemptions for eligible seniors under Florida constitutional and statutory authority.

The integrated tax-centric framework

Most retirement tax advice gets fragmented because it treats each tactic as a standalone trick: "Do Roth conversions." "Watch IRMAA." "Use QCDs." "Spend taxable first." In reality, these are all levers on the same machine.

A practical tax-centric retirement framework tracks three numbers each year, because these three numbers are what your decisions keep colliding with:

Your taxable income bracket

This is where your federal marginal rate lives (and where bracket-filling Roth conversions come from). For 2026, the IRS confirmed that the top marginal rate remains 37% and published the inflation-adjusted bracket thresholds (e.g., the 24% bracket begins above $105,700 of taxable income for single filers and $211,400 for married filing jointly).

Your "MAGI-sensitive" thresholds

This is where IRMAA (Medicare Part B and Part D surcharges) and certain other surtaxes and phaseouts live. Social Security explicitly defines IRMAA MAGI as AGI plus tax-exempt interest.

Separately, the IRS explains that the 3.8% Net Investment Income Tax (NIIT) applies above MAGI thresholds such as $250,000 (married filing jointly) and $200,000 (single or head of household).

Your future "forced income" pressure

This is your projected RMD trajectory. Large pre-tax balances can force larger distributions later, which can raise taxable income, increase the portion of Social Security that is taxable, and push you into IRMAA tiers. The IRS emphasizes that RMDs generally begin at 73 and must be distributed each year after the required beginning date.

FamilyVest's recent retirement tax content makes the same conceptual point in plain language: the win is rarely a single move; it's a set of coordinated decisions, evaluated across multiple years, including IRMAA exposure and the size of future pre-tax balances.

The planning implication is straightforward: stop making retirement tax decisions one tax return at a time. Roth conversions and withdrawal sequencing are multi-year decisions, and IRMAA is literally determined using prior-year tax returns (a built-in lookback). Social Security states that for 2026 IRMAA, it generally uses tax year 2024 information (from returns filed in 2025).

Roth conversions in retirement: the Florida "Roth window" and how to size it

A Roth conversion is not magic. It's a trade: you voluntarily recognize taxable income now (by moving funds from pre-tax to Roth) to potentially reduce taxes and increase flexibility later.

At the technical level, Treasury regulations explain that an amount converted to a Roth IRA is includible in gross income as a distribution under the normal IRA distribution rules for the taxable year in which it is distributed or transferred (with basis rules applying). IRS Publication 590-B reinforces the same core point: a conversion may be treated as a rollover for Roth IRA purposes, but it is not an exception to the rule that distributions from a traditional IRA are taxable in the year received; conversion distributions are includible in gross income under that rule.

Why Florida can change Roth conversion math

If you moved from a state with income tax to Florida, conversions done after establishing Florida residency can be meaningfully cheaper on an all-in basis, because Florida's lack of a state personal income tax removes one layer of tax cost on the conversion.

That said, Florida does not remove the reasons Roth conversions can backfire:

Converting too much in one year can push you into higher federal brackets or Medicare premium tiers (IRMAA). FamilyVest's Roth conversion framework explicitly flags those risks and encourages running multi-year math rather than making a one-year decision in a vacuum.

You generally cannot "undo" a conversion. The IRS states plainly that, effective January 1, 2018, conversions from traditional, SEP, or SIMPLE IRAs to Roth IRAs cannot be recharacterized (and rollovers to Roth IRAs from other retirement plans also cannot be recharacterized).

The classic Roth conversion window still matters in Florida

Many retirees have a period where taxable income is temporarily lower: after full-time work ends, but before Social Security plus RMDs fully stack up. FamilyVest notes that "best conversion windows often occur before Social Security and before RMDs," even though later conversions can still be useful in some plans.

The IRS clarifies that RMDs for IRAs generally begin at age 73 (with a first-year timing choice between taking the first RMD by December 31 of the year you turn 73 or delaying to April 1 of the next year, at the cost of having two distributions in one tax year).

That creates a common Florida retiree pattern:

Use lower-income years to convert pre-tax dollars into Roth "at a known tax rate," reducing future RMD size and increasing future flexibility. Then, once RMDs and Social Security begin, shift to a more surgical approach, with conversions smaller and coordinated closely with IRMAA.

A practical way to size conversions: bracket-fill with an IRMAA guardrail

A widely used approach is "bracket filling": choose a target marginal bracket (often the 12%, 22%, or 24% bracket depending on the household's situation) and convert up to the top of that bracket, but only after checking other cliffs (IRMAA tiers, NIIT thresholds, and Social Security taxation effects).

For example, the IRS published that in 2026, the 24% bracket begins above $105,700 of taxable income for single filers and $211,400 for married filing jointly (with the 22% bracket beginning above $50,400 single and $100,800 married filing jointly). The same IRS release confirms the 2026 standard deduction under the One Big Beautiful Bill (OBBB) adjustments: $32,200 for married filing jointly, $16,100 for single or MFS, and $24,150 for head of household.

In Florida, where you are often only solving for federal tax, this bracket-fill method becomes cleaner, but it still must be paired with the Medicare premium math, which is based on MAGI, not taxable income. Social Security emphasizes that MAGI for IRMAA equals AGI plus tax-exempt interest.

IRMAA planning: how to avoid Medicare premium surprises

IRMAA is one of the most common "why did my premiums jump?" moments in retirement. It matters because Roth conversions, RMDs, capital gains, and even municipal-bond interest can raise the income Social Security uses for Medicare premium surcharges.

What IRMAA is and how it's calculated

Social Security explains that if you have higher income, you pay an additional amount for Medicare Parts B and D, called the income-related monthly adjustment amount (IRMAA).

Crucially, Social Security says it uses your most recent federal tax return information from the IRS and calculates IRMAA based on MAGI = AGI + tax-exempt interest.

For determining 2026 IRMAA, Social Security states it generally uses tax year 2024 information (from a return filed in 2025).

This one detail drives a key planning behavior: you must plan IRMAA two tax years ahead. A big conversion in 2026 won't affect 2026 premiums; it generally affects 2028 premiums.

The 2026 IRMAA tiers and what "one bracket" can cost

For 2026, CMS published the standard Part B premium as $202.90 per month and also published the Part B income-related adjustment amounts and total premiums by income tier. Social Security publishes the same tier structure on its Medicare premiums page.

Here is a consolidated view for full Part B coverage (individual and married filing jointly), using the official 2026 CMS figures:

A planning insight that matters in real life: these tiers behave like cliffs in practice. If your MAGI falls into a tier, you generally pay that tier's monthly amount for the year. That's why a "slightly too large" Roth conversion can create a Medicare premium surprise that feels disproportionate to how far your income crossed a line.

Also note the filing-status trap: CMS and Social Security show that "married filing separately" with a living-together arrangement can trigger higher IRMAA at much lower income levels than joint filers.

When can IRMAA be reduced after the fact

If your income has dropped due to certain life-changing events (for example: marriage or divorce, death of a spouse, work stoppage or reduction, loss of income-producing property, pension plan changes), Social Security instructs beneficiaries to contact SSA and notes that Form SSA-44 can be used to report a life-changing event and request a reduction in IRMAA.

This matters for Florida retirees because many of the biggest income shifts, including retirement itself, selling a business, selling real estate, or widowhood, can change your IRMAA picture dramatically.

QCDs and charitable tactics: lowering AGI to protect brackets and IRMAA

Qualified Charitable Distributions (QCDs) are one of the few retirement tax tools that can reduce not only taxable income but also AGI, a foundational input into IRMAA MAGI.

What a QCD is and why it's different from "take IRA money, then donate"

IRS Publication 590-B defines a QCD as generally a nontaxable distribution made directly by the trustee of your IRA (excluding an ongoing SEP or SIMPLE IRA) to an organization eligible to receive tax-deductible contributions, and the IRA owner must be at least age 70 1/2 when the distribution is made.

The IRS also highlights several key operating rules:

The maximum annual exclusion for QCDs (per person) is $108,000 (as reflected in Publication 590-B for 2025); amounts above the limit are included in income like other distributions, and a spouse on a joint return can also exclude up to the limit from their own IRA(s).

You cannot claim a charitable contribution deduction for any QCD amount that is not included in income.

A QCD counts toward your RMD. Publication 590-B explicitly notes: "A QCD will count towards your required minimum distribution."

The practical meaning: if you are charitably inclined and already planning to give (and especially if RMDs are part of your income picture), a QCD can often produce a better after-tax result than taking a taxable RMD and then donating cash, because the QCD keeps the distribution out of income in the first place.

Why QCDs pair so well with IRMAA planning

Social Security determines IRMAA using MAGI (AGI + tax-exempt interest). Because QCDs are generally nontaxable IRA distributions excluded from income, they can reduce AGI relative to an otherwise-identical plan that takes the IRA distribution into income.

That can make QCDs uniquely powerful in years when:

You are close to an IRMAA threshold. You are close to an NIIT threshold (because NIIT is based on MAGI thresholds). You are trying to do Roth conversions, but don't want "charitable giving" to pile on more taxable distributions.

An advanced QCD detail that many retirees miss

Publication 590-B explains that beginning in tax years after December 31, 2019, the amount of QCDs you can exclude from income is reduced by certain deductible IRA contributions made after age 70 1/2 (the publication provides a "QCD Adjustment Worksheet" and explains the offset concept).

This comes up most often for retirees who still have earned income (or a working spouse) and are making deductible traditional IRA contributions after 70 1/2 while also using QCDs. It doesn't eliminate the QCD value, but it can reduce the "clean" exclusion if not tracked.

Also, Publication 590-B describes a one-time election to make a QCD (up to $54,000 in the publication's current example) to certain split-interest entities (such as charitable remainder trusts or charitable gift annuities), subject to specific requirements. This is niche, but for some high-net-worth Florida retirees, it's a meaningful way to connect retirement assets to charitable legacy planning without unnecessarily inflating taxable income.

Withdrawal sequencing and the annual playbook that ties everything together

Withdrawal sequencing is where your plan becomes real. It's also where most "tax traps" appear, because sequencing determines how much income you create, what kind of income it is, and which thresholds you trip.

FamilyVest puts it clearly: withdrawal order affects your tax bracket, the taxable portion of Social Security, whether IRMAA raises Medicare premiums, how large future RMDs become, and your flexibility later. There is no universal rule like "always spend taxable first."

The big coordination points most Florida retirees should watch

Social Security taxation thresholds and the "stacking" effect. IRS Publication 915 explains that your "base amount" is $25,000 for single, head of household, or qualifying surviving spouse, and $32,000 for married filing jointly. Up to 85% of benefits can become taxable if the total of one-half of benefits plus other income exceeds $34,000 ($44,000 MFJ).

A deeper policy point: a Congressional Research Service report notes that because the income thresholds used to determine taxation of Social Security benefits are not indexed for inflation or wage growth, the share of beneficiaries affected is expected to increase over time. This is one reason tax planning often feels "more important" later in retirement, not less.

NIIT and investment-income surtax interactions. The IRS explains that a 3.8% NIIT applies above MAGI thresholds (e.g., $250,000 MFJ; $200,000 single or HOH) on the lesser of net investment income or the excess MAGI above the threshold. Even though Roth conversions themselves are not "net investment income," the additional MAGI can push you into NIIT territory where dividends and capital gains in your taxable account face the extra 3.8% tax, making sequencing and gain realization more sensitive in certain income ranges.

RMD timing and first-year bunching. The IRS notes that after your required beginning date, you must withdraw your RMD by December 31 each year, and in the first year, you generally have two distribution deadlines if you delay your first RMD to April 1, creating a potential "two RMDs in one tax year" pileup.

IRMAA's two-year lookback. Because Social Security generally uses tax year 2024 to determine 2026 IRMAA, and uses MAGI from the tax return, your withdrawal sequencing choices today can change Medicare premiums two years from now.

A Florida retiree example that shows the full system

Consider a married couple retiring to Destin, Florida (a common "second act" pattern). They have:

• $1.6M in traditional IRAs and 401(k) rollovers (pre-tax bucket)
• $450k in a taxable brokerage account
• $250k in Roth IRAs
• They plan to claim Social Security at 70, but retire at 66

This is the kind of profile where a Florida move may create a powerful Roth conversion window: without wages, they may have several years where taxable income is relatively low, and Florida's lack of state income tax removes an additional layer of tax cost.

A tax-centric sequencing approach might look like this:

Use the taxable brokerage account for part of spending in the early years to keep ordinary income lower (while intentionally managing capital gains). FamilyVest emphasizes that many households benefit from a blended approach rather than always drawing from one bucket first.

Each year, run a bracket-fill Roth conversion plan with an IRMAA guardrail. For example, they may decide they're comfortable filling up to a chosen federal bracket using the IRS 2026 thresholds as a planning reference, while also keeping projected MAGI under the next IRMAA tier when possible.

Once they reach age 70 1/2, integrate QCDs if they are charitably inclined, especially in years when RMDs and Social Security could otherwise push MAGI into higher IRMAA tiers. IRS Publication 590-B confirms QCD mechanics and that QCDs count toward RMDs.

As RMD age approaches (73 under current IRS guidance), the plan shifts from large conversions to smaller "maintenance conversions" (if any) and tighter MAGI management to reduce the chance of repeated IRMAA surcharges.

The important part is not the exact dollar amounts. It's the system: spending decisions, conversions, charitable giving, and Medicare premiums are evaluated on the same spreadsheet, across multiple years. This is exactly the kind of multi-year lens FamilyVest recommends for avoiding shallow conversion analysis and coordinating retirement income planning with Medicare thresholds.

A simple yearly workflow you can use

If you want a repeatable process (instead of reinventing the wheel every October), here's a clean annual rhythm that matches what the IRS and SSA rules reward:

Project your current-year tax return before conversions and large withdrawals (estimate ordinary income, capital gains, deductions). Use the IRS-published 2026 brackets and standard deduction as a reference for today's bracket-filling conversations.

Project your MAGI and check it against IRMAA tiers two years ahead, because SSA uses prior-year tax return data to set premiums.

Decide whether charitable intent should be implemented using QCDs (if age-eligible) to manage AGI and satisfy RMDs efficiently.

Choose withdrawals (taxable vs. pre-tax vs. Roth) that meet spending needs while preserving optionality for later, particularly once Social Security and RMDs begin stacking.

This is not about being "clever." It's about building a retirement income system where taxes, Medicare premiums, and account rules stop surprising you.

Frequently asked questions

Should I do Roth conversions after moving to Florida?

Often, Florida residency can improve the economics of Roth conversions because Florida is recognized as having no state personal income tax, removing the state tax cost that might apply elsewhere. But Roth conversions still increase federal taxable income in the year of the conversion, and they can raise future Medicare premiums through IRMAA, which is based on federal MAGI.

How do I avoid IRMAA surprises?

Treat IRMAA as a two-year-ahead planning problem. Social Security states that, in 2026, IRMAA generally uses tax year 2024 data and is based on MAGI (AGI + tax-exempt interest). Map planned Roth conversions, capital gains, and RMDs against the official tier table (published by CMS and SSA) to see where you land.

Does Florida change my withdrawal strategy?

It can, because the absence of state income tax means your withdrawal sequencing is often driven more purely by federal brackets, Social Security taxation, IRMAA thresholds, and RMD rules. The underlying sequencing framework still matters: withdrawal order changes Medicare premiums and future RMD pressure.

Should I convert before or after retirement?

Many households find the most "room" for conversions after earned income drops, but before Social Security and RMDs start. FamilyVest notes that conversion windows are often best before Social Security and before RMDs (even though conversions can still be helpful later). The IRS confirms when RMDs begin and how first-year timing can bunch income.

Can I undo a Roth conversion if I change my mind?

Generally, no. The IRS states that conversions to a Roth IRA made on or after January 1, 2018, cannot be recharacterized.

Do Roth IRA withdrawals affect IRMAA?

Qualified Roth IRA distributions are generally not included in federal taxable income, and Social Security's IRMAA MAGI starts with AGI (plus tax-exempt interest). That means Roth withdrawals often help manage MAGI in years when avoiding an IRMAA tier matters. (By contrast, Roth conversions increase AGI and MAGI in the conversion year.)

Do QCDs reduce RMDs and taxes at the same time?

They can. IRS Publication 590-B confirms that QCDs are generally nontaxable IRA distributions made directly to eligible charities, and explicitly notes that a QCD counts toward your required minimum distribution.

How do taxes change in retirement, even in Florida?

Your income sources change (Social Security, IRA distributions, capital gains), and federal rules can cause more of Social Security to become taxable as other income rises. In addition, Medicare premiums can rise through IRMAA based on your federal MAGI, even though Florida does not levy a state personal income tax.