E108: How Retirement Rewrites Your Taxes

A W-2 paycheck takes care of taxes without much say from you. Federal, state, and payroll tax all come out automatically, and by the time April rolls around, the guesswork is mostly done. A CRNA or nurse practitioner who’s built a career this way has rarely had reason to think about taxes at all. Once you stop working, none of that happens on its own anymore.

A Different Set of Rules

A 40-year career is the assumption baked into most financial advice. A CRNA or nurse practitioner’s high-earning years often run closer to 15 or 20, and retirement tends to arrive earlier too, leaving a long stretch, sometimes a decade or more, of managing an entirely new tax picture on your own before Social Security, Medicare, or required minimum distributions show up.

What Disappears, and What Steps In

The payroll tax, sometimes called FICA, is one of the few things that simply goes away. It’s 6.2% for Social Security on wages up to $184,500 in 2026 and an uncapped 1.45% for Medicare, both matched dollar for dollar by an employer. Once the paycheck stops, so does the tax, and so does the employer who used to manage it.

A mix of income sources takes its place instead, each taxed on its own terms, and none of it withheld unless requested. The distinction to understand first is ordinary income versus capital gains, since nearly everything else in retirement tax planning builds on it. Ordinary income runs on a bracket system from 10% up to 37% in 2026, after a standard deduction of $16,100 for a single filer or $32,200 for a married couple filing jointly. Long-term capital gains and qualified dividends get their own, lower brackets, 0%, 15%, or 20%, depending on taxable income and filing status.

How Each Income Source Gets Taxed

Social Security is the one most people assume works simply, but up to 85% of a benefit can end up included in taxable income. Included, not taxed, at 85%, meaning that share gets added to other income before ordinary rates apply. On $40,000 in annual benefits, that’s as much as $34,000 added to taxable income if other income pushes into the top inclusion range. Some states don’t tax Social Security at all, a detail to factor in if a move is part of the retirement plan.

Traditional 403(b), 401(k), and IRA withdrawals are fully taxable at ordinary rates, since no tax was paid going in. The deduction taken each year on those contributions functioned more like a deferral than a discount, and the bill comes due on withdrawal. Roth accounts work differently, since qualified distributions come out completely tax-free, both contributions and growth. The years between early retirement and required minimum distributions, sometimes a 10 to 15 year window, tend to be the cheapest years to convert money from a traditional account into a Roth.

Interest income depends on the source. Savings accounts, CDs, and corporate bonds are taxed at the ordinary federal rate, and usually at the state level too. Treasury bond interest is exempt from state tax. Municipal bond interest is generally exempt from federal tax, and sometimes state tax too, though holding municipal bonds inside a retirement account usually cancels out that benefit since the tax-free treatment already exists there. Dividends split into two categories, and qualified dividends get the lower capital gains rates, while non-qualified dividends are taxed at the ordinary rate.

Capital gains follow their own split. An investment held a year or less and then sold is taxed as a short-term gain at the ordinary rate. Held longer than a year, it becomes a long-term gain, taxed at the lower capital gains brackets instead, which is also why a mutual fund or ETF’s internal trading activity matters. Frequent trading inside the fund can pass short-term gains through to an investor regardless of how long they personally held their shares. Rental property income is taxed at ordinary rates too, but only on the net amount after mortgage interest, property taxes, operating costs, and depreciation are subtracted out.

Two Extra Costs That Function Like Taxes

Two additional pieces don’t look like traditional taxes but function like them. The net investment income tax adds a 3.8% surtax on investment income once modified adjusted gross income crosses $200,000 for a single filer or $250,000 for a married couple filing jointly, and that threshold isn’t adjusted for inflation.

The Medicare IRMAA surcharge raises Part B and Part D premiums once income crosses roughly $109,000 for a single filer or $218,000 for a married couple filing jointly, based on a tax return from two years prior. In 2026, the standard Part B premium is $202.90 a month, and it can climb to $689.90 a month at the highest income tier. The income that triggers a higher tier, like a large Roth conversion or capital gain, may have happened two years before the higher premium shows up.

Nothing Withholds Automatically

Nothing withholds automatically from any of these income sources unless specifically requested. A 403(b) or IRA distribution can have taxes withheld if elected. Social Security withholding is optional and easy to overlook. A taxable brokerage account or rental property won’t withhold anything at all, which leaves the responsibility for paying enough tax throughout the year, through withholding elections or quarterly estimated payments, with the retiree. Skipping this step can lead to a tax-time surprise along with an underpayment penalty.

A Hypothetical Withdrawal Order

Consider a hypothetical 58-year-old nurse practitioner who spent her career on staff at two hospital systems. She has a 403(b) built mostly through payroll deductions and an employer match, a small pension from her first employer, a Roth IRA she’s contributed to for a decade, a modest taxable brokerage account, and Social Security she hasn’t claimed yet, built on a long, continuous earnings record.

Deciding which account to draw from first, and in what order, matters more than the total she’s saved. Pulling too much from the 403(b) or pension in a single year could push her into a higher tax bracket, trigger the net investment income tax, and set up an IRMAA surcharge two years later. Pulling from the Roth or brokerage account first in some years could keep taxable income lower and create room for smaller strategic Roth conversions, filling the lower tax brackets without spilling into the higher ones. There’s no universal answer here. It depends on her full financial picture, her spending needs, and when she plans to claim Social Security. This example is for illustration only, not individual advice, and working with a qualified tax professional or financial planner is generally a good idea given how quickly these pieces interact.

Awareness, Not Perfection

Retirement multiplies the number of moving pieces in a tax return while handing over more control than a W-2 paycheck ever offered. A fixed paycheck meant automatic withholding and a tax bill mostly settled before the W-2 statement arrived. Now there’s a choice in which account to pull from, when to convert traditional funds to Roth, how much income to realize in a given year, and when to start claiming Social Security, an advantage that only pays off for someone who understands the rules well enough to use it.

Pulling together a simple list of every account held, traditional, Roth, taxable, and any pension, along with roughly how much sits in each one, is the starting point for a conversation about withdrawal order, Roth conversions, or tax bracket management. It’s not a complicated exercise, but it’s the kind of thing that’s easy to keep putting off.

This content is for educational purposes only and isn’t personalized investment, tax, or financial advice. The tax brackets, thresholds, and premium figures cited above reflect 2026 amounts referenced in the episode. [Note for compliance: this episode is dense with specific IRS and Medicare figures, standard deduction amounts, capital gains brackets, NIIT and IRMAA thresholds, and 2026 Part B premiums, all of which should be reviewed for accuracy before publishing.]

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