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M03 · Module 3 of 11

Tax-advantaged accounts

Tax-advantaged accounts are the most reliable way a high earner can keep more of what they save, because they change how investment growth is taxed rather than betting on which investments to pick. This module covers the main accounts available to you, how their tax treatment differs, and the one decision that matters most: whether to save in a pre-tax or a Roth form.

What you’ll take away

  • How pre-tax, Roth, and taxable treatment each work, and why the difference compounds over decades.
  • Which accounts offer which treatment: 401(k)/403(b), traditional and Roth IRAs, and the HSA.
  • A clear way to decide between Roth and traditional, starting with your tax rate now versus later.
  • Why the HSA is the single most underused account among high earners.
  • How a business owner’s relationship to these accounts differs from an employee’s.

What “tax-advantaged” actually buys you

A normal taxable brokerage account is taxed twice over its life. You fund it with money that has already been taxed as income, and then you pay tax again on the dividends and capital gains it produces along the way. Every dividend reinvested, every fund that rebalances and sells a winner, every position you trim creates a taxable event. That ongoing drag is small in any single year and large over thirty.

A tax-advantaged account removes one or both of those layers. There are two distinct mechanics, and keeping them separate is the foundation for everything that follows.

The first mechanic is a deduction now. You contribute pre-tax dollars, the money grows without annual tax on dividends or gains, and you pay ordinary income tax only when you withdraw in retirement. You are deferring the tax bill to a later year.

The second mechanic is tax-free growth. You contribute dollars that have already been taxed, the money grows without any annual tax, and qualified withdrawals come out completely tax-free. You pay the tax up front and never again.

Both mechanics share the middle benefit: no tax on growth while the money compounds. That middle benefit is what makes these accounts valuable regardless of which form you choose. A dollar that compounds untaxed for thirty years ends up meaningfully larger than the same dollar compounding in a taxable account, where a slice gets shaved off the return every year. For a high earner in a top bracket, that annual slice is at its largest, so the value of sheltering growth is at its largest too.

Pre-tax, Roth, and the accounts that offer each

Three tax treatments cover almost everything you will encounter.

Pre-tax (also called traditional or tax-deferred). Contributions reduce your taxable income this year. Growth is untaxed. Withdrawals in retirement are taxed as ordinary income. You get the deduction up front and settle with the government later.

Roth. Contributions give you no deduction today. Growth is untaxed. Qualified withdrawals in retirement are entirely tax-free. You pay tax up front and the account is then permanently out of the tax system.

Taxable. No special treatment on contributions, ongoing tax on dividends and realized gains, and capital-gains tax when you sell. This is your regular brokerage account, and it is where money goes once the advantaged accounts are full.

Here is where each account lands.

401(k) and 403(b). These are employer-sponsored plans. A 403(b) is the version offered by schools, hospitals, and nonprofits; it works like a 401(k) for these purposes. You contribute through payroll up to the annual employee deferral limit, currently capped at $24,500 (2026), $23,500 (2025), with an additional catch-up amount of $8,000 (2026), $7,500 (2025) once you reach the catch-up age. Most plans now offer both a pre-tax and a Roth option for your own contributions, so you choose the treatment. Many employers also match some of your contributions, which is a return on your savings that no investment can reliably match. Employer matching dollars generally go in pre-tax even when your own contributions are Roth.

Traditional and Roth IRAs. These are individual accounts you open yourself, outside any employer. The combined annual contribution limit across both is $7,500 (2026), $7,000 (2025), with a catch-up of $1,100 (2026), $1,000 (2025) at the catch-up age. Two features matter for high earners specifically. The deduction for a traditional IRA phases out at higher incomes when you are also covered by a workplace plan, so a high W-2 earner often gets no deduction for a traditional IRA contribution. Direct Roth IRA contributions phase out entirely above an income threshold, currently $242,000 (2026), $236,000 (2025) for married filers, which means many readers of this module cannot contribute to a Roth IRA the ordinary way at all. That blocked door has a well-known workaround, and the mechanics of getting money into a Roth once your income is too high are covered in what to do once your income blocks direct Roth contributions.

HSA (Health Savings Account). Available only if you are enrolled in a qualifying high-deductible health plan, the HSA gets its own section below because its tax treatment is better than anything else on this list.

The practical takeaway is that your 401(k) and your IRA each let you pick pre-tax or Roth. That choice is the same decision in both places, and it is the next section.

Roth or traditional: start with your rate now versus later

One question drives this decision more than any other. Will your tax rate be higher in the year you contribute, or in the year you withdraw?

The arithmetic is clean. A pre-tax contribution is taxed at your rate in retirement. A Roth contribution is taxed at your rate today. If those two rates were identical, the two accounts would produce the exact same after-tax wealth, dollar for dollar. The accounts differ only because the rates differ. So the entire decision reduces to comparing one rate against the other.

For a high earner in peak earning years, the comparison usually points one way. Right now you are likely paying tax at or near the top marginal rates, with the full stack of surtaxes that come with a large income sitting on top. In retirement, with no salary, your income is generally lower, you control the timing of withdrawals, and you fill the lower brackets first before reaching into the high ones. When your rate today is higher than your expected rate later, the pre-tax contribution wins: you take the deduction at your expensive top rate now and pay tax at a cheaper rate later. This is why traditional contributions tend to suit people at the height of a high-income career.

The input you need to run this comparison is your true marginal rate today, which for a high earner is rarely just your federal bracket. It includes state tax, the surtaxes that stack on high incomes, and any phaseout you happen to be sitting inside. Getting that number right is the whole job of your current marginal rate, the first input to the Roth decision, and you should treat its output as the “rate now” side of this equation.

The exceptions are worth naming, because they do apply to some high earners. Early in a career, before income peaks, your current rate may be lower than your eventual retirement rate, and Roth contributions make sense then. If you expect to accumulate so much in pre-tax accounts that required minimum distributions will push you back into high brackets in retirement, some Roth balance hedges that. And a Roth has no required minimum distributions during your lifetime, which makes it a strong vehicle for money you intend to leave to heirs rather than spend.

That last set of reasons points to a secondary frame, and it is genuinely secondary: diversifying your tax-rate risk. Nobody knows what tax rates or tax law will look like in thirty years. Holding some pre-tax and some Roth gives you balances taxed under different rules, so a future change in either direction touches only part of your savings, and gives you withdrawal flexibility to manage your bracket year by year in retirement. This is a reasonable tie-breaker once the rate-now-versus-later analysis is close, or a reason to keep some money in each bucket rather than going all-in on one. It is not the lead reason. Lead with your rates. Use diversification to round the decision, not to make it.

Because the answer depends entirely on two numbers you have to estimate, this is a place to model rather than guess. The Roth vs traditional simulator compares the lifetime after-tax outcome of each path using your own rate assumptions, so you can see how sensitive the answer is to what you expect your retirement rate to be. Where the choice turns into a personal decision about your specific situation, that is where a CFP comes in.

Why an HSA is the account most high earners underuse

An HSA is the only account that is tax-advantaged on all three sides at once. Contributions are deductible going in. Growth is untaxed while it sits. Withdrawals are tax-free when used for qualified medical expenses. No other account gives you all three. A pre-tax 401(k) taxes the withdrawal; a Roth taxes the contribution; the HSA taxes neither.

The annual contribution limit is $8,750 (2026), $8,550 (2025) for family coverage and $4,400 (2026), $4,300 (2025) for individual coverage, with an extra catch-up of $1,000 (2025 and 2026) once you reach the HSA catch-up age. You can contribute only while enrolled in a qualifying high-deductible health plan, but money already in the account stays yours and keeps its tax treatment for life, even after you switch plans or leave a job.

High earners underuse it for a predictable reason. The account is marketed as a way to pay this year’s medical bills, so people spend out of it as fast as they fund it and treat it like a checking account for copays. The far stronger move for someone who can cover current medical costs out of regular cash flow is to invest the HSA balance, leave it untouched, and let three decades of tax-free compounding run. Many HSAs let you invest the balance in the same kinds of funds as a 401(k) once you clear a small cash minimum. Used this way, the HSA behaves like a retirement account with better tax treatment than any other you hold.

This module keeps the HSA at the level of the concept: triple tax-free, fund it, invest it, leave it. The full lifetime-value case, including how large an untouched HSA can grow and how the medical-expense rules let you reimburse yourself years later, is its own exercise. The HSA lifetime-value calculator models the account as a stealth retirement vehicle so you can see the size of the opportunity in your own numbers.

For business owners: you pick the plan

Everything above assumes the accounts are handed to you. An employee contributes to whatever 401(k) the employer set up, with whatever match and whatever features that plan happens to include. A business owner is in a different position, and it changes how you read this module.

As an owner, you are not just a participant in a retirement plan. You are the sponsor. You decide whether the business has a plan at all, which kind, and how it is designed. That choice is consequential, because the available structures differ enormously in how much they let you shelter. A solo 401(k), a SEP-IRA, and a defined-benefit or cash-balance plan are built for different situations, and the right one depends on your income, your age, and whether you have employees. A well-chosen plan can let an owner shelter far more per year than the standard employee deferral limit that caps a W-2 employee.

The pre-tax-versus-Roth decision from this module still applies to your own contributions inside whatever plan you sponsor; that logic does not change. What changes is that you also own the prior decision of what plan exists in the first place, and that decision is its own subject. Choosing and designing a retirement plan as an owner, including which structures shelter the most and how matching and contributions interact with any employees you have, is covered in designing a retirement plan as a business owner.

Putting it together

Tax-advantaged accounts work by removing the annual tax drag that quietly erodes a taxable account, and that benefit is largest for a high earner in a top bracket. Within those accounts, the central choice is pre-tax versus Roth, and you make it by comparing your tax rate now against your expected rate in retirement; for someone at peak earnings, that usually favors pre-tax, with tax-rate diversification as a secondary consideration rather than the headline. The HSA sits above all of this as the only triple-tax-free account, best used as a long-term investment rather than a spending account. And if you own a business, you choose and design the plan rather than simply filling one out, which opens up far more room than an employee has.

Connections

This module explains how these strategies work. For what to do in your own situation, the platform hands off to a CFP.