The Best Pre-Tax Investments for High-Income Families in 2026

By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.

The best pre-tax investments for a high-income W-2 family are the ones your paycheck already offers: 401(k) or 403(b) elective deferrals ($24,500 per spouse for 2026), a family HSA if you are on a qualifying high-deductible plan ($8,750 for 2026), and the dependent care FSA ($7,500 per household for 2026, if your employer adopted the new limit). Together they can move about $65,000 a year out of a dual-income household’s taxable wages. Roth IRAs, 529 plans and municipal bonds are useful, but they are not pre-tax: you fund them with money that has already been taxed.

That distinction matters more at $750,000 to $3 million of household income than at any other level, because every pre-tax dollar comes off the top of your income, where federal and California rates are highest. This guide covers what counts as pre-tax, how each account is treated in California and Washington, a worked example for a $900,000 household, and the after-tax accounts worth filling once the pre-tax ones are full.

What “pre-tax” means, and why the original list gets it wrong

A pre-tax contribution is excluded from your taxable wages in the year you make it. Your W-2 box 1 is lower, so your income tax is lower. You pay tax later, when the money comes out (traditional 401(k)), or never, if it is spent on a qualifying expense (HSA for medical costs, dependent care FSA for childcare).

Many lists of “pre-tax investments” mix in accounts that work differently:

• Roth IRA and Roth 401(k): funded with after-tax money. The benefit is tax-free growth and withdrawals later, not a deduction now. For 2026, direct Roth IRA contributions phase out at $242,000 to $252,000 of MAGI for joint filers, so most families reading this cannot contribute directly at all.
• Traditional IRA: a deduction is only available if neither spouse has a workplace plan, or your income is low enough. For 2026 the deduction phases out at $129,000 to $149,000 of MAGI (joint) when the contributor is covered by a plan. At $750,000 or more, with either spouse covered by a workplace plan, a traditional IRA contribution is non-deductible.
• 529 plans: contributions are after-tax. California gives no state deduction for 529 contributions. The benefit is tax-free growth for qualified education costs.
• Municipal bonds: you buy them with after-tax money. The interest is generally exempt from federal income tax (IRS Publication 550), but California taxes interest from other states’ bonds, so a California resident needs California bonds or a fund that meets the state’s 50% rule to get the state exemption (FTB Schedule CA instructions).

The pre-tax accounts a high-income W-2 family can use in 2026

Limits are from IRS Notice 2025-67 (retirement plans), Rev. Proc. 2025-19 (HSA), Rev. Proc. 2025-32 (health FSA, commuter) and P.L. 119-21 section 70404 (dependent care FSA).

401(k) and 403(b) deferrals: the largest lever

Each working spouse can defer $24,500 for 2026. If both of you max out, that is $49,000 off your taxable wages. One detail for families over 50: if your 2025 FICA wages from the employer were above $150,000, your 2026 catch-up contributions must go in as Roth, so the catch-up is no longer a pre-tax lever for most of this audience.

Deferrals reduce income tax, not payroll tax. Social Security (up to the $184,500 wage base for 2026), Medicare, the 0.9% Additional Medicare Tax and California’s 1.3% SDI still apply to deferred wages (IRS Publication 15).

The HSA: strongest federally, weaker in California

Federally, an HSA is the only account that is deductible going in, grows tax-free, and comes out tax-free for medical expenses. When you contribute through payroll (a cafeteria plan), contributions also skip Social Security and Medicare tax (IRS Publication 15-B). Many families pay medical bills from cash flow, keep the receipts, and let the HSA stay invested for decades.

California does not conform. The FTB instructions say plainly that California law does not allow the HSA deduction, employer HSA contributions (W-2 box 12, code W) are added back to California income, and interest or earnings inside the HSA are taxable in California in the year earned. California families should still use the HSA for the federal benefit, but should expect a small California tax bill on the account’s dividends each year. Whether an HDHP is the right medical plan for a family with young children is a separate question; our guide to high-deductible health plans for families covers it.

The dependent care FSA: small, but nearly every family with under-12s qualifies

For 2026 the household limit rose from $5,000 to $7,500, but only if your employer’s plan adopted the higher amount. At this income the child and dependent care credit is small, so the FSA is usually the better use of childcare costs. Two cautions: the limit is per household, not per spouse, so do not elect $7,500 at both employers; and because California generally does not conform to the 2025 federal tax law (FTB 540 booklet), ask your tax preparer whether the extra $2,500 is excluded for California purposes.

Deferred compensation: only after the qualified accounts

Some employers let senior staff defer salary or bonus into a nonqualified plan. It can defer a large amount, but the money remains an unsecured promise from your employer, payout dates are usually locked when you elect, and it cannot be rolled into an IRA. It makes most sense when the employer is financially strong, your income is likely to fall later, and you are already filling your 401(k) and HSA.

Worked example: a $900,000 California household

Assumptions (illustrative): a married couple in San Mateo County, both W-2 employees, $900,000 combined wages, two children aged 3 and 6, filing jointly, taking the $32,200 standard deduction for simplicity, family HDHP coverage, and an employer plan that adopted the $7,500 dependent care limit.

1. Pre-tax contributions: $24,500 + $24,500 (401(k)s) + $8,750 (HSA) + $7,500 (dependent care FSA) = $65,250.
2. Federal taxable income: $900,000 minus $32,200 = $867,800 without contributions; $802,550 with them. Both are above the 2026 joint 37% bracket threshold of $768,700, so every dollar comes off at 37%.
3. Federal income tax saved: $65,250 x 37% = $24,142.50. The HSA and dependent care FSA, both run through payroll, also skip 2.35% Medicare tax (1.45% + 0.9%) on $16,250, about $382.
4. California: 2026 California brackets are not yet published, so we use 2025. Assume about $860,000 of California taxable income before contributions, in the 10.3% bracket ($742,958 to $891,542 for joint filers). The 401(k) deferrals come off at 10.3%: $49,000 x 10.3% = $5,047. The HSA saves nothing for California, and we leave the dependent care FSA out of the California figure because its 2026 California treatment is not confirmed.
5. Combined first-year saving: roughly $29,190 in income tax on $65,250 put aside, before any investment growth.

The same family in Seattle saves the same $24,142.50 federally but nothing at the state level in 2026, because Washington has no wage income tax. That changes in 2028: Washington has enacted a 9.9% tax on individual and joint filers with AGI over $1,000,000, effective January 1, 2028 (WA Department of Revenue). The income definition is still pending DOR guidance, but a Washington household near $1 million may find pre-tax deferrals become more valuable from 2028.

After the pre-tax accounts: the next three places for money

Once the pre-tax accounts are full, the question is which after-tax account gives the most for the next dollar. For most families in this income range the order looks like this:

1. Mega backdoor Roth (if the plan allows it). For 2026, total additions to a 401(k) can reach $72,000 per person, not counting catch-ups. If you defer $24,500 and your employer adds $12,000 (an assumption), the room left is $72,000 – $24,500 – $12,000 = $35,500 of after-tax contributions, which some plans let you convert to Roth right away. For two spouses with this feature, that is up to $71,000 a year of future tax-free growth. Ask HR whether your plan allows after-tax contributions and in-plan conversions; availability varies widely by employer.
2. Backdoor Roth IRA. Each spouse contributes $7,500 (2026) to a non-deductible traditional IRA and converts it. If a spouse has pre-tax money in any traditional, SEP or SIMPLE IRA, the pro-rata rule on Form 8606 makes part of that spouse’s conversion taxable, so check balances first. Our guide on withdrawing non-deductible IRA contributions explains the basis tracking.
3. 529 plans for the children. No California deduction, but growth is tax-free for qualified education costs. Grandparents and parents can front-load up to $95,000 per donor per child (5 x the $19,000 2026 gift exclusion, $190,000 for a couple splitting gifts) with a Form 709 election (Form 709 instructions). One California wrinkle: the federal 529-to-Roth IRA rollover is included in California taxable income and subject to an additional 2.5% California tax, because California does not conform (FTB Schedule CA instructions).

A taxable brokerage account comes after these. In California, long-term gains are taxed as ordinary income with no lower rate, so tax-efficient funds and holding periods matter more than they do in Washington.

Common mistakes we see at this income

• Electing $7,500 of dependent care FSA at both jobs. The limit is per household; the excess becomes taxable.
• Contributing to a traditional IRA and expecting a deduction. With a workplace plan and $750,000 of income, it is non-deductible. Use it only as the first step of a backdoor Roth.
• Front-loading the 401(k) and losing match. If your plan matches per paycheck and has no “true-up”, maxing out by June can forfeit employer money in the second half of the year.
• Ignoring the HSA’s California tax. The state tax on HSA dividends is small but it is reported on Schedule CA every year.
• Counting a muni fund as tax-free in California when most of its bonds are from other states.

The decision to make this year, and what to write down

The decision is rarely “which investment”. It is how much of your pay goes into each account by default, set once at open enrollment and revisited when income or plan rules change. Write a one-page note for your family file: which accounts you fund, in what order, the amounts, and why. When your children are old enough, that note shows them a habit (pay the pre-tax accounts first, then the Roth accounts, then the rest) rather than just a balance. As Kevin Luu puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.” For how families turn notes like this into lessons, see Age Five Wealth Education.

Frequently asked questions

Is a Roth IRA a pre-tax investment?

No. Roth IRA contributions are made with after-tax money and give no deduction. Their value is that qualified withdrawals, including growth, are tax-free later. For 2026, joint filers with MAGI above $252,000 cannot contribute directly, which is why high-income families use the backdoor Roth IRA (non-deductible contribution, then conversion) or a mega backdoor Roth inside the 401(k).

Do pre-tax 401(k) contributions lower Social Security and Medicare tax?

No. Elective deferrals reduce federal and state income tax, but Social Security, Medicare and California SDI are still withheld on those wages. HSA and dependent care FSA contributions made through a cafeteria plan are different: they are also excluded from Social Security and Medicare wages, which is why they are worth slightly more per dollar.

Should we choose Roth 401(k) instead of pre-tax at our income?

At a 37% federal rate (plus 10.3% or more in California), pre-tax deferrals often come out ahead, because many families expect a lower rate in retirement. Roth deferrals can make sense in a lower-income year, such as a sabbatical or a year with one spouse home. Many families split: pre-tax deferrals plus mega backdoor Roth.

Next step

Pull your last pay stub and your benefits summary, and check four numbers: 401(k) deferral rate, HSA election, dependent care election, and whether your plan allows after-tax contributions. If you want a second set of eyes on how these fit with RSUs, the children’s accounts and your estate plan, our tax management and retirement and employee benefits work starts with a Tax & Wealth Assessment. Related: how to reduce modified adjusted gross income.

This is general education, and the right move depends on the family’s full picture.

Written by

Kevin Luu

Co-Founder and Chief Learning Officer, Bright Advisers

Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.

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