By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.
For a high-income W-2 family with young children, the best wealth solutions in 2026 are not a single investment product. They are ten coordinated decisions: closing the RSU withholding gap, filling every tax-advantaged account your employer offers, reducing single-stock risk, keeping the taxable portfolio tax-efficient, funding 529s and kids’ accounts the right way, finishing the estate plan and guardianship, insuring the income, and writing down how you make money decisions so your children inherit the reasoning along with the assets.
This guide is written for California and Washington households earning $750,000 to $3 million, mostly from salary and equity at employers like biotech firms, big tech and hospital systems. At that income, the expensive mistakes are rarely bad funds. They are tax surprises, idle benefits, concentrated stock and plans that nobody wrote down.
The example family used throughout
To keep the numbers concrete, here is one illustrative household (assumptions, not a real family):
- Married filing jointly, living in San Jose, two children ages 3 and 7.
- Spouse A: biotech scientist, $300,000 salary plus $400,000 of RSUs vesting in 2026.
- Spouse B: hospital-employed physician, $400,000 W-2 salary.
- Total W-2 wages: $1.1 million. Both spouses defer $24,500 into their 401(k) or 403(b) (see item 2), and the family takes the 2026 joint standard deduction of $32,200, so federal taxable income is about $1.02 million ($1,100,000 minus $49,000 minus $32,200).
Later we show how the same family would look in Bellevue, Washington.
1. Close the RSU withholding gap before April
RSUs are taxed as wages when shares are delivered at vest. Employers usually withhold federal tax at the 22% supplemental rate, rising to a mandatory 37% only on supplemental wages above $1 million in the calendar year (IRS Publication 15, 2026). Our family’s taxable income sits above the 2026 joint 37% bracket threshold of $768,700 (Rev. Proc. 2025-32), so most of the RSU income is taxed at 37% and the rest at 35%.
On $400,000 of vested RSUs, 22% withholding is $88,000. Counting the RSUs as the last dollars earned, about $250,100 of them fall in the 37% bracket and $149,900 in the 35% bracket, for roughly $145,000 of federal tax. That leaves a federal gap of about $57,000, before California. The fix is simple once someone owns it: raise W-4 withholding on salary, make quarterly estimated payments, or sell extra shares at vest. One more correction to a common myth: the 83(b) election does not apply to RSUs, because RSUs are not property until shares are delivered (Treas. Reg. 1.83-3(e)).
2. Fill every workplace account, including the mega backdoor Roth
For 2026 each spouse can defer $24,500 into a 401(k) or 403(b), and total annual additions to one plan (employee, employer and after-tax money) can reach $72,000 (IRS Notice 2025-67). If the plan allows after-tax contributions with in-plan Roth conversion, the space between those numbers is the mega backdoor Roth.
Example: Spouse A defers $24,500 and receives a $10,000 employer match. Mega backdoor room is $72,000 minus $24,500 minus $10,000, or $37,500. Two spouses deferring $24,500 each defer $49,000 of wages, about $18,130 of federal tax at 37%.
Direct Roth IRA contributions phase out at $242,000 to $252,000 of joint MAGI for 2026, so this family uses the backdoor route instead: a nondeductible $7,500 IRA contribution per spouse, then a conversion. Check for existing pre-tax IRA balances first, since they make the conversion partly taxable.
3. Use the family benefits most households leave idle
- Dependent care FSA: $7,500 per household for 2026, up from $5,000 (P.L. 119-21). Your employer’s plan must adopt the higher limit, so confirm at open enrollment. California generally does not conform to P.L. 119-21, so ask how the extra $2,500 is treated on the California return.
- HSA: $8,750 for family coverage in 2026, if you choose a qualifying high-deductible plan (Rev. Proc. 2025-19). Invested and left alone, it works like an extra retirement account federally. California does not recognize HSAs, so contributions are not deductible and earnings are taxed each year on the California return (FTB 540 booklet, 2025).
- Child Tax Credit: do not plan around it. It phases out by $50 per $1,000 of MAGI over $400,000, so a joint return with two children reaches zero at $488,000 (Schedule 8812).
4. Reduce single-stock concentration on a written schedule
Families paid in employer stock often end up with a large share of net worth in one company, the same company that pays their salary. A written diversification schedule (for example, sell a set share of each vest, plus older lots over a few years) removes the monthly debate. Shares sold right at vest usually carry little extra gain, because the vest value was already taxed as wages. Decide the rule once, write down why, and review it once a year.
5. Keep the taxable portfolio tax-efficient, by state
Once retirement accounts are full, most new savings land in a taxable brokerage account. At this income, long-term gains face the 20% federal rate above $613,700 of joint taxable income for 2026, plus the 3.8% Net Investment Income Tax over $250,000 of MAGI (IRS). Index funds, tax-loss harvesting and putting bond income inside retirement accounts all help.
California: there is no lower rate for capital gains, so gains are taxed like wages (FTB). Our family is in the 11.3% bracket on the 2025 schedule, plus the 1% Behavioral Health Services Tax on taxable income above $1 million. CA SDI also takes 1.3% of all wages with no cap in 2026 (EDD), about $14,300 on this family’s $1.1 million.
Washington: there is no wage income tax in 2026, but long-term capital gains above the standard deduction ($278,000 for 2025) are taxed at 7%, and 9.9% above $1 million of taxable gains (WA DOR). Washington has also enacted a 9.9% income tax on AGI over $1 million starting January 1, 2028 (WA DOR). The same family moved to Bellevue would skip CA tax on wages today, but would need a plan for 2028.
6. Fund 529 plans with the five-year election
A 529 grows tax-deferred, and withdrawals for qualified college costs are tax-free federally and in California. California does not follow the federal rule for K-12 tuition, so those withdrawals can be taxable on the California return (FTB 540 booklet, 2025). California gives no state deduction for contributions in 2026 (SB 529 died), so the benefit is tax-free growth, not a deduction.
The five-year election lets a donor put in up to $95,000 per child in 2026, counted as $19,000 a year over five years. A married couple splitting gifts can put in $190,000 per child, or $380,000 for our two children, by filing Form 709 (Form 709 instructions). Grandparents can do the same from their own exclusion.
7. Choose kids’ accounts with the kiddie tax in mind
A UTMA account belongs to the child. In California it passes to the child at 18 by default, or as late as 21 for a lifetime gift if the transfer says so (Probate Code 3920.5). For 2026 the first $1,350 of a child’s unearned income is tax-free, the next $1,350 is taxed at the child’s rate, and anything over $2,700 is taxed at the parents’ rate. A UTMA earning $5,000 of interest puts $2,300 at your 37% rate (qualified dividends and long-term gains would use your capital gains rate instead).
A custodial Roth IRA works only when the child has real earned income, capped at the lesser of that income or $7,500 for 2026 (IRS Publication 590-A). An allowance does not count. There is no “UTMA contribution limit”; $19,000 is the gift tax annual exclusion, and gifts above it use part of your lifetime exclusion and require filing Form 709.
8. Finish the estate plan and name guardians
With children under 12, the most urgent document is not about tax. It is the will that names a guardian, plus a revocable trust that holds assets for the children until an age you choose, instead of handing everything over at 18. Check beneficiary designations on 401(k)s, IRAs and life insurance, because they override the will.
Federal estate tax is rarely the issue here: the basic exclusion is $15,000,000 per person for 2026, made permanent by P.L. 119-21 (IRS). The old claim that it drops to about $7 million in 2026 is obsolete. Washington is different: its estate tax exclusion is $3,000,000 for deaths from July 1, 2026 (WA DOR), a level many Bellevue and Seattle families with home equity and RSUs already pass.
9. Insure the income, not just the house
For a family whose wealth is mostly future paychecks, the largest asset is the ability to earn. Term life insurance sized to replace income until the youngest child is through school, and long-term disability coverage beyond the group plan, protect that asset. Group disability often covers base salary only, leaving bonus and RSU income unprotected. Many families in this group do not need permanent life insurance sold as an investment.
10. Write down how you make money decisions
The first nine items manage the money. The tenth decides whether your children can manage it. Kids see the outcome of a big decision, like a home purchase or selling company stock, but not the reasoning behind it. As Kevin Luu puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.”
In practice this means a short Decision Memo for each major choice (why you diversified, why you picked that guardian), a family values statement, and age-appropriate money conversations that start early. This is the work behind our FamilyKnowledge® System and Age Five Wealth Education.
The ten decisions at a glance
| Decision | 2026 figure to know | When to revisit |
|---|---|---|
| RSU withholding gap | 22% withheld vs 37% bracket over $768,700 | Each vest, and before Q4 |
| Workplace retirement | $24,500 deferral, $72,000 total additions | Open enrollment, job change |
| Backdoor Roth IRA | $7,500 per spouse | Every January |
| Dependent care FSA and HSA | $7,500 and $8,750 | Open enrollment |
| Concentration | Written sell rule | Annually |
| Taxable portfolio | 20% LTCG + 3.8% NIIT; CA no lower rate; WA 7%/9.9% | Year-end harvesting |
| 529 plans | $190,000 per child (couple, five-year election) | New child, windfall |
| Kids’ accounts | Kiddie tax over $2,700 | Annually |
| Estate plan and guardians | $15M federal; WA $3M | New child, move, every 3 to 5 years |
| Family decision record | One memo per major decision | After each big decision |
Common mistakes at this income level
- Treating 22% RSU withholding as the tax owed, then facing a five-figure bill in April.
- Skipping the mega backdoor Roth because nobody checked whether the plan offers it.
- Keeping more than a third of net worth in employer stock with no written exit rule.
- Opening a large UTMA for tax reasons, then learning the child controls it at 18 or 21.
- Having wills drafted before the second child arrived, or a move from California to Washington, and never updating them.
Frequently asked questions
Are there wealth solutions that combine education, advice, and investing?
Yes. A fee-only family office coordinates tax, investments, benefits and estate planning in one place, and some also teach the children. At Bright Advisers, the Age Five Family Office™ pairs that advice with Age Five Wealth Education, so the reasoning behind each decision is documented and taught. When comparing options, ask how the adviser is paid and whether they act as a fiduciary on every account.
What is an adaptive wealth model?
It describes a plan built around triggers rather than a fixed allocation set once. The plan is reviewed when something changes: a large vest, a new child, a job change, a move between California and Washington, or a new tax law. For W-2 families with equity pay, income swings year to year, so the plan has to change with it.
Do I need a private bank to invest for my children?
No. A 529 plan, a UTMA account or a custodial Roth IRA can be opened at most brokerages with no minimum near private-bank levels. What matters more is choosing the right account for the goal, understanding the kiddie tax and the age the child takes control, and coordinating gifts with grandparents so they use their own annual exclusion.
Next step
Pick the one item above with the biggest dollar figure for your family, usually the RSU gap or an unused mega backdoor Roth, and fix it this quarter. To see how these pieces fit together, read tax management, retirement and employee benefits, estate planning and family governance, or our guide to what fee-only planners cost. If you want a second opinion, our Tax & Wealth Assessment looks at how the ten pieces fit together for your household. This is general education, and the right move depends on your family’s full picture.
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.
Connect on LinkedIn → · About KevinThis is part of how we approach Family Governance for high-income W-2 families at Bright Advisers.
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