Best Tools for Family Financial Planning at High Incomes

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

The best tools for family financial planning, for a household earning $750k to $3M, are usually three simple ones used together: an account aggregator that shows net worth in one place, a projection tool for “what if” questions, and a shared, organized record of the family’s documents and decisions. No consumer app we know of correctly models how RSU income, California or Washington tax, and a family’s own values fit together, so software can show you the numbers, but a person still has to make and write down the decisions.

This guide explains what each type of tool does well, where it breaks for a high-income W-2 family with young children, and a worked example of the most common gap: RSU tax that the apps show as “paid” when it is not.

Why off-the-shelf planning apps fall short at $750k and up

Most budgeting and planning apps are built for households whose main question is “where did my paycheck go?” A family with two professional incomes, quarterly RSU vests, an ESPP, a mega backdoor Roth option and two kids in preschool has different questions:

• How much will we owe in April, given that vesting shares were withheld at a flat rate?
• How concentrated are we in one employer’s stock across RSUs, ESPP shares and 401(k)?
• If one of us steps back from work for three years, can we still fund the 529s and the house?
• Who raises the kids, and who manages their money, if something happens to both of us?

Apps are good at the first half of each question (collecting balances) and weak at the second half (the tax rules and the judgment). That split is the useful way to think about tools.

The three kinds of tools, and where each one breaks

A fourth category, the stock plan portal from your employer’s equity administrator, is where grant, vest and sale records actually live. Treat it as the source of truth for share counts and cost basis, and reconcile the other tools to it at least once a year.

Worked example: the RSU tax gap most apps miss

Assumptions, for 2026: a married couple filing jointly in San Jose. Combined salaries of $500,000 and $400,000 of RSU income that vests during the year, for $900,000 of total wages. Each spouse defers the full $24,500 into a 401(k). For simplicity they take the $32,200 standard deduction and have no other income. The figures below are federal income tax only; they leave out the 0.9% Additional Medicare Tax and state tax.

1. Taxable income from salary: $500,000 minus $49,000 of 401(k) deferrals minus $32,200 = $418,800.
2. The $400,000 of RSU income stacks on top, taking taxable income to $818,800.
3. Federal tax on that RSU slice using the 2026 brackets: $93,650 at 32% ($29,968), $256,250 at 35% ($89,687.50) and $50,100 at 37% ($18,537), for $138,192.50.
4. Federal withholding at vest: if the employer uses the 22% optional flat rate for supplemental wages described in IRS Publication 15, $400,000 x 22% = $88,000.
5. Gap: about $50,000 of federal income tax still owed, before state tax.

An aggregator typically shows the full after-withholding share value as part of net worth. A household reading that dashboard in October may feel $50,000 richer than it is, then face a large April bill and possibly an underpayment penalty. (If supplemental wages from one employer pass $1,000,000 in a calendar year, withholding on the excess is 37%, which narrows the gap.)

California adds its own layer. RSU income is taxed as ordinary income, the top bracket for 2025 is 12.3%, and a further 1% applies to taxable income over $1,000,000, per the FTB 2025 rate schedules. CA SDI is withheld at 1.3% of all wages for 2026 with no wage cap (EDD), which is $11,700 on $900,000 of wages. California also has no lower rate for long-term capital gains, so selling vested shares later is taxed at ordinary rates.

The same family in Bellevue pays no Washington income tax on wages for 2026. But for 2026 Washington taxes long-term capital gains at 7%, and 9.9% on taxable gains above $1,000,000 (WA DOR), after an annual standard deduction. That matters if they hold shares past a year and then sell a large block. Washington has also enacted a 9.9% income tax on AGI over $1,000,000 starting January 1, 2028 (WA DOR), so a projection that runs past 2027 with no Washington income tax is already out of date for households at that income.

No general-purpose app we know of does all of this automatically. A projection is only as good as the tax assumptions typed into it.

How to choose tools without adding another chore

For a family that would rather delegate than tinker, the test is simple: will this tool still be accurate in six months with almost no upkeep from you? A short checklist:

• Equity handling. Can it separate unvested grants, vested shares and the tax owed on them? If not, keep equity out of it and track it from the stock plan portal.
• State tax inputs. Can you set California or Washington rules, including the WA income tax from 2028, or at least override the tax rate?
• Two-spouse access. Both partners should be able to see everything without sharing one login.
• A “break glass” contact. Can a named adult (a guardian, a sibling, an executor) get read access if both parents are unavailable?
• Exit. Can you export your data and documents if the company changes pricing or shuts down?
• Security. Two-factor login, and read-only account connections wherever possible.

Most families need one aggregator, one place for documents, and scenario modeling done a few times a year, often by the person advising them rather than by the family. Paying for five overlapping apps rarely changes a decision.

What software cannot do: intergenerational planning

People search for “the best platforms for intergenerational planning” hoping one tool can pass wealth down well. Software can store the will, the trust, the beneficiary designations and the account list. It cannot record why you chose a particular guardian, what you want the money to teach, or how you decided between paying for private school and funding a 529.

That missing piece is the real risk for families at this income. Children can inherit a well-organized vault and still have no idea how their parents thought about money, work or giving. The fix is low-tech: a short written note for each big decision, what you chose, what you considered, and why, stored next to the legal documents. We call this a Decision Memo, and it is the core of the FamilyKnowledge® System. Conversations fade. Documentation compounds.

Two or three memos a year is enough. Good first topics: your guardian choice, how you plan to handle the kids’ first paychecks, and your rule for how much company stock you are willing to hold.

Common mistakes with planning software

• Treating withholding as tax paid. As the example shows, 22% withheld on RSUs is often well short of what a family in the 35% or 37% federal bracket owes.
• Double-counting employer stock. RSUs, ESPP shares and a company stock fund in the 401(k) can all show up in separate places, hiding how concentrated you are.
• Stale projections. A plan built on pre-2025 tax law may assume federal rates rise in 2026. They did not: the current rates were made permanent in 2025.
• One-spouse systems. If only one parent knows the logins and the logic, the tool fails exactly when it is needed most.
• Missing benefit elections. Apps rarely prompt you to use the $7,500 household dependent care FSA limit for 2026 (if your employer’s plan has adopted it) or to review a mega backdoor Roth option during open enrollment.

Frequently asked questions

Do we need financial planning software if we work with an adviser?

Usually you need less of it. An adviser typically runs projections and tax scenarios in professional software. The family still benefits from one aggregator for day-to-day visibility and one shared document vault. The adviser’s job is to check the tax assumptions and turn the numbers into decisions you both understand and write down.

Is it safe to link all our accounts to one app?

It can be reasonably safe if the app uses read-only connections and two-factor login, but it concentrates risk. Keep the logins for the stock plan portal and your main brokerage separate and strong, review which apps have account access once a year, and remove any you no longer use.

Can a projection tool tell us when we can afford to cut back on work?

It can show a range of outcomes. For a family with RSUs, the answer moves with the stock price, vesting schedules and state tax, so the useful output is a range with the key assumptions listed, reviewed at least once a year, rather than a single date.

Next step

Pick one tool you already use and check one thing: does it show the tax still owed on your vested RSUs? If not, note the gap and plan your April payment separately. If you would like someone to review your equity, tax and family documents together, our tax management, equity compensation and family governance work covers that, and a Tax & Wealth Assessment is the usual starting point. For more on choosing help, see what a vetted financial adviser is and what financial planning costs.

This is general education, not individual tax or legal advice. The right setup 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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