Regular 401(k) contributions, growing home equity, and vested stock options can slowly add up to a $1 million net worth over the course of a career, without any big windfall.
For many people, the milestone happens quietly. There’s no big celebration or dramatic change, just years of steady saving and investing finally adding up.
Joanna Rotenberg, managing director of Vanguard’s Advice & Wealth Management, flagged what she calls a growing blind spot among “hidden millionaires,” Americans whose accumulated wealth has outgrown the way they see themselves.
A Vanguard survey found that nearly 30% of millionaires feel their finances control their lives.
Northwestern Mutual’s 2025 Planning and Progress Study found that just 36% of Americans with $1 million or more in investable assets consider themselves wealthy.
Nearly eight in 10 described their net worth as self-made, consistent with wealth built through discipline. That mismatch between net worth and financial self-image leads to outdated debt decisions, missed tax advantages, and neglected estate plans, Rotenberg warned.
How high-interest debt erodes hidden millionaire wealth
The first trap Rotenberg identifies hits disciplined savers who hold large cash reserves while simultaneously having credit card balances at double-digit interest rates.
Credit card rates for accounts having a balance averaged 22.15% in the second quarter of 2026, the Federal Reserve’s G.19 report confirmed.
A household earning 4% on $50,000 in savings earns $2,000 a year in interest, while paying 22% on $15,000 in revolving credit card debt costs $3,300 a year in interest, a net loss of $1,300 annually, according to Vanguard’s illustration.
Both decisions feel individually responsible, but the interest rate gap means the debt destroys more wealth than the savings account can generate.
Rotenberg warned in Vanguard’s analysis that the pattern persists because cash reserves feel psychologically protective, even when the numbers work against the holder.
<strong>Many people feel better holding a large cash cushion, especially after periods of volatility, but if your credit card interest rate is higher than what you are earning on your cash, the math flips. You can lose far more than you gain</strong>.
Rotenberg’s advice starts with a simple step: Pay off high-interest debt before putting more money into long-term retirement accounts. It’s a step many people with growing wealth overlook because the debt can seem manageable compared with everything else they own.
Hidden millionaires who carry revolving debt are effectively paying lenders a return their portfolios never see, Rotenberg’s analysis noted.
A household that still sees itself as middle-income is less likely to treat a $15,000 credit card balance as a structural problem worth solving immediately.
More than half of Americans lack basic estate planning documents
The Trust & Will 2026 Estate Planning Report, based on a survey of 5,000 U.S. adults conducted in late January and early February 2026, found that 56% of Americans don’t have a will, trust, medical directive, or power of attorney in place.
Will ownership dropped five percentage points in a single year, from 31% in 2025 to 26% in 2026, even as 73% of respondents said estate planning is personally important to them.
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Rotenberg singled out the estate planning blind spot as particularly high-stakes, because it puts the wealth built at risk of being distributed on the state’s terms.
Rotenberg noted in her essay that nearly a quarter of millionaires have no estate planning documents.
Northwestern Mutual’s Study found that only 53% of millionaires expect to leave an inheritance or charitable gift. That suggests many seven-figure households have not yet formalized how their wealth will transfer.
Tax-efficient tools 7-figure households routinely overlook
Tax strategy presents a similar risk because vested stock, rising dividends, and growing capital gains introduce complexity that Rotenberg said a standard filing approach is not designed to capture.
Rotenberg’s analysis recommends reviewing vesting schedules, bonus timing, and anticipated gains well outside the April 2027 filing window, so that surprises do not arrive at tax time.
Health Savings Accounts (HSAs) and Roth individual retirement account conversions are among the tax-efficient tools Rotenberg identified as consistently overlooked by seven-figure households.
For 2026, the Internal Revenue Service allows individual HSA contributions of $4,400 and family contributions of $8,750 for the calendar year, according to Revenue Procedure 2025-19.
Roth conversions have a similar identity-gap problem for hidden millionaires with traditional tax-deferred accounts.
They may not realize that converting a portion during lower-income years can reduce future required minimum distributions and the tax liability attached to them.
Each missed year of HSA contributions or unconverted IRA balances forfeits tax-advantaged growth that Rotenberg’s analysis says cannot be recaptured later. The window for Roth conversions narrows once required minimum distributions begin.
That makes a proactive review well before retirement essential, since the April filing deadline alone is not designed to prompt it.
What Rotenberg’s warning means for your next financial review
The thread connecting all three blind spots is a financial identity that hasn’t kept up with a reality that gradually changed over years of steady accumulation.
Rotenberg recommended a proactive tax review well before April 2027 and completing or updating estate documents every three years, or after any major life change.
Northwestern Mutual’s data reinforces that the gap between what hidden millionaires have and how they manage it narrows most effectively with professional guidance.
The gap between accumulated wealth and outdated financial habits narrows fastest when the next review starts from the balance sheet as it stands today.
Related: Vanguard says 30% of millionaires feel broke, but it can be fixed
