Sudden windfall: what to do if you inherit, sell, or hit it big

A sudden windfall — an inheritance, a business sale, an IPO that finally lets the lockup roll off, a lawsuit settlement, a divorce settlement, a lottery ticket — is one of the most financially dangerous moments of a person's life. That sounds counterintuitive. You just got rich. How is that dangerous?

Because most people get the first 90 days wrong, and the first 90 days set the tax bill, the lifestyle, and the runway for the next 30 years. The myths people repeat about windfalls are mostly wrong (no, 70% of lottery winners don't go bankrupt — that "statistic" was never backed by research, and the National Endowment for Financial Education has explicitly disclaimed it). But the underlying behavioral pattern — accelerate the spending, defer the decisions, fire the wrong people, miss the tax windows — is very, very real. And it's expensive.

This is the high-net-worth playbook: what to do in the first 90 days, what tax rules apply to which kind of windfall, how to build the team, and how to avoid the lifestyle decisions that quietly lock in a burn rate you can't sustain.

Why sudden wealth derails most people

The myth: "70% of lottery winners go broke within a few years." That number is folk knowledge. The actual data is more sobering in some places and less catastrophic in others.

• Lottery winners: The Certified Financial Planner Board of Standards has cited research suggesting roughly one-third of lottery winners ultimately file for bankruptcy, and they're more likely to file within three to five years than the average American.
• NFL retirees: A National Bureau of Economic Research study tracked every player drafted 1996–2003. About 15.7% had filed for bankruptcy within 12 years of retirement — and longer, higher-earning careers did not significantly reduce that risk.
• Business sellers and inheritors: The data is thinner, but advisors who work with first-generation liquidity events consistently report that the largest single mistake is locking in a lifestyle burn rate within 12 months of the event.

The mechanism is the same in every case:

1. Identity gets ahead of math. You're suddenly "rich," so you make decisions consistent with being rich — house, car, club, jet card — before you've calculated what your post-tax, post-inflation income actually is.
2. Everyone you've ever met materializes. Family, old friends, charity boards, business pitches. The asks are bigger than the math allows.
3. The wrong advisors get there first. Brokers, insurance salespeople, and "wealth managers" who cold-called you the week the news broke are not the team you want.
4. Tax windows close silently. QSBS elections, 10b5-1 plans, installment sale structures, charitable remainder trusts, disclaimer trusts — most of these have deadlines measured in days or weeks, not years. Miss the window and you can owe seven or eight figures more than you needed to.

The good news: every one of these failure modes is preventable, and the protection is structural, not psychological. It starts with not moving fast.

The 60–90 day decision freeze

The single most valuable thing you can do in the first 90 days after a windfall is nothing.

Park the money. Treasury bills, a high-yield savings account at a brokerage, or a brokered CD ladder — pick one. The yield is fine. The yield is not the point. The point is buying yourself time to think.

What "doing nothing" actually means:

• Don't sign any investment paperwork beyond opening a brokerage account and parking cash.
• Don't buy a house, a car, a boat, or a membership.
• Don't quit your job if you still have one.
• Don't tell more people than necessary. Anonymity, where legally possible, is an asset.
• Don't make charitable pledges. Especially the multi-year, public, named ones.
• Don't lend money to family. Or at least don't lend it in the first 90 days.

What you should do in the first 90 days:

1. Hire a CPA who specializes in your kind of windfall (M&A exits, equity comp, estate administration, settlement income — these are different specialties).
2. Engage an estate attorney. Not the one who did your will five years ago. One who works with eight- and nine-figure estates.
3. Open a separate brokerage account in your individual name (or in a trust, on advice) for the windfall money. Do not commingle it with existing accounts yet — for asset protection, tax tracing, and (if relevant) divorce protection.
4. Make a list of every check you need to write. Estimated taxes are usually the largest. Underestimate those and you'll be writing a much larger check in April.
5. Get an umbrella insurance policy with a face value that matches your new net worth. Premiums are cheap. The exposure is not.

The 90-day freeze is unglamorous and it works. The decisions you make in month four are dramatically better than the decisions you would have made in week one.

Tax buckets: not all windfalls are taxed the same

The tax treatment of a windfall depends almost entirely on its source. Treat these as four different problems.

1) Inheritance

Inheritance is — for the heir — generally not income. The estate may owe estate tax above the federal exemption ($15 million per person in 2026 under the One Big Beautiful Bill Act, indexed for inflation, with no scheduled sunset), but the heir typically does not pay income tax on the receipt of inherited cash, securities, or real estate.

What heirs do need to understand:

• Step-up in basis is still intact. The OBBBA preserved the rule. When you inherit appreciated assets, your tax basis resets to the fair market value on the date of death (or the alternate valuation date, if elected). If your grandfather bought a stock at $4 a share and it's worth $400 at his death, your basis is $400. You can sell the next day with effectively no capital gains tax.
• The step-up applies to assets included in the taxable estate. Lifetime gifts get carryover basis, not a step-up. This is one of the most important asymmetries in U.S. estate planning, and it matters most for highly appreciated assets — closely held business interests, founder stock, raw land, art.
• Inherited retirement accounts are different. Traditional IRAs and 401(k)s do not get a step-up because they were never taxed in the first place. Most non-spouse beneficiaries are now subject to the SECURE Act 10-year rule, which forces full distribution within ten years and, for many beneficiaries, requires annual RMDs during the 10-year window. For the full mechanics — including the five categories of "eligible designated beneficiaries" who can stretch — see our inherited IRA 10-year rule article.
• The estate settlement timeline is months, not weeks. Probate, beneficiary identification, asset valuation, creditor notice periods, fiduciary accountings, and (if relevant) estate tax return filing (Form 706, generally due nine months after death with a six-month extension available) all take time. Plan for the windfall to land in installments.

2) Business sale or M&A exit

This is the most tax-sensitive windfall on the list, and it's the one with the most planning levers — almost all of which need to be pulled before the closing.

The biggest single lever for founders is Qualified Small Business Stock under Section 1202. Under the OBBBA, the rules were significantly expanded for stock acquired after July 4, 2025:

• Tiered exclusion based on holding period: 50% gain exclusion at 3 years, 75% at 4 years, 100% at 5+ years.
• Per-issuer exclusion cap raised from $10 million to $15 million (or 10x the taxpayer's basis, whichever is greater).
• The $15 million cap is indexed for inflation starting in 2027.
• Stock acquired before July 4, 2025 generally continues under the prior rules (five-year hold, $10M cap).

The combination of "stacking" QSBS across multiple family members, trusts, and entities, with the new tiered holding periods, has made Section 1202 the single most important tax provision for venture-backed founders. Get it wrong and you pay 20% (federal long-term capital gains) plus 3.8% net investment income tax plus state. Get it right and a significant portion can be excluded entirely.

Other levers worth knowing:

• Installment sales (IRC §453). Spread the gain over multiple tax years. Note: large installment sales trigger §453A interest on the deferred tax liability above $5 million of outstanding obligations.
• Qualified Opportunity Zones. Defer capital gains by reinvesting in a Qualified Opportunity Fund within 180 days of the gain event. The rules around basis step-ups have evolved; current treatment depends on year of investment.
• §1031 like-kind exchanges (real estate only). Real estate exits can defer gain by exchanging into replacement property under strict 45-day identification and 180-day closing windows.
• Charitable remainder trusts (CRTs). Pre-sale contribution of appreciated business interest to a CRT can defer or eliminate capital gains at the entity level, generate a current-year charitable deduction, and create an income stream.
• Pre-sale gifting and grantor trust planning. Moving founder shares into intentionally defective grantor trusts (IDGTs), spousal lifetime access trusts (SLATs), or generation-skipping trusts before a sale locks in valuation discounts and freezes growth out of the estate. This needs to happen before a letter of intent.

Every one of these strategies has a deadline. By the time you're at signing, most of them are gone. The right time to engage tax counsel is the moment a sale is plausible — not the moment a buyer is at the table.

3) IPO or other equity comp liquidity event

If your windfall is concentrated in your employer's stock — post-IPO, post-acquisition, vesting RSUs, or exercised ISOs — your problem is part tax and part diversification.

Key issues:

• AMT on ISO exercises. Exercising incentive stock options without selling triggers alternative minimum tax on the spread between exercise price and fair market value. If you exercised and held in a high stock price year and the stock then fell, you can owe AMT on phantom gains.
• Lockup periods. Most post-IPO lockups run 90–180 days. Plan for the price after the lockup — many high-profile IPOs see meaningful selling pressure when insiders are first free to sell.
• Rule 10b5-1 plans. Pre-arranged selling plans that allow insiders to sell stock on a predetermined schedule, providing affirmative defense against insider-trading claims. The SEC has tightened the rules — a 90- or 120-day cooling-off period now applies before sales can begin. For a concentrated executive, a 10b5-1 plan is the most professional way to diversify out of single-stock risk.
• Concentrated position risk. Holding more than 10–20% of your net worth in a single stock — especially your employer's stock — is one of the most common, and most preventable, ways high earners blow up their wealth. The mitigation tools include 10b5-1 plans, exchange funds (pooled vehicles that let multiple concentrated holders diversify into a basket without triggering immediate gain — minimum seven-year hold), covered-call overlays, and charitable remainder trusts.

For more on RSU-specific tax mechanics and the trap of letting RSUs vest without a selling plan, see our companion article (forthcoming) on RSUs.

4) Lottery, lawsuit settlement, or other ordinary-income windfall

These windfalls are taxed as ordinary income — the worst possible tax bucket — and they don't get a step-up if you die with them.

• Lottery winnings are taxed as ordinary income at federal rates up to 37%, plus state. Lump sum versus annuity is the first decision. Lump sums give you control and flexibility (you can invest and potentially earn more than the annuity's implicit yield), but lock in the highest possible tax year. Annuities spread tax over decades and force discipline, but expose you to the issuing entity's credit risk and inflation.
• Lawsuit settlements are taxed differently depending on what's being compensated. Compensation for physical injury is generally not taxable; punitive damages, emotional distress, and lost wages generally are. Get a tax opinion on the settlement allocation before you sign.
• Divorce settlements. Property transfers between spouses incident to divorce are generally tax-free, but you take carryover basis on the assets, not a step-up. A $5 million account of highly appreciated stock is not equivalent to $5 million of cash. See our financial planning during divorce article for the full playbook.
• Bonuses and deferred comp. Large one-time bonuses are taxed as ordinary income (with a federal supplemental withholding rate of 22% on bonuses up to $1M and 37% on amounts above). Withholding rarely matches actual liability — quarterly estimated payments may be required to avoid penalty.

Asset protection: build the moat before someone tries to cross it

A windfall makes you a target. Plaintiff lawyers, ex-spouses, contingency-fee litigators, family members with claims — you are now interesting. Asset protection is not paranoia; it's plumbing.

The layered approach, from cheapest to most complex:

• Umbrella insurance. $5–25 million policies are cheap (often a few thousand dollars a year per million of coverage) and cover personal liability, defamation, certain employment claims, and excess auto liability. Get this in week one.
• LLCs around risky assets. Rental real estate, recreational vehicles, boats, side businesses. Each gets its own entity so a liability in one doesn't reach the others or your personal balance sheet.
• Homestead exemption. Some states (Florida, Texas, Iowa) offer unlimited homestead protection. The optimization there is highly state-specific.
• Domestic asset protection trusts (DAPTs). Available in roughly 19 states. Self-settled spendthrift trusts that protect assets from future creditors while preserving discretionary access to the grantor.
• Irrevocable life insurance trusts (ILITs). Hold life insurance policies outside the estate, so death benefits aren't subject to estate tax.
• Spousal lifetime access trusts (SLATs). A common HNW structure that moves assets out of one spouse's estate while preserving indirect access through the other spouse.
• Offshore trusts. The most aggressive option. Cook Islands and Nevis trusts have the strongest case law. Significant compliance burden (FBAR, Form 3520) and a real cost-benefit calculation. Not for everyone.

This planning is most effective when done before a creditor exists. Transfers made after a claim is foreseeable can be unwound as fraudulent conveyances. Build the moat in peace.

The lifestyle creep trap: the decisions that lock in your burn rate

The most expensive windfall decisions aren't the investments. They're the four to six figure recurring decisions that lock in a lifestyle.

The big ones:

• The house. A $5 million home isn't a $5 million decision. It's a $5 million decision plus property tax (1–2% annually), insurance, maintenance (often quoted at 1–2% of home value per year), staff, utilities, and the marginal tax of being unable to move easily. A $5 million primary residence often carries $200–300K of recurring annual cost.
• The car. Or cars. The depreciation alone on a fleet of luxury vehicles can run $100K+ a year.
• The plane or jet card. Fractional jet ownership and jet cards can run $300K–$1M a year for moderate usage. NetJets, Wheels Up, and similar services are sold as conveniences. They are recurring expense commitments.
• The club. Initiation fees of $250K–$1M and dues of $20–60K a year are standard at top private clubs. Multiplied across two or three locations.
• The staff. A house manager, nanny, chef, driver, security — each is a six-figure recurring expense including payroll taxes, benefits, training, and turnover.

The trap is that each decision feels like a one-time purchase. They are not. They are recurring obligations that, in aggregate, can quietly turn a $20 million windfall into a $300–500K-a-year burn rate. That's not bad math. But it's a much lower-margin life than the headline number suggests, and it's exactly how nine-figure inheritances disappear in a generation.

The protection: the lifestyle test.

The lifestyle test: back into your real income

Before you make any lifestyle decision, calculate the sustainable income from your windfall using the 3–4% withdrawal rate rule.

• A $5 million windfall, at a 4% safe withdrawal rate, generates $200,000 a year of pre-tax income. After federal, state, and local tax, that's often $120–140K of after-tax spending.
• A $20 million windfall at 4% generates $800,000 a year pre-tax. Net of tax, often $500–550K.
• A $50 million windfall at 4% generates $2 million a year pre-tax. Net, often $1.2–1.3 million.

That is your real, sustainable, indefinite income. Not the headline number. Not the after-tax lump sum. The annuitized, inflation-adjusted, sustainable income.

Compare that number to your proposed lifestyle. If your annual burn (housing + cars + travel + staff + insurance + family support + taxes) exceeds the 3–4% sustainable rate, you are spending principal. That can be a deliberate decision. It usually isn't.

The 3–4% rule is conservative — it's based on the same logic as retirement planning. For larger estates with multi-generational time horizons, real planning uses Monte Carlo simulations, capital market assumptions, and asset-class glidepaths. But for back-of-envelope sanity-checking on a windfall, the 3–4% rule is the right test.

The team: who you need, in what order

A serious windfall requires a serious team. The order matters.

1. Estate attorney. Hire first. Many of the highest-value planning moves (gift trusts, GST planning, QSBS stacking, pre-sale gifting) require legal documents drafted in time-sensitive windows.
2. CPA / tax advisor. Coordinated with the attorney. For complex windfalls (M&A, equity comp, international assets), this is often a specialty firm, not a generalist.
3. Wealth manager. Once cash is parked and tax planning is in motion, the wealth manager builds the investment plan. The right firm for an $8-figure account is rarely the right firm for a $7-figure account, and vice versa. Be honest about the size and complexity of your situation. See our wealth coach and wealth management overviews.
4. Insurance broker / risk advisor. Umbrella, life, disability, and (for ultra-high-net-worth) D&O and kidnap-and-ransom coverage. Independent brokers, not captive agents.
5. Family office (above ~$30–50M). Single-family offices (SFO) start to make sense in the $100M+ range. Multi-family offices (MFO) start at $25–50M. Below that, a coordinated team of independent advisors is usually more cost-effective.

The team needs to communicate with each other. The most common failure mode of a fragmented advisor team is each advisor optimizing locally — the CPA minimizes current-year tax, the wealth manager maximizes returns, the estate attorney maximizes transfer to heirs — and the strategies actively conflict. Pick one quarterback (usually the attorney for complex estates, the wealth manager for simpler ones) and require quarterly all-hands calls.

If you're not sure how to evaluate the people on your team, our guides on how to choose a financial advisor, whether financial advisors are worth it, and what financial advisors cost are the right place to start. The difference between the financial advisor and financial planner roles matters more after a windfall than before.

Charitable strategies: don't pledge before you plan

Almost every meaningful windfall produces an impulse to give. The impulse is good. The execution often isn't.

• Donor-advised funds (DAFs). A DAF lets you take the full charitable deduction in the windfall year — when your marginal rate is highest — and distribute grants over years or decades. The most flexible tool in HNW charitable planning. Fidelity Charitable, Schwab Charitable, Vanguard Charitable, and community foundations all offer them.
• Charitable remainder trusts (CRTs). Contribute appreciated assets, get a charitable deduction, receive an income stream for life or a term of years, and the remainder goes to charity. Particularly powerful for highly appreciated pre-sale business interests.
• Charitable lead trusts (CLTs). The mirror image — charity gets the income stream, and the remainder goes to heirs at potentially reduced gift/estate tax cost.
• Private foundations. Higher cost, more administrative burden, but provides perpetual family governance and a vehicle for next-generation engagement. Typically makes sense at $5M+ commitments.
• Bunching. Stack multiple years of giving into one windfall year (often into a DAF) to itemize in that year and take the standard deduction in others.
• Appreciated stock, not cash. When you donate appreciated stock held more than a year, you deduct the full fair market value and avoid capital gains tax. Donating $100K of stock with $20K basis is meaningfully better than donating $100K of cash.

The discipline: don't make pledges in year one. Park money in a DAF if you need to capture the deduction. Choose the charities deliberately, after you've thought about both the cause and the governance.

FAQ

How long should I wait before making any big decisions after a windfall?

Ninety days is the standard discipline. The goal is to get past the emotional peak, hire the right team, model the after-tax outcome, and let the obvious-in-retrospect mistakes (the impulse house, the public pledge, the friend's startup) pass. Park the money in Treasuries or a high-yield savings account during that window — yield is fine, time is the point.

Is the step-up in basis still in effect after OBBBA?

Yes. The One Big Beautiful Bill Act preserved the step-up in basis at death. Heirs continue to inherit appreciated assets at fair market value on the date of death, eliminating built-in capital gains for the prior owner's lifetime appreciation. Lifetime gifts, by contrast, still take carryover basis.

How much can I inherit without paying federal estate tax?

The federal estate tax exemption is $15 million per person in 2026 under the OBBBA, indexed for inflation thereafter and with no scheduled sunset. A married couple can shield $30 million with proper portability planning. State estate or inheritance taxes apply in roughly a dozen states with much lower thresholds, so jurisdiction matters.

What's the QSBS exclusion limit after OBBBA?

For Qualified Small Business Stock acquired after July 4, 2025, the OBBBA raised the per-issuer cap to the greater of $15 million or 10x basis, indexed for inflation starting in 2027. The OBBBA also introduced a tiered holding period: 50% exclusion at 3 years, 75% at 4 years, 100% at 5+ years. Stock acquired before July 4, 2025 generally remains under the prior $10M / 5-year rules.

Should I take a lottery lump sum or annuity?

The lump sum is usually mathematically superior for sophisticated investors who can earn a higher long-term return than the annuity's implicit rate, and who want planning flexibility (gifting, charitable, business). The annuity has two advantages: it spreads the tax hit across decades and it enforces discipline. The right answer depends on your investment skill, your tax situation, and your behavioral honesty about whether you'd actually deploy a lump sum well.

What's a "concentrated position" and how do I diversify out?

A concentrated position is typically 10%+ of your net worth in a single security, most often your employer's stock after an IPO, vesting RSUs, or an inheritance of family-business shares. The diversification tools include: a Rule 10b5-1 plan for scheduled selling, exchange funds (pooled vehicles allowing tax-free diversification with a 7-year minimum hold), covered-call overlays for income while you sell, and charitable remainder trusts for gain deferral plus an income stream. Doing nothing is also a choice — usually the wrong one.

Do I need a family office?

Probably not, until you do. Single-family offices generally make sense above $100M in investable assets, where the fixed costs of staff and infrastructure are justified by the customization and control. Multi-family offices start to make sense at $25–50M. Below that, a coordinated team of independent advisors (estate attorney, CPA, wealth manager, insurance broker) is usually more cost-effective than building or buying a family office.

My two cents

The single most valuable thing about a sudden windfall is that it's a one-time event. You get to make the structural decisions exactly once. Do them deliberately, with the right team, and the money will do the work for the rest of your life. Do them in the first six weeks, with the wrong people, and you'll be telling a different kind of story.

The good news is the playbook is well-known. Park the money. Hire the attorney. Hire the CPA. Calculate your 3–4% sustainable income before you sign on any house, car, or club. Build the asset-protection layer. Pre-plan the tax-sensitive moves (QSBS, 10b5-1, CRT, gifting) before the closing. Make charitable commitments in year two, not year one.

If you're staring down a liquidity event — an inheritance, an exit, an IPO, a settlement — and you don't have the team in place yet, the right first call is to book a consultation with our wealth-planning team. The first 90 days are worth more than the next 30 years. Use them well.