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IPO Stock Worth $8 Million? A 5-Question Framework for GRAT vs. IDGT vs. Step-Up Basis in 2026

The $8 Million Question Nobody Warns You About

Your company just IPO'd. You've got 50,000 RSUs that vested at $80/share ($4,000,000), 20,000 ISOs with an $2 strike and a $78/share spread ($1,560,000), and 30,000 NSOs with a $5 strike ($2,250,000 spread). Total value: roughly $7.8 million, rounding to $8 million.

NerdWallet's guide to IPO tax planning calls this correctly: it's an "enormous income year." The RSU vest and NSO exercise both hit as ordinary income the moment liquidity happens — federal 37% top bracket, plus state, plus the ISO spread throwing you into AMT territory. You'll likely sell 35-45% of the position just to cover the tax bill this year.

But the tax question that actually determines your family's wealth 20 years from now isn't this year's withholding — it's what you do with what's left. And that decision genuinely depends on your specific numbers, not a rule of thumb. Here's the framework.

Question 1: Does Your Net Worth Actually Clear the Exemption?

The federal estate tax exemption sits at $13.61 million per person for 2026 (we've broken this down in detail in Estate Tax in 2026: The $13.61 Million Exemption and What It Means for Your Family). Married couples get $27.22 million with a proper portability election.

If your $8M in stock, plus your house, plus your 401(k), plus everything else, lands you at $6M total net worth — you're not an estate tax problem. You're an income tax problem. In that case, aggressive GRAT or IDGT structuring to move appreciation out of your estate is solving a problem you don't have, while giving up something valuable: step-up in basis at death.

If instead this IPO pushes a married couple's combined net worth past $27.22M — now the math flips hard, because the federal estate tax rate on the excess is 40%, dwarfing the ~23.8% combined federal long-term capital gains and net investment income tax rate you'd pay on the same dollar if you just held it and sold.

This is the single biggest fork in the framework, and it's exactly why "GRAT it all" or "just hold it" are both wrong as universal advice.

Question 2: What State Do You Actually Live In?

Federal exemption is only half the picture. If you're in Washington State, the state estate tax exemption is roughly $2.19 million with rates up to 20% — meaning even a mid-size IPO windfall triggers state-level estate tax that has nothing to do with the federal $13.61M threshold. Oregon's exemption sits near $1M. Massachusetts recently raised its exemption to $2M but still taxes the whole estate once you cross it, not just the excess.

Compare that to Florida, which has no state estate tax and no state income tax at all.

If you're already flying down to scout a move — the Hyatt Centric Las Olas in Fort Lauderdale runs around $150/night off-peak and puts you walking distance from the same downtown you'd be establishing domicile in — there's a real tax reason behind the trip beyond the weather. For someone with a $2M+ state estate tax exposure, establishing Florida residency before the trust or gifting strategy is finalized can be worth more than any single trust structure.

You can model this for your specific situation at Voritanel — state jurisdiction alone can shift the right answer by six figures before you've even touched a trust document.

Question 3: What's the Rate Environment Doing Right Now?

This matters more than most people realize, and it's moving. The Bureau of Labor Statistics reported CPI up just 0.5% in May 2026 and unemployment ticking up to 4.2% in June, with payroll growth slowing to +57,000 — a soft print. NerdWallet's mortgage rate coverage confirms the read-through: rates are dipping and a Fed hike looks unlikely after that jobs data.

Cooling inflation and a softening labor market typically pull the IRS 7520 rate down over time (we tracked this dynamic in IRS 7520 Rate in July 2026: How Weak Jobs Data and Mortgage Rate Swings Could Shift GRAT vs. IDGT Math). A lower 7520 rate is unambiguously good for GRATs and CRTs — it lowers the hurdle rate your assets need to beat for excess growth to pass tax-free. For this scenario, we'll use 4.6%, down from 4.8% earlier in the year.

Question 4: GRAT, IDGT, or Just Hold It? The Actual Math

Let's say after taxes you retain $5,000,000 of the concentrated stock position. Here's what each path produces, assuming a post-IPO growth assumption of 12% annually — aggressive, but not unusual for a hot IPO in its first few years.

GRAT (2-year term, zeroed-out, 4.6% 7520 rate): The annuity factor for two years at 4.6% works out to roughly 1.87, so annual payments back to you are about $2,673,800. Year one: $5,000,000 grows to $5,600,000, minus the payment, leaves $2,926,200. Year two: that grows to $3,277,300, minus the payment, leaves about $603,500 passing to your beneficiaries completely free of gift and estate tax — using zero lifetime exemption.

IDGT (5-year note, ~4.3% AFR, requires a seed gift): You gift roughly $500,000 (10% of funding) to seed the trust, then sell the remaining $5,000,000 stock to the trust for a promissory note at 4.3% interest-only. If the stock grows at 12% for five years, it reaches about $8,811,700. The trust repays the $5,000,000 note; the remaining $3,811,700 passes outside your estate — a much bigger number, but it took five years of mortality risk, uses $500,000 of exemption, and requires the trust to actually generate the cash flow to service interest payments annually.

Hold and let it step up (no trust at all): If your total estate is comfortably under the $13.61M/$27.22M threshold, you just... hold the stock. When you pass it to heirs, they get a stepped-up basis to fair market value at death — the built-in gain from IPO to death evaporates for capital gains purposes, tax-free. No trust complexity, no mortality risk, no seed gift.

StrategyAmount Transferred (est.)Exemption UsedStep-Up Basis Preserved?Best When
GRAT (2-yr)~$603,500$0NoEstate clearly over exemption, want zero gift tax use
IDGT (5-yr)~$3,811,700~$500,000 seedNoLong horizon, comfortable with note mechanics, estate well over exemption
Hold to death$0 transferred pre-death, but full step-up$0YesEstate under exemption + portability, or heirs likely to sell soon after inheriting

This is the kind of side-by-side Voritanel runs for you automatically — so you're not hand-computing annuity factors on a legal pad.

Question 5: Do You Actually Need Portability, or Are You Overbuilding?

If you're married and your combined estate is projected at, say, $20M even after this IPO, a properly filed portability election on the first spouse's estate tax return may get you to the full $27.22M exemption without ever touching a GRAT or IDGT. That's a far simpler path — no trust administration, no mortality risk, no seed gift — and it preserves step-up basis on everything. We walked through this exact trade-off in GRAT vs. IDGT vs. Portability on a $6M Asset: Step by Step.

The mistake we see most often: people who just had an "enormous income year" assume the sophisticated move is always the trust. Sometimes the sophisticated move is recognizing you don't need one yet.

Why 1976 Is a Useful Gut-Check Here

NerdWallet's look back at 1976 home prices is a good reminder of what step-up basis is actually protecting against. The median home price in 1976 was around $44,400; today it's north of $412,000 — roughly a 9x increase, a built-in gain that would trigger real capital gains tax if sold without a basis reset. Your IPO stock, if it performs anything like the market has over long stretches, could carry a similarly enormous embedded gain by the time you pass it on. Whether that gain gets stepped up tax-free or gets moved into a trust that preserves the original low basis is not a small detail — it can be worth hundreds of thousands of dollars depending on how long you hold and how much the asset appreciates.

Run Your Actual Numbers

Every variable here — your total net worth, your state of residence, the current 7520 rate, your growth assumption, your marital status — changes which answer is correct. The framework tells you which questions to ask. It can't tell you the answer without your inputs.

If you want the actual GRAT annuity math, IDGT note terms, and step-up basis comparison run against your specific IPO numbers rather than the $5M example above, Voritanel builds that model with your real figures — no spreadsheet required on your end.

Sources

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