Pre-IPO Tax Planning for Bay Area Employees

A senior engineer walked into our San Jose office last March holding two tax bills. The first was a $79,400 AMT assessment from the prior year. The second was the option exercise notice that caused it: 50,000 ISOs exercised at a $4 strike when the 409A had crept up to $22, generating $900,000 of AMT preference income on a stock he could not sell, in a company that had just postponed its IPO. He had the shares. He owed the tax. He had no liquidity to pay. That is the pre-IPO trap, and it is the single most common reason Bay Area tech employees come to our equity compensation practice.

Pre-IPO equity is the most tax-sensitive asset most people will ever own. The decisions you make about when to exercise, how many shares to exercise per year, whether to participate in tender offers, and how to start the QSBS clock will dictate whether your eventual exit is taxed at 0%, 23.8%, or north of 50% combined federal and California. The right plan is rarely intuitive, and the wrong plan is rarely reversible.

This page lays out how Silicon Valley Tax thinks about pre-IPO planning for employees and early hires at startups, unicorns, and late-stage private companies across the Bay Area. We cover ISO exercise timing, AMT mechanics, QSBS qualification, tender offers, and the IPO event itself. If your company is anywhere on the path from Series A to S-1, this is the framework we use.

Why ISO Timing Is the Whole Game

Incentive stock options are uniquely powerful and uniquely dangerous. The power: if you exercise and hold the shares for the required periods (at least 2 years from grant and 1 year from exercise), the entire spread at sale is long-term capital gain. The danger: at exercise, the spread between strike and fair market value is an alternative minimum tax preference item under IRC Section 56(b)(3), even though you have not received a dime of cash.

For 2026, the AMT exemption phases out completely at $1,310,200 of AMTI for single filers and $1,827,000 for married filing jointly, after which AMT effectively applies dollar-for-dollar on the preference. The AMT rate is 26% up to $239,100 of AMTI above exemption, then 28% above that. California adds 7% state AMT on top, and California does not conform to the federal AMT credit carryforward in the same way, so the California bill is paid every year regardless.

The practical effect: exercising too many ISOs in a single year, in a year when the 409A has run up, can generate a six-figure AMT bill on shares that have no liquid market. We have seen this go wrong dozens of times. The fix is almost always a multi-year staggered exercise plan calibrated to the AMT crossover point, sized to keep each year's AMT inside what you can pay from W-2 cash without forced selling. Our 2026 AMT guide walks through the crossover math in detail.

The AMT Crossover and How We Model It

The AMT crossover is the number of shares you can exercise in a given year before the AMT preference exceeds your regular tax liability. Below the crossover, exercising ISOs costs you nothing extra in current-year federal tax. Above it, every additional share triggers AMT at 26% or 28% federal plus 7% California.

We model the crossover annually for clients, because the inputs change every year:

• Your regular tax liability for the year (driven by W-2, bonus, RSU vest, and other income)
• Current 409A valuation versus your strike price
• State of residence (California adds 7%, Nevada and Texas add nothing)
• Filing status and dependents
• Any other AMT preference items (large state-tax deduction add-back, tax-exempt bond interest, etc.)

For a typical Bay Area engineer making $280,000 W-2 plus $150,000 of RSU vests at a married filing jointly rate, the AMT crossover often lands somewhere between 8,000 and 25,000 ISOs per year, depending on the spread. The right plan exercises up to that line every year for as many years as the option grant allows, rather than a single large exercise at IPO when the crossover is meaningless and the AMT is unavoidable.

Worked Example: 100,000 ISOs, $2 Strike, $20 FMV

You joined a Series C startup three years ago. You have 100,000 vested ISOs at a $2 strike. The most recent 409A is $20. Your W-2 is $250,000 and your spouse earns $180,000; you file MFJ. The company is filing for IPO sometime in the next 18 to 24 months, but the path is uncertain.

Plan A, single-year exercise at IPO: You wait, the company files, the lockup expires, and you exercise all 100,000 ISOs in the IPO year. Strike $2 × 100,000 = $200,000 cash out the door. FMV at exercise (say it has crept to $35 by then) × 100,000 = $3,500,000. AMT preference = $3,300,000. Federal AMT at full 28% rate on essentially the entire amount = roughly $920,000. California AMT at 7% = roughly $230,000. Total cash tax due in that one year: about $1.15M, on shares you cannot sell for another six months because of the lockup. You generate an AMT credit you may recoup over future years, but the cash crunch is real and immediate.

Plan B, staggered four-year exercise plan: Starting today, you exercise 25,000 ISOs per year for four consecutive years. Year 1 spread = ($20 - $2) × 25,000 = $450,000 of AMT preference. Layered on your $430,000 regular income, this generates roughly $90,000 to $115,000 of additional federal+CA AMT, payable from W-2 cash and a small loan against your house if needed. You repeat the exercise in each of the next three years, adjusting volume to that year's crossover and 409A. Total AMT across four years: roughly $400,000 to $500,000 instead of $1.15M. Crucially: your QSBS holding period (if the company qualifies) and your long-term capital gains clock both started four years earlier, meaning the IPO sale is fully long-term and potentially QSBS-eligible.

The difference: Plan B can save $600,000+ in lifetime federal+state tax versus Plan A, and removes the cash-crunch risk entirely. The trade-off is exercising stock that is still illiquid and could go to zero, which is why the modeling has to be done against your actual risk tolerance, not a template.

QSBS: How to Make the Exit Tax-Free

Qualified Small Business Stock under IRC Section 1202 is the single largest tax break available to pre-IPO employees, and most people exercise their options without checking whether they qualify. If the stock qualifies and you hold it for 5+ years before sale, federal tax on up to $15 million of gain per company (after the 2025 OBBBA increase from $10M) is excluded outright. The federal saving on a $10M QSBS exit is roughly $2.38 million at the 23.8% LTCG+NIIT rate. California does not conform to Section 1202, so the state bill still applies, but the federal savings are enormous.

For an employee to receive QSBS treatment, the stock must be:

1. Issued by a domestic C-corporation when the company's aggregate gross assets did not exceed $50 million immediately before and after issuance
2. Acquired at original issuance from the company (not on the secondary market) in exchange for money, property, or services
3. Held for more than 5 years before sale
4. Held while the company was an active business (80% of assets used in a qualified trade or business, with several disqualified industries including law, health, financial services, hospitality, farming, and natural resources)

For ISO holders, the QSBS 5-year clock starts at exercise, not at grant. This is the single most important reason to consider exercising ISOs early in a pre-IPO company that qualifies. Waiting until IPO to exercise restarts the QSBS clock at the IPO date, which usually means selling more than 5 years post-IPO before the federal exclusion applies. By then the price discovery is done and the asymmetric upside has often been captured. Our QSBS / Section 1202 deep-dive covers the qualification mechanics, the $15M / 10x-basis ceiling, and the stacking strategies (gifts to non-grantor trusts) used to multiply the exclusion across family members.

Tender Offers: When to Sell and When to Hold

Many late-stage private companies run periodic tender offers, allowing employees to sell a portion of their vested shares to a designated buyer (typically a strategic investor or the company itself). The tax treatment depends on whether you previously exercised the shares and how long ago.

Scenario	Federal Tax Treatment	Notes
Tender unexercised ISOs (cashless)	Ordinary income on entire spread	Disqualifying disposition; no ISO benefit. Up to 50%+ combined rate.
Tender ISO shares held <1 year from exercise	Disqualifying disposition: ordinary on spread, ST capital on rest	AMT preference reversed in same year (good); but you lose LTCG.
Tender ISO shares held >2yr grant + >1yr exercise	Long-term capital gain on entire spread	Qualifying disposition; max 23.8% federal + 13.3% CA.
Tender NSO shares (post-exercise)	Capital gain on appreciation above exercise FMV	Spread already taxed as W-2 ordinary at exercise; basis = FMV-at-exercise.
Tender QSBS-qualified shares held >5yr	Up to $15M excluded federally per Sec. 1202	CA still taxes (no conformity). Verify tender qualifies as a "sale."

Two pitfalls we see constantly with tenders: people sell ISO shares 11 months after exercise (one month short of LTCG) and lose tens of thousands by missing the holding-period cliff, and people participate in a tender on QSBS-qualifying stock at year 4 instead of waiting one more year for the federal exclusion. Both are pure timing mistakes that cost real money.

What Happens at the IPO Itself

The IPO event creates several distinct tax problems that all hit in the same 12-month window:

• Lockup expiry: Usually 90 to 180 days after IPO. You cannot sell during lockup, but you may owe tax on RSU vests or option exercises that happen during the window.
• Double-trigger RSU vesting: Many pre-IPO companies grant RSUs that vest only on the later of time-based vest AND a liquidity event (the IPO). All double-trigger RSUs vest at IPO, generating massive W-2 income in a single year and pushing your marginal rate to 37% federal plus 13.3% California.
• NSO exercises: If you have NSOs, exercising at IPO generates W-2 ordinary income on the spread. Pre-IPO NSO exercise is sometimes better, but the company often does not permit it. See our ISO vs NSO guide.
• Estimated tax / safe harbor: Withholding on RSU vests is set at the supplemental rate (22% federal, 10.23% California) which is dramatically below the marginal rate. The withholding gap is huge. We file Q4 estimates to avoid underpayment penalties.
• 10b5-1 trading plan: Senior employees with material non-public information need a 10b5-1 plan to legally sell during open windows. We coordinate the tax timing of the plan with the issuer's counsel.

The IPO year is almost always your highest-tax-rate year ever. Every dollar of pre-IPO planning we can do beforehand (locking in LTCG status, starting QSBS clocks, capping AMT exposure) reduces what gets dumped into the IPO year. The flip side: clients who arrived too late to do that work, post-IPO, get our post-IPO planning treatment for diversification, 10b5-1, and concentrated stock management.

How We Run a Pre-IPO Engagement

A typical pre-IPO planning engagement at Silicon Valley Tax includes:

1. Equity inventory and FMV snapshot: Full schedule of ISOs, NSOs, RSUs, and RSAs you hold across all grants, plus current 409A and any expected refresh grants.
2. QSBS qualification review: We verify the company satisfies Section 1202 (gross assets, qualified business, original issuance) at the dates relevant to your grants.
3. Multi-year AMT crossover model: Year-by-year exercise volume tied to your projected W-2, RSU vests, and household income.
4. Tender offer evaluation: When the company runs a tender, we run the qualifying vs disqualifying disposition math against your specific holding periods.
5. 83(b) coordination on early exercises: If you have an early-exercise provision and exercise unvested shares, we draft and file the §83(b) election inside the 30-day window.
6. Federal + California cash flow planning: Quarterly estimates, AMT credit tracking, and California-specific add-backs.
7. Coordination with your wealth manager and the company's stock plan team: Trading windows, Rule 144 timing, and 10b5-1 plan execution.

FAQ: Pre-IPO Tax Planning

When should I exercise my ISOs?

The earlier you exercise (assuming the company is QSBS-qualified and you are confident in the underlying business), the better the after-tax outcome usually is. Early exercise locks in a small spread (low AMT), starts both the LTCG and QSBS clocks, and uses your annual AMT crossover budget efficiently. The right answer for your specific grant depends on your cash position, the current 409A versus your strike, and your confidence in the company. We model it numerically rather than by gut.

How does AMT actually work when I exercise ISOs?

At exercise, the spread between your strike and the current FMV (per the 409A) is added to your AMT income, even though no cash changed hands. You then compute regular tax and tentative minimum tax separately, and pay the higher of the two. The AMT you paid generates a credit (Form 8801) that you can recover in future years when regular tax exceeds tentative minimum tax, but recovery is slow, often spread across many years, and California does not give back the state AMT in the same way.

What is a tender offer and how is it taxed?

A tender offer is a structured liquidity event in which a buyer offers to purchase shares from current and former employees at a set price. Tax treatment depends entirely on what you tender (unexercised options vs exercised shares), how long ago you exercised, and whether your shares meet the ISO holding periods or QSBS criteria. See the table above for the most common scenarios.

When does the QSBS 5-year holding period start?

For ISOs, the QSBS clock starts on the date you exercise, not the grant date. For founders with restricted stock and a timely §83(b) election, the clock starts at issuance. For NSOs, the clock also starts at exercise (and the spread is taxed as ordinary W-2 income at that time, so the basis is FMV-at-exercise). Waiting until the IPO to exercise pushes the QSBS clock 5 years past IPO, which usually means selling fully taxable at exit.

What happens to my equity at the IPO?

It depends on the instrument. Vested ISOs and NSOs that you have already exercised become tradable shares subject to the lockup period (90 to 180 days). Unexercised options remain options. Double-trigger RSUs vest in full at IPO, generating large W-2 income that year. ESPP shares purchased during the offering periods follow ordinary ESPP qualifying/disqualifying disposition rules. The combined hit usually pushes you into the top federal and California brackets that year. Cash planning for the resulting tax bill needs to start months before the IPO, not after.

Can I exercise ISOs after I leave the company?

Standard ISO plans give you 90 days post-termination to exercise vested options before they convert to NSOs or expire. Some companies extend this window. If you exercise within the 90-day window, the shares remain ISOs for tax purposes; after 90 days, they convert to NSOs and the tax treatment changes (spread at exercise becomes ordinary income). If you are about to leave a pre-IPO company with unexercised vested ISOs, we need to talk before your last day.

Talk to Us Before You Exercise

The cost of getting pre-IPO equity planning wrong is measured in years of after-tax salary. The cost of getting it right is a one-hour consultation and the discipline to follow a multi-year plan. We work with pre-IPO employees and early hires at companies across the Bay Area, from seed-stage startups in Palo Alto to late-stage unicorns approaching their S-1, and the conversations we wish we had earlier are almost always the same one: model the AMT before you exercise, verify QSBS before you assume it, and never let a tender offer surprise you. Book a free consultation or call us at (408) 383-9870 and we will run your specific equity stack through the math before the next exercise window opens.