How Stock Options Are Divided in California vs New York
Couples with stock options, RSUs, or founder equity face dramatically different financial outcomes depending on whether they live in California or New York. A single RSU grant worth $500,000 could yield a 50/50 community property split in California or a 60/40 (or even 70/30) equitable distribution in New York, and the coverture formula a court applies can shift tens of thousands of dollars from one partner to the other. Understanding these differences before you marry, or before equity compensation becomes a major part of your household wealth, is one of the smartest financial planning moves a couple can make together.
Key takeaways
- California uses a 50/50 community property default for stock options granted during marriage, while New York divides the marital portion equitably (fairly, but not necessarily equally), weighing 13 statutory factors.
- Courts classify unvested options and RSUs as marital property if the grant date falls during the marriage, even if vesting occurs years after separation.
- California's Hug formula measures the community share from the date of hire to separation; the Nelson formula measures from the grant date to separation, producing materially different fractions for the same grant.
- New York's four-step DeJesus analysis (DeJesus v. DeJesus, 90 N.Y.2d 643, 1997) separates the past-service portion from the future-incentive portion before applying a time-rule fraction and equitable distribution.
- A prenup can pre-define how unvested and future equity compensation is treated, potentially saving $15,000-$50,000+ in forensic valuation and litigation costs.
- Tax treatment varies by equity type: ISOs may qualify for long-term capital gains rates (2025 federal rate of 15%-20%), while NQSOs and RSUs are taxed as ordinary income upon exercise or vesting.
How are stock options divided differently in California vs New York?
California is a community property state that splits stock options acquired during marriage on a 50/50 basis, while New York is an equitable-distribution state that divides the marital portion fairly but not necessarily equally. This single structural difference can move hundreds of thousands of dollars between partners when significant equity compensation is involved.
In California, Family Code §760 establishes the baseline: property acquired during marriage is community property. Stock options and RSUs fall squarely within that definition. When those grants vest, each spouse is entitled to half of the community share. Family Code §770 and §771 then carve out anything earned before marriage or after the date of separation as separate property.
New York takes a different path. The NYC Bar's guide to marital property rights explains that New York courts must divide marital property "equitably," considering 13 statutory factors including each spouse's income, the length of the marriage, and each partner's contributions to the household. There is no statutory requirement for a 50/50 split. A judge hearing a case involving $400,000 in unvested RSUs might award one spouse 55% or 65% of the marital portion based on circumstances the California system wouldn't weigh at all.
For couples planning together, this means the state where you file isn't just a procedural detail. It's a financial variable that can reshape how your combined wealth is allocated. If you and your partner hold equity in a tech startup or public company, aligning on expectations early through a prenup and equity conversation removes the guesswork from which formula and which state's rules will apply.
Are stock options and RSUs considered marital property?
Stock options and RSUs granted during marriage are generally treated as marital or community property in both California and New York, even if they haven't vested by the time the couple separates. The classification turns on three variables: the grant date, the vesting schedule, and whether the award is compensating past work or incentivizing future performance.
California's rule is straightforward on the surface. If your employer issued you 10,000 RSUs while you were married and domiciled in California, those RSUs carry a community property presumption. The complexity appears when a grant straddles the marriage timeline. Options granted before the wedding but vesting entirely during the marriage may still contain a community component because the vesting period overlaps with the partnership. Similarly, options granted during the marriage but vesting after separation will be split into community and separate portions using a coverture fraction.
New York follows a similar logic but uses different vocabulary. Property acquired during the marriage is presumed marital property, and courts regularly classify unvested stock options as part of the marital estate. The DeJesus v. DeJesus decision (1997) confirmed that stock plans contingent on continued employment are marital property to the extent they compensate efforts made during the marriage, even when vesting occurs years after a divorce action begins.
A few distinctions matter across equity types:
- Incentive Stock Options (ISOs): Qualify for favorable tax treatment under the Internal Revenue Code. Still classified as marital/community property if granted during marriage.
- Non-Qualified Stock Options (NQSOs): Taxed as ordinary income upon exercise. Same marital property classification rules apply.
- RSUs: Granted outright upon vesting (no purchase price required). Courts in both states treat them like deferred compensation and apply coverture formulas to determine the marital share.
The takeaway for couples: if either partner receives equity compensation during the marriage, it's almost certainly part of the shared financial picture. Planning for this together, ideally before the grants arrive, creates clarity for both partners.
How the Hug, Nelson, and DeJesus coverture formulas work
Courts use time-rule coverture fractions to calculate how much of a partially marital equity grant belongs to the marital estate and how much is separate property. California relies on two formulas (Hug and Nelson), while New York uses the four-step DeJesus analysis. Choosing the wrong formula, or failing to argue for the right one, can shift the marital share by 20 percentage points or more on the same grant.
California: The Hug Formula (Past Service)
The Hug formula comes from In re Marriage of Hug, 154 Cal. App. 3d 780 (1984). It applies when the stock option was granted primarily to compensate the employee for past and present services, or when the vesting schedule functions as a retention mechanism rather than a forward-looking incentive.
Hug formula:
Community fraction = (months from date of hire to date of separation) ÷ (months from date of hire to vesting date)
Because the numerator starts at the hire date, the Hug formula typically produces a larger community share than Nelson. For an employee hired in January 2020 who received a grant in January 2023 with a four-year vesting schedule (vesting January 2027) and separated in July 2025:
- Numerator: January 2020 to July 2025 = 66 months
- Denominator: January 2020 to January 2027 = 84 months
- Community fraction: 66/84 = 78.6%
- Each spouse's share: 39.3%
California: The Nelson Formula (Future Incentive)
The Nelson formula, from In re Marriage of Nelson, 177 Cal. App. 3d 150 (1986), applies when the grant is primarily designed to incentivize future performance. The numerator starts at the grant date, not the hire date.
Nelson formula:
Community fraction = (months from grant date to date of separation) ÷ (months from grant date to vesting date)
Using the same timeline:
- Numerator: January 2023 to July 2025 = 30 months
- Denominator: January 2023 to January 2027 = 48 months
- Community fraction: 30/48 = 62.5%
- Each spouse's share: 31.25%
The difference between Hug and Nelson on the same grant: 78.6% vs. 62.5%, a gap of 16.1 percentage points. On a $500,000 RSU tranche, that's roughly $80,500 in value shifting between the community and separate property buckets.
New York: The DeJesus Analysis
New York's approach, set out in DeJesus v. DeJesus, 90 N.Y.2d 643 (1997), is broader and more judicially discretionary. The Court of Appeals laid out a four-step process:
- Classify the purpose. Determine whether the RSUs or options were granted to compensate past services, incentivize future services, or both.
- Past-service portion. If the grant rewards past efforts, treat it as marital property using a coverture fraction measured from the date of hire (or relevant service start) to the commencement of the divorce action.
- Future-incentive portion. For the incentive component, apply a time rule: numerator = months from grant date to commencement of divorce; denominator = months from grant date to first vesting date.
- Equitable distribution. Distribute the marital portion equitably, considering the 13 statutory factors. This is not an automatic 50/50 split.
The New York Law Journal's 2025 analysis of DeJesus highlights that matrimonial attorneys sometimes overlook the first step entirely, applying the DeJesus time rule to compensation that was actually awarded for past services. When the award compensates past work, the entire grant (or that portion) is marital property with no time-rule reduction needed.
Comparison Table
| Formula | State | When Applied | Numerator Start | Denominator End | Example Community Fraction |
|---|---|---|---|---|---|
| **Hug** | California | Grant rewards past/present service | Date of hire | Vesting date | 78.6% |
| **Nelson** | California | Grant incentivizes future performance | Grant date | Vesting date | 62.5% |
| **DeJesus** | New York | Hybrid (past + future analyzed separately) | Hire date (past portion) or grant date (incentive portion) | Vesting date | Varies by judicial discretion; incentive portion uses grant-to-vesting fraction |
Each grant in a portfolio must be analyzed individually. A single employer might issue one RSU tranche as a hiring bonus (past service, Hug-like treatment) and another tied to a two-year retention cliff (future incentive, Nelson or DeJesus step 3). Couples working with an experienced family law attorney can map each grant to the correct formula before disagreements arise.
How are stock options valued when a couple divides them?
Valuation methods range from intrinsic value (current stock price minus the exercise price) to the Black-Scholes option pricing model, depending on whether the options are vested, publicly traded, and how much volatility exists. The right method matters because a $200,000 intrinsic value and a $280,000 Black-Scholes value on the same option can produce a material gap in what each partner receives.
Intrinsic value is the simplest calculation: if you hold options with a $25 strike price and the stock trades at $75, the intrinsic value is $50 per share. Courts in both states sometimes use this as a conservative floor, especially for vested options that can be exercised immediately.
Black-Scholes is a mathematical model that accounts for stock volatility, time to expiration, the risk-free interest rate, and the current stock price. It typically produces a higher valuation than intrinsic value because it captures the "time value" of the option, the chance the stock will appreciate further before expiration. Courts commonly apply Black-Scholes to unvested options where exercise may be years away.
Present-value analysis discounts the expected future payout to today's dollars, factoring in the probability that options will vest (the employee might leave, or performance targets might not be met).
Division Mechanics
Because unvested equity can't be transferred or sold, courts and couples typically use one of three approaches:
- Deferred distribution (if-and-when). The titled spouse holds the non-titled spouse's share until vesting. When the options vest and are exercised (or RSUs vest), the titled spouse pays the non-titled spouse their share of the net proceeds after taxes. Both partners share the upside and the risk.
- Offset. The couple assigns a present value to the unvested equity and offsets it against other assets. For example, one spouse keeps $300,000 in unvested RSUs, and the other receives $300,000 in home equity or retirement funds.
- Buyout. The titled spouse pays a lump sum now to "buy out" the other's interest, using an agreed-upon valuation method.
Tax Considerations
The net value of equity compensation depends heavily on tax treatment, and the differences are significant (2025 rates):
| Equity Type | Tax Event | Tax Rate |
|---|---|---|
| **ISOs** | Taxed at sale (if holding period met: 2+ years from grant, 1+ year from exercise) | Long-term capital gains: 15%-20% federal |
| **NQSOs** | Taxed at exercise on the spread (market price minus strike price) | Ordinary income: up to 37% federal |
| **RSUs** | Taxed at vesting on fair market value | Ordinary income: up to 37% federal |
A couple dividing $400,000 in NQSOs needs to account for roughly $100,000-$148,000 in federal income tax (plus state taxes of up to 13.3% in California or 10.9% in New York). Splitting the pre-tax number 50/50 without considering the tax bill shortchanges whoever ends up paying the IRS. Working with a CPA alongside a family law attorney ensures both partners understand the after-tax reality.
How a prenup can address stock options and equity compensation
A prenup lets couples define in advance how options, RSUs, and founder equity will be classified, valued, and allocated, so both partners have clarity before any shares vest. This is one of the most valuable things a couple can do together when one or both partners work in tech, finance, or a startup environment where equity is a major component of compensation.
Without a prenup, you're defaulting to whichever coverture formula a judge selects, and as the Hug vs. Nelson comparison above shows, that choice alone can move $80,000 or more on a single $500,000 grant. A well-drafted prenuptial agreement can specify:
- Whether stock options granted during the marriage are treated as shared or individual property
- Which valuation method (intrinsic value, Black-Scholes, or another agreed approach) will be used
- How unvested equity will be handled if the partnership ends
- Whether future grants follow the same rules or are revisited periodically
- How tax obligations are allocated when options are exercised or RSUs vest
This isn't about one partner giving something up. It's about both partners creating alignment on how equity compensation fits into their shared financial life. A startup founder whose pre-marriage sweat equity is worth $2 million today might want to clarify that those shares remain individual property, while agreeing that any new grants issued during the marriage are shared. The non-founder partner, in turn, gets transparency and a defined stake rather than uncertainty.
Why DIY templates fall short on equity
Generic prenup templates priced at $0-$700 rarely include provisions for unvested stock options, RSU tranches, or the specific coverture formulas that courts apply. They might include a line about "investment accounts" but miss the distinction between ISOs and NQSOs, or fail to address what happens when a grant is made during the marriage but vests over four years.
Neptune's lawyer-led online prenup process pairs couples with family law attorneys who have 20+ years of experience, along with CFPs and CPAs who understand equity compensation structures. The team works with both partners to draft provisions that reflect the couple's actual financial picture, including current grants, anticipated future compensation, and the tax implications of each equity type. Lawyer-drafted prenups typically run $4,000-$10,000+, but that investment is a fraction of the $15,000-$50,000+ that forensic valuation disputes over equity compensation can cost if the issue ends up in court.
The goal isn't to plan for a bad outcome. It's to build a shared financial framework that accounts for the complexity of modern compensation, so both partners can focus on growing together rather than worrying about what-ifs.
Frequently asked questions
Are unvested stock options marital property in California?
Yes. Under California Family Code §760, stock options granted during marriage are community property even if they haven't vested by the date of separation. Courts apply the Hug or Nelson coverture formula to determine what percentage of unvested options belongs to the community versus the employee's separate property.
What is the difference between the Hug and Nelson formulas?
The Hug formula measures the community share from the employee's date of hire to the date of separation, divided by the period from hire to vesting. It applies when the grant compensates past service. The Nelson formula starts the numerator at the grant date instead of the hire date, producing a smaller community fraction. It applies when the grant incentivizes future performance. On a $500,000 grant, the difference between the two formulas can exceed $80,000.
How does the DeJesus formula work in a New York divorce?
The DeJesus formula, from DeJesus v. DeJesus (90 N.Y.2d 643, 1997), uses a four-step analysis. First, the court determines whether the equity award compensates past services, incentivizes future services, or both. Past-service portions are classified as marital property outright. Future-incentive portions use a time-rule fraction: numerator equals months from grant date to commencement of the divorce action, denominator equals months from grant date to vesting. The marital portion is then distributed equitably, not necessarily 50/50.
Which is better for equity holders, community property or equitable distribution?
Neither system is inherently better; it depends on your circumstances. Community property (California) provides predictability with a 50/50 split of the marital share. Equitable distribution (New York) gives judges flexibility to consider 13 factors, which can result in a split ranging from 40/60 to 70/30 or beyond. A partner with lower income may benefit from equitable distribution's flexibility, while a higher-earning partner with significant equity might prefer the clarity of community property rules or, better yet, a prenup that defines the terms in advance.
How are RSUs valued when a couple divides them?
RSUs are typically valued at the fair market value of the underlying shares on the vesting date, since they don't have an exercise price like stock options. For unvested RSUs, courts may use the current stock price as a reference, apply a discount for the risk of forfeiture (if the employee leaves before vesting), or defer distribution until the RSUs actually vest. The after-tax value is what matters, since RSUs are taxed as ordinary income at vesting, at rates up to 37% federal (2025) plus state income tax.
Who pays the taxes when divided stock options finally vest?
In most deferred-distribution arrangements, the titled spouse (the employee) pays the taxes when options are exercised or RSUs vest, then distributes the non-titled spouse's share of the net after-tax proceeds. This means both partners share the tax burden proportionally. Couples can also negotiate a different tax allocation in a prenup or settlement agreement, but the IRS will assess the tax liability against the person whose W-2 or 1099 reports the income.
Can a prenup determine how stock options are divided?
Yes. A prenup can specify whether stock options and RSUs granted during the marriage are treated as shared or individual property, which valuation method will be used, and how unvested equity is handled. Both California and New York allow couples to exclude certain assets from the marital estate through a prenuptial agreement, as confirmed by the NYC Bar's marital property guidance. The agreement needs to be properly drafted by an experienced attorney to hold up in court.
Does it matter which state you file in if you own company equity?
Absolutely. California's community property system and New York's equitable distribution framework produce different outcomes on the same set of facts. The coverture formulas (Hug/Nelson vs. DeJesus) use different starting points for calculating the marital share, and New York judges have broader discretion in dividing the marital portion. If you've relocated between states during your marriage, the analysis becomes more complex, and working with an attorney licensed in the relevant jurisdiction is essential.
What happens to founder equity when a marriage ends?
Founder equity is treated like other stock interests: the portion acquired or earned during the marriage is generally marital or community property. Pre-marriage founding shares are typically separate property, but appreciation during the marriage (especially if driven by the founder's active efforts) may be subject to division. Valuing a private company's equity is more complex than public stock because there's no market price, so forensic accountants often use discounted cash flow models or comparable-company analyses. A prenup can define how founder shares are classified and valued, avoiding a costly dispute later.
Written by
Ronke Oyekunle
Co-Founder & COO, Neptune
Reviewed by
Michael Cotugno, Esq.
Managing Partner, Neptune Legal · 30+ years practicing family law
Michael has been practicing family law for more than 30 years and as Managing Partner of Neptune Legal, he is widely recognized for his expertise in premarital agreements and estate plans. After spending the first two decades of his career handling family law litigation, he saw firsthand the emotional and financial costs couples often face when issues are not clearly addressed early on. This experience led him to focus his practice on helping clients proactively create thoughtful, well-structured agreements.