What Can and Cannot Be Included in a California Prenup?

A prenuptial agreement allows couples to define financial expectations before marriage. While often associated with high-net-worth individuals, prenups can benefit couples at many income levels — particularly when business interests, real estate, or prior assets are involved.

However, not everything can legally be included in a California prenuptial agreement.

At Colliss‎ Law APC, we help clients draft thoughtful, enforceable agreements tailored to their unique circumstances. Understanding what is legally permissible is essential to ensuring your prenup will stand up in court if ever challenged.

What Can Be Included in a California Prenup?

California law allows couples to address a wide range of financial matters in a prenuptial agreement.

1. Property Ownership

A prenup can specify:

What property will remain separate property
How marital property will be divided
How future property acquisitions will be treated

This is particularly important for individuals entering marriage with substantial assets.

2. Business Interests

A prenup may define:

Ownership rights in an existing business
How business growth will be classified
Buyout provisions in the event of divorce

For business owners in Walnut Creek and Contra Costa County, this protection can be critical.

3. Spousal Support (With Limitations)

Couples may address spousal support in a prenup. However:

The agreement must be entered into voluntarily
Both parties must have independent legal representation (or knowingly waive it)
The terms cannot be unconscionable at the time of enforcement

Spousal support waivers are subject to heightened scrutiny in California courts.

4. Debt Allocation

A prenup can clarify responsibility for:

Pre-marital debt
Student loans
Business liabilities
Credit card obligations

This can help prevent future disputes.

5. Inheritance and Estate Planning

Prenups often address:

Protection of inheritances
Rights to life insurance proceeds
Estate planning coordination

These provisions are especially important in second marriages or blended families.

What Cannot Be Included in a California Prenup?

While prenuptial agreements offer flexibility, certain topics are prohibited or unenforceable.

1. Child Custody and Child Support

A prenup cannot predetermine:

Child custody arrangements
Child support obligations

Courts must decide these issues based on the child’s best interests at the time of divorce.

2. Illegal or Unfair Provisions

Courts will not enforce provisions that are:

Illegal
Grossly unfair
Signed under coercion
Lacking full financial disclosure

Full transparency is required during the drafting process.

3. Personal Lifestyle Clauses (In Some Cases)

Provisions regarding personal matters — such as household responsibilities or behavior expectations — may not be enforceable in court.

While some couples include lifestyle clauses, courts typically focus only on financial terms.

Requirements for an Enforceable California Prenup

For a prenuptial agreement to be enforceable in California:

It must be in writing
It must be signed voluntarily
There must be full financial disclosure
Each party must have sufficient time to review (at least seven days before signing after receiving final draft)
The agreement must not be unconscionable

Independent legal counsel for each party is strongly recommended — and often critical when addressing spousal support.