Prenuptial Agreements for Business Owners in Oregon (2026 Guide)

A prenup for a business owner in Oregon is a written contract under the Uniform Premarital Agreement Act, codified at Or. Rev. Stat. § 108.700 to 108.740, that classifies your company and its future appreciation as separate property. Without one, Oregon courts can divide premarital business equity under Or. Rev. Stat. § 107.105 as "just and proper." The 2026 court filing fee for the resulting dissolution is $301.

Oregon is an equitable distribution state, which makes a prenup business owner Oregon strategy essential for entrepreneurs. Even a business you started years before your wedding is not automatically safe: Oregon courts can divide the appreciation that occurred during the marriage and, in some cases, the premarital equity itself. A properly drafted entrepreneurial prenup converts that legal uncertainty into a predictable, enforceable outcome.

Key Facts: Oregon Prenups and Divorce

Why Business Owners in Oregon Need a Prenup

Business owners in Oregon need a prenup because the state can divide premarital business equity, not just marital appreciation, under Or. Rev. Stat. § 107.105. Oregon is one of a minority of states that may divide assets earned before the marriage regardless of title. A prenup is the only reliable tool to keep an LLC, corporation, or partnership interest fully separate at divorce.

The core risk is Oregon's broad "just and proper" division standard. Unlike a community property state where premarital assets are clearly separate, Oregon judges have wide discretion to reach back into separately owned property. When a business grows during the marriage, the appreciation becomes a target: even if you started the company before the wedding, the court could award your spouse a share of the increase in value that occurred during the years you were married. For a fast-growing LLC, that appreciation can dwarf the original equity.

A second risk is commingling. In Kunze and Kunze, 337 Or 122, 92 P3d 100 (2004), the Oregon Supreme Court held that separately acquired assets may be pulled into the marital estate if commingling shows an intent to make the asset joint property. Depositing business revenue into a joint account, using marital savings to fund expansion, or having a spouse work unpaid in the business all create commingling arguments. A business valuation prenup eliminates these disputes by defining, in advance, exactly what stays separate.

How Oregon's Uniform Premarital Agreement Act Works

Oregon adopted the Uniform Premarital Agreement Act in 1987, codified at Or. Rev. Stat. § 108.700 to 108.740. A premarital agreement must be in writing and signed by both parties, is enforceable without consideration, and becomes effective upon marriage. No witnesses are required, though notarization is recommended. Parties may contract over property rights, debt, and spousal support.

The statute defines a "premarital agreement" as an agreement between prospective spouses made in contemplation of marriage and to be effective upon marriage (Or. Rev. Stat. § 108.700). The substantive powers granted to couples appear in Or. Rev. Stat. § 108.710, which lets parties contract regarding the rights and obligations in any property, the disposition of property on separation or dissolution, the modification or elimination of spousal support, and the ownership of life insurance death benefits. This is the statutory hook that allows an entrepreneurial prenup to classify a business and its appreciation as separate property.

Two limits apply to every Oregon prenup. First, under Or. Rev. Stat. § 108.710, the right of a child to support may not be adversely affected. Second, a spousal support waiver fails if it would leave one spouse eligible for public assistance at separation, in which case the court may order support despite the agreement. After marriage, the agreement may be amended or revoked only by a later written agreement signed by both parties under Or. Rev. Stat. § 108.720.

Making Your Prenup Enforceable: The ORS 108.725 Standard

An Oregon prenup is unenforceable only if the challenging spouse proves, under Or. Rev. Stat. § 108.725, that they did not sign voluntarily, or that the agreement was unconscionable AND they received no fair financial disclosure and did not waive disclosure in writing. Whether an agreement is unconscionable is decided by the court as a matter of law. Absent those conditions, the agreement is enforceable.

This two-part test makes financial disclosure the single most important protection for a business owner. Because your company is your most valuable asset, you should attach a detailed schedule of assets disclosing the business, its estimated value, capital accounts, and known liabilities. Oregon courts have defined signing "voluntarily" as requiring knowledge of the agreement's terms and the property affected, plus the absence of coercion, intimidation, or undue pressure. A spouse who fully understood a fairly disclosed LLC interest cannot easily later claim surprise.

Timing and independent counsel drive enforceability in practice. Courts scrutinize agreements signed days before the wedding, where one party had no realistic chance to consult a lawyer. To protect a business valuation prenup, present the draft well before the ceremony, give your fiancé time to review it, and encourage independent legal representation. While Oregon does not require separate attorneys, an LLC prenup signed by two represented parties after full disclosure is far harder to attack under the Or. Rev. Stat. § 108.725 voluntariness and unconscionability prongs.

What Happens to a Business Without a Prenup

Without a prenup, an Oregon court divides your business under Or. Rev. Stat. § 107.105 using a rebuttable presumption of equal contribution. A business started before marriage begins as separate property, but marital appreciation and commingled funds become divisible. Courts value the business at fair market value, often requiring a formal expert appraisal that can cost several thousand dollars.

The equal-contribution presumption is the central battleground. Oregon presumes both spouses contributed equally to property acquired during the marriage, regardless of whose name is on the title or who earned the income. A spouse who stayed home is treated as contributing as much as the earning spouse. To shield premarital business equity, you must rebut this presumption with evidence of when the business was created, its pre-marriage value, how it grew, and each spouse's direct and indirect contributions. That evidentiary fight is expensive and uncertain.

Goodwill compounds the exposure. Under case law interpreting Or. Rev. Stat. § 107.105, goodwill may be considered when an interest in a corporation is among the marital assets to be divided. A professional practice or established company can carry substantial goodwill value beyond its hard assets. Once valued, courts typically award the business to the operating spouse and offset the other spouse with comparable assets or an equalization judgment, or order a structured buyout paid over time. A prenup replaces all of this with a fixed, agreed result.

Drafting an Entrepreneurial Prenup: Key Clauses

An effective entrepreneurial prenup in Oregon should classify the business and 100% of its future appreciation as separate property, waive any claim to business income, restrict ownership transfers, and require fair compensation for a spouse who works in the company. These clauses directly counter the appreciation and commingling theories that Oregon courts use to divide premarital business interests under Or. Rev. Stat. § 107.105.

The most important provision addresses appreciation. Because Oregon can divide the increase in a business's value during marriage, your agreement should state that any growth, whether from your active efforts or passive market forces, remains your separate property. Pair this with an income clause specifying how earnings, distributions, and reinvested profits are characterized. A business valuation prenup may also lock in a valuation method or formula, so that if any value ever is shared, the parties avoid a costly battle of competing experts over fair market value and goodwill.

Protective structural clauses round out a strong LLC prenup. Limit the business owner's exposure to debts the company incurs, prohibit any transfer of an ownership interest to the spouse, and require the company to pay a competitive salary to a spouse who performs work. Underpinning all of it, the agreement should obligate you to keep accurate, separate business records and avoid commingling business funds with marital accounts. These operational commitments preserve the separate character that makes the legal classification enforceable.

Postnuptial Agreements for Oregon Business Owners

If you missed the chance to sign a prenup, Oregon recognizes postnuptial agreements between current spouses, which can protect a business acquired or grown during the marriage. Postnups are generally held to the same fairness and disclosure standards courts apply to prenups under Or. Rev. Stat. § 108.725, with heightened scrutiny because spouses owe each other a duty of good faith.

A postnuptial agreement is common when a spouse launches or buys a business after the wedding, receives a business interest as a gift or inheritance, or wants to memorialize how an existing company will be treated. Because the spouses are already married, courts often look harder at whether the deal is fair and whether both parties had full information and independent advice. The protections that strengthen a prenup, complete financial disclosure, independent counsel, adequate time to review, and the absence of pressure, apply with even greater force to a postnup.

The operational rules matter just as much after the agreement is signed. A postnup that classifies a business as separate can be undermined if the owner then commingles funds or treats the company as a joint enterprise, reviving the Kunze commingling analysis. To protect business prenup-style separation through a postnup, maintain segregated business accounts, document the company's value at signing, pay yourself a market salary, and compensate any spouse who works in the business. Consistent conduct preserves the separate character the agreement establishes.

Oregon Divorce Costs and Timeline for Business Owners

The 2026 Oregon dissolution filing fee is $301 per party under Or. Rev. Stat. § 21.155, but business-owner divorces carry larger costs from valuation experts, typically several thousand dollars, plus attorney fees for litigating appreciation and commingling. As of January 2026, verify the current filing fee with your local circuit court clerk, because amounts can change.

Beyond the base court fee, business-owner cases generate predictable expenses. A formal business valuation by a qualified expert is frequently required and is the single largest add-on cost when the value or characterization of the company is disputed. Process server fees run $30 to $150, certified copies of the judgment cost roughly $5 to $25 each, and mediation, if used, can run $100 to $300 per hour. Fee deferrals and waivers are available for petitioners at or below 125% of the federal poverty level, which equals $19,506 for a single person in 2026.

Timing depends heavily on whether the business is contested. The table below contrasts a streamlined uncontested case, where a prenup has already resolved the business question, against a contested case requiring valuation and trial.

Residency is a threshold requirement before any of this begins. Under Or. Rev. Stat. § 107.075, if you married in Oregon, either spouse need only be a current resident; if you married elsewhere, one spouse must have lived in Oregon continuously for six months before filing. The petition is filed in the circuit court of the county where either spouse resides.