Montana Automatic Economic Restraining Order (AERO): What It Means for Your Divorce

The moment you file a dissolution petition in Montana, a legal freeze snaps into place over virtually every financial move you and your spouse can make. This is the Automatic Economic Restraining Order — AERO — and violating it can result in criminal charges under MCA § 45-5-626, contempt sanctions, and an unfavorable property award at trial.

Understanding exactly what the AERO allows and prohibits is the difference between navigating your dissolution smoothly and accidentally committing a criminal offense with your own bank account.

What the AERO Actually Prohibits

The AERO is embedded in the Summons (form MP-400) issued by the Clerk of District Court. Under MCA § 40-4-126, it binds the petitioner immediately upon filing and the respondent immediately upon service. Both parties are restrained from:

• Transferring, selling, or hiding property — whether jointly or separately held, without written consent from the other party or a court order
• Changing insurance beneficiaries — life, health, auto, and disability policies covering either spouse or minor children stay locked
• Draining or closing accounts — joint credit lines, bank accounts, retirement funds, and pensions cannot be modified, closed, or cashed out
• Taking on unreasonable new debt — no large purchases, new credit cards, or unnecessary loans

The AERO does not mean you cannot spend any money at all. Under MCA § 40-4-121(3)(a), you may still pay for necessities of life — groceries, rent, utilities, medical care — and conduct normal business operations. But extraordinary expenses require 5 business days' written notice to the other party before you incur them.

When the AERO Takes Effect

The timing matters because the AERO applies asymmetrically at first:

• For the petitioner: binding the moment the petition is filed with the Clerk of Court
• For the respondent: binding the moment they receive formal service of process

This gap creates a practical concern. If you are the petitioner, you are bound by the AERO before your spouse even knows about the filing. If you are the respondent, the AERO kicks in the instant the sheriff hands you papers or you sign the mail acknowledgment.

Joint petition filers (using MP-115 or MP-116) are both bound from the date of filing since both are co-petitioners.

What You Can Still Do Under the AERO

Despite the restrictions, daily financial life continues:

• Pay regular monthly bills (mortgage, utilities, insurance premiums)
• Buy groceries and household necessities
• Make normal business expenditures in the usual course
• Pay for required parenting education classes
• Cover children's medical and school expenses

The key test is "necessities of life" and "usual course of business." A $200 grocery run is fine. A $15,000 boat purchase is not — unless you provide the required 5-day written notice and your spouse consents or you get a court order.

AERO Violations and Consequences

Montana treats AERO violations seriously. Under MCA § 45-5-626, a violation is a criminal offense. Beyond criminal liability, the court can:

• Hold the violating party in contempt
• Order the return of transferred assets
• Award a larger share of marital property to the non-violating spouse
• Impose attorney fee sanctions

Common violations pro se filers stumble into include emptying a joint savings account "for safekeeping," canceling a spouse's health insurance, or refinancing the family home without consent.

The Financial Disclosure Connection

Alongside the AERO, Montana requires both parties to complete financial disclosures. The Proposed Property Distribution (MP-500) is filed with the court, but the Preliminary Disclosure of Income and Expenses (MP-510) is served directly on the other spouse and never filed publicly — a privacy protection many pro se filers miss.

These disclosures work hand-in-hand with the AERO: the financial picture they reveal becomes the baseline for what both parties must preserve during the dissolution.

How to Handle AERO Disputes

If you need to make a financial move that goes beyond daily necessities — selling a vehicle, accessing retirement funds for an emergency, or changing insurance coverage — you have two options:

1. Get written consent from your spouse documenting the agreed transaction
2. File a motion for temporary orders under MCA § 40-4-121 asking the court to authorize the specific action

Do not assume verbal agreements are sufficient. If your spouse later disputes the transaction, you need written proof to avoid contempt.

The Montana Divorce Filing Process Guide includes AERO-compliant financial worksheets that help you track allowable expenses and document any extraordinary expenditure notices — exactly the paper trail you need if the court questions a transaction.

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