Drahos Formula Arizona Community Lien

When Community Money Touches Separate Property

You owned a house before you got married. During the marriage, both paychecks went toward the mortgage. Now you're divorcing and your spouse says they're entitled to a share of that property.

They're partially right. The house remains your separate property in Arizona, but the community acquires an equitable lien for the value it contributed. Courts calculate that lien using the Drahos/Barnett formula, confirmed as the mandatory starting point by the Arizona Supreme Court in Saba v. Khoury (2022).

The Formula

Community Lien = C + (C ÷ B × A)

Three variables determine the result:

C = Community contributions. The total amount of community funds used to reduce mortgage principal and fund value-enhancing improvements during the marriage. Taxes, insurance premiums, and mortgage interest do not count — only principal reduction and improvements that add value. This is the Valento rule.

B = Base value. The appraised fair market value of the property on the date of marriage. Under the Barnett v. Jedynak refinement, if premarital appreciation occurred (you bought the house at $200,000 and it was worth $250,000 by your wedding date), B is $250,000 — the value when the community began, not the original purchase price.

A = Appreciation during the marriage. The difference between the property's value on the date of marriage and its value on the date of service of the divorce petition. If the house was worth $250,000 at marriage and $400,000 at service, A = $150,000.

Running the Numbers

Say you bought a house for $225,000 before the marriage. By the wedding date it was worth $260,000. During a 10-year marriage, community income paid $65,000 toward mortgage principal and you used $12,000 in community funds for a kitchen remodel. At the date of service, the house appraises at $410,000.

• C = $65,000 + $12,000 = $77,000
• B = $260,000 (value at marriage)
• A = $410,000 − $260,000 = $150,000
• Community Lien = $77,000 + ($77,000 ÷ $260,000 × $150,000) = $77,000 + $44,423 = $121,423

Each spouse is entitled to half the lien, so the non-owner spouse receives approximately $60,712. The property owner keeps the house and the remaining equity.

Disclaimer Deeds Change the Calculation

If a disclaimer deed was executed during the marriage — where one spouse formally relinquished community interest in the property at the time of purchase — the appreciation variable (A) is measured from the date the disclaimer deed took effect, not from the date of marriage.

This can significantly reduce the lien if the property appreciated substantially between the marriage date and the disclaimer deed date.

What Doesn't Create Lien Rights

Courts are specific about what counts as a community contribution:

• Mortgage interest payments — no lien rights
• Property taxes — no lien rights
• Homeowner's insurance — no lien rights
• Routine maintenance (repainting, landscaping, fixing a broken pipe) — no lien rights
• Cosmetic upgrades that don't add measurable value — debatable, but generally no

Only principal reduction on the mortgage and improvements that demonstrably increase the property's fair market value qualify.

Proving Your Numbers

Both spouses need documentation. The property owner needs records showing the home's value at marriage (an appraisal or comparable sales), the mortgage balance at marriage and at service, and evidence of any improvements funded by separate property. The non-owner spouse needs records of community income, mortgage payment histories, and receipts for improvements.

If you're calculating a community lien in your Arizona divorce, the Arizona Divorce Financial Split Guide includes a step-by-step Drahos lien calculator worksheet that walks you through gathering and plugging in each variable.

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