This conversation happens before pre-approval, before property searches, and before any conversation with a real estate agent. It covers every variable that will affect the transaction and the ongoing ownership: each partner's credit score, income, debt obligations, savings available for down payment and reserves, and what each person's financial contribution to the purchase will be.

Specifically: Will the down payment come from both partners equally, or will one contribute more? If contributions are unequal, does that translate to an unequal ownership split? Who will the mortgage payment come from? What happens if one partner's income situation changes after purchase? Couples who skip this conversation and try to sort it out mid-transaction create avoidable friction at exactly the wrong time.

When both partners apply for a joint mortgage in Arizona, the lender does not average the two middle credit scores. It uses the lower of the two. If one partner has a 780 and the other has a 640, the loan is underwritten at 640. The rate and terms reflect 640.

Pulling both credit reports through AnnualCreditReport.com before any lender contact gives the couple a full picture in advance. If one partner has derogatory items or a thin credit file, addressing those before applying can meaningfully improve the loan outcome. If one partner has a strong enough credit score and income to qualify alone, running the mortgage in that partner's name alone avoids the lower-score drag entirely -- with the other partner still appearing on the deed.

Both on mortgage and deed: Both incomes count toward qualification, which increases buying power. Both credit scores are factored -- the lower one drives the rate. Both partners are legally liable for every payment. A missed payment damages both credit profiles.

One on mortgage, both on deed: The borrowing partner alone is legally obligated on the loan. The non-borrowing partner holds ownership rights without loan liability. This can produce a better rate if the credit profile difference is material. The asymmetry must be addressed in the co-ownership agreement.

One on mortgage and deed: Only appropriate when one partner is the sole buyer in every practical sense. If both partners are contributing financially, both should be on the deed. Removing a name from the mortgage after closing requires a full refinance. Removing a name from the deed requires either a buyout or a sale.

Tenants in Common allows unequal ownership splits. Each partner can transfer their interest independently. At death, that interest passes by will or intestate succession -- not automatically to the surviving partner. Creditors of one partner can attach to that partner's interest.

Joint Tenancy with Right of Survivorship passes the property to the surviving partner automatically at death, outside of probate. It requires equal ownership shares. If one joint tenant transfers their interest during their lifetime, the joint tenancy severs and converts to Tenants in Common.

A third option: each partner places their ownership interest into a revocable living trust, with survivorship provisions specified. This is the most flexible structure and protects both the surviving partner and any children from prior relationships. An Arizona real estate attorney -- not the escrow officer at closing -- should make this call.

A co-ownership agreement is a legally binding contract documenting: each partner's ownership percentage and how it was calculated; each partner's obligation for mortgage payments, property taxes, insurance, and maintenance; the procedure for one partner buying out the other; what happens if one partner cannot continue making payments; and how a sale decision is made if partners disagree.

If one partner is on the mortgage and the other is only on the deed, the agreement should specify the non-borrowing partner's payment obligations and what recourse the borrowing partner has if those are not met. If down payment contributions were unequal, the agreement should reflect how that asymmetry is handled at sale or refinance.

This document is prepared by an Arizona real estate attorney before or at closing -- not afterward. The absence of a co-ownership agreement is the primary source of partition actions in Arizona co-ownership disputes -- court proceedings that cost $5,000 to $15,000 and take months to resolve. A co-ownership agreement with a binding arbitration clause eliminates this risk entirely.

Arizona has no divorce process for unmarried couples. The rights of each partner at separation are determined by the deed, the mortgage, and any written agreements in place at the time. The co-ownership agreement must address three scenarios explicitly:

Separation: If neither partner can or will buy out the other and they cannot agree on a sale, a partition action is the primary legal remedy. A binding arbitration clause in the co-ownership agreement avoids court entirely.

Death: If one partner dies without a will and the property is held as Tenants in Common, that partner's interest passes by Arizona's intestate succession laws -- which prioritize legal heirs over an unmarried partner. JTWROS structure, trust ownership, or an Arizona Beneficiary Deed (A.R.S. Section 33-405) eliminates this risk.

Default: If one partner stops contributing to mortgage payments, the other remains fully liable on the loan. Missed payments affect both credit profiles if both are on the mortgage. The co-ownership agreement should specify the cure period, notification requirement, and remedies available to the continuing partner.

For unmarried couples, the baseline estate planning package after a home purchase includes: a will for each partner naming the other as beneficiary of their property interest; durable power of attorney for each partner; healthcare power of attorney and living will designating each partner as healthcare decision-maker; and life insurance sufficient to allow the surviving partner to continue mortgage payments without the deceased partner's income.

Arizona's Beneficiary Deed statute (A.R.S. Section 33-405) allows each partner to record a deed transferring their ownership interest to the other at death, outside of probate, without requiring JTWROS on the title. This is a low-cost tool that closes a significant gap for TIC co-owners who have not established trusts.

The life insurance calculation is direct: can the surviving partner cover the full monthly payment on their income alone? If not, 20-year term life insurance on each partner -- with the other as beneficiary -- is the solution. Premiums for buyers in their 30s typically run $20 to $50 per month per person for $500,000 in coverage. This is not a large expense relative to the risk it mitigates on a $480,000 asset.

The transaction team for an unmarried couple buying in Phoenix should include four professionals: a real estate agent familiar with co-buyer transactions in the target submarket; a lender who can run both joint and single-applicant scenarios and present the rate difference clearly; an Arizona real estate attorney who drafts the co-ownership agreement and reviews the deed language before recording; and an estate planning attorney who handles the post-closing will, power of attorney, and beneficiary deed work.

The escrow officer at closing is not a substitute for the attorney. Title companies in Arizona are legally prohibited from providing legal advice. The escrow officer will execute whatever deed language the parties present -- including language that inadvertently creates TIC when JTWROS was intended. The language on the deed is a legal decision that should be made before arriving at the closing table, with counsel.

In Peoria, Goodyear, and Surprise, the current buyer's market conditions -- homes averaging 72 to 80 days on market, seller concessions in 56% of closings -- give co-buyers time to work through these steps without rushed decisions. The market pressure that caused buyers to skip due diligence in 2021-2022 does not exist right now. Use that time to build the legal and financial structure correctly.