Marital Property Regime and Buying a Home in Mexico

When a married couple decides to buy a house or condo, the same question almost always comes up at the notary's office: "Under which regime did you get married?" The answer is not a minor formality, because the marital property regime determines who owns the property, who must sign the deed (escritura), how any related debts are divided, and what happens to the home if the marriage ends. If you are about to buy a home while married, or you already bought one and have questions about your situation, this guide explains clearly how community property (sociedad conyugal) and separate property (separación de bienes) work, and what each means in practice when acquiring real estate in Mexico.

Marital property regimes in Mexico

When you marry in a civil ceremony in Mexico, the law requires you to choose a property regime that will govern how assets are managed during the marriage. Although the exact names and some details vary by state, in practice there are two main models: community property (sociedad conyugal) and separate property (separación de bienes). Some states also allow mixed regimes, where certain assets are shared and others remain separate according to what the marital agreement (capitulaciones matrimoniales) establishes.

In most cases, this choice is made at the time of the wedding before the Judge or Civil Registry official (Registro Civil), and it is recorded on the marriage certificate. It is possible to change regimes after marriage, but it requires a formal procedure before a notary public and, depending on the state, before the Civil Registry itself. If you are going to buy a home while married, the first thing to verify is which regime you chose, because that determines how the deed will be drafted.

Community property (sociedad conyugal) and buying a home

Under community property (sociedad conyugal), assets acquired during the marriage are, in principle, considered jointly owned by both spouses, regardless of who contributed the money to buy them. This means that if you buy a house while married under this regime, it is customary for both spouses to appear as owners on the deed, or for the deed to expressly state that the property belongs to the community property.

The marital agreement (capitulaciones matrimoniales), the document that sets out the specific rules of the community property, can specify which assets enter the community and which are excluded, for example, those one spouse already owned before marrying or those received by inheritance or gift during the marriage. That is why it's worth reviewing that document, if one exists, before automatically assuming that "everything belongs to both of us, 50/50."

In practice, buying a home under community property generally requires:

• An up-to-date marriage certificate showing the chosen regime.
• The marital agreement (capitulaciones matrimoniales), if one was executed, to verify any particular rules.
• Official ID and RFC (tax ID) for both spouses.
• Both spouses' signatures on the deed, unless a notarial power of attorney authorizes one to act on behalf of the other.

Separate property (separación de bienes) and buying a home

Under separate property (separación de bienes), each spouse keeps individual ownership of whatever they acquire, even during the marriage. If you buy a house with your own funds and you are under this regime, in principle you can put the deed in your name alone, without your spouse having to appear as an owner or sign the purchase deed as a buyer.

However, there are important nuances that often surprise couples:

• Even if the property is yours alone, some notaries and public registries ask for the spouse's consent when the home is the marital or family residence, especially if you later want to sell or encumber it.
• If both spouses contribute money to the purchase and wish to do so, they can voluntarily decide to hold title as co-owners, even if the regime is separate property. This no longer depends on the marital regime, but on an agreement between the two of you about how to divide ownership.
• Assets acquired under separate property are not automatically divided in a divorce, unless the other spouse can show a financial contribution or there is a different agreement.

Keep in mind that these general rules may vary from state to state and depending on what each couple's specific marital agreement says. No table replaces having a notary review your marriage certificate.

Comparison: community property vs. separate property

Neither regime is "better" in absolute terms; each has advantages and risks depending on the couple's situation. For those weighing a first home purchase together, it's worth thinking through these points before deciding how to hold title.

Your marital regime and the mortgage

If you plan to finance the purchase with a mortgage, your marital regime also affects the process, though differently depending on the institution. Many banks and Infonavit allow you to apply for the loan individually, with one spouse as the borrower, or jointly, combining both incomes to qualify for a larger amount. If your spouse is also an Infonavit member, it's worth looking at how the Infonavit spousal loan (crédito conyugal) works as an alternative for combining both loans.

In general terms, under community property it is more common for the bank to require both spouses to appear as borrowers or at least as joint guarantors (obligados solidarios), while under separate property it is more feasible for just one spouse to be the borrower and the owner. Even so, each institution has its own policies, so it's wise to ask the bank or Infonavit directly how they handle these cases before starting your step-by-step mortgage application.

What happens to the house in a divorce

One of the reasons it's worth understanding your marital regime well before buying is what happens if the marriage ends. Under community property, the home acquired during the marriage is usually considered part of the shared estate and must be divided between both spouses according to the marital agreement, either by selling it and splitting the proceeds, or by transferring one spouse's share to the other.

Under separate property, the home in principle stays with whoever bought it and put the deed in their name. However, this is not absolute: if the other spouse can show they contributed financially to the purchase, the loan payments, or significant improvements to the property, they could claim compensation, though not necessarily co-ownership of the property. These cases are usually resolved by reviewing payment receipts, transfers, and documented contributions.

Under either regime, if the couple has children and the home is the family residence, it is common for a judge to grant temporary use of the house to the spouse who has custody, even if legal ownership belongs to the other. This is independent of who owns the property on the deed, and is driven mainly by the best interests of the children.

What if we're not married: concubinage or common-law union

All of the above applies to couples married in a civil ceremony, but a significant share of people who buy a home together are not married: they live in concubinage (concubinato) or a common-law union. In that case there is no marital regime to define before the Civil Registry, and the division of the home is not governed by the rules of community property or separate property, but by what the deed says and, in some states, by the legislation on concubinage.

If you buy together without being married, the best practice is for the deed to clearly reflect each person's share, whether equal or in the proportion that corresponds to what each contributed toward the down payment and monthly payments. Unlike marriage, there is no automatic legal presumption here that the property belongs to both of you simply because you live together; it's wise to document it from the moment of purchase.

Some states recognize concubinage as creating rights and obligations similar to those of marriage after a certain period of living together or if there are children in common, which can affect the assets accumulated as a couple. Since these rules vary considerably from one state to another, if you buy a home in a common-law union, consult a notary or family law attorney in your state before signing, and consider formalizing a co-ownership agreement before a notary that spells out what happens to the house if the relationship ends.

Frequently asked questions

Can I buy a house in my name only if I'm married?

It depends on your marital regime. Under separate property, in principle you can put the deed in your name alone. Under community property, the property is usually considered part of the couple's shared estate, so the appearance or consent of both spouses is typically required. Confirm this with the notary handling your transaction.

How do I know which marital regime I married under?

The regime is recorded on your marriage certificate. If you don't remember or don't have the certificate handy, you can request an updated copy from the Civil Registry where you were married. That document is essential for any home purchase if you are married.

Can I change my marital regime after marriage in order to buy a house?

Yes, in most states it is possible to modify the marital regime through a procedure before a notary, although the requirements and timelines vary by state. If you're thinking of doing so before a major purchase, it's wise to plan the process well in advance, since it can take weeks to be formalized.

What happens to the house if we divorce and we bought under community property?

Generally, a home acquired during the marriage under community property is considered part of the shared estate and must be divided between both spouses, either by selling it and splitting the proceeds or by transferring one spouse's share to the other. The exact details depend on the marital agreement and on any divorce settlement.