Mexican citizenship by descent: a guide for people born in the US

If you were born in the United States and one of your parents is Mexican, you have a constitutional right to Mexican nationality — and with it a Mexican passport, the right to vote, the freedom to live and work in Mexico without immigration restrictions, and new property and tax options.

The good news: this is not about "getting" a new nationality, but about recognising one you have had since birth. The less good news: the process has several steps and, handled badly, can take more than a year.

The legal basis: article 30 of the Constitution

Article 30 lists who is Mexican by birth. It includes people born abroad to a Mexican father or a Mexican mother. Until 2021 the text required that parent to have been born in Mexico, which cut off the second generation born abroad; a 2021 constitutional reform removed that limit, so a parent who is Mexican by birth is enough even if they were themselves born outside Mexico — provided they are registered as Mexican.

In practice this means that if at least one of your parents is Mexican, you are Mexican by birth, wherever you were born. It is a nationality you have held since birth, even if your birth was only ever registered in another country.

What registering unlocks

The process consists of registering your birth in Mexico, which unlocks:

• A Mexican birth certificate issued by the Civil Registry.
• CURP, your Mexican population registry number.
• RFC, from the SAT, if you will carry out economic activity in Mexico.
• A Mexican passport, with full consular rights.
• An INE voter card, if you want to vote in Mexico.
• The right to live and work in Mexico with no visa or residency permit.
• Property without a trust: Mexicans can hold title directly in the coastal and border restricted zone, with no fideicomiso. See our property guide.

Dual nationality: the key detail

Since the 1998 constitutional reform, Mexico explicitly allows dual nationality, and a Mexican by birth cannot be deprived of it. That means:

• You keep your US citizenship when you are recognised as Mexican.
• You hold a US passport and a Mexican passport at the same time.
• In Mexico you are treated as Mexican; in the US you keep every right of a citizen.

Who qualifies

• Your father or mother was born in Mexico, whatever their current nationality.
• Your father or mother was born abroad but is registered as Mexican by birth — in other words, you have Mexican grandparents and your parent was registered.
• Your father or mother is Mexican by naturalisation, which is covered by a separate clause of article 30.

The second case matters: if your parent was born in the US but was registered as Mexican by your grandparents, you can be registered too. If your parent was never registered, they usually need to do it first, and then you register through them.

Documents you will need

Yours

• Your US birth certificate, apostilled by the Secretary of State of the state where you were born, with an official Spanish translation where required.
• A valid passport.
• Additional official ID, such as a driver's licence or state ID.

Your Mexican parent's

• Their Mexican birth certificate, recently issued.
• Valid Mexican ID: INE card, Mexican passport or consular ID (matrícula consular).
• Their CURP.

Depending on the case

• Marriage certificates or other records linking surnames, if names changed along the way.
• A death certificate, if your Mexican parent has passed away.
• The child's documents, if you are registering minors.

The process, step by step

Option A: a Mexican consulate abroad

1. Book an appointment at the Mexican consulate with jurisdiction over your address. Waits can run to several months.
2. Present the documents on the day. The consulate verifies them.
3. Consular birth registration: the consulate issues a Mexican birth certificate recording your actual birth.
4. CURP, straight away.
5. Mexican passport, once you have the certificate and CURP — usually a separate, quicker appointment at the same consulate.

Total time: typically two to six months from the first appointment to passport in hand.

Option B: a Civil Registry in Mexico

If you are visiting or living in Mexico, you can register directly at a competent Civil Registry office, then obtain your CURP and apply for a passport at the Ministry of Foreign Affairs. Local offices differ in experience with these cases, which is where having someone who knows the right office saves weeks.

What it costs

Government fees are updated every year; confirm them with your consulate.

Tax implications of dual nationality

Dual nationality does not by itself mean paying tax in both countries. What decides your Mexican tax position is tax residency, not nationality. The US is the exception, because it taxes its citizens wherever they live.

You live in the US and hold a Mexican passport

You remain a US tax resident. The Mexican passport creates no new Mexican tax obligations, unless you have Mexican income or assets that generate them.

You move to Mexico and keep US citizenship

You will likely become a Mexican tax resident under article 9 of the Federal Tax Code, while still filing a 1040 with the IRS on worldwide income as a US citizen. The US–Mexico treaty prevents paying twice when applied correctly. See our tax residency guide.

You own property or a business in Mexico

As a Mexican you can hold coastal and border property directly, without a trust, and you have estate and structuring options a foreigner does not.

Common mistakes

• Assuming it costs you your US citizenship. It does not.
• Not apostilling the US certificate. Without an apostille neither the consulate nor the Civil Registry will accept it.
• Informal translations. Where a translation is required, it must be done by an authorised translator, not a bilingual friend.
• Ignoring the tax side. If Mexican nationality changes your plans — buying property, opening a company, moving — get tax advice first. Changes made afterwards cost more.

Bottom line: a right, not a favour

Registering your Mexican nationality is not an immigration procedure or a concession: it is recognition of a right you already had. The process only produces the documents. But those documents open a Mexican passport, the vote, freedom of movement and new property and tax options — without giving up your US citizenship.