How to Become a Danish Citizen as a US Citizen

To become a Danish citizen as a US citizen, you naturalize through Denmark’s standard process after at least nine years of legal residence, and you keep your American passport because both countries allow dual nationality. The path is demanding: you’ll need to already hold Danish permanent residence, pass a high-level Danish language exam, pass a citizenship knowledge test in Danish, show a long stretch of full-time employment, carry no disqualifying public debt or criminal record, and wait for the Danish Parliament to individually approve your naturalization.

You Don’t Have to Give Up Your US Passport

Denmark changed its nationality law in 2015, and foreign citizens included in a naturalization bill are no longer required to renounce their previous nationality.¹ The US State Department is equally clear on its side: a US citizen may naturalize in a foreign state without any risk to their US citizenship.²

Some Americans living permanently in Denmark still choose to renounce, usually for tax reasons. That’s a separate, voluntary decision covered at the end of this article.

How Long You Need to Live in Denmark

The standard requirement is nine years of continuous legal residence, and you must already hold Danish permanent residence before you apply for citizenship. Two groups qualify sooner:

Recognized refugees and stateless persons: eight years of continuous residence.
Spouses of Danish citizens: six to eight years, depending on how long the marriage has lasted and how long the Danish spouse has held citizenship (at least three years).

“Continuous” means without significant gaps. Short trips abroad won’t hurt you, but extended absences can extend or reset the clock. And the residence has to be legal throughout: you need a valid residence permit for the whole stretch.

Danish Language Proficiency

You need to pass the Prøve i Dansk 3 exam, which sits at B2 on the Common European Framework. That means understanding the main ideas of complex texts, interacting with native speakers with reasonable fluency, and writing clearly on a wide range of subjects. It’s a higher bar than what permanent residency required.³

Language centers around the country offer PD3 courses and exam preparation. If you’ve been in Denmark long enough to qualify on residence, you’ve probably already sat the lower-level exams tied to your permits. Give yourself extra runway for PD3 anyway; the jump in difficulty surprises a lot of applicants.

The Citizenship Test

Alongside the language exam, you have to pass the indfødsretsprøve, a separate knowledge test on Danish history, society, culture, and the political system. It’s given entirely in Danish. Forty-five multiple-choice questions, and you need at least 36 correct to pass. Five of the questions cover Danish values specifically, and you must get at least four of those five right.

The test runs simultaneously at language centers nationwide, typically in a 45-minute window, on set dates during the year. Plan your application timeline around the test schedule. Practice materials and question pools are publicly available.

Employment and Financial Independence

Denmark expects steady, full-time participation in the labor market. Supporting yourself is not enough on its own.

Work History

You need to have been in ordinary full-time employment or equivalent self-employment for at least three years and six months within the last four years. Full-time means an average of at least 30 hours per week. Some employment abroad can count, including postings by Danish companies or public authorities lasting less than two years.³

You must also be connected to the labor market at the moment the naturalization bill is submitted to Parliament. A gap at the wrong time can sink an otherwise complete file.³

Public Assistance

You cannot have received benefits under Denmark’s active social policy or integration laws in the last two years. Over the last five years, you cannot have received such benefits for more than four months in total.⁴

Public Debt

Outstanding debt to public authorities can block your application outright, and the disqualifying list is broader than most people expect. It includes overdue student loans, unpaid child support advanced by public authorities, nursery fees, overpaid housing allowance, court fees, police fines, and even unpaid transit fares of DKK 3,000 or more. Overdue taxes also disqualify you unless you can show the arrears weren’t your fault. If you have any public debt, pay it off or get on a repayment agreement and stay current before you apply.³

Criminal Record

Some convictions permanently bar you from naturalization:

Any unconditional or suspended prison sentence
Convictions for offenses against state security or terrorism
Convictions for gang-related crime
Convictions for violence against children or sexual offenses (with limited exceptions for offenders who were minors at the time)
A sentence of permanent expulsion from Denmark

Lesser offenses don’t disqualify you permanently, but they trigger waiting periods. A fine of DKK 3,000 or more imposes a waiting period of four years and six months from the date of the offense, and multiple penalties add up. If you’re currently charged with anything, your application is frozen until the charge is resolved.³ Traffic fines, unpaid transit penalties, and minor incidents that slipped your mind can surface during the review and push your eligibility date back by years.

Submitting Your Application

Applications go through the official digital portal, and you’ll need MitID (Denmark’s digital identification) to sign and submit. A paper form is available if you’re exempt from digital self-service.¹

Have your documentation ready before you start: valid US passport, proof of permanent residence, Danish language exam certificate, citizenship test results, financial records, employment history, and criminal record checks. Every field on the form has to line up with the supporting documents, because inconsistencies trigger delays or rejection.

The application fee is DKK 6,000, raised from DKK 4,000 in mid-2024. After you submit, confirmation arrives through e-Boks, Denmark’s secure government mailbox. The Ministry of Immigration and Integration may write during processing to ask for more information.

Parliamentary Approval and the Ceremony

Denmark’s Parliament (Folketinget) must individually approve every naturalization. The Naturalization Committee processes two bills per year, each containing the names of approved applicants.⁵ An older government benchmark put average processing at roughly 14 months, though many applicants report longer waits depending on case complexity and the timing of the next bill.⁶

Passing the bill isn’t the final step. You then have to attend a constitutional ceremony (grundlovsceremoni) hosted by your local municipality, where you sign a declaration committing to comply with the Danish constitution and to respect fundamental Danish values and legal principles. You aren’t officially a Danish citizen until the ceremony is completed. Children under 18 included in your application become citizens alongside you at the ceremony.³

If You Decide to Give Up US Citizenship

Because both countries allow dual nationality, renouncing your US citizenship is entirely optional. Some long-term residents do it anyway, usually because US citizens must file US tax returns regardless of where they live. It’s irreversible and financially serious, and you shouldn’t do it without professional tax and legal advice.

The process requires two in-person appointments at a US embassy or consulate, where a consular officer confirms your decision is voluntary and that you understand the consequences.⁷ The fee for processing a Certificate of Loss of Nationality dropped from $2,350 to $450 effective April 13, 2026.⁸

The bigger cost is tax. You must file all outstanding tax returns and reports for the five years before your renunciation date, plus Form 8854 (Initial and Annual Expatriation Statement) in the year you renounce.⁹ You become a “covered expatriate” subject to a mark-to-market exit tax on unrealized gains if any of three things is true: your net worth is $2 million or more on the date of expatriation, your average annual net income tax liability over the previous five years exceeds a threshold adjusted annually for inflation (approximately $206,000 based on the most recent published figure), or you fail to certify that you’ve met all tax obligations for the five preceding years.¹⁰ Covered expatriates are taxed as if their worldwide assets were sold the day before expatriation, with capital gains due on unrealized appreciation above an exclusion amount. For anyone with meaningful investments, retirement accounts, or property, the bill can be substantial.

Renouncing does not forfeit Social Security benefits you’ve already earned through payroll taxes. If you’ve accumulated the required 40 credits (roughly ten years of work), payments continue regardless of citizenship status, though the IRS typically withholds 30% of gross payments to non-resident aliens, and the US-Denmark tax treaty affects how those benefits are ultimately taxed.¹¹

1
Ministry of Immigration and Integration. Ministry of Immigration and Integration – Guidance on Nationality
2
U.S. Department of State. Dual Nationality
3
Borger.dk. Conditions for Foreign Citizens Acquisition of Danish Citizenship
4
Nordic cooperation. Danish Citizenship
5
The Danish Parliament. The Naturalization Committee
6
Borger.dk. Guidance on How to Apply for Danish Citizenship
7
U.S. Embassy & Consulates. Renouncing U.S. Citizenship
8
Federal Register. Schedule of Fees for Consular Services – Fee for Administrative Processing of Request for Certificate of Loss of Nationality of the United States
9
Internal Revenue Service. About Form 8854, Initial and Annual Expatriation Statement
10
Internal Revenue Service. Expatriation Tax
11
Internal Revenue Service. Tax Convention With Denmark