The US-Denmark Double Taxation Agreement (DTA): What Every Expat Needs to Know

You’re going to be taxed twice. Sort of.

That’s the fear that lands in every American expat’s inbox about six weeks after they arrive in Denmark. You’re earning a salary in Copenhagen, paying Danish income tax at somewhere north of 40% effective, and you just remembered the IRS still wants a return. Are you about to write two very large cheques for the same money?

The short answer is: almost certainly not, assuming you file correctly. The US-Denmark tax treaty exists precisely to prevent that outcome. But the mechanism matters, because the treaty doesn’t protect you automatically. You have to claim it correctly, and the rules look quite different depending on whether you’re an employee or running your own business.

This article walks through the parts of the treaty that actually affect day-to-day life for high-income employees and freelancers. It’s not a line-by-line treaty summary (those exist, and they’re very dull). It’s an explanation of the rules that move the needle.

What a tax treaty actually does

A tax treaty is an agreement between two governments that sets out which one gets taxing rights over specific types of income, and under what conditions. The US and Denmark have had one in place since 1948, with a substantially updated version signed in 1999 and in force since 2000.

The treaty handles this by assigning “primary” taxing rights. For most income, Denmark gets to tax first because you’re a Danish resident. The US can then tax the same income, but it must give you credit for what Denmark already took. If your Danish tax rate is higher than your US marginal rate on that income (which for most Americans in Denmark, it is), the credit wipes out the US liability entirely. The treaty is what makes that credit framework work cleanly.

The saving clause: why the US still taxes you

Before getting into the specific articles, this needs to be said plainly. The US-Denmark treaty contains a saving clause (Article 1, paragraph 4) that reserves the US’s right to tax its own citizens and residents as if the treaty didn’t exist, for most purposes.

That’s not an oversight. It’s deliberate. The US taxes on citizenship, not residency. Moving to Denmark doesn’t change your filing obligation. The treaty is there to prevent double taxation, but it doesn’t override citizenship-based taxation.

The saving clause has exceptions, though, and they matter.

The pension articles (Article 18) are preserved, meaning the treaty’s treatment of Danish pension income is explicitly carved out from the saving clause. So Danish pension distributions can receive treaty-protected treatment even for US citizens.

Article 17 (artists and athletes) and a handful of other specific provisions are also exempt from the saving clause, but they’re unlikely to apply to a software engineer or freelance consultant.

The practical upshot: for employment and self-employment income, the saving clause means you’re filing a US return and claiming a Foreign Tax Credit to offset what Denmark already collected. You’re not relying on the treaty to excuse the income from US tax. You’re relying on it to avoid paying twice.

Residency tie-breakers: if both countries want to claim you

Article 4 sets out the tie-breaker rules for tax residency, which become relevant if both the US and Denmark would otherwise consider you a tax resident.

The tie-breaker works down a hierarchy. First: where do you have a permanent home available to you? If both countries (your Copenhagen flat and a house you still own in the US), it moves to the next test: where is your centre of vital interests (family, social, and economic ties)? If still tied, it falls to habitual abode, then nationality.

For most Americans who’ve genuinely relocated to Denmark, this resolves cleanly. You’re a Danish tax resident. You remain a US citizen with a filing obligation, but Denmark has primary taxing rights on your income.

Where it gets complicated: if you’re in Denmark on a temporary assignment and maintaining a meaningful life in the US simultaneously, the tie-breaker analysis matters. That’s a facts-and-circumstances call, and the consequences of getting it wrong are meaningful. Talk to a cross-border specialist before taking a position on residency.

Employment income: Article 15

For a salaried employee, Article 15 is the most important article in the treaty.

The basic rule: employment income is taxed in the country where the work is performed. If you’re a software engineer employed by a Danish company and you work in Copenhagen, Denmark taxes that income. Full stop.

The US then taxes the same income under the saving clause, but you claim a Foreign Tax Credit for the Danish tax paid. Denmark’s combined effective rate (AM-bidrag at 8%, plus income tax) typically exceeds the US federal rate for most income levels, which means the credit tends to eliminate the US liability on employment income.

Article 15 also contains a short-stay exception: if you’re in Denmark for 183 days or fewer in a 12-month period, your employer is not a Danish resident, and your salary isn’t borne by a Danish permanent establishment, then Denmark doesn’t get to tax it. This is primarily relevant to Americans sent to Denmark on short-term assignments by a US employer. It almost never applies to people who’ve actually moved here.

One specific scenario worth flagging: if you work remotely for a US employer from Denmark, the treaty doesn’t automatically shelter that income from Danish tax. Denmark will generally tax income earned by a Danish resident regardless of where the employer is based. If you’re living in Copenhagen and billing 40 hours a week for an American company, plan to pay Danish tax and claim a credit on your US return.

Self-employment and freelancers: Articles 7 and 14

The treaty handles self-employment income differently from employment income, and the distinction matters a lot if you’re a freelance consultant, contractor, or running a one-person operation.

Article 14 (independent personal services) was the historical article for solo professionals. Under the 1999 treaty, this was effectively merged with the business profits framework in Article 7, which governs the profits of enterprises. For practical purposes, Denmark taxes the business income of a Danish resident self-employed person, and the US credits the Danish tax paid.

Here’s the concrete version. Say you’re a freelance UX consultant in Copenhagen, invoicing US clients in dollars. You’re a Danish tax resident. Denmark will tax that income as personal business income. Your US return will show the same income, and you’ll claim a Foreign Tax Credit for the Danish taxes paid.

The wrinkle: the Foreign Earned Income Exclusion (FEIE) and the Foreign Tax Credit (FTC) interact awkwardly with self-employment income, and picking the wrong one costs real money.

FEIE vs FTC: which one actually works for you

This deserves its own section because the choice is consequential and the defaults are often wrong.

The Foreign Earned Income Exclusion lets you exclude up to USD 132,900 of foreign earned income from US tax, assuming you meet the bona fide residence or physical presence test. It sounds appealing. For most Americans in Denmark, it’s a trap.

The problem: the FEIE only excludes income from US federal income tax. It doesn’t reduce your self-employment tax (the 15.3% on net self-employment income up to the Social Security wage base of USD 184,500). And once you exclude income under the FEIE, you can’t claim a Foreign Tax Credit on that same excluded income. If Denmark has already taxed it at 40%+, you’ve given up a credit that would have wiped out your US liability entirely.

The Foreign Tax Credit is almost always better for Americans earning income in Denmark, because Danish tax rates are high enough that the credit eliminates most or all of the US tax bill on the same income. You’re not reducing your taxable income; you’re offsetting the US tax with Danish tax already paid.

The exception is if your Danish tax liability is for some reason very low (maybe you’re in the country on a short-term assignment with a tax equalisation arrangement, or you’re earning below Danish tax thresholds). In those cases, running the numbers on both approaches makes sense.

Dividends and interest: Articles 10 and 11

If you hold Danish investments or have Danish bank accounts, Articles 10 and 11 cover how dividends and interest are taxed.

The treaty caps Danish withholding tax on dividends paid to US residents at 15% for most dividends, and 5% for dividends paid to a company owning at least 10% of the Danish payer. For individuals, 15% is the relevant number.

Denmark’s domestic dividend tax rate (aktieindkomst) is 27% up to DKK 79,400, and 42% above that. For a Danish resident earning dividends, the treaty withholding cap of 15% is largely academic — Denmark will apply its own rates under domestic rules, which you then credit on the US side.

Interest income is similar: treaty withholding is capped, Denmark taxes it as capital income, and you credit Danish tax against US liability.

One note on US brokerage accounts and FBAR/FATCA implications: if you’re holding Danish securities in a foreign account, that’s a reporting trigger regardless of treaty treatment. We cover that in detail in the FBAR vs FATCA guide.

Pensions: Article 18 and why it matters

Article 18 is the pension article, and it’s one of the few places where the saving clause exception creates a genuinely useful outcome for Americans.

The treaty’s pension article protects distributions from Danish pension schemes. Specifically, contributions by a Danish employer to a pension on your behalf can be excluded from US taxation during the accrual phase, and distributions are taxed only in Denmark once you start drawing down.

In practice, this means your employer’s pension contributions — typically somewhere between 8% and 17% of salary depending on your contract and sector — don’t create an immediate US tax hit the way they might without the treaty. That’s a meaningful benefit that compounds quietly over a full Danish career.

The PAL tax (pensionsafkastskat) on Danish pension returns is set at 15.30%. The treaty doesn’t eliminate this, but it does give US residents a cleaner framework for how pension income is eventually reported.

If you have a 401(k) or IRA from your US years, the treaty’s pension protections work the other way too: US pension distributions are generally taxed only in the US, not in Denmark, for Danish residents.

Early withdrawal from a Danish pension scheme carries a penalty of 60% under Danish rules — the treaty doesn’t soften that.

What employees and freelancers should actually take away

The treaty is complex enough that a line-by-line summary is more likely to confuse than clarify. But if you’re a US citizen working in Denmark, these are the four things that matter most.

First: you’re still filing a US return. The saving clause guarantees it. Budget for it, find a cross-border accountant, and don’t assume moving to Denmark fixed the IRS problem.

Second: for employment income, the Foreign Tax Credit is usually the right tool. Denmark taxes your salary first, the US taxes it second, the credit eliminates the overlap. The treaty makes this clean.

Third: for self-employment income, the FEIE is usually the wrong choice, even though it looks attractive. The self-employment tax issue alone tends to tip the math toward the FTC.

Fourth: the pension articles are genuinely valuable, but getting the treatment right requires coordination between your Danish pension administrator and your US tax preparer. The default filing by someone who doesn’t know the treaty will miss the carve-out.

If you’re newly arrived in Denmark and you haven’t yet worked with a cross-border tax professional, your first Danish tax year is the time to do it. Treaty elections made in year one can affect every subsequent year. A preparer who knows both systems typically pays for themselves in year one alone.