What is lagerbeskatning and how does it affect Americans in Denmark?
Short answer: Lagerbeskatning is Denmark's mark-to-market tax principle: most investment funds and the Danish aktiesparekonto are taxed annually on the change in value over the year, whether or not anything was sold. For a US citizen this generally stacks on top of — rather than replaces — PFIC exposure on the same non-US fund, producing two separate layers of annual tax on unrealised gains.
Written and reviewed by Anthony Walsh, Selanis. Last reviewed 2026-10-09.
Why it works this way
Denmark taxes different asset classes under different principles. Most Danish and foreign investment funds fall under lagerbeskatning (the inventory, or mark-to-market, principle): the value at the start and end of the tax year is compared and the difference is taxed as income for that year, regardless of whether a single unit was sold. Directly held shares in ordinary companies are generally taxed on realisation instead, which is the exception rather than the rule for fund holdings.
For an American, the US tax system does the opposite by default — it taxes on realisation. So a fund that produces a Danish lagerbeskatning charge in a year you did not sell anything creates a Danish tax bill with no matching US event to credit it against that year. The timing mismatch is structural and recurs every year the fund is held.
Layered on top, non-US-domiciled funds are almost always Passive Foreign Investment Companies (PFICs) under US law. That means Form 8621 reporting and, absent a timely qualified electing fund or mark-to-market election on the US side, the punitive default PFIC regime can apply as well. A Dane's ordinary, well-understood fund can be taxed under two separate mark-to-market-style regimes that do not talk to each other.
The practical fix is usually to hold non-US funds outside Denmark less and US-domiciled funds more, and, where a Danish wrapper is unavoidable, to make the matching US elections on time — a PFIC election missed in year one is difficult or impossible to fix later.
The expensive mistake: Assuming Danish tax paid on a fund settles the US side
Because lagerbeskatning already taxes the fund annually in Denmark, many assume the US position is automatically covered by a foreign tax credit. It generally is not, because the PFIC computation and the Danish computation use different bases, different years in some cases, and different definitions of gain. The two have to be reconciled deliberately, not assumed to cancel out.
What to do
- Identify every fund-type holding subject to lagerbeskatning — Aktiesparekonto, most investeringsforeninger and many ETFs fall here. Directly held single-company shares usually do not.
- Make any available US PFIC election in the first year of ownership — A qualified electing fund or mark-to-market election generally cannot be made retroactively once the default regime has applied.
- Model the Danish and US tax together before buying, not after — The right answer is usually US-domiciled funds held outside the Danish wrapper wherever the structure allows it.