Before You Leave the US for the Netherlands: The 30% Ruling Doesn't Do What You Think It Does

The 30% ruling reduces your Dutch income tax. It does not reduce your US income tax. On some income bands, the ruling makes your Dutch bill smaller and your US bill larger. This is the thing your employer's relocation package didn't explain.

Sarah moved from New York to Amsterdam for a role at a Dutch tech scale-up. Her employer applied the 30% ruling — she'd receive 30% of her gross salary as a tax-free expense reimbursement. She ran the numbers and was excited: Dutch income tax would be significantly lower. Then her US CPA explained the mechanism. The 30% ruling reduces Dutch income tax. The US still taxes her on 100% of her income. The Dutch income tax credit she could apply against her US liability was now smaller — because she paid less Dutch tax. On some income bands, a lower Dutch tax credit means the US takes more, not less.

She hadn't modeled this. She hadn't known to.

Before You Leave the US

Model the 30% ruling's US tax impact

The 30% ruling allows qualifying employees to receive 30% of their gross salary as a tax-free reimbursement for "extraterritorial costs." This reduces your Dutch taxable income by 30%, which reduces your Dutch income tax. The Dutch income tax you save is also the Dutch foreign tax credit you lose on your US return.

For US citizens and green card holders: your US tax liability is calculated on 100% of your income regardless. You offset that US liability with Dutch income tax actually paid via the Foreign Tax Credit (Form 1116). If the ruling reduces your Dutch tax, you have fewer credits to apply.

The net effect depends on your income level and the relative Dutch vs. US marginal rates. At high income levels where Dutch rates exceed US rates, you typically have excess Dutch credits — the 30% ruling helps you (you're paying less Dutch tax, and you'd have had excess credits anyway). At moderate income levels where Dutch and US rates are closer, the ruling can create a situation where Dutch credits no longer fully cover US liability. Your US tax bill goes up.

Ask your employer's relocation consultant or your US CPA to model this for your specific income level before you accept. The ruling is almost always net-beneficial overall — but the US tax impact is the piece most relocation packages don't include in the calculation.

30% ruling eligibility: apply within 4 months, no exceptions

The 30% ruling must be applied for within 4 months of the start date of your Dutch employment. Your employer submits the application to the Dutch Tax Authority (Belastingdienst). If the application is late, the ruling cannot be applied retroactively. The 4-month window is absolute — there are no extensions for illness, relocation delays, or administrative oversight.

This is a permanent miss if it slips. Make sure your employer's HR or mobility team has the application process on their calendar as a priority from day one.

401K: keep it, model the distribution plan

Leave your 401K in the US. There is no US-Netherlands treaty provision equivalent to the US-Canada RRSP mechanism that creates a clean deferral of 401K earnings in the Netherlands. The Netherlands taxes distributions as ordinary income, offset by US withholding credits.

The 30% ruling affects this calculation too: if your 401K distributions are part of your total Dutch income, the ruling may or may not apply depending on whether distributions are considered "extraterritorial costs" — generally they're not. Your Dutch tax advisor needs to guide the distribution timing.

First 90 Days in the Netherlands

Municipal registration (inschrijving bij de gemeente)

Register at your local gemeente (municipality) within 5 days of establishing your Dutch address. This triggers Dutch tax residency and starts the 4-month clock on the 30% ruling application. Your BSN (burger service nummer, the Dutch equivalent of a Social Security number) is issued at registration — you need it for banking, healthcare, and tax purposes.

Box 3: the deemed return tax on assets

The Netherlands applies a Box 3 tax on savings and investments. Instead of taxing actual capital gains, the Dutch system applies a deemed return — the assumption is that your assets earned a specific percentage return, and that deemed return is taxed at 36% (2024 rate). The deemed return percentage has varied by asset class; for 2024, the average combined deemed return is approximately 2.87%, resulting in an effective Box 3 rate of approximately 1.03% of net assets annually.

Box 3 applies to Dutch savings accounts, Dutch brokerage accounts, and foreign assets — including your US brokerage account and 401K balance if you don't elect the partial non-resident status described below.

Partial non-resident election: the 30% ruling's asset protection

30% ruling holders can elect to be treated as partial non-residents of the Netherlands for Box 3 purposes. This means foreign assets — your US brokerage account, your 401K, any non-Dutch financial assets — are excluded from the Box 3 deemed return calculation. Only Dutch savings and investment accounts are included.

This election must be made annually on your Dutch tax return. It is one of the most important tax elections available to 30% ruling holders and significantly reduces the Box 3 burden for people with substantial US-held assets. Confirm with your Dutch tax advisor that this election is being made.

Ongoing Obligations

Dutch income tax return (aangifte): Annual, by May 1 (extension available). Reports worldwide income as a Dutch resident. Box 1 (employment income), Box 2 (substantial shareholdings), Box 3 (savings and investments).

US Form 1040: Annual, as a US citizen or green card holder. Dutch income tax paid is creditable against US liability on Dutch-source income via Form 1116.

FBAR (FinCEN 114): Annual, for Dutch bank accounts, investment accounts, and pension accounts exceeding the $10,000 aggregate threshold. The Netherlands participates in FATCA, so Dutch financial institutions report account information to the Belastingdienst, which shares with the IRS.

Dutch dividend withholding tax: The Netherlands withholds 15% on dividends from Dutch-source companies. This is a creditable foreign tax — apply it against your US liability on those dividends via Form 1116. Dutch withholding on Dutch stocks is one of the few Dutch taxes that directly reduces your US bill dollar-for-dollar.

30% ruling renewal: Not automatic. Your employer confirms annually with the Belastingdienst that the ruling conditions are still met. If your employer changes or your role changes materially, the ruling may need to be re-evaluated.