The Double Taxation Myth: Why Taxed Twice Isn't Always What You Think

The Double Taxation Myth: Why Taxed Twice Isn't Always What You Think Americans living abroad must still file U.S. taxes, but that doesn’t automatically mean paying tax twice. Double taxation treaties and foreign tax credits often prevent true double taxation. The real risk is misunderstanding how different assets are taxed across borders — which makes pre-move planning essential.

When Americans move abroad, one phrase causes instant anxiety:

"You'll be taxed twice."

It sounds simple.
It sounds terrifying.
And it's only partially true.

As expat financial advisor Jake Barber, SJB Global, explains:

"You're not just dealing with potentially taxes in the States — you're dealing with taxes in the country where you're going as well."

That's true. But filing taxes in two countries does not automatically mean paying taxes twice. Let's unpack why.

Yes, Americans Are Taxed Globally.

Unlike most countries, the U.S. taxes its citizens based on citizenship, not residency. That means even if you live in Spain, France, Panama, or elsewhere, you still file a U.S. tax return. That's where the "double taxation" fear begins.

But here's the nuance: filing is not the same as paying twice.

How Tax Treaties Actually Work

Many countries have double taxation treaties with the United States. These agreements are specifically designed to prevent the same income from being taxed twice.

Jake puts it simply:

"Understanding how those assets are taxed… every country is going to have different rules."

And those rules determine:

• Which country has primary taxing rights
• Whether credits apply
• How pensions are treated
• How capital gains are handled
• Whether estate taxes overlap

For example:

• In some countries, U.S. retirement accounts are taxed only in the U.S.
• In others, capital gains may be taxed where you reside.
• Estate taxation can differ dramatically depending on treaty structure.
• There is no universal rule. It depends on the treaty — and the type of asset.
• Income vs. Capital Gains: The Critical Distinction

One of the biggest mistakes expats make is assuming all income is treated the same. It isn't.

You might have:

• Earned income
• Dividend income
• Capital gains
• IRA withdrawals
• Roth distributions
• Pension income

Each of these can be taxed differently — by both the U.S. and your new country of residence. That's why structure matters more than assumptions.

Jake emphasizes this repeatedly in his work with cross-border clients:

"You need to understand how your different assets are taxed… because the tax rate could be different on a brokerage account, an IRA, a Roth, or whatever."

If you calculate your retirement plan on gross income instead of net-after-tax income, your projections may be completely off.

The Real Risk: Timing and Structure

The bigger danger isn't automatic double taxation. It's misaligned planning.

For example: Some U.S. financial institutions restrict accounts once you update your address to a foreign country.

Jake sees this often:

"Someone's updated their address, they've moved to Europe, and their 401(k) provider turns around and says, ‘You've got 90 days to move the money somewhere else.'"

That kind of forced timeline can create serious tax consequences if handled incorrectly.

And once you've moved, your options may narrow significantly. That's why Jake recommends planning at least three months before relocating. Because once you're already overseas, certain restructuring opportunities may no longer be available.

Americans and the "Always Taxed" Reality

There's one important truth that isn't a myth.

As Jake notes:

"Americans are always going to have the double taxation issues because the IRS are going to tax them regardless."

The U.S. tax obligation doesn't disappear. But that doesn't automatically mean double payment. Often, foreign tax credits offset U.S. liability. The key is structuring assets correctly so that you aren't unintentionally triggering avoidable taxes, withholding, or penalties.

The Bottom Line

The phrase "taxed twice" oversimplifies a complex system. Cross-border taxation isn't random — it's rule-based.

And those rules vary by:

• Country
• Asset type
• Income category
• Timing
• Residency status
• Treaty provisions

The real risk isn't double taxation.

It's not understanding how the system works before you move.

And in cross-border planning, timing matters almost as much as structure.

If you're considering a move abroad, understanding how your assets will be taxed — in both countries — is one of the most important financial decisions you'll make.

It's not about fear.

It's about planning.