Why Shifting Money Offshore Doesn’t Spare Americans From Taxes

Affluent families around the world often move assets across borders in search of lower taxes, but Americans who do the same quickly run into a long-standing U.S. rule: Washington can tax the income they earn, no matter where the money is held. Ignoring the reporting rules can also turn a manageable tax bill into a much larger one.

According to CNBC, wealthy Chinese families are placing more money in American banks after Beijing introduced retroactive taxes on offshore wealth in July. One reason is that the United States is not part of the Common Reporting Standard, the system through which more than 100 jurisdictions automatically exchange account information.

For Americans, however, moving money in the opposite direction does not avoid U.S. tax. Opening an account in Switzerland, the Cayman Islands, or Singapore changes only where the funds are held. The United States still taxes the income, and failing to disclose the account can significantly increase the cost.

Section 61 Taxes Income “From Whatever Source Derived”

The federal rule comes from a single line in the Internal Revenue Code. Section 61 defines gross income as “all income from whatever source derived,” and specifically names interest, dividends, and capital gains. The Supreme Court affirmed the taxation of citizens on worldwide income in Cook v. Tait, a 1924 decision that remains binding more than a century later.

The IRS explains the same principle in Publication 17. A U.S. citizen with foreign interest income must report it “whether you reside inside or outside the United States and whether or not you receive a Form 1099 from the foreign payer.” Publication 525 applies the same treatment to dividends, capital gains, pensions, rents, and royalties.

A $400,000 Offshore Account Still Owes $3,520 a Year

Consider a married couple, both 66, filing jointly with tax-year 2026 income. Their pensions, IRA withdrawals, and the taxable portion of Social Security total $150,000 in taxable income. They then place $400,000 in a European bank account earning 4%.

That account produces $16,000 in interest. Added to their other income, taxable income rises to $166,000. For 2026, joint filers pay 22% on income above $100,800, while the 24% bracket does not begin until $211,400. As a result, the offshore interest is taxed at 22%.

The same deposit would generate the same federal tax at a bank in Ohio, and state income tax could also apply depending on where the couple lives.

Skipping the Paperwork Turns $3,520 Into $14,928

Foreign accounts also trigger reporting duties that domestic accounts do not. Joint filers living in the U.S. must attach Form 8938 to their return once foreign financial assets exceed $100,000 on the final day of the year or $150,000 at any point during the year. For single filers, the thresholds are $50,000 and $75,000. The form is required even if the assets do not change the tax due. Separately, the Treasury’s FBAR, or FinCEN Form 114, is required when foreign accounts together exceed $10,000.

If the couple fails to report anything, the one-year bill looks like this:

• Unpaid tax: $3,520
• Accuracy penalty: Section 6662(j) increases the usual 20% penalty to 40% when an undisclosed foreign asset causes the underpayment. That adds $1,408.
• Missing Form 8938: Section 6038D imposes a flat $10,000 penalty, plus another $10,000 for every 30 days the form remains unfiled after an IRS notice, up to $50,000 more.

That totals $14,928 before interest and before any FBAR penalty. The IRS also gets extra time to assess the tax. If the unreported income tied to a reportable foreign asset exceeds $5,000, the agency has six years to act instead of the usual three.

Living Abroad Shields Paychecks While Portfolio Income Stays Taxable

Relocating abroad can help more than moving money, but only with wages. The foreign earned income exclusion shields up to $132,900 of earned income for qualifying expats in tax year 2026. Interest, dividends, pensions, and IRA withdrawals remain fully taxable. Expat couples also benefit from a higher Form 8938 threshold of $400,000 at year-end, though they must still file once they cross it.

Three Legal Ways to Keep Money Overseas Without a Tax Surprise

1. Use the foreign tax credit or foreign earned income exclusion if eligible. If another country withholds tax from your interest or dividends, Section 901 generally allows that tax to be credited against your U.S. liability, usually on Form 1116. That prevents the same income from being taxed twice. For income earned outside the U.S., the foreign earned income exclusion or a tax treaty may also reduce double taxation.
2. File both forms every year. Form 8938 is filed with your 1040, while the FBAR is filed separately with FinCEN. If you missed prior years, IRS compliance programs may allow you to correct the problem before an audit does it for you.
3. Avoid foreign mutual funds. A fund based outside the United States often counts as a passive foreign investment company. Under Section 1291, gains may be taxed at the top 37% rate plus an interest charge. U.S.-listed international funds are generally reported on a 1099 and receive normal capital gains treatment.

For Americans, the biggest tax advantages are usually found in the U.S. tax code itself: Roth conversions, the 0% capital gains bracket, the step-up in basis at death, and living in a state with no income tax. Before moving money overseas, it is wise to review the numbers with a CPA who handles international returns.