FDAP Income Explained

FDAP income sits at the center of how the United States taxes foreigners, and it is one of the most misunderstood pieces of the tax picture for non-residents who own a Wyoming LLC. The acronym stands for Fixed, Determinable, Annual, or Periodical income, and it describes a specific category of US-source income that the Internal Revenue Code treats very differently from the operating revenue most online businesses actually earn. Understanding the distinction matters because FDAP is taxed on the gross amount at a flat default rate of 30 percent, collected through withholding at the source, while the business income that runs through most non-resident LLCs is taxed on a completely different basis or, very often, not taxed by the US at all. This guide walks through exactly what FDAP is, how the withholding machinery works, where a Wyoming LLC owner is likely to encounter it, and how treaties and the right paperwork change the outcome.

What "Fixed, Determinable, Annual, or Periodical" actually means

The four words in the acronym are not casual labels. Each one carries technical weight that defines whether a payment falls inside the category. Income is "fixed" when it is paid in amounts known ahead of time, and "determinable" when there is a basis for figuring the amount even if the exact figure is not fixed in advance. The "annual or periodical" requirement is the broadest of the four: income qualifies even if it is paid only once, and even if the payments are irregular or made at uneven intervals. Courts and the IRS have read "periodical" expansively, so a single lump-sum royalty or a one-time licensing payment can be FDAP just as easily as a recurring quarterly dividend.

What unites all FDAP income is that it is generally passive in nature and US-source. It is the return on capital, property, or rights rather than the proceeds of an active trade or business. Dividends are the textbook case: you own shares, you receive a payment, you did no work to earn that specific payment. Royalties, interest, and rent follow the same logic. The income arises because you hold an asset that produces a yield, not because you sold a product or performed a service in the ordinary course of running a company.

Two qualifiers narrow the category in ways that surprise people. First, FDAP must be US-source. Income with a foreign source, even if it would otherwise look passive, is outside the US net for a non-resident. Second, FDAP is the residual category for income that is not effectively connected with a US trade or business. The Code essentially divides a non-resident's US-source income into two buckets, and FDAP is the passive bucket that gets the flat 30 percent treatment. The other bucket, effectively connected income, is taxed on a net basis at graduated rates and is covered separately.

FDAP versus ECI: the distinction that governs everything

For a non-resident, US-source income lives in one of two taxing regimes, and figuring out which one applies is the single most important step. FDAP income is taxed under sections 871(a) and 881 at a flat 30 percent on the gross amount, with no deductions allowed, and the tax is normally collected by withholding before the money ever reaches you. Effectively connected income, or ECI, is taxed under sections 871(b) and 882 at the same graduated rates that apply to US persons, but on a net basis after deductions, and it is reported and paid on a return rather than withheld at a flat rate.

The practical consequences of which bucket applies are enormous. Because FDAP is taxed on gross with no deductions, a 30 percent rate on a payment can translate into an effective rate far higher than 30 percent of your actual economic profit on that activity. ECI, by contrast, lets you subtract the costs of earning the income and apply a graduated schedule, so the effective rate on real profit is often much lower, and for many non-resident operating businesses the US tax on ECI works out to zero because the income is not effectively connected at all.

The reason this matters for Wyoming LLC owners is that their core revenue almost never falls into the FDAP bucket. A foreign-owned single-member Wyoming LLC selling software, consulting, digital products, or physical goods to customers, with the work performed outside the United States, is earning operating business income, not passive yield on US assets. That revenue is not FDAP. Whether it is taxable ECI is a separate question that usually turns on whether the owner has a US trade or business and a US presence, and for genuinely remote operations the answer is frequently that there is no US tax. FDAP enters the picture only at the margins, typically when the business or its owner also happens to hold a US investment that throws off dividends, interest, or royalties.

Common types of FDAP income and what is excluded

It helps to see the categories side by side. The table below contrasts the kinds of payments that typically are FDAP with the kinds that typically are not, for a non-resident receiving them.

Dividends are the cleanest example of FDAP. If your LLC, or you personally, hold shares in a US corporation and receive a distribution of profits, that dividend is US-source FDAP. Royalties are similarly clear when the intellectual property is used in the United States: a non-resident author whose book sells through a US publisher, a musician licensing a catalog to a US streaming service, or an inventor licensing a patent to a US manufacturer is receiving US-source royalty FDAP.

The exclusions are just as important to internalize. The sale of goods is not FDAP, full stop. Service income for work performed outside the United States is foreign-source and therefore outside FDAP for a non-resident. Capital gains on US securities sit in a special zone: a non-resident who is not present in the US for the requisite number of days generally is not taxed by the US on gains from selling US stocks, and these gains are not treated as FDAP subject to the 30 percent withholding either, though gains on US real-property interests are a major exception under the FIRPTA rules. Bank-deposit interest and portfolio interest paid to non-residents are frequently exempt outright, which is why a Wise, Mercury, or Relay balance earning a little interest usually does not generate a 30 percent withholding hit.

How the 30 percent withholding actually works

FDAP tax is a withholding tax, which means the US payer, not you, is responsible for collecting it and sending it to the IRS. This is a fundamentally different mechanism from filing a return and paying what you owe. The withholding agent must determine the character of the payment, apply the correct rate, hold back that amount, and remit it. The default rate is 30 percent of the gross payment, and the agent is personally liable to the IRS if it under-withholds, which is why payers tend to be cautious and will withhold the full 30 percent in the absence of valid documentation.

The sequence runs like this. First, the US payer determines that the income is US-source FDAP. Second, in the absence of any treaty documentation, the payer withholds 30 percent and pays you the remaining 70 percent. Third, if you have furnished a valid Form W-8BEN-E (for an entity such as your LLC) or Form W-8BEN (for you as an individual) claiming a treaty benefit, the payer applies the lower treaty rate instead and remits the larger balance to you. Fourth, after year end, the payer files Form 1042 as its annual withholding return and issues you a Form 1042-S showing the gross income paid and the tax withheld. The 1042-S is your evidence of both the income and the tax, and you keep it the way a US worker keeps a W-2.

The flat, gross nature of this tax is what makes the documentation so valuable. There are no deductions to soften the blow and no graduated brackets to ease the lower end. Thirty percent comes off the top of every dollar of genuine FDAP unless a treaty reduces the rate. That is why getting a correct W-8 on file before the first payment is worth real money: a treaty that drops a dividend rate from 30 percent to 15 percent, or a royalty rate to 0, changes the economics of the income stream immediately and without the friction of chasing a refund later.

The role of Form W-8BEN-E and treaty claims

Form W-8BEN-E is the certificate a foreign entity gives to a US withholding agent to establish that it is foreign and, where applicable, to claim a reduced rate under an income tax treaty. For a foreign-owned Wyoming LLC, the form identifies the entity, certifies its foreign status for chapter 3 and chapter 4 (FATCA) purposes, and in Part III makes the treaty claim that lowers withholding. An individual non-resident receiving FDAP in their own name uses the shorter Form W-8BEN instead.

The treaty claim is the operative part. In Part III of the W-8BEN-E you state the country of residence under the treaty, the specific article and paragraph that grants the reduced rate, the type of income, and the rate claimed. The form must be accurate and current; a stale or incorrect form leaves the payer no choice but to fall back to 30 percent. One critical point that trips people up: a treaty claim is only valid if a treaty between the United States and the relevant country is actually in force, and only at the rate that treaty specifies for that category of income. You cannot improvise a rate, and you should never assume a rate without confirming the current treaty article. If your country has no income tax treaty with the US, Part III of the form stays blank, you make no treaty claim, and the full 30 percent applies to genuine FDAP.

There is also a knock-on effect of the disregarded-entity structure that many single-member Wyoming LLC owners overlook. Because a foreign-owned single-member LLC is disregarded for US federal tax purposes by default, the IRS looks through it to the owner for treaty eligibility. The treaty benefit is generally claimed based on the owner's residence and treaty status, and the W-8 documentation has to reflect that look-through correctly. This is a common area to get a CPA's eyes on, because filling the form out as if the LLC itself were the treaty resident, rather than the individual owner, can invalidate the claim.

A worked example with numbers

Picture a Wyoming LLC owned by a single individual who is a tax resident of the United Kingdom. In a given year the LLC takes in two very different streams of money. The first is $60,000 from monthly SaaS subscriptions paid by customers worldwide, where all the development and support work happens in the UK. The second is a $2,000 dividend from a US-listed company whose shares the LLC bought through a US brokerage.

The $60,000 of SaaS revenue is operating business income for services and software delivered from outside the United States. It is not FDAP. There is no 30 percent withholding on it, and whether any of it is US-taxable turns on the separate ECI analysis, which for a genuinely remote operation with no US office, employees, or dependent agents will typically conclude that there is no US trade or business and therefore no US income tax. The dividend is a different animal entirely. It is classic US-source FDAP. At the default rate, the brokerage would withhold 30 percent, or $600, and pay the LLC $1,400. With a valid W-8BEN-E on file claiming the UK treaty's portfolio-dividend rate, the withholding drops to the treaty rate, commonly 15 percent for portfolio dividends, so the withholding becomes $300 and the LLC receives $1,700. Confirm the exact article and rate before relying on it, because treaty rates vary by the type and size of the holding.

The lesson from the numbers is the lesson of the whole topic. A business can have substantial revenue and almost no FDAP. The FDAP slice here is $2,000 out of $62,000 in total receipts, and the tax on it, even at the default rate, is $600. The FDAP regime governs the passive tail of the income, not the operating core, and for most non-resident Wyoming LLC owners that tail is small or nonexistent.

Edge cases worth understanding

US real-estate rent is the most important edge case because it has its own election. By default, rent paid to a non-resident for US real property is FDAP, taxed at 30 percent on the gross rent with no deduction for mortgage interest, property taxes, depreciation, or management costs, which is a punishing result for a leveraged property. The section 871(d) net election changes the regime: by making the election on a Form 1040-NR, the non-resident treats the rental activity as a US trade or business, which moves it into the ECI regime and allows deductions so that tax is paid on net rental profit at graduated rates. For most rental investors the net election is dramatically better, but it requires filing a US return.

Mixed payments are another trap. A single platform payout or a single contract can bundle non-FDAP service income with a small FDAP component, and the payer is supposed to characterize each piece separately. You should not assume an entire payout is FDAP just because one slice of it is, nor assume none of it is FDAP just because most of it is service income. Capital gains deserve a second mention as well: gains on US securities held by a non-resident who is not otherwise engaged in a US trade or business are generally not US-taxed and are not FDAP, but gains on US real-property interests are pulled into US tax under FIRPTA with its own withholding rules, so real estate is the standing exception to the friendly capital-gains treatment.

Common mistakes non-residents make with FDAP

The most frequent error is assuming that ordinary business revenue, especially Stripe or PayPal payouts, is FDAP subject to 30 percent withholding. It usually is not. Payment processors move operating revenue for goods and services, and for a non-resident performing the work abroad that revenue is not US-source FDAP. The processor's role in withholding is narrow and triggered only by genuine FDAP characteristics, not by the mere fact that money flowed through a US platform.

A second mistake is failing to put a valid W-8 on file before payment and then trying to fix the over-withholding later. Recovering over-withheld FDAP is possible by filing a Form 1040-NR (or the entity equivalent) to claim the excess as a refund, but it is slow, it ties up your cash for many months, and it adds a filing obligation you could have avoided. Getting the W-8BEN-E or W-8BEN correct and current before the first dividend, royalty, or rent payment is far cheaper than chasing the IRS afterward.

The remaining recurring errors cluster around treaties and documentation:

• Claiming a treaty rate when no treaty is actually in force, which invalidates the claim and exposes the payer.
• Inventing or guessing a rate instead of citing the specific treaty article that governs the income type.
• Treating the LLC itself as the treaty resident on a single-member disregarded entity instead of looking through to the owner.
• Letting a W-8 go stale; the forms have validity periods and must be refreshed when circumstances change.
• Confusing FDAP gross taxation with ECI net taxation and either over-paying on income that should be netted, or under-reporting income that genuinely needed a return.

When any of these questions are close, confirm the treaty status and the correct form treatment with a CPA who handles non-resident filings, because the cost of getting the documentation wrong is paid in cash withheld at 30 percent.

If your business income is operating revenue rather than passive US yield, a properly formed Wyoming LLC keeps the structure clean and the FDAP exposure minimal. We form your Wyoming LLC for $397 all-inclusive, with the LLC typically filed within about 24 hours, registered agent included, and an EIN obtained even without an SSN, so you have the entity and tax ID in place before you ever need to hand a payer a W-8BEN-E.