What exactly is 'effectively connected income' under IRC 864(c)? How do I know if my LLC income qualifies?

This is a common point of confusion. 'U.S.-source income' (determined under IRC 861-865) means income that originates from U.S. sources based on sourcing rules. 'Effectively connected income' (determined under IRC 864(c)) means income that is connected to a U.S. trade or business.

They overlap significantly but are not the same. Some U.S.-source income is not ECI (for example, portfolio dividends received by a foreign investor who is not in a U.S. trade or business). And in limited cases, even foreign-source income can be ECI if it is effectively connected with a U.S. trade or business.

For U.S.-source income, IRC 864(c)(2) provides two tests to determine if income is effectively connected with a U.S. trade or business:

1. The Asset-Use Test: Is the income derived from assets used in, or held for use in, the conduct of the U.S. trade or business? For example, income from a bank account used in your business operations would be ECI.

2. The Business-Activities Test: Were the activities of the U.S. trade or business a material factor in the realization of the income? For example, if your U.S. business activities (marketing, customer service, order processing) materially contribute to generating the sales revenue, that revenue is ECI.

If either test is met, the income is ECI.

Under IRC 864(c)(4), certain categories of foreign-source income can also be treated as ECI if there is a U.S. office or fixed place of business that is a material factor in producing the income. The categories are limited to:

- Rents, royalties, or dividends from the active conduct of a trade or business - Gains from the sale of inventory - Gains from the sale of personal property through a U.S. office

This provision prevents foreign businesses from routing income through foreign entities to avoid ECI treatment when the income is really generated by U.S. activities.

For your Florida LLC selling digital products:

- If you are found to be engaged in a U.S. trade or business (the threshold question under IRC 864(b)), then all income generated by that business where the asset-use or business-activities test is met would be ECI. - If your LLC has U.S.-based infrastructure (servers, employees, offices) that materially contribute to sales, even international sales could be ECI. - If you operate entirely from Brazil with no U.S. presence beyond the LLC registration, you may not be in a U.S. trade or business at all, and there would be no ECI.

The ECI analysis only becomes relevant after the threshold question of whether a U.S. trade or business exists is answered affirmatively.

The practical impact is significant:

- ECI is taxed at graduated rates (10% to 37% for individuals, 21% for corporations) on a net basis after deductions under IRC 871(b) or 882. - Non-ECI U.S.-source FDAP income is taxed at 30% on the gross amount under IRC 871(a) or 881. - Income that is neither ECI nor U.S.-source FDAP is generally not subject to U.S. tax at all.

For an active business like yours, ECI treatment (with deductions) is usually more favorable than FDAP treatment. The worst-case scenario is income that the IRS characterizes as FDAP — where you cannot deduct expenses but still owe 30% on gross receipts.