Fillable Form W-8ECI – Claim Effectively Connected Income

The IRS Form W-8ECI (Certificate of Foreign Person’s Claim That Income Is Effectively Connected With the Conduct of a Trade or Business in the United States) is required when a foreign individual or entity receives income that is effectively connected (ECI) with a U.S. trade or business. Using a fillable PDF saves time, reduces errors, and lets you submit the form electronically.

What Is Form W-8ECI?

Form W-8ECI certifies that the income you receive is ECI and therefore subject to regular U.S. income tax withholding rather than the 30% flat rate applied to non‑effectively connected payments. The form also provides the IRS with your taxpayer identification number (TIN) and details about the trade or business activities.

When and Who Must Use Form W-8ECI

• Foreign individuals, corporations, partnerships, or trusts earning ECI from U.S. sources.
• Payments such as rents, royalties, interest, or services that are connected to a U.S. trade or business.
• When you are not eligible to claim a chapter 3 or 4 exemption on Form W-8EXP.

Step‑by‑Step Guide to Completing the Fillable PDF

Follow the simple steps below to fill out the form directly on our page without downloading any software.

Common Mistakes to Avoid

• Leaving the U.S. TIN blank or entering an incorrect number.
• Using the wrong version of the form (always choose the latest revision).
• Failing to sign and date the form – an unsigned form is invalid.
• Confusing “effectively connected income” with “portfolio interest” – the latter uses a different form.

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