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Form 5472 for Foreign-Owned US LLCs: The $25,000 Penalty Trap That Catches Single-Member Disregarded Entities Off Guard

Foreign owners of US single-member LLCs must file Form 5472 by April 15, 2026, even with zero revenue. A capital contribution as small as $1 triggers the requirement, and a missed filing carries a $25,000 minimum penalty plus uncapped $25,000 continuation fees every 30 days after IRS notice.

Form 8606 and the Backdoor Roth: How One Missing Tax Form Causes Double Taxation

Form 8606 is the IRS's running ledger of after-tax basis inside traditional, SEP, and SIMPLE IRAs. Skip it and the IRS treats your basis as zero, taxing the same dollars a second time at distribution. This guide explains how the form works, why the pro-rata rule punishes most backdoor Roth conversions, and how to keep your basis documented for the next 30 years.