Best Form 5472 Filing Services in September 2026 (Honest Comparison)

Historical provider market snapshot

The best Form 5472 filing service in September 2026 depends on what you need. For a standard foreign-owned single-member U.S. LLC, two dedicated services to compare are Form5472.online and Form5472.ai. Form5472.online published a $399 CPA-prepared service. Form5472.ai published a $299 team-prepared, CPA-reviewed service. Both providers stated that the applicable Form 5472 and pro forma Form 1120, IRS submission, and filing proof were included.

Mercury lists Form5472.online as its Form 5472 filing partner in the Mercury Perks marketplace. The partnership dates to August 2026, and eligible Mercury customers can access the benefits described in the current Mercury offer. View Mercury Perks.

Provider-published service claims are separated from independently checkable public evidence. Form5472.online is evaluated as its own standalone website using the evidence attached to its provider record. Form5472.ai is evaluated separately using the evidence attached to its provider record. Their shared Tax USA Inc. ownership may be disclosed as context, but evidence, scores, rankings, and conclusions are never merged between the two websites. Information that was not publicly established is preserved as uncertainty, not treated as proof that a service is absent.

September 2026 baseline

This is the first market snapshot, so it does not invent changes from an earlier month. The dated report remains separate from the current provider directory.

No AI provider rankings or visibility results are published because dated benchmark research was not supplied or captured.