Using Firstbase for your US company? Put Form 5472 in context.

Firstbase's pricing page lists Start, a one-time formation offer for companies in Delaware or Wyoming with EIN setup and banking-partner access, plus standalone Registered Agent, Mailroom Premium, Accounting and Tax Filing subscriptions. Firstbase One bundles those four subscriptions at $199 per month, billed yearly at $2,388 (checked October 5, 2026).

The Firstbase One page says its tax team covers federal, state and local forms, "even the tricky ones like 5472 for foreign-owned companies".

A foreign-owned single-member US LLC has a federal Form 5472 + pro forma Form 1120 filing obligation each year if it had a reportable transaction. The obligation does not disappear because a formation platform filed the state paperwork, acted as registered agent, or helped open operational services.

Form 5472 is an IRS information return. It sits apart from state formation, state registered agent coverage, mailroom services, accounting subscriptions, and state annual reports.

Firstbase's pricing and tax pages list a Tax Filing package for single-member LLCs owned by a non-US citizen or resident at $899 annually per package. It names Forms 5472, a pro forma Form 1120, unlimited Forms 1099-NEC or 1099-MISC and an IRS extension if needed (checked October 5, 2026).

Firstbase One includes that Tax Filing subscription alongside Registered Agent, Mailroom Premium and Accounting. Firstbase's tax page still shows 2025 deadline dates, and the pages checked do not publish an extra-year price, filing method or turnaround, so confirm current terms with Firstbase in writing.

For owners who do not need the package or the bundle, Form5472 Prep is a filing-only alternative: $149 Standard (ready in 5-7 business days) or $199 Express (ready to sign within 24 hours) — identical filing, IRS fax delivery included.

Your first-year filing timeline starts when the LLC is formed, even if that happens partway through the year. The first Form 5472 covers formation through year-end whenever there was a reportable transaction, and the first wire used to fund the LLC bank account is usually enough.

Capital contributions, distributions, owner payments, and related-party reimbursements can all be reportable. The first wire used to fund the LLC's bank account is usually enough to create the first-year filing obligation.

Our wizard collects the filing facts in 12 questions: LLC details, foreign owner details, year-end assets, and related-party transactions. We prepare the pro forma Form 1120, Form 5472, the Part V supporting statement, and a reasonable cause statement when a late filing needs DIIRSP treatment.

A tax accountant who holds an IRS Preparer Tax Identification Number (PTIN) reviews every package before we submit it. We deliver by fax to the IRS Ogden PIN Unit at +1-855-887-7737 and keep the timestamped fax receipt as transmission evidence. 100% money-back guarantee if we fail to submit.

If your Firstbase-formed LLC predates your current tax-filing coverage, or you only discovered the 5472 rule after one or more missed years, DIIRSP is the standard catch-up path for late international information returns. The key is to file the complete missed-year packages together with a reasonable cause statement before an IRS notice arrives.

Form5472 Prep is an independent service and is not affiliated with, endorsed by, or connected to Firstbase.