The AI-Powered Automation for Pro Forma 1120 & Form 5472 Filings

Time is money. Keep more of both at tax time.
Reduce preparation time by up to 75% with automation purpose-built for foreign-owned SMLLCs

Instant OCR Extraction

SOC-2 Ready

Drag & drop Forms 5472 for each related party from last year’s clients

Instantly maps data to fields with 99.8% accuracy.

Ready in 30s

Pro Forma 1120

Forms 5472:

Part I- Company Information

Part II- Single Member Information

Part III- Related Party Information

Completed Fields28/29

Foreign-Owned Single-Member LLC Filings Made Effortless

If you have the prior year’s return, FastFile automatically pre-fills the forms - no manual edits required.

Generate fully assembled PDFs ready for review, without ever opening a PDF editor.

Prepare and file extensions for your clients effortlessly.

Reuse prior-year filings to save hours on recurring clients.

All data is protected with industry-standard security practices aligned with SOC 2 principles.

Upload existing documents in bulk. Our engine processes them instantly to get you started in minutes.

Prevent rejections before they happen. Our engine checks for critical logic errors and missing fields as you work.

Gather all information needed to complete the return with no manual input.

Tax preparers only need to review pre-filled drafts—FastFile handles the rest.

Automatically send completed returns directly to the IRS with a single click.

FastFile is currently in beta—book a demo to see these features in action.

Schedule a personalized demo to see how FastFile can streamline your firm's tax workflow. We offer flexible pricing options tailored to your needs.