Form 5472 Workpaper Index Guide for Foreign-Owned LLCs (2025-2026)
Form 5472 reporting flow
How a foreign-owned single-member LLC reports its reportable transactions to the IRS.
Identify reportable transactions
Money in/out between the LLC and its foreign owner or related parties.
Prepare pro forma 1120 + 5472
Form 5472 attaches to a pro forma Form 1120 cover page.
File by the deadline
Mail or fax the package by the corporate return due date.
Keep records
Retain transaction records supporting every reported amount.
Key Takeaways
- A workpaper index makes a Form 5472 file easier to defend and reuse.
- The index should connect source documents to reported amounts clearly.
- Exclusions and judgments should be explained, not left implicit.
- A durable index is written for someone new to the file.
A workpaper index turns a tax folder into a defendable file
Many founders keep the right documents but lose the case anyway because the records are impossible to navigate. A workpaper index solves that problem. It should identify the related parties, the categories of transactions, the source folders, the filed amounts, and any special judgments made in preparing the return.
The index should sit between the ledger and the form
Its job is to bridge raw records and reported disclosure. If a transaction total appears on Form 5472 Part IV, the index should point to the workpaper or source set supporting it. If a category was excluded, the index should say why. That is how the business shows that the filing was built systematically rather than assembled from memory.
The best index is written for the next reader, not the current preparer
A founder may understand the file instinctively today. The index is for the future self, the new preparer, the bank reviewer, or the IRS examiner who does not. Writing for that reader is what makes the file durable.
Frequently Asked Questions
Why create a workpaper index if the documents are already saved?
Because saved documents alone do not show how the filed numbers were derived or where each item is supported.
What should a Form 5472 index include?
Include related parties, transaction categories, source locations, reported amounts, and notes on special judgments or exclusions.
Who benefits from the index besides the current preparer?
Future preparers, founders, reviewers, and examiners all benefit from a file that can be navigated quickly.
IRS Form 5472 Instructions
Official IRS source on irs.gov
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