How to Complete Form 5471 Worksheet A: Subpart F Income

To complete Form 5471 Worksheet A, you enter the controlled foreign corporation’s income by category in its functional currency, run the de minimis and full inclusion tests, apply the high-tax exception, subtract allocable deductions, and multiply the net amount by your ownership percentage. The pro rata figures that result flow to Schedule I, lines 1e through 1h.¹ The worksheet lives in the Form 5471 instructions and runs to more than 50 lines, so most of the work is preparation.

Do You Actually Need Worksheet A

Worksheet A feeds Schedule I, and only some filer categories complete that schedule. If you fall into one of the following, the worksheet applies:

Category 5 filers (5a and 5b): U.S. shareholders who owned stock in a CFC at any time during its tax year and still held it on the last day the entity qualified as a CFC.¹
Category 4 filers: U.S. persons who controlled the foreign corporation for an uninterrupted 30-day period during the year. Schedule I may apply depending on whether the corporation qualifies as a CFC.¹
Category 1 filers: U.S. shareholders of a specified foreign corporation complete Schedule I-1 and related schedules rather than Worksheet A.¹

A U.S. shareholder here means a U.S. person owning 10 percent or more of the total combined voting power or total value of the foreign corporation’s stock.² A CFC is a foreign corporation in which U.S. shareholders collectively own more than 50 percent of the voting power or stock value.³ Both tests include indirect ownership through other entities and constructive ownership through family members, so your reportable stake can be larger than direct shareholdings suggest.

What to Gather Before You Start

Worksheet A is easier when the source records are in front of you. Every amount is entered in the CFC’s functional currency; the dollar conversion happens later in the Form 5471 process.⁴

The CFC’s income statement and balance sheet, prepared under U.S. accounting standards or reconciled to them.
Investment income broken out: dividends, interest, royalties, rents, annuities, and gains from property and commodity transactions. These populate lines 1a through 1i.⁴
Sales and services revenue tied to related parties, especially transactions performed outside the CFC’s country of incorporation. Related-party transactions are the trigger for most foreign base company sales and services income.
Foreign taxes paid by category of income. This matters for the high-tax exception and for any deemed-paid credit downstream.
Total gross income, which you need for the de minimis and full inclusion tests.
Intercompany contracts and invoices that document the related-party relationships.

One note on outdated guidance: foreign base company oil-related income was repealed by the Tax Cuts and Jobs Act. If a checklist tells you to enter oil-related income as a separate line, that checklist predates current law.

Working Through the Line Groups

The worksheet moves through Subpart F income in a fixed sequence: gross amounts by category, then the two tests, then the high-tax exception, then deductions, then the pro rata share. Subpart F income itself is defined broadly and reaches beyond passive investment earnings, covering insurance income, foreign base company income, international boycott-related income, illegal payments of the kind that would violate the Foreign Corrupt Practices Act, and income from sanctioned countries.⁵

Gross Income by Category (Lines 1 Through 7)

Lines 1a through 1i break foreign personal holding company income into its components: dividends and interest, income equivalent to interest, notional principal contract income, foreign currency gains, commodity transaction gains, property transaction gains, payments in lieu of dividends, personal service contract income, and partnership interest sales subject to the look-through rule.⁴ Line 2 totals them.

Lines 3 and 4 capture foreign base company sales income and foreign base company services income. These are the categories driven by related-party transactions and by activity performed outside the CFC’s home country.⁶

Line 5 sums the foreign base company income lines. Line 6 adds insurance income, meaning income from insuring risks outside the CFC’s country. Line 7 is the combined total.

The De Minimis and Full Inclusion Tests (Line 8 Forward)

Both tests hinge on 5 percent of the CFC’s gross income, which you enter on line 8. They can end the calculation early or expand it dramatically.

Under the de minimis rule, if the combined total of foreign base company income and insurance income is less than the lower of 5 percent of the CFC’s gross income or $1 million, none of it is Subpart F income.⁶ Clearing that bar effectively zeroes out the worksheet for the year.

The full inclusion rule pushes the other direction. If foreign base company income and insurance income exceed 70 percent of the CFC’s total gross income, the entire gross income is treated as Subpart F income.⁶ Operating income that would otherwise sit outside Subpart F gets pulled in.

The High-Tax Exception

Income already taxed heavily abroad can be pulled out. The threshold is 90 percent of the maximum U.S. corporate rate.⁶ With the corporate rate at 21 percent,⁷ the effective foreign rate has to exceed 18.9 percent on the specific item. The test runs item by item, not as a blended average across the CFC’s income. Excluded items also drop out of GILTI tested income, so they fall out of both regimes.

Allocable Deductions and the Pro Rata Share

After the tests and the exception, you subtract expenses allocable to each remaining category. That includes directly related costs and a share of overhead such as interest. The point is to reach net income by category, not gross. The final lines apply your ownership percentage to produce a pro rata share, which is what moves to Schedule I and, from there, onto your income tax return.

How the Numbers Are Used Downstream

Two downstream effects are worth watching while you complete the worksheet.

The first is GILTI. The Global Intangible Low-Taxed Income rules exclude any amount already included under Subpart F.⁸ Subpart F runs first; whatever it does not capture becomes the starting point for GILTI. An error on Worksheet A shifts income between the two regimes and changes the foreign tax credit position under each.

The second is the deemed-paid foreign tax credit. When a domestic corporation includes Subpart F income in gross income, it is treated as having paid the foreign taxes the CFC paid on that specific income.⁹ Individual shareholders do not receive this credit directly. The foreign tax credit limitation applies separately to different income baskets, so accurate categorization on Worksheet A carries through to how much of the deemed-paid credit is actually usable.

What Errors and Late Filing Cost

Getting Worksheet A wrong is not just a bookkeeping problem. The initial penalty for failing to file a complete and correct Form 5471 by the due date is $10,000 per annual accounting period, with additional $10,000 increments after IRS notice up to $50,000 more.¹⁰¹¹ Foreign tax credits are also reduced by 10 percent for a failure to furnish, with further reductions if the failure continues after IRS notice. And the statute of limitations for assessment does not begin to run until the required information is furnished, so an unfiled Form 5471 leaves the assessment window open indefinitely on related tax.¹²

Form 5471 is attached to your income tax return and follows the same deadline. For individuals, that means April 15, with an automatic six-month extension available through Form 4868 and a two-month automatic extension for U.S. citizens abroad.¹³ Corporate returns are generally due on the 15th day of the fourth month after the tax year ends. Because the assessment period is tied to filing, keeping Worksheet A and the underlying CFC financials well beyond the standard three-year retention baseline is the safer approach.¹⁴

1
Internal Revenue Service. Instructions for Form 5471
2
Legal Information Institute. 26 USC 951(b) – Definition of United States Shareholder
3
eCFR. 26 CFR 1.957-1 – Definition of Controlled Foreign Corporation
4
Internal Revenue Service. Instructions for Form 5471
5
Office of the Law Revision Counsel. 26 USC 952 – Subpart F Income Defined
6
Office of the Law Revision Counsel. 26 USC 954 – Foreign Base Company Income
7
Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed
8
Office of the Law Revision Counsel. 26 USC 951A – Global Intangible Low-Taxed Income Included in Gross Income
9
Office of the Law Revision Counsel. 26 USC 960 – Deemed Paid Credit for Subpart F Inclusions
10
Office of the Law Revision Counsel. 26 USC 6038 – Information Reporting With Respect to Certain Foreign Corporations and Partnerships
11
Internal Revenue Service. International Information Reporting Penalties
12
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
13
Internal Revenue Service. When to File
14
Internal Revenue Service. How Long Should I Keep Records