IRS Form 1118 Guide: Corporate Foreign Tax Credit

1. Introduction – What is Form 1118?

IRS Form 1118, officially titled “Foreign Tax Credit — Corporations,” is a federal tax schedule used by U.S. domestic corporations to calculate and claim a credit for income taxes paid to foreign countries or United States possessions. The Internal Revenue Service (IRS) governs this form under Sections 901 and 960 of the Internal Revenue Code.

Because the U.S. corporate tax system taxes domestic companies on their global earnings, corporations operating internationally face potential double taxation. Form 1118 resolves this issue by granting a credit that directly offsets U.S. corporate income tax liabilities with qualified foreign income taxes.

2. Purpose of the Form

The primary purpose of Form 1118 is to compute the maximum allowable Foreign Tax Credit (FTC) for C-corporations. It ensures that credit is granted for legitimate foreign income taxes while preventing taxpayers from using foreign tax credits to reduce U.S. tax on domestic-source income.

In addition to crediting direct taxes paid by the U.S. corporation, Form 1118 calculates “deemed paid” foreign tax credits under Section 960. This allows parent corporations to claim tax credits for foreign taxes paid by their Controlled Foreign Corporations (CFCs) on subpart F income and Global Intangible Low-Taxed Income (GILTI).

3. Who Needs to File This Form

Domestic C-corporations (and entities electing to be taxed as domestic C-corporations) must file Form 1118 if they wish to claim a Foreign Tax Credit against their U.S. corporate income tax. You are required to file Form 1118 under the following conditions:

• The corporation paid or accrued creditable foreign income, war profits, or excess profits taxes to a foreign nation or U.S. possession.
• The corporation is required to include GILTI or subpart F income from foreign subsidiaries under Section 951 or Section 951A and claims a deemed paid credit under Section 960.
• The corporation received dividends or income from foreign affiliates subject to foreign withholding taxes.

4. Who Is Exempt / Not Required to File

Not all business entities file Form 1118. The IRS provides clear distinctions regarding who does not complete this schedule:

• Individual Taxpayers: Individuals, sole proprietors, estates, and trusts use Form 1116 rather than Form 1118 to claim foreign tax credits.
• Pass-Through Entities: S-corporations and partnerships do not file Form 1118. They pass foreign income and tax information to shareholders or partners on Schedule K-1, who then file Form 1116 or Form 1118 on their own returns.
• Corporations Claiming Deductions: Corporations that elect to deduct foreign taxes as an expense on Form 1120 instead of taking a tax credit do not file Form 1118.
• Domestic-Only Companies: Corporations with no foreign operations, foreign subsidiaries, or foreign tax obligations are not required to file.

5. When to File

Form 1118 is an integral attachment to the corporate income tax return. It must be submitted alongside the corporation’s main annual return and adheres to standard corporate tax deadlines:

• Standard Corporate Due Date: Due on the 15th day of the 4th month following the close of the corporation’s tax year (April 15 for calendar-year filers).
• Extended Deadline: Corporations that request an automatic six-month extension using Form 7004 have until October 15 to submit Form 1118 with Form 1120.

6. Where and How to File

Form 1118 is attached directly to Form 1120 (or specialized corporate returns like Form 1120-L or Form 1120-PC). Most corporations file Form 1118 electronically through the IRS e-file system using approved enterprise tax software.

If filing a paper corporate tax package, place Form 1118 behind Form 1120 in the required assembly order. Mail the complete corporate tax return to the IRS service center address indicated in the official Form 1120 instructions based on the corporation’s location and asset size.

7. Step-by-Step Instructions to Fill the Form

Form 1118 requires separate limitation computations for different categories of foreign income under Section 904(d). Below is an overview of how to navigate the primary schedules on Form 1118:

Schedule	Schedule Title	Description & Key Instructions
Category Selection	Income Category Checkboxes	Select one income category per Form 1118 sheet, such as Section 951A (GILTI) category, Foreign Branch category, Passive category, or General category income.
Schedule A	Taxable Income From Foreign Sources	Report gross income earned by country, allocate directly related expenses, and apportion indirect expenses under Section 861 rules.
Schedule B	Foreign Tax Credit Limitation	Calculate allowable direct foreign tax credits, deemed paid credits, and limitation formulas: (Foreign Taxable Income ÷ Total Taxable Income) × U.S. Tax.
Schedule C	Taxes Deemed Paid Under Section 960	Compute deemed paid foreign tax credits for subpart F inclusions and GILTI inclusions derived from Controlled Foreign Corporations.

8. Required Documents/Information Needed Before Filling

Completing Form 1118 requires extensive international accounting data. Corporations must assemble the following records before starting calculations:

• Form 1120 corporate financial statements, general ledgers, and trial balances.
• Form 5471 (Information Return of U.S. Persons With Respect to Certain Foreign Corporations) schedules for all foreign subsidiaries.
• Foreign tax returns, official tax payment receipts, and dividend withholding statements.
• Expense allocation and apportionment workpapers under Section 861, including interest expense and R&D expense allocations.
• Historical foreign tax credit carryover logs from the preceding 10 corporate tax years.

9. Common Mistakes to Avoid

Due to the complex rules governing corporate international taxation, IRS audits frequently target Form 1118 mistakes. Corporations should avoid these common errors:

• Failing to Separate Income Categories: Combining foreign branch income, GILTI, and general category income on a single Form 1118 sheet. Each category must be calculated on a separate schedule.
• Improper Section 861 Expense Apportionment: Failing to apportion corporate overhead, interest expense, and administrative expenses to foreign source income, which overstates the credit limitation.
• Mishandling GILTI Credit Limitations: Overlooking the fact that unused Section 951A (GILTI) foreign tax credits cannot be carried back or carried forward to other tax years.
• Claiming Non-Income Taxes: Attempting to claim credits for foreign value-added taxes (VAT), sales taxes, or property taxes. Only foreign income or profit taxes qualify.
• Discrepancies with Form 5471: Reporting deemed paid foreign taxes on Schedule C that do not match the underlying foreign tax figures on Form 5471.

10. Penalties for Non-Filing or Errors

Form 1118 does not carry an independent standalone failure-to-file penalty. However, because Form 1118 directly alters the final tax liability on Form 1120, reporting errors can trigger substantial corporate penalties.

If an overclaimed Foreign Tax Credit leads to an underpayment of corporate income tax, the IRS assesses mandatory failure-to-pay penalties and interest. If the IRS determines that an overclaimed credit resulted from negligence or substantial understatement of tax, an accuracy-related penalty of 20% of the underpaid tax applies under Section 6662.

11. Related Forms or Schedules

Form 1118 works closely alongside several other key corporate tax schedules:

• Form 1120: U.S. Corporation Income Tax Return, the primary corporate tax return.
• Form 5471: Information Return of U.S. Persons With Respect to Certain Foreign Corporations, used to report foreign subsidiary activity.
• Form 1118 (Schedule L): Foreign Tax Redeterminations for Corporations, used to report post-filing foreign tax adjustments.
• Form 1116: Foreign Tax Credit, used by individuals, estates, and trusts instead of corporations.

12. Frequently Asked Questions

What is the difference between Form 1116 and Form 1118?

Form 1116 is used by individuals, estates, and trusts to claim foreign tax credits. Form 1118 is used exclusively by domestic C-corporations.

What are “deemed paid” foreign taxes under Section 960?

Deemed paid taxes are foreign income taxes paid by a foreign subsidiary (CFC) that a U.S. parent corporation is allowed to claim as a credit when reporting GILTI or subpart F income.

Can an S-corporation file Form 1118?

No. S-corporations pass through foreign income and foreign taxes to their shareholders on Schedule K-1. Individual shareholders then claim the credit using Form 1116.

Is it better for a corporation to take a Foreign Tax Credit or a deduction?

Taking a Foreign Tax Credit on Form 1118 provides a dollar-for-dollar offset against U.S. corporate tax, which is generally more beneficial than taking an expense deduction on Form 1120.

Can corporations carry forward unused Foreign Tax Credits on Form 1118?

Yes. Unused foreign tax credits in most categories can be carried back 1 tax year and forward up to 10 tax years. However, unused foreign tax credits in the Section 951A (GILTI) category cannot be carried back or forward.

What exchange rate is used to convert foreign taxes on Form 1118?

Direct foreign taxes paid are generally translated into U.S. dollars using the average exchange rate for the tax year in which the foreign taxes were accrued, provided specific statutory conditions are met.

13. Conclusion – Key Takeaways

IRS Form 1118 is a comprehensive tax schedule that allows U.S. domestic corporations to claim Foreign Tax Credits and avoid double taxation on international earnings. By crediting direct foreign taxes and deemed paid taxes under Section 960, corporations can reduce their U.S. corporate tax liability.

Properly categorizing foreign income, correctly apportioning expenses under Section 861 rules, and maintaining detailed reconciliation files with Form 5471 ensures compliance and protects valuable foreign tax credits.