A foreign corporation that earns income connected to a U.S. trade or business, holds U.S. real estate, or receives certain U.S.-source income usually must file IRS Form 1120-F every year. The form reports income that is effectively connected to the United States, claims treaty positions, and computes the regular corporate tax plus the branch profits tax under Internal Revenue Code §884.
Missing the filing window is costly. The IRS reports that foreign corporations face a hard 18-month deadline under Treasury Regulation §1.882-4 — file late and the IRS can deny every deduction and credit, taxing your gross U.S. income at 21%.
Here is what this guide gives you:
- 📄 A full line-by-line walk-through of all 8 pages of Form 1120-F plus every schedule
- ⚖️ How to claim treaty benefits using Form 8833 and avoid §6114 penalties
- 💰 Branch profits tax math under IRC §884, with worked examples for UK, Canadian, and Japanese parents
- 🚫 The deduction-disallowance trap of §882(c)(2) and the protective return that saves you
- 🗺️ Federal mechanics first, then the California, New York, and Texas state nuances that trip up foreign filers
Who Must File Form 1120-F
A foreign corporation files Form 1120-F when it has any of three basic links to the United States during the tax year. The first link is engaging in a trade or business inside the U.S., even if the activity made no money. The second link is having income that is treated as effectively connected to a U.S. trade or business under IRC §864. The third link is owing tax, claiming a refund, or making a treaty-based claim under IRC §6114.
The phrase foreign corporation means a corporation that is not created or organized inside the United States or under federal or state law, as defined in IRC §7701(a)(5). The IRS does not care where the company is managed or where its directors meet. The only test for entity-level residence is the place of incorporation, which differs from the rules used in many treaty countries. A common misconception is that having a U.S. CEO turns a foreign corporation into a domestic one — it does not.
The consequence of skipping the form is steep. Without a timely return, Treasury Regulation §1.882-4 blocks every deduction, so the IRS taxes the entire gross U.S. revenue at 21%. The Tax Court confirmed this rule in Swallows Holding, Ltd. v. Commissioner, and the Federal Circuit reaffirmed it in Adams Challenge (UK) Ltd. v. Commissioner.
Effectively Connected Income (ECI)
Effectively connected income is income produced by, or because of, a U.S. trade or business. The rules in IRC §864(c) apply two tests: the asset-use test and the business-activities test. Income from selling inventory in the U.S., performing services in the U.S., or earning rent from actively managed U.S. property is usually ECI. ECI is taxed at the regular 21% corporate rate on a net basis, meaning ordinary deductions reduce the tax base.
A common mistake is thinking that one short business trip cannot trigger ECI. In Pinchot v. Commissioner, the court found that even minimal but regular U.S. activity creates a U.S. trade or business. The consequence is that a foreign corporation with sporadic U.S. sales calls may still owe a return, plus the §6651 failure-to-file penalty if it ignores the obligation.
Fixed, Determinable, Annual, or Periodical Income (FDAP)
FDAP income covers passive flows like U.S.-source dividends, interest, rents, royalties, and certain gains under IRC §881. The default tax rate on FDAP is a flat 30% on the gross amount, withheld at the source by the U.S. payer under IRC §1442. Treaties often cut this rate to 15%, 10%, 5%, or 0%.
If withholding is correct and final, a pure FDAP corporation does not have to file Form 1120-F. But if withholding was too high, the only way to claim a refund is to file. The same is true if a treaty rate applies but the payer used the statutory 30% rate.
FIRPTA and U.S. Real Property
The Foreign Investment in Real Property Tax Act treats gain from selling a U.S. real property interest as ECI under IRC §897. The buyer must withhold 15% of the gross sale price under IRC §1445, and the seller files Form 1120-F to true up the actual tax. A foreign corporation that holds shares in a U.S. real property holding corporation is also caught.
The consequence of forgetting FIRPTA is double trouble: the buyer becomes liable for unpaid withholding, and the seller still owes regular corporate tax. A real-world example is Kenji Tanaka’s Japanese parent company selling a Manhattan office tower — the buyer’s lawyer must hold back 15% at closing, and the parent files Form 1120-F the next spring to claim depreciation deductions and recover excess withholding.
When and Where to File
A foreign corporation with a U.S. office files by the 15th day of the 4th month after year-end, per the Form 1120-F instructions. For calendar-year filers, that means April 15, 2026 for tax year 2025. A foreign corporation without a U.S. office gets until the 15th day of the 6th month, so June 15, 2026 for 2025.
Filing late by even one day can violate the §1.882-4 deduction rule. The regulation gives an absolute outside date of 18 months past the original unextended due date. Miss that date, and the IRS taxes your gross ECI at 21%, ignoring rent, payroll, depreciation, and interest expense. The plain-English meaning is that being late by 18 months and one day can turn a $0 tax bill into a six- or seven-figure liability.
A six-month extension is available using Form 7004, filed by the original due date. The extension covers filing only, not payment — interest still accrues on any unpaid balance from the original due date. Mail returns to the address listed in the Form 1120-F instructions, or e-file through an authorized IRS provider.
Protective Returns
A protective return is a Form 1120-F filed by a foreign corporation that believes it has no ECI but wants to lock in deductions in case the IRS later disagrees. The mechanism comes from Treasury Regulation §1.882-4(a)(3)(vi). The taxpayer files a return with no income or deductions on it but checks the protective-return box on Page 1.
The consequence of skipping a protective return when ECI is uncertain is harsh. If the IRS audits and finds even small ECI, every deduction is gone unless a timely return — protective or not — sat on file. A common misconception is that a protective return invites scrutiny. It does not, because the form reports no income; it simply preserves rights.
A real-world example is Sophia Müller’s German GmbH that licenses software to U.S. customers but believes its activity is too thin to be a U.S. trade or business. Sophia files a protective Form 1120-F by June 15, 2026, attaches a Form 8833 treaty disclosure, and sleeps well knowing that any future IRS challenge cannot strip her German parent of its U.S. expense deductions.
Page 1 — Identification, Tax, and Payments
Page 1 carries the corporation’s name, address, country of incorporation, employer identification number, and several check boxes. The country of incorporation line drives treaty eligibility, so a Bermuda company with a U.K. management team must still write Bermuda. The EIN is mandatory; a foreign corporation without one applies on Form SS-4 before filing.
Section I of Page 1 reports income from sources without a U.S. trade or business — usually FDAP that the company chooses to reconcile on the return. Section II computes the regular corporate tax on ECI. Section III computes the branch profits tax under IRC §884 and the branch-level interest tax. The final lines combine these three sections, subtract credits and prepayments, and produce the balance due or refund.
A common mistake is filing Page 1 only and skipping the schedules. The IRS treats a return without required schedules as incomplete, which can void the protection of §1.882-4. The consequence is the same as not filing at all: full deduction disallowance.
Filing Status Boxes
The top of Page 1 has check boxes for protective return, initial return, final return, name change, address change, and amended return. Each box has tax meaning. Checking final return tells the IRS the corporation has wound up U.S. activity, which can trigger the branch profits tax on a complete termination under Treasury Regulation §1.884-2T.
A common misconception is that initial return is harmless. In reality, an initial return that omits a §6114 treaty disclosure on Form 8833 can cost a $10,000 penalty per position under IRC §6712. Always pair the initial return with a complete treaty package.
Section I — FDAP and Other Non-ECI Income
Section I of Form 1120-F reports U.S.-source income that is not effectively connected. Lines 1 through 9 break out interest, dividends, rents, royalties, and gains. Line 10 totals the gross income, and line 12 lists the tax already withheld at source.
The plain-English purpose is to reconcile the actual U.S. tax owed against the amount the U.S. payer withheld. If a Canadian parent received a U.S. dividend with 30% withheld, but the U.S.-Canada treaty caps the rate at 5%, Section I claims a refund for the 25% over-withholding.
The consequence of ignoring Section I is a permanent loss of refund rights after three years under IRC §6511. A common mistake is double-reporting: putting U.S. dividend income in both Section I and Section II. Pick the right section based on whether the income is ECI.
Section II — Income Effectively Connected With a U.S. Trade or Business
Section II is the heart of the return. Lines 1 through 10 mirror the income lines of a domestic Form 1120: gross receipts, cost of goods sold, dividends, interest, rents, royalties, capital gains, and other income. Lines 12 through 29 list deductions: salaries, repairs, rents, taxes, interest, charitable contributions, depreciation, depletion, advertising, and pension plans.
The what is straightforward: report only ECI items. The why matters more. Under IRC §882(c), deductions are allowed only against ECI and only if a timely, true, and accurate return is on file. The consequence of using a non-ECI deduction here is that the IRS will deny it on audit and may assert accuracy-related penalties under IRC §6662.
Allocating Deductions to ECI
Foreign corporations rarely incur expenses that are 100% U.S. The allocation and apportionment rules in Treasury Regulation §1.861-8 split worldwide expenses between U.S. and foreign source income. Interest expense follows the special rules of Treasury Regulation §1.882-5, which uses a three-step formula based on U.S. assets, worldwide debt, and average interest rates.
A common mistake is plugging in the parent’s worldwide interest expense without running the §1.882-5 calculation. The consequence is an IRS adjustment that often increases taxable ECI, because the formulaic interest deduction is usually smaller than what the books show. A real-world example is Liam O’Connor’s Irish trading company that wrote off €4 million of group interest on its U.S. branch books — a §1.882-5 audit cut the U.S. deduction to €1.6 million and added a 20% accuracy penalty.
Net Operating Losses (NOLs)
A foreign corporation can carry forward net operating losses to offset future ECI, but only if it filed timely returns in the loss years. The Tax Cuts and Jobs Act limits post-2017 NOLs to 80% of taxable income each year. Pre-2018 NOLs do not face the 80% cap but do expire 20 years after generation.
The consequence of a missed return is that the NOL never comes into existence for U.S. tax purposes, because §1.882-4 denies the underlying deductions. A protective return preserves the NOL even when the taxpayer believes there was no ECI.
Section III — Branch Profits Tax and Branch-Level Interest Tax
Section III imposes the branch profits tax under IRC §884(a) at a 30% rate on the dividend equivalent amount. The dividend equivalent amount is roughly the after-tax ECI that is not reinvested in U.S. assets. The plain-English idea is that Congress wanted parity between a U.S. subsidiary that pays a dividend (which faces 30% withholding) and a U.S. branch that repatriates earnings (which would otherwise face nothing).
A treaty often cuts the 30% to 5%, 10%, or 15%, but only if the foreign parent is a qualified resident of the treaty country. The consequence of failing the qualified resident test is the full 30% rate. A common misconception is that the branch profits tax disappears when the branch keeps cash in the U.S. — the test is whether U.S. net equity grows or shrinks, not the cash balance.
Branch-Level Interest Tax
The branch-level interest tax in IRC §884(f) treats interest paid by a U.S. branch as if paid by a U.S. corporation, subject to 30% withholding (or a treaty rate). It also taxes excess interest — the gap between actual interest paid and the §1.882-5 deduction — as if paid to the foreign parent.
A real-world example is Hiroshi Sato’s Japanese trading branch in Los Angeles that pays $5 million of interest to its Tokyo parent. Under the U.S.-Japan treaty, the rate drops to 10%, but only if Hiroshi attaches a treaty-based Form 8833. Skip the disclosure, and the IRS can charge $10,000 under §6712 plus the difference between 30% and 10%.
The Schedules — Line by Line
Form 1120-F includes more than a dozen schedules. Each schedule has its own job. Skipping any required schedule can void the return.
Schedule H — Allocation of Home Office Expenses
Schedule H reports head-office and other expenses allocated under §1.861-8. The schedule asks for the worldwide expense pool, the apportionment key, and the U.S. share. The consequence of leaving Schedule H blank when home-office expenses are claimed is automatic disallowance of those expenses.
A common mistake is using a single apportionment key for every cost category. The regulation requires separate keys for stewardship, R&D, and general administrative costs.
Schedule I — Interest Expense Allocation Under §1.882-5
Schedule I walks through the three-step §1.882-5 calculation: U.S. assets, U.S.-connected liabilities, and the allowable interest deduction. Step 1 measures U.S. assets at adjusted basis. Step 2 multiplies U.S. assets by the worldwide debt-to-asset ratio. Step 3 multiplies that liability number by the average interest rate.
The consequence of a wrong Schedule I is a permanent disallowance of excess interest. A common misconception is that elective methods, like the separate currency pools method, are always better than the default; in many years the default produces a larger deduction.
Schedule J — Tax Computation
Schedule J computes the regular corporate tax at 21% under IRC §11 and applies tax credits like the foreign tax credit, general business credit, and prior year minimum tax credit. It also handles the base erosion and anti-abuse tax (BEAT) under §59A and the corporate alternative minimum tax (CAMT) under §55 for very large groups.
Schedules L, M-1, and M-2 — Balance Sheet and Book-Tax Reconciliation
Schedule L reports U.S. branch balance sheet items. Schedule M-1 reconciles book income to tax income. Schedule M-2 tracks unappropriated retained earnings of the U.S. branch. Corporations with $10 million or more of total assets must file Schedule M-3 instead of the M-1.
Schedule P — Partner’s Share From a U.S. Partnership
Schedule P reports the foreign corporation’s distributive share of ECI from a U.S. partnership. Withholding under IRC §1446 typically covers most of the tax, but the foreign partner still files to claim deductions, NOLs, and treaty benefits.
Schedule S — Exclusion of Income From International Shipping
Schedule S lets a foreign corporation exclude qualifying international shipping or aircraft income under IRC §883. The exclusion requires reciprocity from the home country and detailed ownership disclosures.
Schedule V — List of Vessels or Aircraft
Schedule V lists each vessel or aircraft for which an §883 exclusion is claimed.
Schedule W — Overpayment from §1446
Schedule W reconciles withholding done by U.S. partnerships with the foreign partner’s actual liability and claims any refund due.
Treaty Positions and Form 8833
Whenever a foreign corporation uses a tax treaty to reduce or eliminate U.S. tax, IRC §6114 requires a written disclosure on Form 8833. The disclosure names the treaty article, the facts, and the dollar amount of the benefit claimed. The consequence of forgetting the disclosure is the $10,000 §6712 penalty, separate from any tax adjustment.
A common misconception is that small benefits do not need a disclosure. The threshold for automatic exemption is narrow — most active-business positions still trigger the form. Maya Patel’s Indian software company that claims a permanent establishment exemption under Article 5 of the U.S.-India treaty must attach Form 8833 even though the bottom-line tax is zero.
Worked Example #1 — UK Ltd. With a U.S. Branch
Emma Whitfield’s U.K. consulting company, Whitfield Ltd., has a New York branch that earned $4,000,000 of ECI in 2025. Direct branch expenses were $2,800,000, leaving net ECI of $1,200,000. Regular U.S. corporate tax is 21% × $1,200,000 = $252,000. After-tax ECI is $948,000.
The U.S. branch’s net equity grew by $200,000, so the dividend equivalent amount is $948,000 − $200,000 = $748,000. The U.S.-U.K. treaty cuts the branch profits tax to 5% under Article 10(8). The branch profits tax is 5% × $748,000 = $37,400. Total federal tax: $289,400. Whitfield Ltd. attaches Form 8833 to disclose the treaty rate.
Worked Example #2 — Cayman Fund With ECI From a U.S. Partnership
Aaron Goldberg’s Cayman feeder fund holds a 20% interest in a Delaware lending partnership that generates $5,000,000 of ECI. The partnership withholds $1,050,000 (21%) under IRC §1446 and remits it on Form 8804. The Cayman fund files Form 1120-F with Schedule P showing the $1,000,000 distributive share, claims $200,000 of allocated home-office and interest expense under §1.882-5, and reports net ECI of $800,000.
Tax is 21% × $800,000 = $168,000. The fund claims the $210,000 §1446 withholding share as a prepayment on Schedule W, producing a $42,000 refund. Cayman has no income tax treaty with the U.S., so there is no treaty position to disclose. Branch profits tax still applies at the full 30% rate on the dividend equivalent amount.
Worked Example #3 — Japanese Parent Selling U.S. Real Estate
Kenji Tanaka’s Japanese parent, Tanaka Holdings KK, sells a Houston warehouse for $20,000,000. Adjusted basis is $12,000,000, so the gain is $8,000,000. The buyer withholds 15% × $20,000,000 = $3,000,000 under §1445.
Under §897, the gain is ECI taxed at 21%, producing $1,680,000 of tax. The branch profits tax can apply on the after-tax gain unless the foreign corporation makes a complete termination election under §1.884-2T, which Tanaka Holdings does because it sold its only U.S. property. Net refund: $3,000,000 − $1,680,000 = $1,320,000, claimed on Form 1120-F.
Three Common Scenarios
The table below shows three frequent fact patterns and the tax outcome for each.
| Fact Pattern | Tax Outcome |
|---|---|
| Foreign parent files Form 1120-F by the original due date with full schedules and Form 8833 | Deductions allowed, treaty rate applied, NOLs preserved |
| Foreign parent files 19 months late with $5M ECI and $4M deductions | All $4M deductions denied under §1.882-4, tax owed on full $5M at 21% = $1.05M |
| Foreign parent files protective return with no income reported, treaty memo attached | No tax due, deductions preserved against future audit, treaty rights locked in |
| Activity in the U.S. | Filing Result |
|---|---|
| Sales office that solicits orders and signs contracts | ECI, full Form 1120-F with Section II |
| Passive U.S. dividend income with correct 30% withholding | No filing required if treaty rate matches |
| Partnership interest generating ECI | Schedule P required, plus full Form 1120-F |
| Treaty Position | Disclosure Action |
|---|---|
| Claiming reduced 5% branch profits tax under U.S.-U.K. treaty | Form 8833 attached, Article 10(8) cited |
| Asserting no permanent establishment under U.S.-India treaty | Form 8833 attached, Article 5 cited |
| Using statutory 30% rate with no treaty | No Form 8833 needed |
Mistakes to Avoid
- Filing past the 18-month wall. Every deduction vanishes the day you cross the line in §1.882-4. The consequence is gross-basis tax at 21%.
- Skipping the protective return. Without one, an IRS audit that finds even $1 of ECI strips every deduction. The cost is often six figures.
- Omitting Form 8833. Each undisclosed treaty position is a $10,000 penalty under §6712, per year, per position.
- Using book interest instead of §1.882-5. The IRS will recompute interest under §1.882-5 and add accuracy penalties of 20% under §6662.
- Confusing FDAP with ECI. Reporting passive royalties in Section II overstates net income and triggers wrong tax math.
- Forgetting the branch profits tax. The 30% (or treaty) layer surprises foreign CFOs who only model regular corporate tax.
- Missing Schedule M-3 when assets exceed $10M. The IRS treats the return as incomplete and can disallow deductions.
- Filing without an EIN. The IRS cannot process the return; failure-to-file penalties accrue while you wait.
- Ignoring §6038A and Form 5472. A 25% foreign-owned U.S. branch must file Form 5472 for each related-party transaction, with a $25,000 minimum penalty per missed form.
- Treating initial return as harmless. Failing to disclose treaty positions on the first return can multiply penalties for years.
Do’s and Don’ts
- Do file by the original due date, even if you need to amend later, because timely filing protects the §882(c) deduction right.
- Do file a protective return whenever ECI is uncertain, since it costs almost nothing and saves deductions.
- Do attach Form 8833 for every treaty position, because the $10,000 penalty applies even if the position is correct.
- Do keep contemporaneous documentation for §1.882-5 inputs, since the IRS asks for U.S. assets and worldwide debt schedules first on audit.
- Do track U.S. net equity year over year to forecast the branch profits tax base.
- Don’t rely on the parent’s home-country accounting for U.S. cost of goods sold; U.S. tax basis rules differ.
- Don’t assume incorporation in a treaty country is enough — the limitation on benefits article must be satisfied.
- Don’t mix ECI and FDAP in the same income line; use Section I for FDAP and Section II for ECI.
- Don’t delete prior NOLs from your tracking schedule simply because the IRS did not ask about them last year.
- Don’t forget state filings; California, New York, and Texas have their own tests that ignore federal ECI.
Pros and Cons of Filing Form 1120-F
- Pro: Filing preserves deductions under §882(c), protecting cash flow.
- Pro: Filing locks in treaty benefits and prevents the $10,000 §6712 penalty.
- Pro: Filing creates a record that supports refund claims under §6511.
- Pro: Filing builds NOLs that offset future ECI, sometimes for two decades.
- Pro: Filing a protective return shows good faith if a later IRS audit finds ECI.
- Con: The form is complex, often requiring §1.882-5 calculations and home-office allocations.
- Con: Filing draws U.S. tax authority attention, including potential Form 5472 follow-up.
- Con: Filing can trigger state nexus questions in California, New York, and elsewhere.
- Con: Preparation fees often run $5,000 to $50,000 for mid-size groups.
- Con: Filing can require restating prior years if past returns were wrong, which lengthens audit windows.
State Nuances
State income or franchise tax does not piggyback cleanly off federal ECI. California’s Form 100 uses the water’s-edge election or worldwide unitary combined reporting, taxing the foreign corporation’s California-source income at 8.84%. The consequence of skipping a California filing while filing federal Form 1120-F is a separate $2,000 minimum tax and franchise penalties.
New York’s Form CT-3 imposes a corporate franchise tax on foreign corporations doing business in the state, plus the New York City General Corporation Tax for City activity. New York treats economic nexus as enough for tax even without a New York office. Texas uses the franchise tax (margin tax) on Texas-sourced revenue at 0.375% or 0.75%, with no income tax. A common misconception is that no state income tax in Texas means no state filing — Texas still requires the franchise return for any foreign corporation with Texas nexus.
Key Court Rulings
The Tax Court in Swallows Holding, Ltd. v. Commissioner upheld the validity of the §1.882-4 18-month rule, rejecting a Bermuda parent’s argument that the rule was an invalid regulation. The Federal Circuit in Adams Challenge (UK) Ltd. v. Commissioner confirmed that even a U.K. corporation cannot use the U.S.-U.K. treaty’s nondiscrimination article to escape §1.882-4. The plain-English takeaway is that timely filing is mandatory and treaties do not rescue late filers.
The Tax Court in InverWorld, Ltd. v. Commissioner clarified that a foreign corporation can have a U.S. trade or business through a U.S. agent, even without its own office. The consequence is that a dependent agent with contract-signing authority creates ECI, regardless of where the parent is based.
Penalties and Information Reporting
Failure to file on time triggers the §6651 penalty of 5% of unpaid tax per month, capped at 25%. Failure to pay adds another 0.5% per month. Accuracy-related penalties under §6662 hit 20% of any underpayment from negligence or substantial understatement.
A 25% foreign-owned U.S. branch must also file Form 5472 for each related-party transaction under IRC §6038A and IRC §6038C. The penalty for each missed form is $25,000, with $25,000 per month after IRS notice. A real-world example is Olivia Andersson’s Swedish parent missing five Form 5472 filings — the IRS assessed $125,000 even though zero tax was due.
CAMT and BEAT for Large Foreign Corporations
The corporate alternative minimum tax (CAMT) under §55 hits foreign-parented multinational groups with $1 billion of average global financial-statement income, taxing 15% of adjusted financial statement income tied to U.S. operations. Notice 2023-7 and follow-up guidance explain the foreign-parented group rules.
The base erosion and anti-abuse tax (BEAT) under §59A applies to a foreign corporation’s U.S. branch with $500 million of average gross receipts and a 3% base erosion percentage. BEAT adds 10% (rising in later years) of modified taxable income, recomputed without deductible payments to foreign related parties. The consequence of overlooking BEAT is a surprise tax bill that can double the regular Form 1120-F liability.
Frequently Asked Questions
Does every foreign corporation that touches the U.S. need to file Form 1120-F?
No. A foreign corporation with only correctly withheld FDAP income and no U.S. trade or business does not need to file, but most foreign corporations with any active U.S. presence should file at least a protective return.
Can I e-file Form 1120-F?
Yes. The IRS accepts e-filed Form 1120-F through authorized providers, and large corporations with $10 million or more in assets generally must e-file under Treasury Regulation §301.6011-5.
Is a protective return really worth filing?
Yes. A protective return preserves deductions under §1.882-4 at almost no cost, and it does not commit the corporation to having ECI in any given year.
Will filing Form 1120-F create state tax nexus?
Yes. Many states use federal ECI signals to assert nexus, so a foreign corporation should expect to evaluate California, New York, Texas, and other states whenever it files federally.
Can a treaty eliminate the branch profits tax?
Yes. Treaties with the U.K., Germany, Japan, the Netherlands, and others reduce the rate to 0%, 5%, or 10% if the foreign parent passes the limitation-on-benefits and qualified-resident tests in the treaty.
Does FIRPTA withholding finish my U.S. tax obligation?
No. FIRPTA withholding is a prepayment, not a final tax, so the foreign corporation must file Form 1120-F to compute the actual liability and claim a refund or pay any extra tax.
Are deductions ever allowed on a late-filed Form 1120-F?
No. Once 18 months pass after the original due date, §1.882-4 blocks deductions, with very narrow waiver relief that the IRS rarely grants.
Do I need an EIN before filing?
Yes. The IRS requires an EIN on every Form 1120-F, and a foreign corporation can apply on Form SS-4 by fax or mail before the return is due.
Can I deduct interest paid to my foreign parent?
Yes. Interest paid to a foreign parent is deductible if the §1.882-5 formula allows it and the §267A anti-hybrid rules and the §163(j) interest limit do not disallow it.
Does CAMT apply to small foreign corporations?
No. CAMT applies only to groups whose three-year average global financial-statement income exceeds $1 billion, so most foreign corporations are out of scope.
Can I claim a foreign tax credit on Form 1120-F?
Yes. A foreign corporation can claim a foreign tax credit on Form 1118 for foreign taxes paid on income that is also U.S. ECI, subject to the §904 limitation.
Is Form 5472 required even if no tax is due?
Yes. Form 5472 is required for each reportable related-party transaction under §6038A regardless of tax due, with a $25,000 minimum penalty per missed form.
Does filing late always cost the failure-to-file penalty?
No. If no tax is due, the §6651 failure-to-file penalty is zero, but the deduction-disallowance rule of §1.882-4 still applies and can convert a no-tax position into a taxable one.
Related reading
- How, When And Where Do You Deduct Foreign Tax Paid? + FAQs
- How to Fill Out IRS Form W-8ECI (w/Examples) + FAQs
- How to Fill Out IRS Form 8833 (w/Examples) + FAQs
- How to Fill Out IRS Form 8840 (w/Examples) + FAQs
- How to Fill Out IRS Form 8858 (w/Examples) + FAQs
- How to Fill Out IRS Form 5471 (w/Examples) + FAQs
- How to Fill Out IRS Form 8300 (w/Examples) + FAQs