Form 5471 and GILTI: What Every CPA Needs to Know This Tax Season

By Tajma Qorri | March 6, 2026

Every March, the same thing happens. A CPA firm discovers that a client they've been filing for years actually owns shares in a foreign corporation. Sometimes the client mentioned it once in passing. Sometimes it shows up as a line on a bank statement from overseas. Sometimes nobody catches it until the IRS sends a notice.

I've spent over a decade in international tax, first at major firms and now in my own practice, and I can tell you: Form 5471 is one of the most consequential forms in the entire Internal Revenue Code. It is also one of the most misunderstood. When you layer in GILTI, the Global Intangible Low-Taxed Income rules under Section 951A, the complexity goes from difficult to genuinely dangerous for the unprepared.

This is tax season. Deadlines are approaching. And the penalty for getting Form 5471 wrong starts at $10,000 per form, per year, and can reach $60,000. That's before any tax liability is even calculated.

This article is written for the CPA who encounters international ownership structures and needs a clear, practitioner-level overview of what Form 5471 requires, how GILTI works, and where the most common mistakes happen.

What Form 5471 Actually Is

Form 5471, "Information Return of U.S. Persons With Respect to Certain Foreign Corporations," is required of U.S. persons who have specified interests in foreign corporations. It reports the financial activity of the foreign entity and determines whether the U.S. shareholder has taxable income under the Subpart F and GILTI rules.

Think of it this way: the IRS can't see into a foreign corporation's books the way it can examine a domestic entity through K-1s and 1099s. Form 5471 is how the government gets that visibility. And they enforce it aggressively.

Who Must File

The filing requirement depends on which "category" of filer the taxpayer falls into. There are five categories, and each one triggers different schedules:

Category 1: U.S. shareholders of specified foreign corporations (SFCs). This is the broadest category and was significantly expanded by the Tax Cuts and Jobs Act. If a U.S. person owns 10% or more of the vote or value of a foreign corporation that qualifies as a CFC, they're a Category 1 filer.

Category 2: U.S. citizens or residents who are officers or directors of a foreign corporation in which a U.S. person has acquired a 10% or greater interest. This is a reporting-only category, but the penalty still applies.

Category 3: U.S. persons who acquire stock in a foreign corporation that brings their ownership to 10% or more, or who dispose of enough stock to drop below 10%. Acquisition and disposition triggers.

Category 4: U.S. persons who had "control" of a foreign corporation during the tax year. Control means more than 50% of vote or value.

Category 5: U.S. shareholders who own 10% or more of a CFC. This is the category that triggers the most schedules, including the GILTI-related schedules.

Most of the clients I work with are Category 1 and Category 5 filers. These are the categories that require full financial reporting and trigger income inclusions under Subpart F and GILTI.

The Penalty

The base penalty under IRC Section 6038(b) is $10,000 per form, per year for failure to file, late filing, or filing with substantially incomplete information. If the IRS sends a notice and the taxpayer doesn't correct within 90 days, an additional $10,000 is assessed for each 30-day period of continued noncompliance, up to a maximum of $60,000 per return.

Those are just the information return penalties. They exist separately from any tax, interest, or accuracy-related penalties that may apply to the underlying income.

For a client who owns interests in two foreign corporations and missed three years of filing, you're looking at potential penalty exposure of $60,000 to $360,000, depending on the facts. I've seen it happen. More than once.

Understanding GILTI: The Tax That Surprises Everyone

Before the Tax Cuts and Jobs Act of 2017, the U.S. generally did not tax the active business income of a controlled foreign corporation until it was repatriated as a dividend. GILTI changed that entirely.

Under Section 951A, every U.S. shareholder of a CFC is required to include in gross income their pro rata share of the CFC's "tested income" that exceeds a deemed 10% return on the CFC's qualified business asset investment (QBAI). This is the GILTI inclusion, and it applies regardless of whether a single dollar is distributed.

In plain language: if your client owns a foreign corporation that earns more than a nominal return on its tangible assets, the excess is taxed in the United States. Every year. Automatically. No distribution required.

How GILTI Is Calculated

The calculation involves several moving parts, all of which flow through Form 5471 and Form 8992:

Tested Income: The CFC's gross income, minus allocable deductions, minus any Subpart F income, minus certain other excluded categories. This is reported on Schedule I-1 of Form 5471.
QBAI (Qualified Business Asset Investment): The CFC's average adjusted basis in tangible depreciable property used in its trade or business, calculated on a quarterly basis. Reported on Schedule H of Form 5471. This is the "return on assets" threshold. Only income exceeding 10% of QBAI is included as GILTI.
Net CFC Tested Income: Aggregated across all CFCs owned by the shareholder. One CFC's tested loss can offset another CFC's tested income.
Net Deemed Tangible Income Return (NDTIR): 10% of the aggregate QBAI across all CFCs, minus certain interest expenses. This is the amount of income that is "shielded" from GILTI.
GILTI Inclusion Amount: Net CFC Tested Income minus NDTIR. This amount is included in the U.S. shareholder's gross income on Form 8992 and flows to the individual or corporate return.

The Section 250 Deduction (Corporate Shareholders Only)

If the U.S. shareholder is a C corporation, it may deduct 50% of its GILTI inclusion under Section 250. This effectively reduces the corporate tax rate on GILTI income from 21% to 10.5%. Combined with foreign tax credits under Section 960, a corporate shareholder with a CFC in a country that taxes at or above 13.125% may owe little or no additional U.S. tax on GILTI.

Individual shareholders, however, get no Section 250 deduction unless they make a Section 962 election to be taxed at corporate rates. I'll get to that shortly, because it's one of the most important planning tools available, and one of the most underutilized.

The Five Mistakes I See CPAs Make Every Filing Season

Mistake #1: Not Identifying CFC Status in the First Place

This is the most fundamental error, and it happens constantly. A CPA has been preparing a client's individual return for years. The client mentions a "small company" overseas, or a bank account appears on a foreign bank statement. The CPA doesn't ask the right follow-up questions, and the filing obligation goes undetected.

Here are the questions that should be on every tax organizer:

Do you own any interest in a foreign corporation, partnership, or trust?
Did you acquire or dispose of any interest in a foreign entity this year?
Do you have signature authority over any foreign financial accounts?
Did any foreign entity make payments to you or on your behalf?

If the answer to any of these is yes, you need to dig deeper. CFC status is determined by ownership percentages and constructive ownership rules under Section 958, which attribute ownership between related parties. After TCJA, the repeal of the downward attribution rule for foreign persons under Section 958(b)(4) means that many foreign corporations that were never previously CFCs now qualify.

Mistake #2: Ignoring the GILTI Calculation for Individual Shareholders

I cannot count the number of times I've reviewed a prior-year return where a CPA filed Form 5471 correctly but completely omitted the GILTI calculation. The form was there. The schedules were filled out. But the tested income never flowed to Form 8992, and no GILTI inclusion appeared on the 1040.

For individual shareholders, GILTI is taxed at ordinary income rates, which can reach 37%. Without the Section 250 deduction (which is only available to C corporations), the tax hit can be substantial. This is not optional reporting. It's a mandatory income inclusion under Section 951A, and failing to include it is an understatement of income.

Mistake #3: Missing the Section 962 Election

The Section 962 election allows an individual U.S. shareholder to elect to be taxed on Subpart F and GILTI inclusions at corporate tax rates instead of individual rates. The shareholder computes the tax as if the income were received by a domestic corporation, applies the Section 250 deduction (reducing the effective rate to 10.5%), and claims deemed-paid foreign tax credits under Section 960.

For clients with CFCs in countries with corporate tax rates above 13.125%, the Section 962 election can reduce the U.S. tax on GILTI to zero or near-zero.

The catch: when the earnings are actually distributed later as a dividend, the shareholder pays tax on the dividend to the extent it exceeds the amount previously included and taxed. But the deferral benefit and rate arbitrage are significant.

I have personally restructured engagements for clients who were paying 37% on GILTI inclusions that should have been taxed at 10.5%. The savings run into the tens of thousands of dollars. This is not an obscure planning technique. It's standard practice in international tax, but many general practitioners don't know it exists.

Mistake #4: Getting QBAI Wrong

QBAI is straightforward in concept but error-prone in execution. The calculation uses the CFC's adjusted basis in tangible depreciable property, determined under the alternative depreciation system (ADS) on a quarterly average basis.

Common errors I see:

Using the wrong depreciation method. QBAI requires ADS straight-line, not MACRS or the method used on the CFC's local books.
Including non-depreciable assets. Land is not QBAI. Neither is inventory.
Failing to convert to U.S. dollars correctly. QBAI should be calculated in the CFC's functional currency first, then translated at the appropriate exchange rate.
Ignoring the anti-abuse rules. Assets acquired with a principal purpose of increasing QBAI are disregarded under Reg. Section 1.951A-3(h).

For service-based CFCs with minimal tangible assets, QBAI is often close to zero. That means nearly all of the CFC's tested income becomes GILTI. This is exactly the scenario the rules were designed to capture, but it surprises practitioners who assume a small foreign consulting firm shouldn't trigger significant U.S. tax.

Mistake #5: Not Preparing for the 2026 GILTI Changes

This is the forward-looking issue every practitioner needs to understand. The One Big Beautiful Bill Act (OBBBA) made significant changes to the GILTI regime effective for tax years beginning after December 31, 2025.

Key changes:

GILTI is being replaced by Net CFC Tested Income (NCTI). The mechanics are similar, but the calculation shifts to a country-by-country approach rather than the current global blending method. This means a high-tax CFC in Germany can no longer offset a low-tax CFC in a tax haven. Each jurisdiction is evaluated independently.
The QBAI deduction is eliminated. Under NCTI, there is no deemed return on tangible assets. All net tested income above a specified threshold is included. This increases the taxable amount for CFCs with significant tangible operations.
The Section 250 deduction decreases from 50% to 37.5%, increasing the effective corporate rate on NCTI from 10.5% to approximately 13.125%.
The high-tax exclusion threshold changes. The current GILTI high-tax exclusion applies when the effective foreign tax rate exceeds 18.9% (90% of the 21% corporate rate). Under NCTI with the reduced Section 250 deduction, the relevant threshold is recalculated.

For the 2025 tax year that you're filing right now, the current GILTI rules still apply. But any tax planning advice you're giving clients about their foreign corporate structures should account for the NCTI transition. Structures that produce minimal GILTI today may produce significant NCTI in 2026.

The High-Tax Exclusion: When GILTI Doesn't Apply

Under Reg. Section 1.951A-2(c)(7), a CFC's tested income can be excluded from GILTI if it's subject to a sufficiently high rate of foreign tax. The threshold is an effective rate exceeding 90% of the maximum U.S. corporate rate (currently 21%), which works out to 18.9%.

The election is made annually and applies to all CFCs of the U.S. shareholder on a tested-unit basis. It's a powerful tool when the CFC operates in a high-tax jurisdiction like Germany (approximately 30%), Japan (approximately 30%), or France (approximately 25%).

The mechanics require careful analysis. You need to determine the effective foreign tax rate on a tested-unit basis, which means allocating income and taxes to specific business units within a CFC. It's not simply a matter of comparing the CFC's total foreign tax to its total income.

When it works, the high-tax exclusion eliminates the GILTI inclusion entirely for that tested unit. When it doesn't, because the CFC has mixed income streams or the rate falls just below 18.9%, the entire tested income is included.

What This Means for Your Practice

If you're a CPA encountering these issues for the first time, here's my honest assessment: this is specialized work. The interaction between Form 5471 reporting, GILTI calculations, Section 962 elections, foreign tax credits under Section 960, and the upcoming NCTI transition creates a level of complexity that goes well beyond standard individual or corporate tax preparation.

That doesn't mean you need to turn the client away. But it does mean you need either the internal expertise to handle it correctly or a reliable specialist to partner with.

In my practice, I work with CPA firms across the country on exactly this type of engagement. The referring CPA maintains the client relationship and handles the domestic return. I handle the international components: Form 5471 preparation, GILTI calculations, Section 962 analysis, and the associated planning. The client gets the best of both worlds, and the CPA firm doesn't take on risk in an area outside its core expertise.

The worst outcome is filing Form 5471 without the GILTI calculation, or filing the GILTI calculation without considering Section 962, or doing all of the above without preparing the client for how NCTI will change the math starting next year. Each of these gaps creates exposure for the client and for the preparer.

Key Takeaways

Form 5471 is mandatory for U.S. persons with 10%+ ownership in foreign corporations. Penalties start at $10,000 per form and can reach $60,000.
GILTI applies automatically to all U.S. shareholders of CFCs. Tested income above the deemed return on QBAI is included in the shareholder's gross income regardless of distributions.
Individual shareholders pay up to 37% on GILTI unless they make a Section 962 election. The 962 election can reduce the effective rate to 10.5% or less.
The high-tax exclusion can eliminate GILTI entirely for CFCs in jurisdictions with effective rates above 18.9%.
2026 brings major changes. GILTI is becoming NCTI under the OBBBA. Country-by-country calculation, elimination of QBAI, and a reduced Section 250 deduction will increase the tax burden for many structures.
This is specialized work. If international tax isn't your primary focus, partner with a specialist who handles it every day. The penalties for getting it wrong are too severe, and the planning opportunities for getting it right are too valuable to miss.

Tajma Qorri is the founder of Qorri Tax Service LLC, a boutique international tax consulting firm based in Park Ridge, Illinois. She specializes in U.S. international tax compliance and planning for foreign-owned businesses, U.S. individuals with foreign assets, and CPA firms that need international tax support. To discuss a client situation or explore a referral partnership, request a free consultation.