Receita Federal and US LLCs: No Tax Treaty, No Safety Net

Brazil is the world's ninth-largest economy. The US is its second-largest trading partner. And there is no income tax treaty between them. No reduced withholding rates. No tie-breaker provisions. No mutual agreement procedure. No competent authority mechanism when both countries tax the same income.

Most LLC formation guides assume some treaty relief exists between the founder's home country and the US. They talk about reduced withholding, tie-breaker rules, foreign tax credit mechanisms. For Brazilian founders, none of that applies. The tax relationship between Brazil and the US runs entirely on each country's domestic law, with no coordination beyond the FATCA Intergovernmental Agreement (IGA) signed in 2014.

What does that actually mean? The IRS applies the full 30% withholding on FDAP income. The Receita Federal taxes worldwide income at up to 27.5%. Carnê-Leão payments are due monthly, not annually. BACEN requires separate reporting of all foreign assets. Every obligation runs on its own schedule, in its own jurisdiction, with its own penalty regime.

What "no treaty" means in practice

No treaty creates five specific gaps that treaty countries never deal with:

1. No reduced withholding rates

When a US-source payment (dividends, interest, royalties, service fees) goes to a Brazilian resident, the default IRS withholding rate of 30% applies under IRC Section 1441. Treaty countries negotiate that down to 15% on dividends, 10% on interest, 0-10% on royalties. Brazil gets none of these reductions. A Brazilian founder whose LLC receives royalty income from a US client pays the full 30%.

For effectively connected income (ECI), the 30% flat withholding doesn't apply. Instead, it's taxed at graduated rates (10-37%) on Form 1040-NR. But FDAP income that isn't ECI hits the full 30%.

2. No tie-breaker provisions

Tax treaties include a "tie-breaker" article that determines which country gets primary taxing rights when someone qualifies as a resident of both. Without a treaty, if a Brazilian founder spends enough time in the US to trigger the Substantial Presence Test (183 days over a three-year weighted period), both countries claim the founder as a full tax resident simultaneously. No mechanism to resolve it. Both the IRS and Receita Federal tax worldwide income, independently.

3. No mutual agreement procedure

Treaty countries provide a Mutual Agreement Procedure (MAP) where the two tax authorities negotiate to eliminate double taxation in specific cases. For Brazil-US situations, MAP doesn't exist. If both countries tax the same income, there's no bilateral forum to raise the issue. You're on your own.

4. No exchange of information agreement (tax treaty basis)

The US and Brazil don't have a treaty-based exchange of information, but they do swap financial account data through two channels:

• FATCA IGA (Model 1): Brazil signed a FATCA IGA with the US in 2014. Brazilian financial institutions report US account holders to the Receita Federal, which transmits to the IRS. In reverse, US institutions report Brazilian account holders to the IRS, which transmits to the Receita Federal.
• CRS (Common Reporting Standard): Brazil adopted the OECD's CRS in 2017. The US has not. Brazilian institutions report to 100+ jurisdictions through CRS, but US institutions don't report to Brazil through CRS. Your US bank accounts are visible to the Receita Federal through FATCA, not CRS.

Bottom line: the Receita Federal sees your US financial accounts. The information flow exists. It just operates outside any treaty framework.

5. No foreign tax credit coordination

Treaty countries spell out how foreign tax credits are calculated and which taxes qualify. Without a treaty, Brazil's credit for US taxes paid runs entirely on domestic law (Lei 4.506/64, Article 6). No bilateral coordination on which taxes qualify, how to handle income category mismatches, or what to do with taxes one country imposes but the other doesn't recognize.

Receita Federal worldwide income taxation

Brazil taxes residents on worldwide income. If you earn $8,000/month through a US LLC, you owe Brazilian income tax on that amount whether the money is distributed, sits in the US bank account, or gets reinvested. It's classified as foreign-source rendimentos and taxed at progressive IRPF rates.

IRPF progressive rates (2026)

At $8,000 USD/month (roughly R$40,000 at 5.0 BRL/USD), you're in the 27.5% bracket. After the deduction, the effective rate on R$40,000/month of foreign-source income works out to about 25.3%.

How US LLC income is classified

The Receita Federal classifies income earned through a foreign entity as foreign-source rendimentos tributáveis (taxable earnings). The classification questions that matter:

• Single-member LLC (disregarded for IRS purposes): The IRS treats the income as belonging directly to the owner. The Receita Federal's treatment depends on whether it views the LLC as transparent or as a separate foreign legal person. In practice, Brazilian tax authorities generally look through single-member structures and tax the income as personal foreign-source income.
• Income type: Service revenue, product sales, interest, dividends — each classifies differently on the IRPF return. Service revenue through a US LLC goes under rendimentos do trabalho recebidos do exterior (work income received from abroad).
• Currency conversion: Convert to BRL at the PTAX rate (published by the Banco Central) on the date of receipt or credit.

The Carnê-Leão trap

This is where most Brazilian LLC owners get blindsided.

Carnê-Leão is Brazil's monthly tax payment for foreign-source income. It applies to every month you receive LLC income. Payment is due by the last business day of the following month. If you're expecting to settle everything at annual filing time, you're already behind. By the time the IRPF declaration is due, twelve months of unpaid installments have been accruing interest and penalties independently.

How Carnê-Leão works

1. You receive LLC income in January ($8,000 USD deposited to your Mercury account)
2. Convert to BRL at the PTAX rate on the date of receipt
3. Calculate IRPF tax using the progressive table
4. Pay via DARF code 0190 by the last business day of February
5. Repeat every month

Since 2024, the Receita Federal provides Carnê-Leão Web (through e-CAC) for calculating and generating DARF payment slips.

Late payment consequences

The penalty structure is cumulative. Miss six months and you don't get one penalty — each month's missed payment accrues its own penalty and interest independently. At a 13.25% SELIC rate, interest alone adds about 1.1% per month to each unpaid installment.

The common mistake

I've seen this pattern with founders from several countries: they treat LLC income the way they treat domestic employment income, expecting annual reconciliation. But employment income has tax withheld at source. Foreign-source income doesn't. That's the whole point of Carnê-Leão — there's no employer to withhold for you.

At R$40,000/month through a US LLC, skipping Carnê-Leão for a full year means roughly R$120,000 in unpaid tax. Add maximum penalties (20%) and a year of SELIC interest (~13.25%), and you're looking at about R$160,000. That's R$40,000 in penalties and interest on top of the tax itself.

Foreign tax credit without a treaty

Here's the one piece of good news: Brazil allows a unilateral foreign tax credit under Lei 4.506/64, Article 6, and RIR/2018, Article 1001. You can offset US taxes paid against your Brazilian IRPF liability on the same income. The credit is capped at the lesser of: (a) tax actually paid to the US, or (b) Brazilian tax on the same income. This works whether or not a treaty exists because it's a domestic provision.

How the credit works

1. You earn $100,000 USD through the LLC in a calendar year
2. The IRS taxes this as ECI on Form 1040-NR — assume ~$17,000 in US federal tax
3. The Receita Federal taxes the same income as foreign-source rendimentos — assume ~R$125,000 in IRPF (on R$500,000 at 27.5%)
4. You claim a foreign tax credit on the IRPF return for US tax paid
5. Credit is limited to Brazilian tax on the same income — max credit R$125,000
6. US tax of $17,000 (~R$85,000) is below the Brazilian tax, so the full amount qualifies

Calculation mechanics

This is the clean scenario: US tax is lower than Brazilian tax on the same income, so the full US tax is creditable. The combined rate approximates the higher of the two rates (Brazil's 27.5% marginal), which is how the credit system is supposed to work.

When the credit does not fully offset

It breaks down in several situations:

• US state taxes: If you're in a state with income tax (California at up to 13.3%), the combined US federal + state tax can exceed the Brazilian tax on the same income. The excess is not creditable. It's gone.
• Different income categories: Brazil separates income by type (trabalho, capital, etc.). A US tax credit on service income can't offset Brazilian tax on capital gains from the same LLC.
• Timing mismatches: Carnê-Leão is monthly, US estimated tax is quarterly. The annual IRPF return reconciles payments made on completely different schedules.
• Currency fluctuation: The PTAX rate when you pay US tax may differ from the PTAX rate when you received the income. Small mismatches, but they compound.

Reciprocity requirement

Lei 4.506/64 has a reciprocity clause: the credit only works for taxes paid to countries that give equivalent treatment to Brazilian taxes. The US does allow credits for Brazilian taxes (IRC Section 901), so reciprocity is met. But the Receita Federal can challenge the credit if you can't document the US tax paid — keep your Form 1040-NR, payment receipts, and IRS transcripts.

BACEN CBE reporting

The CBE (Declaração de Capitais Brasileiros no Exterior) is a separate beast, administered by BACEN, not the Receita Federal. If your foreign assets total $100,000 USD or more on the reference dates, you file the CBE. Your LLC membership interest counts. So does the US bank account balance.

Filing thresholds and frequency

The annual CBE deadline is generally April 5 of the following year (for the December 31 reference date).

What counts as foreign assets

Foreign assets for CBE purposes:

• Equity interests in foreign entities — your LLC membership interest
• Foreign bank accounts — your Mercury, Relay, or other US bank balance
• Foreign real estate — rarely relevant for LLC-only founders
• Securities held abroad — stocks, bonds, or other instruments in US brokerage accounts
• Other rights abroad — IP registered in the US, receivables from US clients

LLC valued at $60,000 plus a $50,000 bank balance = $110,000 in foreign assets. You're above the threshold.

Penalties for non-filing

Note that penalties are calculated on total asset value, not tax owed. $200,000 in foreign assets plus a missed CBE filing = potential penalty up to R$250,000 (~$50,000 USD). And this is a BACEN administrative penalty, completely separate from any Receita Federal tax penalties.

IRPF annual declaration

The IRPF annual declaration (Declaração de Ajuste Anual) is due by the last business day of April. For LLC owners, this is the reconciliation point: your Carnê-Leão payments get credited against the annual calculation, and you claim the foreign tax credit for US taxes paid.

Where to report US LLC income

The IRPF declaration has specific schedules for foreign-source income and assets:

Reporting the LLC itself

Under Bens e Direitos, report the LLC membership interest using:

• Grupo 03 — Participações Societárias
• Código 01 or 02 — controlling vs. minority interest
• Discriminação field: LLC name, EIN, state of formation, ownership percentage, acquisition date
• Situação em 31/12: Cost basis in BRL, converted at the PTAX rate on the date of your capital contribution

The US bank account goes separately under Grupo 06, Código 01 (Depósito bancário no exterior), with bank name, account number, country, and balance in BRL at the December 31 PTAX rate.

Form 5472 and Receita Federal: dual reporting

The same transactions that trigger Brazilian reporting also trigger US filing. Form 5472 requires disclosure of all "reportable transactions" between the LLC and its foreign owner. Every capital contribution, distribution, loan, service fee, and payment between you and the LLC shows up on both Form 5472 (IRS) and the IRPF Bens e Direitos schedule (Receita Federal).

Overlapping disclosure

IRS penalty for a missing Form 5472: $25,000 per form, per year. Receita Federal penalties for incomplete IRPF reporting: fines of 75% of the tax due on unreported income, or 150% if they classify it as fraud under Lei 9.430/96, Article 44.

The coordination challenge

The two reporting systems operate independently. The IRS doesn't verify Form 5472 against your IRPF, and the Receita Federal doesn't cross-reference Form 5472. But FATCA means the Receita Federal sees your US bank account balances and income. If what the bank reports doesn't match what you declared on the IRPF, that's a malha fina trigger.

Practical scenarios

Scenario 1: Brazilian SaaS founder ($8,000/month)

A developer in São Paulo runs a B2B SaaS product through a Wyoming LLC. US and international clients pay $8,000/month to the LLC's Mercury account. The founder works from Brazil with no US physical presence.

US obligations:

Brazilian obligations:

Combined annual tax burden (if US taxes ECI):

Scenario 2: Freelancer on Upwork ($3,000/month)

A Brazilian designer in Florianópolis freelances through Upwork ($3,000/month) and invoices other clients through a New Mexico LLC ($3,000/month). Total: $6,000/month ($72,000/year).

The Upwork income may not flow through the LLC. The LLC-sourced income ($36,000/year) has different US tax treatment than the Upwork income ($36,000/year) paid directly to a personal account.

But the Receita Federal doesn't care about that distinction. Both streams are foreign-source rendimentos. Carnê-Leão applies to both. One monthly payment covers all foreign-source income received that month.

Scenario 3: E-commerce ($15,000/month)

A Brazilian entrepreneur sells physical products to US customers through a Delaware LLC with a Shopify store. Revenue: $15,000/month, $9,000 in COGS and operating expenses. Net profit: $6,000/month.

On the US side, this is clearly a US trade or business. The $72,000 net profit is ECI, taxed on Form 1040-NR at graduated rates (~$11,600 federal tax).

On the Brazilian side, the Receita Federal taxes the founder's share of LLC net income. Whether expenses are deductible for Carnê-Leão purposes gets complicated fast. The system accepts certain deductions (pension, dependents, professional expenses in the livro-caixa), but business expenses of a foreign entity don't map cleanly to Brazilian deduction categories.

This is also the highest-burden scenario for reporting. Hundreds of Shopify transactions per month, each potentially relevant to Form 5472 and IRPF reporting.

Frequently asked questions

Does the US-Brazil FATCA IGA substitute for a tax treaty?

No. FATCA is an information-exchange mechanism. It governs reporting of financial account information between the two countries but provides zero relief from double taxation. No reduced withholding, no tie-breaker rules, no mutual agreement procedure. Your US bank account information gets shared with the Receita Federal, but your tax obligations don't change.

Can Carnê-Leão be avoided by not distributing LLC income?

The Receita Federal's position is that the tax obligation arises when income is "available" to you, not when distributed. A single-member LLC where you control distributions and can access funds at any time? The income is available when earned. The Receita Federal has said this explicitly in rulings (Soluções de Consulta): income from a foreign entity you control is taxable when credited or made available, regardless of formal distribution. Leaving money in the LLC's bank account doesn't eliminate the Carnê-Leão obligation.

Is there a minimum threshold for Carnê-Leão?

Carnê-Leão applies to any month where foreign-source income exceeds R$2,259.20 (the first IRPF bracket). Below that, the tax rate is 0% and no payment is due. But you still report it on the annual IRPF declaration. There's no exemption from reporting itself.

What happens if a Brazilian founder has been paying US tax but not filing Carnê-Leão?

You've been accumulating Brazilian tax debt. Each missed month accrues its own penalty (0.33%/day up to 20%) and interest (SELIC + 1%). You can voluntarily regularize through e-CAC by paying the overdue amounts plus penalties and interest. The foreign tax credit for US taxes already paid reduces the net Brazilian liability on the annual IRPF. But the penalties and interest on late Carnê-Leão payments are not reduced by the credit. You owe those regardless.

Do Brazilian founders need both a Brazilian and a US tax advisor?

Two independent tax systems, no treaty coordination. The IRS wants Form 1040-NR, Form 5472, pro forma 1120, potentially Form 8833. The Receita Federal wants Carnê-Leão, IRPF, foreign asset reporting. BACEN wants the CBE. Each requires knowledge of that country's tax code and filing systems. A single advisor who knows both can handle it. A founder relying only on a US CPA or only on a Brazilian contador will have blind spots. The tax residency determination process is a starting point for mapping which rules apply to you.

Key takeaways

• Brazil and the US have no income tax treaty. No reduced withholding, no tie-breaker provisions, no mutual agreement procedure. FATCA covers information exchange only.
• The Receita Federal taxes worldwide income at 7.5% to 27.5%. US LLC income is foreign-source rendimentos tributáveis.
• Carnê-Leão is monthly, due by the last business day of the following month. Late payment: 0.33%/day penalty (up to 20%) plus SELIC interest.
• Brazil's unilateral foreign tax credit (Lei 4.506/64) offsets US taxes against IRPF, capped at the Brazilian tax on the same income. No treaty required.
• BACEN CBE reporting kicks in at $100,000 USD in foreign assets. Your LLC membership interest and US bank balances both count.
• Form 5472 and the IRPF Bens e Direitos schedule require disclosure of the same transactions — capital contributions, distributions, loans, payments.
• Combined effective rate: 21% to 30%, depending on income level, ECI determination, and credit utilization. Can exceed 30% with US state taxes or income category mismatches.

References

• Receita Federal — Carnê-Leão Web
• Lei 4.506/64, Article 6 — Foreign Tax Credit
• Regulamento do Imposto sobre a Renda (RIR/2018)
• BACEN — Declaração de Capitais Brasileiros no Exterior (CBE)
• Lei 9.430/96, Article 44 — Penalties for Unreported Income
• FATCA Intergovernmental Agreement — Brazil-US (2014)
• IRC Section 1441 — Withholding of Tax on Nonresident Aliens
• IRS Form 1040-NR — US Nonresident Alien Income Tax Return
• IRS Form 5472 — Information Return of a 25% Foreign-Owned US Corporation