Form W-8IMY: Complete guide for foreign intermediaries and flow-through entities (2026)

Form W-8IMY is the IRS certificate that foreign intermediaries, flow-through entities, and certain US branches use to document their status and pass along beneficial owner information to withholding agents.

If your entity receives US-source income on behalf of others, this is the form that tells the withholding agent who stands behind the payment – and at what rate to withhold.

Unlike a W-8BEN, which a single beneficial owner files for themselves, Form W-8IMY is filed by entities acting as go-betweens.

It is part of the W-8 series covering Chapter 3 and Chapter 4 withholding obligations. Form W-8IMY generally must be associated with a withholding statement and supporting documentation when the intermediary or flow-through entity receives payments on behalf of beneficial owners. A withholding statement is not required in every case, including certain situations where the form is provided only to establish Chapter 4 or IGA status.

This guide covers what W-8IMY is, who must file it, and how to complete the tax form W-8IMY step by step – including the withholding statement, FATCA certifications, and common filing mistakes.

What is Form W-8IMY? A plain-English overview

IRS Form W-8IMY – formally the “Certificate of Foreign Intermediary, Foreign Flow-Through Entity, or Certain US Branches for United States Tax Withholding and Reporting” – serves as an intermediary withholding certificate.

The form serves as a foreign intermediary certification – it establishes the entity’s role in the payment chain without claiming a reduced withholding rate on its own.

Instead, it tells the withholding agent that the entity submitting it is acting as an intermediary or pass-through, and that the underlying beneficial owners are documented separately.

The W-8IMY purpose is to establish a chain of documentation between the person making a payment and the person who ultimately owns the income.

A foreign bank receiving US dividend payments on behalf of 200 account holders, for example, submits a single Form W-8IMY along with a withholding statement. That statement breaks down each account holder’s share and the applicable withholding rate.

This makes the W-8IMY form distinct from every other form in the W-8 series.

Where a W-8BEN or W-8BEN-E establishes the filer’s own tax status, W-8IMY establishes the filer’s role as a conduit. The focus shifts to the documentation attached to it.

Who must file Form W-8IMY?

The following entity types are required to submit IRS Form W-8IMY when receiving US-source income on behalf of others:

• Qualified intermediaries that have entered a withholding agreement with the IRS
• Nonqualified intermediaries that have not entered such an agreement
• Withholding foreign partnerships and withholding foreign trusts that have assumed primary withholding responsibility
• Non-withholding foreign partnerships and non-withholding foreign trusts passing income through to partners or beneficiaries
• Certain US branches of foreign banks or insurance companies acting as intermediaries
• Qualified derivatives dealers and qualified securities lenders

A foreign entity acting as an intermediary – not the ultimate beneficial owner – must use Form W-8IMY rather than Form W-8BEN.

Individual foreign persons who are the actual beneficial owners should use W-8BEN instead.

A flow-through entity is any entity that does not itself owe tax on the income it receives but passes that income through to its owners, partners, or beneficiaries. Foreign partnerships and foreign trusts are the most common examples.

W-8IMY vs other W-8 forms: key differences

The W-8 series includes five forms, each serving a different filer type. A W-8 series forms comparison helps clarify when W-8IMY applies:

 

The key distinction in a W-8BEN vs W-8IMY comparison: W-8BEN is filed by the person who owns the income. W-8IMY is filed by the entity that sits between the withholding agent and the beneficial owner.

W-8IMY never claims a reduced rate on its own. It relies on the underlying W-8BEN, W-8BEN-E, or other documentation attached to the withholding statement.

These are all non-US persons tax forms used to certify foreign status for Chapter 3 and Chapter 4 purposes.

Purpose of Form W-8IMY: Chapter 3 and Chapter 4 withholding

Form W-8IMY serves a dual purpose tied to two separate withholding regimes in the Internal Revenue Code.

• Chapter 3 withholding covers sections 1441 through 1443 and requires withholding agents to withhold 30% on US-source income – dividends, interest, royalties, and certain other payments – paid to foreign persons unless a valid withholding certificate establishes eligibility for a reduced rate.
• Chapter 4 withholding covers sections 1471 through 1474 and implements FATCA. It requires 30% withholding on withholdable payments made to non-participating foreign financial institutions and certain non-financial foreign entities that fail to document their beneficial owners.

Form W-8IMY allows a withholding agent to treat payments made to a foreign intermediary as properly documented, satisfying both Chapter 3 and Chapter 4 obligations. Without a valid W-8IMY on file, the withholding agent must apply the full 30% statutory withholding rate to the entire payment.

Chapter 3 withholding and Chapter 4 withholding operate independently. An entity can be compliant under one chapter and non-compliant under the other, resulting in different withholding rates on different portions of the same payment.

The Form W-8IMY withholding statement must allocate income under both regimes.

FBAR filing obligations are separate from Form W-8IMY. FBAR is reported on FinCEN Form 114, not through the Chapter 3 or Chapter 4 withholding system.

The withholding statement: The critical attachment to W-8IMY

A Form W-8IMY withholding statement is the document that gives the form its practical value. Without a complete withholding statement attached, the withholding agent cannot apply reduced treaty rates and must withhold at the full 30% statutory rate on every payment.

The four core elements a withholding statement must include:

• Allocation of each payment to each beneficial owner or payee pool
• The withholding rate applicable to each allocation
• The Chapter 4 FATCA status of each payee
• References to the underlying W-8BEN, W-8BEN-E, or other documentation on file

The withholding statement is not a standardized IRS form. Intermediaries may use their own template as long as it contains all required elements and includes penalties-of-perjury language applicable to the certificate.

Payee allocation is the core function of the withholding statement. Every dollar must be accounted for – the statement must allocate 100% of each payment across beneficial owners, with the correct withholding rate tied to each allocation based on the underlying documentation.

Many qualified intermediaries use a standardized internal template reviewed by their compliance team annually.

If you are building one from scratch, the withholding statement template section below covers the required elements.

Qualified intermediary (QI) vs nonqualified intermediary (NQI): What the distinction means for W-8IMY

A qualified intermediary is an eligible person that has entered into a QI agreement with the IRS. Depending on its elections and the payment involved, a QI may or may not assume primary withholding responsibility. An NQI – a nonqualified intermediary – has not entered such an agreement and must pass all beneficial owner documentation upstream to the withholding agent.

This distinction shapes nearly everything about how Form W-8IMY operates in practice.

QI advantages:

A QI can pool beneficial owners into withholding rate pools on its withholding statement rather than disclosing each individual payee. It may also elect to assume primary Form 1099 reporting and backup withholding responsibility.

This makes the QI structure attractive to foreign banks and investment firms that want to protect client confidentiality while maintaining US tax compliance.

NQI obligations:

An NQI must provide the withholding agent with a complete withholding statement that identifies every payee individually, along with each payee’s underlying W-8 or W-9 documentation. The withholding agent – not the NQI – then applies the correct withholding rate based on that documentation.

A common TFX client scenario: a foreign bank acting as a QI for a pool of non-US investors receiving US dividends.

The bank submits Form W-8IMY with a withholding statement that groups payees by treaty country and withholding rate – for example, 15% for UK treaty residents, 30% for non-treaty residents. Individual account holder names are not disclosed to the US payer.

A QI may elect to assume primary Form 1099 reporting. An NQI cannot – all upstream documentation must pass through to the withholding agent.

Withholding foreign partnerships and withholding foreign trusts

A withholding foreign partnership or withholding foreign trust is a foreign entity that has entered into an agreement with the IRS to assume primary Chapter 3 and Chapter 4 withholding responsibility for all payments made to its partners, beneficiaries, or owners.

This is a voluntary election.

A foreign partnership or foreign trust that has not entered a withholding agreement is classified as non-withholding.

It must instead pass documentation through to the withholding agent via a withholding statement.

The difference matters for compliance:

• A withholding foreign partnership assumes the upstream withholding agent’s obligation and becomes responsible for the correct withholding amount on distributions to each partner
• A non-withholding foreign partnership must attach its partners’ individual W-8BEN or W-8BEN-E forms to its own Form W-8IMY, and the withholding agent applies the rates

Foreign grantor trusts have an additional layer of complexity.

If the grantor is a US person, the trust’s income may be reportable on the grantor’s individual return regardless of the trust’s withholding status.

Non-withholding foreign partnerships and non-withholding foreign trusts do not assume the withholding obligation themselves – they pass documentation through to the withholding agent.

FATCA and Form W-8IMY: Chapter 4 status certifications

Part I of Form W-8IMY requires the intermediary to certify its Chapter 4 FATCA status – for example, as a participating foreign financial institution, registered deemed-compliant FFI, or exempt beneficial owner.

A foreign financial institution that has registered with the IRS and received a Global Intermediary Identification Number must include that GIIN on Form W-8IMY.

An FFI that fails to certify a valid Chapter 4 status may cause the withholding agent to apply FATCA withholding on withholdable payments.

FFIs operating under an intergovernmental agreement report account information to their local tax authority rather than directly to the IRS. The IGA country and the FFI’s FATCA status must be indicated on the form.

FATCA reporting requirements apply to every entity in the chain. A withholding agent receiving a Form W-8IMY from a participating FFI must verify the GIIN against the IRS FFI list. A GIIN that does not match – or a missing GIIN – triggers 30% FATCA and W-8IMY withholding on the payment.

FFIs operating under a Model 1 IGA report to their local tax authority, which exchanges information with the IRS automatically. The FFI’s Chapter 4 status on Form W-8IMY should reflect its IGA classification, not its direct relationship with the IRS.

How to complete Form W-8IMY: Part-by-part instructions

The Form W-8IMY instructions call for 29 parts, but most filers complete only the parts relevant to their entity type. Here is a walkthrough of the key sections.

Part I: Identification of entity

Enter the intermediary’s legal name, country of incorporation, address, and taxpayer identification numbers. Enter the GIIN on line 9 when the filer’s Chapter 4 status requires one, including applicable participating FFIs, reporting Model 1 or Model 2 FFIs, and registered deemed-compliant FFIs.

Part II: Disregarded entity or branch receiving payment

Complete this part only if a disregarded entity with a GIIN, or a branch of an FFI in a country other than the FFI’s country of residence, is receiving the payment. See the current Form W-8IMY (Rev. October 2021).

Part IV: NQI certifications

Complete this part if your entity is a nonqualified intermediary. This part confirms that the entity will provide a complete withholding statement and underlying documentation.

Part VIII: flow-through entity certifications

Complete this part if your entity is a non-withholding foreign partnership, non-withholding foreign simple trust, or non-withholding foreign grantor trust passing income through to its owners. See the current Form W-8IMY (Rev. October 2021).

Remaining parts and signature

Parts V through XXVIII cover specific entity certifications: territory financial institutions (Part V), excepted NFFEs (Parts XXI through XXV), and the FATCA Chapter 4 status certifications (Parts IX through XXVIII). Complete only the part that matches your entity’s classification.

Every W-8IMY filer must complete Part XXIX – the certification and signature block. The form must be signed by an authorized representative of the intermediary, not by the beneficial owners whose income is being allocated.

The IRS does not prescribe a specific withholding statement template.

Intermediaries may design their own, provided it contains all required allocation and status information. The withholding statement template section below covers the required elements.

A common error is having a beneficial owner sign the form rather than an authorized representative of the intermediary. Only the intermediary’s authorized officer or agent may sign Part XXIX – signatures by underlying beneficial owners do not satisfy this requirement.

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W-8IMY expiration: How long is the form valid?

Unlike other W-8 forms in the series, a Form W-8IMY does not expire on a fixed three-year schedule. The IRS requester instructions state that W-8IMY is valid indefinitely – it remains in effect until a change in circumstances makes the information on the form incorrect.

A change in circumstances includes any event that affects the intermediary’s status – for example, a change in QI agreement status or FATCA classification. When a change occurs, the intermediary must submit a new Form W-8IMY within 30 days.

However, the underlying withholding certificates attached to the W-8IMY withholding statement – the individual W-8BEN, W-8BEN-E, and W-8ECI forms provided by beneficial owners – do expire after three calendar years. A W-8BEN signed on March 15, 2025, for example, expires on December 31, 2028.

This creates a tracking obligation. Withholding agents should maintain a system for W-8IMY expiration dates – not for the W-8IMY itself, but for every underlying certificate referenced in the withholding statement.

When underlying certificates lapse, the withholding agent must apply full statutory withholding rates to those payees until new documentation is obtained.

Withholding agents should conduct an annual review of all W-8 documentation on file to catch expiring underlying certificates before they lapse. A lapsed certificate does not invalidate the entire W-8IMY – only the allocation to the affected payee.

Beneficial owner documentation: What must accompany W-8IMY

The following documentation types must be collected and maintained by the intermediary and referenced in the withholding statement:

• W-8BEN for individual foreign beneficial owners
• W-8BEN-E for foreign entity beneficial owners
• W-9 for US persons receiving income through the intermediary
• Documentary evidence for treaty claims, such as certificates of residence

The documentation required with Form W-8IMY depends on the intermediary’s status. NQIs and nonwithholding flow-through entities generally transmit underlying documentation as required, while QIs generally maintain their customers’ documentation under the QI agreement and WPs and WTs assume specified withholding and reporting responsibilities themselves.

For payees in treaty countries, the intermediary must hold a valid W-8BEN or W-8BEN-E claiming the specific treaty article and rate. For non-treaty payees, the withholding agent applies the default 30% rate.

The substantial presence test determines whether a foreign person qualifies as a resident or nonresident alien. This classification affects which W-8 form applies.

Documentary evidence standards differ for payees in treaty countries vs. non-treaty countries. Treaty-country payees generally need a certificate of residence from their tax authority. Non-treaty payees need only a valid W-8BEN.

Treaty benefits and Form W-8IMY: Claiming reduced withholding rates

Treaty-reduced withholding rates on US-source income can only be passed through to beneficial owners if the intermediary’s withholding statement properly allocates each payment to those who qualify for treaty benefits.

Each allocation must tie to a documented beneficial owner who qualifies for treaty benefits under the applicable US tax treaty.

An NQI cannot claim treaty benefits on its own behalf using Form W-8IMY. Treaty claims must be supported by a valid beneficial-owner withholding certificate that establishes eligibility for the reduced rate. The specific treaty article, rate, and additional representations are required when the applicable Form W-8 instructions call for them; they are not required on every treaty claim.

A QI has more flexibility. If the bank is a QI that has assumed the relevant primary withholding responsibility, it applies withholding under its QI agreement. A QI that has not assumed that responsibility instead provides the withholding agent with the required withholding-rate pool information.

However, the QI remains liable for under-withholding if the treaty benefits claimed are incorrect.

The Limitation on Benefits clause in many US treaties adds an additional layer of documentation. US source income flowing through a QI to a treaty-country entity may still face full withholding if the entity cannot demonstrate that it meets the LOB requirements.

Treaty claims on US-source income through a QI are subject to IRS audit. The QI must maintain documentation supporting every reduced-rate allocation for at least as long as the applicable statute of limitations remains open.

US-source income subject to W-8IMY documentation

Common categories of US-source income that trigger W-8IMY documentation requirements include:

• Dividends from US corporations
• Interest on US bank deposits and bonds
• Royalties for use of US intellectual property
• Rents from US real property
• Certain gains from US securities

Any payment of US-source fixed or determinable annual or periodical income to a foreign intermediary requires a valid Form W-8IMY before the agent can apply a reduced withholding rate.

Income that is effectively connected with a US trade or business follows different rules and may require Form W-8ECI instead.

Certain types of US-source income have specific withholding rules. Portfolio interest, for example, may be exempt from withholding under section 871(h) – but the intermediary must still provide proper documentation through Form W-8IMY to establish the exemption.

Withholding agent responsibilities when receiving Form W-8IMY

A withholding agent receiving a Form W-8IMY has five core obligations:

1. Verify the form is complete and not expired
2. Confirm the withholding statement allocates 100% of each payment
3. Apply the correct withholding rate to each allocation based on the underlying documentation
4. Retain the form and all associated documentation for the applicable record-retention period
5. Report payments on the appropriate information return – for example, Form 1042-S

Withholding agent responsibilities extend beyond simply collecting the form.

A withholding agent that relies in good faith on a facially valid W-8IMY and withholding statement is generally not liable for under-withholding caused by incorrect information provided by the intermediary.

However, the agent has a duty to know. If information on the W-8IMY is inconsistent with other records the agent holds – for example, a US address on a payee’s W-8BEN – the agent cannot rely on the form. The agent must request corrected documentation before applying any reduced rate.

Withholding agents should request a new W-8IMY any time they have reason to know that information on the existing form is incorrect or unreliable.

A lapse in QI status converts the entity to an NQI, which requires a different set of documentation and withholding procedures. Request a new Form W-8IMY any time the intermediary’s QI agreement status changes.

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Penalties for incorrect or missing W-8IMY documentation

Failure to obtain or maintain valid W-8IMY documentation can expose withholding agents to liability for under-withheld tax, plus interest and penalties.

A withholding agent that fails to withhold the correct amount because it lacked a valid W-8IMY may be held personally liable for the full amount of tax that should have been withheld, plus applicable interest.

Intermediaries who provide false certifications on Form W-8IMY face penalties under IRC Section 7206 for fraudulent statements and potential criminal liability.

For information return penalties, IRC Sections 6721 and 6722 apply.

A withholding agent that files an incorrect Form 1042-S because of inaccurate W-8IMY information faces penalties of up to $340 per form for tax year 2025 returns, due in 2026.

The penalty increases to $680 per form if the IRS determines intentional disregard.

Where a withholding agent collects withholding tax but fails to remit it to the IRS, the trust fund recovery penalty under IRC Section 6672 may apply, imposing personal liability on the responsible individuals.

Penalties apply to both the withholding agent and the intermediary. The withholding agent is responsible for correct withholding; the intermediary is responsible for accurate certifications and timely updates when circumstances change.

Form W-8IMY for foreign financial institutions under FATCA

Foreign financial institutions – including foreign banks, foreign investment funds, and certain foreign insurance companies – must use Form W-8IMY to certify their FATCA status when acting as intermediaries for US-source payments.

An FFI that has registered with the IRS and received a GIIN must include that GIIN on Form W-8IMY. The withholding agent verifies the GIIN against the published IRS FFI list before accepting the form.

A participating FFI certifies that it has agreed to report account information on US account holders and withhold on payments to recalcitrant accounts.

A registered deemed-compliant FFI certifies that it meets the requirements of a specific deemed-compliant category.

Examples include a local bank with a limited customer base or a retirement fund.

FFIs operating under a Model 1 IGA report account information to their local tax authority under FATCA and CRS reporting requirements. The local authority then exchanges the information with the IRS.

The Chapter 4 status certification on Form W-8IMY must reflect the FFI’s classification under the applicable IGA.

An FFI operating under a Model 1 IGA should select the “reporting Model 1 FFI” Chapter 4 status on Form W-8IMY and enter its IGA country. Selecting the wrong status can trigger unnecessary withholding.

How W-8IMY interacts with Form 1042-S reporting

Withholding agents use the information on Form W-8IMY and its accompanying withholding statement to complete Form 1042-S, which must be filed for each beneficial owner or payee pool.

The allocations on the W-8IMY withholding statement directly determine how many Form 1042-S returns the withholding agent must issue and at what withholding rates.

A QI that has assumed primary Form 1042-S reporting responsibility will issue 1042-S forms directly to its account holders. An NQI passes that reporting obligation upstream to the withholding agent.

For partnership withholding, additional forms come into play.

A withholding foreign partnership that submits Form W-8IMY assumes primary Chapter 3 and Chapter 4 withholding responsibility and issues 1042-S forms to its partners.

A non-withholding foreign partnership passes the obligation to the payer, who issues the 1042-S forms based on the partnership’s withholding statement.

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Common mistakes when filing Form W-8IMY

The five most common errors when filing Form W-8IMY:

1. Submitting W-8IMY without a withholding statement. This is the single most common error. Without a complete withholding statement, the withholding agent must apply full 30% statutory withholding to the entire payment.
2. Failing to allocate 100% of each payment. The withholding statement must account for every dollar. An allocation that covers only 80% of a payment forces 30% withholding on the remaining 20%.
3. Using an expired underlying W-8 form. The W-8IMY itself does not expire on a fixed schedule, but the W-8BEN and W-8BEN-E forms attached to the withholding statement do – after three calendar years.
4. Omitting the GIIN for FFIs. A participating FFI or registered deemed-compliant FFI must include its GIIN. A missing GIIN triggers FATCA withholding.
5. Claiming treaty benefits at the intermediary level. Treaty benefits apply to beneficial owners, not to the intermediary itself. A QI can apply reduced rates on behalf of documented beneficial owners, but the W-8IMY form itself does not establish treaty eligibility.

Intermediaries should conduct an annual review of all W-8 documentation on file to catch expiring forms before they lapse.

The single most common W-8IMY error is submitting the form without a complete withholding statement. This forces the withholding agent to apply full statutory withholding rates to the entire payment.

W-8IMY withholding statement template: What to include

The IRS does not prescribe a specific W-8IMY withholding statement template, but every compliant statement must include the following elements:

• Intermediary name and EIN/GIIN – identifying the entity submitting the W-8IMY
• Date of the payment and payment description
• Allocation amount – percentage or dollar amount per beneficial owner
• Chapter 3 withholding rate per allocation
• Chapter 4 FATCA status per allocation
• Reference to the underlying W-8 or documentary evidence on file

The statement must also contain penalties-of-perjury language that applies to the entire withholding certificate.

Intermediaries may design their own template, provided it contains all required allocation and status information. Many QIs use a standardized internal template reviewed by their compliance team annually.

Beneficial owner documentation referenced in the withholding statement must be on file and available for inspection. The withholding agent is entitled to request copies of the underlying W-8 forms at any time.

Keep the withholding statement concise – one row per payee is the clearest format.

Review the template against current IRS requirements annually. FATCA status categories and withholding rate pools change as the regulations evolve.

Intermediaries should also confirm that the penalties-of-perjury language on the withholding statement matches the current IRS-required wording. Outdated language can invalidate an otherwise complete statement.

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