Form 8802 and Form 6166: How to Get US Residency Certification in 2026

Form 8802 is the IRS application a US person files to get Form 6166, the letter that certifies US tax residency so a foreign payer or tax authority will apply treaty rates or a VAT exemption. As of October 2026, the user fee is $105 for individuals and $230 for everyone else, and the IRS asks you to send the application at least 45 days before you need the certificate.

A foreign client, bank or fund that withholds tax at its full domestic rate will usually stop only when it sees that certificate. Form 8802 reports no income and leaves your US tax unchanged. It asks the IRS to confirm, for a specific year and country, that you were a US resident for tax purposes. This guide covers who files, what the new fees mean, how payment and e-submission work, and how long the IRS is taking.

What Form 8802 and Form 6166 Each Do

The two forms work as a request and a response. Form 8802 is the application. Form 6166 is the certificate the IRS sends back, and it is the document you hand to the foreign party.

The IRS describes the certificate this way: Form 6166 is a letter printed on U.S. Department of Treasury stationery certifying residency for income tax purposes. The same page explains that many US treaty partners require the IRS to certify that the person claiming treaty benefits is a US resident, and that use of Form 8802 is mandatory to get that certification.

What the letter certifies is narrow. For an individual or corporation, it confirms US residency for the certification year. For a partnership or other fiscally transparent entity, it confirms that the entity filed its information return when required and that its partners, members or beneficiaries filed as US residents.

There is one use the certificate cannot serve. The Form 8802 instructions state that you cannot use Form 6166 to substantiate that US taxes were paid for purposes of claiming a foreign tax credit. They also say you cannot claim a credit for foreign taxes that a treaty reduced or eliminated, and that a refund of foreign tax obtained with Form 6166 may require an amended return to adjust credits already claimed. If a client has both treaty relief and Form 1116 foreign tax credit claims in play, those two positions need to be reconciled before anything is filed.

Who Uses Form 8802

Anyone who must prove US residency to a treaty country or a VAT authority can apply. Common applicants include:

• US citizens and resident aliens, including green card holders, who receive dividends, interest, royalties, pensions or service fees from abroad.
• US corporations that sell into foreign markets and face withholding on royalties or service income.
• Partnerships, S corporations, grantor trusts and other fiscally transparent entities, which apply under their own EIN while the IRS verifies the US status of the partners, owners or beneficiaries behind them. A disregarded entity is not itself a treaty resident, so the benefit belongs to its US owner.
• Pension plans, IRAs and certain trusts claiming exemptions on foreign investment income.

The foreign payer often asks for the certificate alongside its own claim form. That is the mirror image of what a US payer asks of a foreign recipient, which collects a Form W-8BEN-E from a foreign entity before applying a reduced US rate.

Who is not eligible for Form 6166

The instructions list several situations that block certification for the tax period in question. You are generally not eligible if any of the following applies:

• you did not file a required US return;
• you filed as a nonresident, for example on Form 1040-NR or Form 1120-F;
• you are a dual resident who used a treaty tie-breaker to be treated as a resident of the other country;
• you are a domestic partnership, grantor trust or disregarded LLC with no US partners, beneficiaries or owners;
• you are an exempt organization not organized in the United States.

Some applicants can still qualify with extra documentation. The instructions call out dual residents, green card holders or citizens who filed Form 2555, and bona fide residents of a US territory. A client using the foreign earned income exclusion on Form 2555 should expect the IRS to ask for a statement and supporting evidence before it will certify US residency.

Form 8802 User Fee for 2026

The IRS raised the fee this year. According to the IRS user fee fact sheet, for applications postmarked on or after Oct. 1, 2026, the individual fee increased from $85 to $105 per Form 8802 and the non-individual fee increased from $185 to $230 per Form 8802. Applications postmarked before that date are processed at the old amounts.

The fee is charged per application and does not depend on how many certificates you request. One Form 8802 can list several countries and several tax years for the same fee, which is why the IRS encourages applicants to put all their Form 6166 requests on a single form. User fees are generally nonrefundable except for overpayments caused by a mathematical error or mistake.

Worked example: one application or three

A US partnership expects to need certificates for France, Germany and Japan for 2027. Filing one Form 8802 that lists all three countries costs $230. Filing three separate applications, one per country as each foreign payer asks, costs 3 × $230 = $690.

How to Pay and Submit Form 8802

Payment and submission are two separate steps.

Step 1: pay on Pay.gov. Search for "IRS Certs" on Pay.gov and follow the prompts. Since September 29, 2024, applicants must upload a copy of the completed Form 8802 when paying. The instructions say this upload is only for payment validation. All applications in one payment must be combined into one PDF under 15MB.

Step 2: enter the confirmation number. Pay.gov issues an e-payment confirmation number. Enter it on page 1 of Form 8802. The IRS will not process a Form 8802 that lacks this number.

Step 3: send the signed application. The IRS states that applications uploaded to Pay.gov will not be processed, so the complete application still has to reach the US Residency Certification unit by mail, private delivery service or fax. The instructions give these channels:

• Mail: Department of the Treasury, Internal Revenue Service, Philadelphia, PA 19255-0625.
• Private delivery service: Internal Revenue Service, 2970 Market Street, BLN# 3-E08.123, Philadelphia, PA 19104-5016.
• Fax: up to 10 Forms 8802 and a maximum of 100 pages to 877-824-9110 (toll free within the United States) or 304-707-9792, with a cover sheet stating the page count.

Form 8802 e-submission for individuals

There is now one fully electronic route. The About Form 8802 page states that Digital Mobile Adaptive Forms became available for Form 8802 effective Sept. 28, 2025, and that it is currently only available for individual applications. The IRS mobile-friendly forms page explains that after filling in the form you can submit it online or download a copy for mailing, and that an IRS Online Account is required for forms that need signatures. Corporations, partnerships, trusts and other entities still use the PDF form with Pay.gov and mail or fax.

Completing the Form: Lines That Cause Rejections

The IRS matches the name and taxpayer identification number on the application to its records, so details have to agree with the return on file.

• Applicant type (line 4). Check the box that matches the return actually filed. A partnership, trust, or LLC that has made an entity classification election on Form 8832 should apply consistently with that classification.
• Calendar year and tax period (lines 7 and 8). Enter the year the foreign country needs certified. Fiscal-year filers follow special rules.
• Purpose (line 9). Indicate income tax treaty or VAT. For a VAT request, enter the NAICS code, because Form 6166 will only certify a NAICS code that matches the one on the application.
• Penalties of perjury statement (line 10). Required for a current-year request or for a year whose return is not yet due. For VAT, it must also state that the business activity has not changed since the last return was filed.
• Certifications per country (line 11). Enter the number of Forms 6166 requested for each country. If you need letters for more than one year for the same country, add them together and attach a statement showing the country, year and number of certifications per year.

If the return for the certification year has not yet posted, the IRS will ask for a signed copy of the most recent return. Applicants with Form 1116 claims above $5,000, or credits on foreign earned income, must submit extra evidence of US residency.

The 3-year procedure

Estates, employee benefit plans and trusts, and exempt organizations can use a 3-year procedure covering the current year and the following two. In year 1 they file a penalties of perjury statement that they are a US resident and will remain so through that period. In years 2 and 3 they file a new Form 8802 with a copy of the year 1 application attached, as long as nothing material has changed. A user fee applies to each annual application.

Form 8802 Processing Times

The instructions tell applicants to mail the application, with full payment, at least 45 days before the date they need to submit Form 6166. The IRS says it will contact you after 30 days if there will be a delay. Questions go to 267-941-1000 (not toll free), selecting the US residency option.

Actual queues can be longer. The IRS processing status page lists the receipt month it is working on for Form 8802. As of October 2026, it showed the IRS processing Forms 8802 received in September 2026. Check that page before promising a date to a foreign payer.

There is also an earliest date. A current-year request postmarked before December 1 of the prior year is returned unprocessed. For a 2027 certificate, that means a postmark on or after December 1, 2026.

Treaty Uses: Foreign Withholding Relief and VAT

Foreign withholding relief. The instructions explain that some foreign countries withhold at the treaty-reduced rate at the time of payment once they have proof of US residency, while others withhold at their statutory rate first and refund the excess after receiving it. Form 6166 is that proof. The instructions advise examining the specific treaty to see whether any credit, exemption or reduced rate applies, and they explain that a foreign claim form can be sent with Form 8802, which the IRS will date stamp or process only for countries it has an agreement with. Treaty-based positions taken on the US return may also need disclosure, which is covered in our guide to Form 8833 treaty-based return positions.

Treaty status changes, so check the instructions each year. The October 2026 instructions note the partial suspension of the US treaty with Russia from August 16, 2024, the termination of the 1979 Hungary convention, and the US-Chile treaty, which took effect for withholding taxes on amounts paid or accrued on or after February 1, 2024.

VAT exemptions. A US business that incurs VAT abroad, for example on conference fees or services, may be able to claim an exemption or refund if it can prove US tax residency. The instructions say Form 6166 can be used as proof of US tax residency for this purpose. They also say the United States can certify only to matters about the applicant's US federal income tax status, and not that the applicant meets the foreign country's other requirements for a VAT exemption. For background on how VAT differs from US sales tax, see our explainer on US sales tax vs. VAT.

How CPA Firms Manage Form 8802 for Clients

For a firm with clients earning income across borders, Form 8802 is a small form tied to real cash. The work involves confirming which entity or owner is the right applicant, checking that the certification year matches a posted return, choosing between the mobile-friendly route and the PDF route, and logging each application so the certificate arrives before the foreign payer's deadline. Firms that build this into their wider international tax practice for CPA firms often keep a calendar of which clients need annual certificates, so current-year requests can go out soon after the December 1 opening date.

The same clients often have related compliance, such as Form 1042-S reporting for withholding agents and payees on payments flowing the other way.

This article is general information and not legal or tax advice. Check the current Form 8802 instructions or a qualified adviser for a specific situation.

Frequently Asked Questions

What is Form 8802 used for? Form 8802 is the application for United States residency certification. You file it to get Form 6166, which proves US tax residency so a foreign country will apply income tax treaty benefits or a VAT exemption.

How much is the Form 8802 user fee in 2026? For applications postmarked on or after October 1, 2026, the fee is $105 for individuals and $230 for non-individual applicants. One fee covers every country and year listed on the same application.

Can I file Form 8802 online? Individuals can complete and submit Form 8802 through the IRS mobile-friendly forms system, which requires an IRS Online Account for signature. Businesses pay on Pay.gov and then mail or fax the application, because the Pay.gov upload is only used to validate payment.

How long does Form 8802 take to process? The IRS asks applicants to file at least 45 days before they need the certificate and says it will make contact after 30 days if there is a delay. As of October 2026, its processing status page showed it was working on applications received in September 2026.

Can Form 6166 be used for a foreign tax credit? No. The IRS states that Form 6166 cannot be used to substantiate that US taxes were paid for a foreign tax credit claim. It certifies residency only.

Next Step

Madras Accountancy supports US CPA firms with tax preparation and compliance work for clients who have cross-border income, including residency certification requests and the returns they depend on. To discuss how that support could fit your firm, contact our team.