What Is IRS Form 8813 and When Does a Foreign-Owned Partnership Use It?

IRS Form 8813 is the payment voucher a partnership uses to pay Section 1446 withholding tax to the U.S. Treasury on effectively connected taxable income (ECTI) allocated to foreign partners. It is generally used during the partnership’s tax year when Section 1446 withholding payments are due, rather than as the partnership’s annual information return.

For foreign-owned U.S. partnerships—and U.S. LLCs taxed as partnerships—Form 8813 is an important part of the federal tax compliance process. Understanding when it applies can help foreign founders avoid missed payments, penalties, and confusion between Forms 8813, 8804, and 8805.

What Is Form 8813?

Form 8813 is officially called the Partnership Withholding Tax Payment Voucher (Section 1446). Its purpose is straightforward: the partnership uses it to pay Section 1446 withholding tax to the IRS. The form accompanies each payment of Section 1446 tax made during the partnership's tax year.

Section 1446 generally applies when a partnership has effectively connected taxable income allocable to foreign partners. In that situation, the partnership—not the foreign partner personally—is responsible for making the required withholding payments to the IRS.

This is especially relevant to a U.S. LLC with multiple members if the LLC is classified as a partnership for federal tax purposes and one or more members are foreign persons.

Form 8813 vs. Forms 8804 and 8805

These forms work together, but they have different jobs:

The IRS describes Form 8813 as the payment mechanism, while Form 8804 is the annual reporting form and Form 8805 provides the foreign partner with information needed to claim withholding credit.

When Does a Foreign-Owned Partnership Use Form 8813?

A partnership generally uses Form 8813 when it has ECTI allocable to foreign partners and therefore has a Section 1446 withholding payment to make. Importantly, simply having a foreign owner does not automatically mean Form 8813 is required. The key question is whether the partnership has income that falls within the Section 1446 withholding rules.

For example, consider a U.S. partnership owned 60% by a U.S. founder and 40% by a nonresident founder. If the partnership conducts a U.S. trade or business and generates ECTI allocable to the foreign partner, Section 1446 withholding can apply. The partnership would generally make the required installments using Form 8813. By contrast, having a foreign partner alone does not create a Form 8813 payment obligation if there is no applicable ECTI subject to Section 1446 withholding.

When Are Form 8813 Payments Due?

Section 1446 withholding is generally paid in four installments during the partnership's tax year. The IRS instructions specify the due dates as the 15th day of the 4th, 6th, 9th, and 12th months of the partnership's tax year. For a calendar-year partnership, that generally means payments are due around:

• April 15
• June 15
• September 15
• December 15

The exact calculation of each installment can depend on the partnership's ECTI, the foreign partners' shares, applicable withholding rates, and adjustments permitted under the Section 1446 rules. The partnership generally uses Form 8804-W to calculate its required installment payments.

How Much Does the Partnership Pay?

For 2026, the general Section 1446 withholding rate is:

• 37% for non-corporate foreign partners
• 21% for corporate foreign partners

These are general rates, and special rules can affect the applicable percentage for certain types of income or circumstances. The important point is that Section 1446 withholding is based on the foreign partner's allocable effectively connected taxable income, not simply the amount of cash the partner receives.

That distinction matters for founders because a foreign member can have a Section 1446 withholding obligation even when the partnership does not distribute an equivalent amount of cash.

Does Form 8813 Mean the Foreign Partner Owes That Exact Amount?

No. Section 1446 withholding is generally an advance payment toward the foreign partner's U.S. tax liability, rather than necessarily the partner's final tax bill. The partnership pays the withholding to the IRS on the foreign partner's behalf. The foreign partner can generally use the corresponding Form 8805 to claim the withholding credit on an applicable U.S. income tax return. This is one reason founders should not interpret a 37% withholding payment as automatically meaning their final U.S. tax rate is 37%.

What Happens After Form 8813 Is Filed?

Form 8813 handles the payment during the year, but the compliance process does not end there. At the end of the partnership's tax year:

1. The partnership determines its annual Section 1446 liability.
2. It reports that liability on Form 8804.
3. It generally prepares Form 8805 for applicable foreign partners.
4. The foreign partner can use Form 8805 to claim the appropriate withholding credit on a U.S. tax return.
5. Any remaining amount due to the IRS generally must be paid with the annual filing process. The partnership must also generally notify foreign partners about Section 1446 tax paid on their behalf within the applicable notification period after an installment payment.

What If the Partnership Has Partner-Level Deductions or Losses?

There are circumstances in which a foreign partner may provide Form 8804-C to certify certain deductions or losses that could reduce Section 1446 withholding. A partnership may consider qualifying information from Form 8804-C when calculating its withholding liability, although the partnership is not generally required to accept the certification.

If the partnership relies on such a certificate to reduce its Section 1446 payment, additional documentation requirements can apply to Form 8813 and later reporting. This is an area where professional tax advice can become particularly valuable because incorrectly reducing withholding can expose the partnership to additional tax, penalties, and interest.

Common Mistakes Foreign-Owned Partnerships Make

Assuming every foreign-owned LLC needs Form 8813

Foreign ownership alone isn't the trigger. Section 1446 and ECTI are the important concepts.

Treating Form 8813 as an annual tax return

It isn't. Form 8813 is primarily a payment voucher used for Section 1446 installments.

Confusing Form 8813 with Form 8805

The foreign partner typically needs Form 8805 as documentation of its allocated ECTI and withholding credit. Form 8813 is used by the partnership to make the payment.

Waiting until Form 8804 is due

Section 1446 payments are generally made throughout the year. Waiting for the annual return can create a late-payment problem.

Assuming distributions determine withholding

Section 1446 withholding is tied to ECTI allocable to foreign partners, not simply to distributions made to those partners.

A Practical Checklist for Foreign-Owned Partnerships

Before assuming Form 8813 is required, check:

• Is the entity actually classified as a partnership for U.S. federal tax purposes?
• Does it have a foreign partner?
• Does the partnership have effectively connected income?
• Is ECTI allocable to the foreign partner?
• Has the partnership calculated its Section 1446 withholding obligation?
• Are installment payments required during the tax year?
• Has the partnership properly documented each partner's U.S. or foreign status?
• Will Forms 8804 and 8805 also be required at year-end?

For global founders using a U.S. LLC structure, getting the entity classification right is the starting point. Platforms such as Foundeck, an AI-powered U.S. company formation and management platform for global founders, can help with the broader formation and administrative side, but Section 1446 calculations are tax-compliance matters that may require a qualified U.S. tax professional.

Frequently Asked Questions

Is Form 8813 required for every foreign-owned partnership?

No. Foreign ownership by itself does not automatically create a Form 8813 payment obligation. The partnership generally needs to have Section 1446 withholding tax to pay because of ECTI allocable to foreign partners.

Who files Form 8813?

The partnership uses Form 8813 to pay Section 1446 withholding tax to the IRS. It is not normally a form that the foreign partner files personally.

How often is Form 8813 filed?

It generally accompanies each Section 1446 installment payment. Installments are generally due on the 15th day of the 4th, 6th, 9th, and 12th months of the partnership's tax year.

Is Form 8813 the same as Form 8804?

No. Form 8813 is used to make Section 1446 payments during the year. Form 8804 reports the partnership's annual Section 1446 withholding liability.

What is Form 8805 used for?

Form 8805 reports a foreign partner's ECTI and Section 1446 withholding credit. The foreign partner generally uses it to support a withholding tax credit on an applicable U.S. tax return.

Can a partnership pay Section 1446 tax electronically?

Yes. The IRS states that partnerships may use the Electronic Federal Tax Payment System (EFTPS) for Section 1446 payments. Even when EFTPS is used, the applicable reporting requirements for Forms 8804 and 8805 remain.

Does Section 1446 withholding mean the foreign partner's final tax is 37%?

Not necessarily. The withholding is generally a payment toward the foreign partner's U.S. tax liability. The partner's ultimate tax liability depends on the applicable tax rules and circumstances.

Conclusion

IRS Form 8813 is best understood as the payment form behind Section 1446 withholding. A foreign-owned partnership uses it when it is required to make installment payments of withholding tax on effectively connected taxable income allocated to foreign partners.

The broader compliance chain is easier to remember: Form 8813 pays the tax during the year, Form 8804 reports the annual Section 1446 liability, and Form 8805 documents the foreign partner's share of income and withholding credit.

For international founders operating through a U.S. partnership or multi-member LLC, recognizing that distinction early can prevent one of the most common mistakes in cross-border U.S. tax compliance: treating entity formation, tax classification, income taxation, and withholding as if they were the same thing.