How to Write a Visa Sponsorship Letter: Invitation, I-134, and I-864

Writing a visa sponsorship letter starts with knowing which document you actually need, because “sponsorship letter” covers three very different things. If you are inviting someone for a short visit, you write an informal invitation letter yourself. If you are supporting a fiancé(e), student, or exchange visitor, you complete Form I-134. If you are sponsoring someone for a green card, a letter alone will not do the job — you must file Form I-864, a legally enforceable contract with the federal government.

Which Document You Actually Need

Match the document to the visa before you write a word.

For a B-1 (business) or B-2 (tourist) visa, a personal invitation letter is optional. The State Department states that a letter of invitation or affidavit of support is not required for a visitor visa and is not among the factors used to approve or deny it.¹ A well-written letter can still help at the interview, especially if the applicant’s own finances are modest.

For other temporary visas, including the K-1 fiancé(e) visa and many F-1 and J-1 cases, USCIS uses Form I-134, Declaration of Financial Support.² It is signed under penalty of perjury but is not enforceable as a contract, and the obligation effectively ends when the visitor departs or their authorized stay expires.

For most family-based immigrant visas and some employment-based green cards, Form I-864, Affidavit of Support, is mandatory.³ A personal letter, no matter how detailed, will not satisfy the requirement.

Writing an Invitation Letter for a Visitor Visa

This is the only situation where you actually sit down and draft a letter. Keep it to one page and write in plain, straightforward language. Address it to the specific consular officer who will handle the case, for example “Dear Visa Officer at the U.S. Embassy in Manila,” rather than a generic “To Whom It May Concern.”

What to Include

The letter should give a consular officer enough to understand who you are, who is coming, and how the visit will work.

Your identifying information: full name, address, phone number, email, and immigration status (citizen, permanent resident, visa holder).
The applicant’s information: full name, date of birth, address in their home country, and their relationship to you.
Purpose and dates of the visit: why the applicant is coming (family event, tourism, business meeting) and when they plan to arrive and depart.
Accommodation details: where the applicant will stay, whether with you or at a hotel, and who is paying for it.
Financial commitment: a clear statement of which expenses you will cover, such as airfare, housing, meals, or all costs during the stay.

Format and Signature

Use a standard business-letter format. Put the date and your contact information at the top. Organize the body into short paragraphs: one introducing yourself and your status, one describing the applicant and your relationship, one covering the purpose and dates, and one detailing the financial support you will provide.

Close with “Sincerely,” your printed name, and a handwritten signature. An unsigned letter looks careless. Double-check that your phone number and email are correct, because the consulate may contact you to verify what you have written.

Skip the legal jargon. You are not drafting a contract. If you are a U.S. citizen inviting your mother for a two-week visit and covering all her expenses, say exactly that.

Documents to Attach

Give the letter and its attachments to the applicant, who brings them to the interview. Do not send anything separately to the embassy. Include:

A copy of your U.S. passport, naturalization certificate, or green card to prove your status.
A recent bank statement showing you can cover the visit.
If the applicant will stay in your home, a utility bill or lease showing your address.
Evidence of your relationship, such as photos together or previous correspondence, if useful.

Filing Form I-134 for a Temporary Visa

For a K-1, F-1, J-1, or similar temporary visa where a consular officer has raised public-charge concerns, you do not write a free-form letter. You complete Form I-134 on the USCIS website and provide it to the applicant along with proof of income and identity.² The form itself collects the information a personal letter would otherwise cover.

Filing Form I-864 for a Green Card

The I-864 is a form, not a letter, and it comes with real financial obligations. To sponsor, you must be a U.S. citizen or lawful permanent resident, at least 18 years old, and domiciled in the United States.⁴ In family cases, the sponsor is the relative who filed the immigrant petition. Employers and friends cannot file an I-864 unless they act as a joint sponsor.³

The Income Threshold

Your household income must reach at least 125 percent of the federal poverty guidelines for your household size. Active-duty military members sponsoring a spouse or child need only 100 percent.⁵ Household size includes you, your dependents, anyone you have previously sponsored, and the intending immigrant.

For 2026, the 125 percent thresholds in the 48 contiguous states start at $24,650 for a household of two, $31,075 for three, and $37,500 for four, rising by $6,425 for each additional person. Alaska and Hawaii use higher figures.⁵

Using Assets or a Joint Sponsor

If your income falls short, assets that can be converted to cash within a year can close the gap, but they count only at a fraction of their value. When sponsoring a spouse or minor child as a U.S. citizen, your assets must equal at least three times the shortfall. For every other relationship, the multiplier is five.⁶ Bank accounts, stocks, and real estate equity qualify; a home requires a recent licensed appraisal and documentation of any mortgage.

If assets still are not enough, a joint sponsor can file their own I-864. A joint sponsor must independently meet the income threshold for everyone they are sponsoring without combining resources with you, must be a citizen or permanent resident at least 18 years old and domiciled in the U.S., and need not be related to anyone in the case. No more than two joint sponsors are allowed per case.⁶

Supporting Documents

The I-864 requires either an IRS tax transcript or a photocopy of your most recent federal tax return. If you submit a photocopy, include every W-2 and 1099 filed with it. Self-employed sponsors should include Schedule C, D, E, or F as applicable. You may submit up to three years of returns if the most recent year does not reflect your full earning capacity.⁶

Add a recent employer letter showing salary and tenure, pay stubs from the last six months, and documentation of any other income such as alimony, dividends, or rental income. If assets are part of your case, include proof of ownership, current value, and any liens. A copy of your passport, naturalization certificate, or green card proves your identity and status.

What Signing an I-864 Legally Commits You To

Sponsors often miss how far the I-864 reaches. It is a binding contract with the federal government, not paperwork that expires with the visa.

By signing, you promise to maintain the immigrant at an income of at least 125 percent of the federal poverty line.⁴ If the immigrant receives means-tested public benefits such as Medicaid, food assistance, or cash welfare, the agency that provided them can demand full reimbursement. The obligation is enforceable by the immigrant, the federal government, any state government, and any benefit-granting agency, in federal or state court.³

Only a handful of events end the obligation: the immigrant becomes a U.S. citizen, earns 40 qualifying quarters of work credit (roughly 10 years), permanently leaves the United States, or either the sponsor or the immigrant dies.³ Divorce does not end it. Neither does bankruptcy or financial hardship. Courts have held sponsors liable long after a marriage has ended.

How to Submit the Letter or Form

None of these documents go straight to the embassy from you. For an invitation letter, hand the letter and attachments to the visa applicant, who presents them at the consular interview. For the I-134 or I-864, give the completed form and financial documents to the applicant, who submits them with the visa application; the consular officer reviews them at the interview. In an adjustment-of-status case filed inside the United States, the I-864 goes to USCIS with the applicant’s package.

Keep copies of everything. If you filed an I-864, you may need to look at it years later. Organize attachments in the order the form instructions specify and label them so the reviewing officer can match each document to the right section.

1
U.S. Department of State. Visitor Visa
2
U.S. Citizenship and Immigration Services. I-134, Declaration of Financial Support
3
U.S. Citizenship and Immigration Services. Affidavit of Support
4
Office of the Law Revision Counsel. 8 USC 1183a – Requirements for Sponsors Affidavit of Support
5
U.S. Citizenship and Immigration Services. I-864P – HHS Poverty Guidelines for Affidavit of Support
6
U.S. Citizenship and Immigration Services. Form I-864 Instructions for Affidavit of Support