How to Write a Financial Support Letter: Forms, Income, and Documents

To write a financial support letter, identify yourself and the person you’re sponsoring, state your relationship, describe exactly what expenses you’ll cover and for how long, and attach documents that prove you can afford it. If the letter is for a U.S. immigration case, you don’t actually draft a letter from scratch; you complete a specific USCIS form (I-864 or I-134) and attach the same kind of financial evidence. For a landlord or a university, a signed letter with bank statements, pay stubs, and tax returns is the standard package.

What Every Financial Support Letter Should Include

Five pieces of information carry the letter. Leave any one of them out and the reviewer has to come back to you, which at best delays the application and at worst gets it denied.

Your identifying information. Full legal name, home address, phone number, and email. Immigration forms also require your Social Security Number.
The beneficiary’s identifying information. Full legal name, current address, date of birth, and passport number if the letter supports a visa.
Your relationship. Spouse, parent, child, sibling, friend, business associate. Reviewers want to see why you’d take this on.
The financial commitment, in numbers. “I will cover all expenses” is weak. “I will provide $28,000 per year for tuition and $1,500 per month for housing” is strong. Break costs into categories the reviewer can match against your attached documents.
Duration. Name the time period: “for the 2026-2027 academic year,” “for the duration of the lease,” “until [name] obtains permanent employment.”

Address the letter to the specific office or official asking for it: the admissions office, the consular officer, the leasing manager. “To Whom It May Concern” works as a fallback but carries less weight. Sign and date the letter, and if the recipient requires it, have your signature notarized.

If the Letter Is for a U.S. Immigration Case, Use the Right Form

For most immigration purposes, the “financial support letter” is not a letter you compose. It’s a USCIS form with mandatory fields, and picking the wrong one is the single most expensive mistake a sponsor can make.

Form I-864, Affidavit of Support

Form I-864 applies to most family-based immigrants and some employment-based immigrants. It is a legally enforceable contract between you and the U.S. government.¹ By signing it, you agree to maintain the sponsored person at an annual income of at least 125% of the federal poverty guidelines. If the immigrant later receives means-tested public benefits such as Medicaid or SNAP, the agency that paid those benefits can demand you reimburse the cost and sue you for the amount plus legal fees. The sponsored immigrant can also sue you directly.²

USCIS publishes the form with specific fields and instructions that run more than a dozen pages. Fill in every required field. An incomplete form will be rejected.³

Form I-134, Declaration of Financial Support

Form I-134 is used for nonimmigrant (temporary) visa categories. It is not a legally enforceable contract, no one can sue you to enforce it, and there is no filing fee. Think of it as a declaration of your willingness and ability to support someone during a temporary stay.⁴

The I-134 still requires real evidence: bank statements, an employer letter, and a copy of your most recent federal tax return or recent pay stubs. Missing documents can result in the visa being denied.⁴

Income You Have to Prove as an I-864 Sponsor

If you’re filing Form I-864, your income must meet or exceed 125% of the federal poverty guidelines for your household size. Count yourself, your dependents, anyone you’ve already sponsored on a prior I-864, and the person you’re now sponsoring. Active-duty military members sponsoring a spouse or child need only meet 100% of the poverty line.⁵

The 2026 thresholds for the 48 contiguous states:⁶

Household of 2: $27,050
Household of 3: $34,150
Household of 4: $41,250
Household of 5: $48,350
Household of 6: $55,450

Alaska and Hawaii use higher numbers. A household of 2 in Alaska, for instance, needs $33,812.50.⁶

Using Assets If Your Income Falls Short

You can make up the gap with assets you could convert to cash within a year. The total value of those assets has to be at least five times the shortfall between your income and the required threshold. If the guideline for your household size is $27,050 and you earn $23,050, the gap is $4,000 and you’d need at least $20,000 in qualifying assets.³

The multiplier drops to three times the gap when a U.S. citizen is sponsoring a spouse or a child aged 18 or older.³

Bringing in a Joint Sponsor

If you don’t meet the income threshold on your own and don’t have enough qualifying assets, you can add a household member’s income to yours or find a joint sponsor. A joint sponsor files their own separate I-864 and takes on full legal responsibility for the immigrant. They must be a U.S. citizen or lawful permanent resident, at least 18, and domiciled in the United States.⁷

Two details catch sponsors off guard. Even with a joint sponsor covering the income gap, the primary petitioner still has to submit their own I-864. And if you don’t have a U.S. domicile, a joint sponsor cannot fix that for you.⁷

Documents to Attach

The written promise is only as strong as what you staple to it. Every number in the letter should match the attached documents exactly. A mismatch between claimed income and the tax return is one of the fastest ways to get an application denied.

For Immigration Forms

Tax returns. A copy of your most recent federal income tax return or an IRS tax transcript. If you filed jointly, include your W-2s or schedules. If you didn’t file, submit consecutive pay stubs for at least the past month, a recent W-2, or Form SSA-1099.⁴
Bank statement or bank letter. A statement from a bank officer showing when the account was opened, total deposits over the past year, and the current balance.⁴
Employer letter. On company letterhead, confirming your hire date, job title, salary, and whether the position is permanent or temporary.⁸
Proof of status. Joint sponsors and substitute sponsors should include a copy of a birth certificate, passport, or naturalization certificate for citizens, or both sides of the Permanent Resident Card for green card holders.²

Self-employed? You won’t have a standard employer letter. Substitute profit and loss statements, 1099 forms, or business bank statements showing consistent income.⁸

For Landlords and Universities

There’s no standardized form. Both audiences want the same basic proof: that you have enough money and are willing to spend it. Expect to provide recent bank statements, pay stubs or tax returns, and a government-issued ID. Landlords often require you to authorize a credit check and sign a guarantor addendum to the lease. Universities typically want documentation covering at least one year of tuition and living costs.⁹

What You’re Agreeing To When You Sign

The legal weight of your signature depends on which document you’re signing, and this is the part most sponsors read too fast.

An I-864 affidavit of support is a contract. Federal law makes it enforceable by the sponsored immigrant, the federal government, state governments, and any agency that provides means-tested public benefits.¹ Courts have enforced these obligations in divorce cases where the ex-spouse was the sponsored immigrant. A personal falling-out doesn’t end the obligation.

An I-134 declaration carries no enforcement mechanism. It’s a statement of intent, not a binding commitment. Providing false information on either form can still have immigration consequences.

A landlord guarantor letter creates a contractual obligation under the lease. If the tenant stops paying, the landlord can pursue you for the full amount owed, property damage, and in some cases legal fees. Your liability lasts as long as the lease unless the guarantor agreement says otherwise.

A university support letter is generally the least legally risky. You’re certifying that you have the funds. The school relies on that certification to issue immigration documents, and if you stop paying, the student can lose their visa status even if the university has limited means to collect from you directly.

When an I-864 Obligation Ends

If you signed an I-864, you remain on the hook until one of these happens:¹

The immigrant becomes a U.S. citizen.
The immigrant is credited with 40 qualifying quarters of work under Social Security (roughly 10 years), provided they didn’t receive federal means-tested benefits during any of those quarters after December 31, 1996.
The immigrant permanently leaves the United States.
The immigrant dies.

Divorce is not on that list. Neither is job loss, the immigrant finding a well-paying job, or you simply changing your mind. Sponsors have been held liable years after a marriage ended. Understand this before you sign.

Submitting and Notarizing

USCIS forms go through the agency’s online filing system or by mail to a designated lockbox. The I-864 instructions specify the correct filing address based on where the immigrant will apply for their visa.³ University admissions offices usually take uploads through an online portal. Landlords typically want a physical or emailed copy with original signatures.

Form I-864 does not require notarization because it includes a certification under penalty of perjury. Form I-134 and other support letters sent to embassies or consulates may require notarization depending on the specific post. Landlord letters sometimes need notarization depending on the property management company’s policy. Notary fees are set by state law, usually $2 to $25 per signature, and a few states let notaries set their own rates. Bring a government-issued photo ID to the appointment.

Keep copies of everything after you submit: the signed letter or form, every attached document, and any confirmation receipts. If the agency, school, or landlord comes back with questions months later, you’ll want those records at hand.

1
Office of the Law Revision Counsel. 8 USC 1183a – Requirements for Sponsors Affidavit of Support
2
U.S. Citizenship and Immigration Services. I-864, Affidavit of Support Under Section 213A of the INA
3
U.S. Citizenship and Immigration Services. Form I-864 Instructions for Affidavit of Support Under Section 213A of the INA
4
U.S. Citizenship and Immigration Services. Form I-134, Instructions for Declaration of Financial Support
5
U.S. Citizenship and Immigration Services. I-864P, HHS Poverty Guidelines for Affidavit of Support
6
U.S. Department of Health and Human Services. 2026 Poverty Guidelines
7
Department of State. I-864 Affidavit of Support FAQs
8
U.S. Department of State. Step 5 – Collect Financial Evidence and Other Supporting Documents
9
Department of Homeland Security. Reminder: Proof of Financial Support Needed to Issue Form I-20