How to Write an Affidavit Letter for Immigration: Sample & Guide
- Sonya Peterkin, Esq.

- Aug 31, 2024
- 7 min read
Updated: 2 days ago

An affidavit letter for immigration is a written statement provided by a person with firsthand knowledge of facts relevant to an immigration matter. These letters are commonly used to provide supporting information about family relationships, marriages, character, or other circumstances connected to an immigration application or petition.
These statements may provide supporting information about a family relationship, marriage, or other circumstances connected to an immigration petition or application. For example, someone who personally knows a married couple may provide an affidavit describing observations relevant to a bona fide (good faith) marriage.
Affidavits may also be relevant in immigration matters involving issues such as good moral character or abuse within a marriage, depending on the immigration benefit and circumstances involved.
A useful affidavit should be truthful, specific, and based primarily on what the person writing it personally knows or has observed.
The Affidavit letter should be a personal declaration that includes:
The name, date and place of birth, phone number, and address of the affiant (person writing the letter).
The history of the personal relationship with the applicant.
Details of how the affiant came to acquire the knowledge stated in the declaration, such as the legitimacy of the applicant’s marriage.
Penalty of Perjury Language. The letter does not need to be notarized, but it is important to include a sworn statement that states, “I swear, under penalty of perjury, that the foregoing is true and correct to the best of my knowledge.”
Date and signature.
Who to consider for writing an Affidavit?
Individuals who might be fit to provide such a statement should be someone close to the applicant, such as a friend or a family member or anyone with firsthand knowledge of the applicant's claims.
The affiant should be able to provide specific narratives and direct instances to adequately support the case.
How to format an immigration affidavit letter?
Opening statement- It is vital that the introduction outlines the name of the affiant, age, citizenship status, relationship to the immigrant, and the duration of their relationship with the applicant.
Body Paragraph- This is where the affiant will provide statements and instances that help prove the applicant’s claim based on their firsthand knowledge and observations. Whenever possible, the affiant should provide specific examples to give a more detailed illustration.
Closing statement- The last statements should summarize the statements made and what conclusion the affiant wishes for the officer to draw at the end of reading his or her letter.
An affidavit should not be used as primary evidence in a case where other objective evidence exist.
In other words, affidavits should be used to either fill in gaps in cases where stronger evidence may not exist, or to support other existing evidence that is used as primary evidence in a case.
Form-filling is just one very important aspect of filing a successful immigration case. Interpretation and application of the law, strategy, and providing accurate supporting documents and sufficient documentary evidence are some of the other very important components of a successful immigration case.
Affidavits can also support Green Card applications, especially in cases based on marriage or family relationships. In many family-based cases, the process begins with a Form I-130 petition to establish the qualifying relationship. For example, if someone is applying for a marriage-based Green Card, letters from friends or relatives who know the couple personally can help show that the marriage is genuine. These statements provide valuable context that official documents may not fully capture.
Keep in mind, affidavits should only serve as supporting evidence. Immigration officers usually prefer stronger records such as financial documents, leases, or photographs. Still, when those are limited, affidavits can help fill in the gaps.
For guidance on using affidavits effectively, it’s wise to consult an experienced Green Card immigration lawyer who can make sure your case is supported with the right evidence.
Let us help you! For a private case evaluation, leave us a message or call us at 321-325-1125.
Structure: Affidavit Sample Letter for Immigration
AFFIDAVIT LETTER FOR IMMIGRATION PURPOSES
I, [Your Full Legal Name], born on [Your Date of Birth], and currently residing at [Your Complete Address], declare under penalty of perjury that the following statements are true and correct to the best of my personal knowledge and understanding.
1. Relationship to the Applicant
I have known [Applicant’s Full Name] since [Month, Year].
I know the applicant because [describe your relationship, such as friend, family member, coworker, neighbor, or other personal connection].
Through this relationship, I have had the opportunity to personally observe and learn about [applicant’s relationship, family circumstances, character, or other relevant facts].
2. Purpose of This Statement
I am providing this affidavit to share facts within my personal knowledge that may be relevant to [Applicant’s Full Name]’s immigration matter.
This statement is intended to describe my personal observations regarding [relationship, marriage, family circumstances, character, or other relevant information].
3. Personal Knowledge and Observations
During the time I have known the applicant, I have personally observed and experienced the following:
[Describe a specific event, interaction, or experience you personally witnessed. Include details such as dates, locations, or circumstances when appropriate.]
[Describe another specific example that supports the purpose of the affidavit based on your firsthand knowledge.]
[Describe additional observations or experiences that provide relevant context about the applicant or their circumstances.]
The information provided above is based on my own experiences and observations. I am not providing information based solely on what another person has told me.
4. Sworn Declaration
Based on my personal knowledge and firsthand observations, I declare that the information provided in this affidavit is true and correct.
I declare under penalty of perjury under the laws of the United States of America that the foregoing is true and correct.
Signature of Declarant: _______________________________
Date: _______________________________
Printed Name: _______________________________
Phone Number: _______________________________
Email Address: _______________________________
Important Note:
An immigration affidavit should accurately describe the writer’s own experiences and observations. A sample format can help explain the general structure of an affidavit, but the final statement should be prepared based on the specific facts and requirements of the immigration matter involved. Additional requirements, including notarization or specific filing instructions, may apply depending on the purpose of the affidavit.

Common Mistakes to Avoid When Writing an Immigration Affidavit
Being Too General
Statements such as “They are a great family” or “Their marriage is genuine” provide little information unless the writer explains the experiences supporting that conclusion.
Copying a Sample Word for Word
A template can help with structure, but the facts should come from the writer's actual experiences.
Describing Events You Did Not Personally Witness
Make clear what you personally know. Avoid presenting information learned from someone else as though you observed it yourself.
Exaggerating the Facts
The purpose of an affidavit is to provide truthful information. Do not embellish events in an attempt to make the immigration case appear stronger.
Failing to Explain the Relationship
The reader should understand how the writer knows the applicant and why the writer is in a position to provide relevant information.
Leaving Out Specific Examples
Whenever possible, describe concrete events, interactions, or observations instead of relying on broad praise.
Relying on an Affidavit When Other Evidence Is Required
An affidavit may provide supporting information, but it does not automatically replace documentation required for a particular immigration benefit.
Immigration Letter of Support, Immigration Affidavit, and Form I-864: What's the Difference?
Immigration terminology can be confusing because phrases such as immigration letter of support, immigration support letter, reference letter, and affidavit letter are sometimes used interchangeably in everyday conversation.
They do not necessarily describe the same legal document.
Immigration Affidavit
An immigration affidavit is generally a statement in which a person provides facts based on personal knowledge.
For example, a friend may describe personal observations about a married couple's relationship.
Immigration Letter of Support
An immigration letter of support or reference letter may be written to provide information about a person, relationship, character, or other circumstances relevant to an immigration matter.
Its purpose and requirements depend on the immigration filing involved.
Form I-864 Affidavit of Support
A personal affidavit or support letter should not be confused with Form I-864 Affidavit of Support.
Form I-864 is a specific financial sponsorship document used in most family-based immigrant cases and certain employment-based cases. A qualifying sponsor who signs Form I-864 accepts particular financial sponsorship obligations under federal immigration law.
Understanding what the document is intended to establish is important before deciding what kind of statement or form is appropriate.
Please also ask-
Q1. Can I use an affidavit of support for immigration cases in Clermont, FL?
Ans: Yes. In my practice here in Clermont and surrounding area, I regularly prepare affidavits of support for clients. These affidavits can be used in immigration cases across the United States, but working with a local immigration attorney ensures that your affidavit meets USCIS requirements and is tailored to your specific case.
Q2. Who can write an affidavit of support for a marriage-based Green Card in Florida?
Ans: From my experience handling marriage-based Green Card cases in Clermont or Central Florida, affidavits can be written by anyone who personally knows the couple—friends, relatives, or even close community members. The key is that the affiant provides specific, truthful examples that show the marriage is genuine.
Q3. Do affidavits for immigration cases need to be notarized in Florida?
Ans: No, they do not. USCIS does not require notarization for immigration affidavits in Florida or anywhere else in the U.S. What’s most important is including the correct sworn statement: “I declare under penalty of perjury that the foregoing is true and correct.” This is what gives the affidavit legal weight.
Q4. How Do I Write an Immigration Affidavit for a Family Member?
Ans: When I guide clients in Clermont through this process, I recommend including your full legal name, address, date of birth, your relationship to the immigrant, and detailed examples that demonstrate your knowledge of the case—for example, attending their wedding or knowing details about their daily life. Having an immigration lawyer review the draft can make sure nothing important is missed.
Q5. Can Affidavits Help Support a Marriage-Based Green Card Application?
Ans: Affidavits are commonly used in Green Card applications, particularly in marriage-based cases, when additional personal observations may help provide context about the relationship.
Q6. What should I include in an affidavit for immigration in Florida?
Ans: An affidavit should always include your full name and Florida address, your relationship to the applicant, and specific examples of what you’ve personally witnessed—such as family gatherings, shared milestones, or consistent cohabitation. And don’t forget the perjury declaration at the end with your dated signature.
Q7. Where can I get legal help for affidavits of support in Clermont, FL?
Ans: At my office in Clermont, I help clients draft, review, and submit affidavits of support that strengthen their immigration cases. If you need assistance, you can contact the Law Office of S.A. Peterkin at (321) 325-1125 for a private consultation.




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