How to Write an Invitation Letter for US Visa

An invitation letter supports a foreign national's request to enter the United States for a temporary purpose, most often a business trip, a conference, or a family or medical visit. It is written by a U.S. based host, signed and dated, and carried to the visa interview and the port of entry. No U.S. government agency publishes a required form for it, yet a clear and accurate letter is one of the most useful documents a traveler can bring. It helps an officer confirm the purpose, length, and funding of the trip, and it shows the visit is temporary. This guide explains what the letter is, when employers and visitors typically use one, what it usually contains, and how it differs from the support letters that work visas require. It is written for the U.S. host who signs the letter and for the foreign national who submits it, not from a law firm's internal process.

What an Invitation Letter for a US Visa Is

An invitation letter is a written statement from a person or company in the United States confirming that they have invited a specific foreign national to visit for a defined purpose and period. It is most relevant to two visitor categories: the B-1 temporary business visitor and the B-2 visitor for tourism, family, or medical reasons.

The letter does not grant any status or work authorization on its own. It functions as one piece of evidence among several. A consular officer reviewing a visa application, or a Customs and Border Protection officer at the airport, uses it to verify that the trip matches the visa category and that the visitor plans to leave when the business is done.

Because there is no official template, the value of the letter comes from how well it lines up with what the government already asks visitors to prove. The B-1 eligibility criteria on USCIS describe the points a letter commonly reinforces: a legitimate purpose, a limited stay, sufficient funds, and ties abroad that ensure the visitor returns. USCIS also lists general admissibility to the United States as a criterion.

Who writes it and who submits it

The host writes it. For a business trip, that is usually a manager or officer at the U.S. company that has invited the visitor for meetings or training. For a personal trip, it is the U.S. relative or friend hosting the guest. The foreign national then carries the signed letter to the visa interview and keeps a copy for the border inspection. Both sides have a role: the host states the facts, and the visitor confirms those facts match the rest of the application.

When an Invitation Letter Is Commonly Used, and When It Is Not

B-1 Temporary Business Visitor

A foreign national may qualify for B-1 status when entering the United States to take part in business activities of a commercial or professional nature. According to USCIS, permitted activities include consulting with business associates, attending a scientific, educational, professional, or business convention or conference on specific dates, settling an estate, negotiating a contract, and taking part in short-term training, among other activities.

The same USCIS guidance describes the eligibility points. The purpose is legitimate business, the stay is a specific limited period, the visitor has sufficient funds for the trip, and the visitor keeps a residence abroad they have no intention of abandoning, along with binding ties that ensure their return. USCIS also lists that the visitor is otherwise admissible to the United States. A B-1 visitor is generally admitted for one to six months, with six months as the maximum, and an extension is filed on Form I-539.

What B-1 does not allow is productive employment or a salary from a U.S. source. A visitor can discuss a deal, attend a board meeting, or observe a training session, but cannot fill a role, perform billable work, or draw U.S. wages. This is the central distinction in the B-1 category. Invitation letters in this category typically describe meetings, negotiations, conferences, consultations, or training, rather than anything that reads like a job.

B-2 Visitor for Tourism, Family, or Medical Care

The B-2 category covers personal visits: tourism, time with family, and medical treatment. A common scenario for employers is a B-1 business traveler whose spouse or child wants to come along. USCIS notes that B-1 dependents are not eligible for a dependent visa and each apply separately for a B-2. An invitation letter for a B-2 visit centers on the relationship between host and guest, the length of the stay, who pays for it, and where the guest will live during the trip.

Visa Waiver Program and ESTA

Travelers from participating countries can visit for business or tourism without a visa under the Visa Waiver Program. DHS explains that the program lets citizens of participating countries travel for stays of up to 90 days after obtaining an approved travel authorization through ESTA. DHS also states plainly that an approved ESTA is not a guarantee of admission, and that eligibility is decided by an officer at the port of entry.

That last point is why a letter still matters for visa free travelers. The activities allowed under the program track the same business and tourism limits, and the visitor is expected to explain the purpose of the trip at inspection. Carrying a host letter and an itinerary can help. Visa Waiver Program travelers generally cannot extend their stay or change status, apart from narrow exceptions such as a brief period of satisfactory departure, so the trip is expected to fit inside the 90 day window.

What a US Visa Invitation Letter Commonly Includes

A letter that mirrors the official criteria does most of the work for the officer. Such letters commonly appear on company or personal letterhead, are dated, and are signed, and cover the following points in plain language.

• Host information: Full legal name of the company or individual, U.S. address, and the relationship to the visitor. For a business letter, this names the officer signing and their title.
• Visitor information: Full name as it appears in the passport, passport number where appropriate, date of birth, and the visitor's role and employer abroad.
• Purpose of the visit: A precise description using activities allowed under the category. For B-1, that means meetings, a named conference, contract negotiation, consultation, or short-term training. For B-2, that means the family or medical reason for the trip.
• Specific dates and duration: Exact start and end dates, kept within the limited period the category allows. Vague or open ended timing is a frequent cause of doubt.
• Funding: Who pays for travel, lodging, and daily costs. For a B-1 visitor, letters commonly confirm that no U.S. salary will be paid and that any reimbursement is limited to incidental trip expenses.
• Accommodation and itinerary: Where the visitor will stay and a short outline of the planned schedule.
• Ties abroad: A brief statement reinforcing that the visitor will return home at the end of the trip.

Strong letter content typically names a specific conference with dates and a confirmed agenda; states the visitor remains employed and paid by their foreign company; confirms reimbursement is limited to travel and lodging; gives exact entry and exit dates inside the six month limit; identifies the U.S. host by name and title on company letterhead; and notes the visitor's family, property, or job ties at home.

Weak letter content describes the visitor "working on a project" or "supporting the team"; promises any U.S. payment beyond incidental expenses; gives open ended dates or says "as needed"; omits the relationship between host and visitor; uses generic language that could fit any trip; or says nothing about return to the home country.

A Common Letter Structure

The structure below appears in both business and personal invitations, and these letters are typically kept to one page.

1. Host and date. The letter opens with who the host is, their title, and their organization or relationship to the visitor.
2. Visitor and category fit. It identifies the guest and states the purpose in category appropriate terms, for example attending a named conference or a series of business meetings.
3. Dates and duration. It provides exact arrival and departure dates that stay within the allowed period.
4. Funding. It explains who covers costs and, for B-1, confirms no U.S. wages are involved.
5. Logistics. It notes accommodation and a short itinerary.
6. Ties and intent. It confirms the visit is temporary and that the visitor will return home, and it is signed.

The letter is typically paired with the following supporting materials: proof of funds, employment confirmation from the home country, and evidence of ties such as property or family. Consistency across the letter and the supporting materials is critical. Inconsistency between the stated purpose, the dates, and the documents is one of the most common reasons a visitor cannot establish that the trip is temporary.

Invitation Letters vs. Employer Support Letters for Work Visas

This is where employers most often get confused, and the difference has real consequences. An invitation letter supports a short visit with no U.S. work and no U.S. pay. An employer support letter is part of a work visa petition filed with USCIS on Form I-129, and it carries specific evidence requirements set by regulation. When the role involves productive work, day to day U.S. operations, or U.S. wages, the visit relates to a petition based visa, not an invitation letter.

H-1B Specialty Occupation

For an H-1B, the employer first obtains a certified Labor Condition Application from the Department of Labor through the FLAG system before filing the petition. The employer's support letter then describes the specialty occupation, the duties, and the required degree. As USCIS explains, the agency, not the Labor Department, determines whether the position qualifies as a specialty occupation. Separate measures introduced for the 2025 and 2026 seasons may also apply, including an additional $100,000 payment requirement for certain new H-1B petitions filed on or after September 21, 2025, and a wage weighted cap selection process effective February 27, 2026, beginning with the FY 2027 lottery.

L-1 Intracompany Transferee

For an L-1, the support letter establishes a qualifying relationship between the U.S. and foreign entities, such as a parent, branch, subsidiary, or affiliate, and shows that the company is doing business in the United States and abroad. USCIS also requires that the employee worked for the qualifying organization abroad for one continuous year within the three years before admission.

O-1 Extraordinary Ability

For an O-1, the petition package is more involved than any invitation letter. Per USCIS, the petitioner submits a written advisory opinion from a peer group or appropriate organization, copies of any written contracts between the petitioner and the worker, and an explanation of the events or activities with their dates and an itinerary. Recommendation letters from experts carry much of the evidentiary weight, which is why they are drafted with care rather than treated as a formality.

Common Mistakes That Lead to Denials

• Describing a visit as work. Any hint of productive U.S. employment or U.S. pay moves the case out of the B-1 category.
• Open ended or mismatched dates. Timing that does not match the stated purpose undercuts the temporary nature of the trip.
• No ties to the home country. Without evidence of a residence and binding ties abroad, a visitor struggles to show they will return.
• Inconsistent documents. When the letter, the itinerary, and the financial records disagree, the officer cannot confirm the purpose.
• Using a visitor visa for a role that needs a petition. When the work is ongoing or paid by a U.S. entity, the petition based path is a work visa with an employer support letter, not an invitation.

Why Choose Alma for Employer Sponsored Visas

Most invitation letters for short visits can be written in house by the host. The harder and higher stakes work is the petition support letter for a work visa, where the quality of the drafting and the evidence often shapes the outcome. That is the work Alma is built for.

Alma is an attorney led, technology enabled immigration platform that supports H-1B, L-1, O-1, TN, H-1B1, E-3, E-2, and the employment based green card categories. Alma assigns a dedicated attorney to each case, with experienced attorneys leading the work rather than paralegals, and pairs that attorney with a platform that handles document upload, deadline alerts, and real time case tracking, so employers and employees can see exactly where a petition stands.

Transparent flat fees. Alma publishes per visa pricing on its pricing page. Common employer cases include an H-1B cap or cap exempt petition at $3,500, an L-1 initial or new office petition at $6,000, an O-1 new petition at $8,000, and a TN new petition at $3,000. Employment based green cards such as EB-1A, EB-1B, EB-1C, and EB-2 NIW are $10,000, reduced to $7,000 for an EB-1 or EB-2 NIW filed with an approved O-1. Responses to a Request for Evidence are included in the base fee, and Alma offers 50/50 payment plans and volume discounts. These figures cover legal services. Government filing fees are set by USCIS and are separate. USCIS also offers optional premium processing on Form I-907. For most Form I-129 employment classifications, including H-1B, L-1, O-1, TN, and E-3, USCIS uses a service standard of 15 business days for a fee of $2,965, effective March 1, 2026, while H-2B and R-1 petitions carry a lower premium processing fee of $1,780. Premium processing commits USCIS to taking a timely action within the window, such as an approval, a denial, a request for evidence, or a notice of intent to deny, rather than an approval itself.

Built for speed and visibility. Alma reports a 98%+ approval rate on its cases and prepares cases in about two weeks once it has the information it needs, with direct attorney access throughout. This case preparation timeline is distinct from USCIS processing times, which USCIS publishes by form on a national basis at its processing times page and which no longer reference a specific service center location. For companies hiring across several roles at once, the platform consolidates legal fees, government fees, and case status in one place. Employers can read client stories or get started to review a specific hire.

Talk Through Your Visa Strategy with Alma

Not sure whether your visitor relates to an invitation letter or a full work visa petition? Alma's team helps employers and employees understand the options, from a short B-1 business trip to an H-1B, L-1, or O-1 petition. Every case is handled by a dedicated attorney, tracked in one platform, and priced as a transparent flat fee set upfront, so the cost is clear before filing. Schedule a consultation to map out the route for your hire.