Addendum To Offer Letter Template Template for the United States

When you need to modify an existing employment offer without writing an entirely new agreement, an Addendum To Offer Letter Template gives you the legal framework under United States employment law. It lets you formalize changes to compensation, job duties, work schedules, or other terms while keeping the original offer letter valid and staying compliant with federal employment rules. Think of it as a contract addendum that sits on top of the original agreement rather than replacing it.

What is an addendum letter template?

An addendum letter template is a reusable document you fill in to change specific terms of an offer letter that has already been signed. It names the original contract, states the parts that are changing, and confirms that everything else in the original agreement stays the same. Because it references the offer letter directly, it keeps a clear paper trail linking the change back to the deal the employee first accepted. The same addendum template structure works whenever you amend a signed agreement, from an employment contract to a service agreement.

When do you need this document?

You'll need an addendum to your offer letter when something changes after the initial offer has been accepted. Common situations include promoting an employee to a new position with different responsibilities and pay, adjusting salary or benefits after a market review or performance cycle, moving someone to remote work or changing their schedule, adding or removing job responsibilities, or updating reporting lines. An addendum is useful here because it preserves the legal foundation of the original offer while recording the new terms cleanly.

What should an offer letter addendum include?

A complete addendum to offer letter usually contains the following:

• The names of the employer and employee, and the date of the original offer letter it amends.
• A clear statement that this document is an addendum to that original agreement.
• The exact terms being changed, written so there is no ambiguity about the old and new versions.
• The effective date of the change.
• Confirmation that all other terms of the original offer letter remain in force.
• Language confirming continued at-will status where that applies.
• Signature blocks and dates for both parties.

How do you fill in and sign the addendum?

Start from the sample in this template, enter the details of the original offer letter, and describe only the terms that are changing. Keep the wording specific so the employee can see exactly what is different. Once both sides agree, the employer and the employee sign and date the document. A signed addendum, kept alongside the original contract, is what makes the change enforceable, so store both together in your records. You can export the finished document as a PDF for signature or for your HR records.

Addendum vs. a new offer letter

An addendum changes named parts of an existing offer letter and leaves the rest intact. A new offer letter replaces the original deal entirely and can reset terms the employee already relied on. For a single change such as a raise or a location move, an addendum is usually the cleaner, lower-risk choice because it keeps the original agreement as the anchor. Reissue the whole letter only when so much is changing that a fresh document is genuinely simpler.

Key legal considerations

The addendum should reference the original offer letter with specific dates and parties to establish continuity. Detail every modification, including each amended clause, so it is clear what changes and what stays the same. Any pay change should be consistent with the Fair Labor Standards Act, particularly minimum wage and overtime. The new terms must not create discriminatory conditions under Equal Employment Opportunity Laws, the ADA, or the ADEA. Consider confirming the employee's continued at-will status where relevant, and check that nothing conflicts with existing company policies or collective bargaining agreements.

Where can you get a free, professional template?

You can draft this document from a free, professional Addendum to Offer Letter template on GenieAI and tailor it to your situation. Explore related HR and hiring resources, and if your team needs support amending several contracts at once, GenieAI drafts, reviews, and delivers ready-to-sign documents against your own playbook. Contact GenieAI to see how it helps commercial and HR teams keep agreements consistent as terms change through 2026.