Can an Employer Change Your Employment Contract After You Sign?

Can an employment contract be changed without your consent?

It depends on what kind of arrangement you have. Most US employment is at-will, meaning either side can end it at any time for any lawful reason. Courts generally treat an at-will employer's announced change to future terms as a new offer, and treat your decision to keep working as acceptance. That is why an employer can usually lower future pay, change your schedule, alter duties or adopt a new policy without your signature, as long as it tells you before the change takes effect.

A contract for a fixed term, or one that limits termination to "cause," is different. Those terms are a promise, and one side cannot rewrite a promise on its own. Changes require mutual agreement, and many contracts add that amendments are valid only in a writing signed by both parties. If your employment contract has a defined term, a guaranteed salary or termination only for cause, read its amendment clause before you accept any change.

Montana is the main exception to the at-will default. Under its Wrongful Discharge from Employment Act, once you finish the probationary period (12 months by default since 2021), a discharge without good cause can be wrongful, which also limits how far an employer can push changes that amount to a forced exit.

Which changes can an at-will employer make, and which need your agreement?

The table below sorts common changes by type of arrangement. It is a general pattern; state law and the exact wording of your documents can shift the result.

Can my employer change my pay?

Going forward, usually yes for an at-will employee, but never backward. Once you have done the work at an agreed rate, that pay is earned and state wage laws protect it. A cut must apply only to work performed after you are told about it. Federal law adds floors: the Fair Labor Standards Act minimum wage still applies, and if you are classified as exempt from overtime, your salary cannot drop below the federal threshold of $684 a week (as of 2026, after the 2024 increase was vacated) without changing your overtime status. Some states set higher thresholds.

Some states also require written notice of a pay change. California, for example, requires employers to notify covered non-exempt employees in writing within seven calendar days of changes to the information in their wage notice, unless the change appears on a timely wage statement (Labor Code section 2810.5). For more on clauses that let an employer adjust salary, see the guide on pay-cut wording in offer letters.

Marcus is an at-will account manager in Illinois earning a base salary plus 8% commission. His employer announces that from the first of next month, the commission rate on new deals drops to 6%. Because he is at-will and the change applies only to deals closed after the notice, it is very likely lawful. But the employer also says commissions on deals Marcus already closed last quarter will be paid at the new rate. Those commissions were earned under the old plan, and paying less would likely violate his commission plan and state wage law. Marcus replies in writing accepting nothing about past deals, asks for the old rate on closed business, and keeps copies of the plan he signed. The employer corrects the payout.

Can an employer change the employee handbook or company policies?

Usually yes. Handbooks commonly say they are not contracts and that the employer may revise them at any time, and courts generally honor that language. Even where a handbook promise has become binding, an employer can often withdraw it prospectively. The California Supreme Court held in Asmus v. Pacific Bell, 23 Cal.4th 1 (2000), that an employer may end a unilateral policy of indefinite duration after a reasonable time, on reasonable notice and without interfering with vested benefits.

Two practical points follow. First, the acknowledgment you sign for a new handbook usually confirms you received it, not that you agreed to each term; read it before signing, and compare it with a plain employee handbook acknowledgment template to see whether yours adds an arbitration agreement or other waiver. Second, benefits that have already vested, such as accrued paid time off in states that treat it as wages, generally cannot be taken back by a policy change.

Can my employer make me sign a new non-compete or arbitration agreement?

An employer can ask, and in most states it can make continued employment conditional on signing. Whether the new agreement is enforceable is a separate question. For non-competes, several states require something more than continued employment. The Pennsylvania Supreme Court held in Socko v. Mid-Atlantic Systems of CPA, Inc. (2015) that a non-compete signed after employment begins needs new consideration, such as a raise, bonus or promotion, even if the document says the parties intend to be legally bound. Other states accept continued employment as enough. Washington already requires independent consideration for a non-compete signed after employment starts (RCW 49.62.020), ahead of its broader ban in 2027.

Arbitration agreements rolled out to current employees are often enforced when the employer gives clear notice and the employee keeps working, though some courts require an actual signature or reject terms that are hidden or one-sided. If you are handed either document mid-employment, ask what you get in exchange, and read our guide on being asked to sign a restriction after starting a job.

What changes are illegal no matter what the contract says?

• Changes made because of race, sex, age, disability, religion, national origin or another protected characteristic, which violate federal anti-discrimination laws such as Title VII.
• Changes made to punish you for reporting harassment, wage violations or safety problems, or for filing a complaint with a government agency.
• Retroactive pay cuts or deductions from earned wages that state law does not allow.
• Changes to wages, hours or other mandatory subjects of bargaining for unionized workers without bargaining with the union, which the Supreme Court held unlawful in NLRB v. Katz (1962).
• Changes that strip a contract's guaranteed terms, such as a fixed salary for a fixed term, without your agreement.

What if you only have an offer letter, not a formal contract?

Most employees never sign a separate employment agreement. Their terms are in an offer letter, a handbook and a few policies. In that case the offer letter usually describes starting pay, title and benefits and states that employment is at-will, which means those terms describe where the relationship starts rather than where it must stay. An employer can generally change them going forward.

There are exceptions worth checking. If the offer letter promised a specific bonus, a guaranteed first-year salary, a relocation package or severance on termination, those are commitments, and changing them after you have relied on them may breach the agreement. Equity grants are governed by the plan and award documents, which often limit what the company can change without your consent. Keep copies of everything you signed when you were hired, because you cannot compare a change with terms you cannot find.

What should you do when your employer changes your terms?

Get the change in writing, including the effective date. Then compare it with your signed documents: the offer letter, any employment agreement, equity grants, commission plans and the handbook. Note which terms were promised for a fixed period and which were "subject to change."

If you object, say so in writing before the effective date. Some workers continue working "under protest" while they negotiate or seek advice; that will not always preserve a claim, but it makes clear you did not agree. If the change is large, such as a significant pay cut or a move to a distant location, it may support a constructive discharge argument or, in many states, unemployment benefits if you quit for good cause. Those rules vary by state, so check before you resign.

Finally, do not sign a new agreement on the spot. Ask for a few days to review it, run it through an automated review to see what changed compared with your current terms, and talk to an employment lawyer if it adds a non-compete, arbitration or a repayment obligation.

How do you protect yourself from changes before you sign?

The best time to limit future changes is when you have the most leverage, before you accept. Look for a clause that says the employer may modify compensation, duties or policies "at its discretion," and ask for limits.

• Ask for base salary to be reduced only as part of a company-wide reduction applied equally to similar roles.
• Ask that commission plan changes apply only to deals signed after written notice.
• Add a "good reason" clause, so a material pay cut, demotion or relocation lets you resign and still receive severance.
• Require any amendment to the employment agreement to be in writing and signed by both sides.