Yes, your old boss can call your new job. No federal or state law forbids the contact itself, whether it comes as an answer to a reference check or completely out of the blue. What determines whether that call is a problem is the content of the conversation and the motive behind it. Truthful statements and honest opinions are almost always lawful. False claims, retaliation for a prior complaint, disclosure of protected medical information, or a deliberate effort to sabotage your new position can all give you a real legal case.
Why the Call Itself Isn’t Illegal
People often assume they have some right to be left alone by a former employer. They don’t. The legal system focuses on whether the communication was harmful and unjustified, not whether it occurred. A former manager who picks up the phone unprompted invites more suspicion about intent than a routine reference verification, but even an unsolicited call is not illegal on its own.
The legal questions kick in the moment the conversation starts. What was said, whether it was true, why the call was made, and what happened to your job afterward are the facts that matter.
What a Former Boss Can Legally Say
Most companies limit references to basic verifiable facts: dates of employment, job title, and sometimes whether you left voluntarily or were terminated. That caution is a business policy, not a legal requirement. A former boss who goes further and shares performance assessments is still on solid legal ground as long as the statements are truthful or represent honestly held opinions based on direct experience.
They can say you struggled with deadlines if that’s reflected in your reviews. They can say they wouldn’t rehire you. They can say you were terminated for cause if that’s what happened. Truth is the shield. A true statement, even an unflattering one, does not create liability. The same protection covers genuine opinions clearly framed as such, like “I didn’t think she was a strong fit for a management role.” Trouble starts when the line between honest assessment and fabrication gets crossed.
Salary History Restrictions
A growing number of jurisdictions prohibit prospective employers from asking about your previous pay, and some also restrict former employers from volunteering that information. These laws vary significantly by state and city, so whether your old boss can legally share your salary depends on where you work.
Reference Shield Laws
Roughly three dozen states have reference shield laws giving employers a qualified privilege when they respond to reference requests. Under these statutes, a former employer who shares performance information in good faith is immune from defamation liability even if the information turns out to be inaccurate. The privilege typically breaks only when the employer acts with malice, knowingly passes on false information, or deliberately misleads the new employer.
One detail matters a lot here: in most of these states, the privilege applies only when the reference was requested by a prospective employer or by you. An old boss who calls unprompted and volunteers damaging information likely falls outside the statute’s protection. Solicited versus unsolicited is often the line between a shielded communication and one you can sue over.
When Statements Become Defamation
A former employer’s statements cross into defamation when they are provably false, communicated to someone else, and cause you real harm. The critical word is “false.” Saying you were fired for theft when you were actually laid off during a restructuring is a false statement of fact that could support a defamation claim. Saying you were “difficult to work with” is an opinion and almost certainly is not.
To win a defamation case, you generally have to establish four things:
- A false statement of fact — not a negative opinion, but a specific factual claim that can be proven wrong.
- Publication to a third party, such as your new boss or an HR representative.
- Fault, meaning the person was at minimum careless about whether the statement was true; in many cases you must show they knew or should have known it was false.
- Actual harm, like losing the new job, being demoted, or another concrete financial loss.
Each state defines these elements slightly differently, and the filing window is tight. Most states give you between one and three years from the date the statement was made, and many set the deadline at just one year. Waiting too long can forfeit your ability to sue.
Tortious Interference With Your New Job
Even when everything a former boss says is technically true, they can still face liability if the point of the call was to destroy your new employment. Tortious interference focuses on conduct and intent rather than the truth of any particular statement.
You have to show that a valid employment relationship or concrete job offer existed, that your former employer knew about it, and that they took deliberate improper action to disrupt it. The classic scenario is a vindictive former boss who calls not to provide a legitimate reference but to torpedo your position out of spite. Even truthful statements can support this claim if the contact was driven by malice rather than any legitimate business interest.
Damage is the last piece. If your new employer ignored the call and nothing changed, there’s no claim, regardless of intent. You have to show the contact caused a concrete outcome like termination, a rescinded offer, or a demotion.
Retaliation for a Prior Complaint
Federal civil rights law adds a layer of protection people often overlook. If you previously filed a discrimination complaint, participated in a workplace investigation, or otherwise asserted your rights against your former employer, a negative reference given in response to that protected activity is illegal retaliation.
The U.S. Supreme Court settled the point in Robinson v. Shell Oil Co., holding that Title VII’s anti-retaliation protections extend to former employees. Allowing employers to punish workers through post-employment actions like poisoned references would discourage anyone from ever reporting discrimination.
A retaliation claim has three elements: you engaged in protected activity, the former employer took a materially adverse action such as a dishonest negative reference that cost you a job, and there is a causal link between the two. A former supervisor who tells a prospective employer you were a “troublemaker” who “started a lawsuit” and isn’t someone they’d “want to get mixed up with” is describing textbook retaliation if it leads to a withdrawn offer.
A former employer can defeat the claim by showing the negative reference reflected an honest assessment of your job performance unrelated to the prior complaint. The question is whether the reference happened because of your protected activity or would have been given regardless.
Discriminatory References
Separate from retaliation, it’s illegal for a former employer to give a negative or false reference because of your race, color, religion, sex, national origin, age (if you are 40 or older), disability, or genetic information. The reference doesn’t need explicitly discriminatory language. If a former boss provides glowing references for employees outside your protected class but consistently negative ones for employees who share your characteristics, that pattern can support a discrimination claim.
Medical and Disability Information
The Americans with Disabilities Act imposes strict confidentiality requirements on medical information obtained during employment. Any medical records, disability-related inquiries, or health information your former employer gathered must be kept confidential and stored separately from your general personnel file. Sharing that information with a prospective employer during a reference check violates federal law. A former boss who mentions your medical condition, disability status, or mental health history to your new employer is breaking the ADA’s confidentiality mandate regardless of whether the information is accurate.
Filing an EEOC Charge
If you believe a former employer gave a retaliatory or discriminatory reference, you can file a charge with the Equal Employment Opportunity Commission. The standard deadline is 180 calendar days from the date the retaliatory action occurred, extended to 300 days if a state or local agency enforces a similar anti-discrimination law. The 180-day window moves fast, and missing it can eliminate your federal claim entirely.
State Blacklisting Laws
Many states have specific anti-blacklisting statutes that go beyond defamation. Blacklisting occurs when a former employer actively works to prevent you from getting hired elsewhere, often by sharing damaging information with prospective employers or coordinating with others in the industry to shut you out. There is no comprehensive federal blacklisting law, so these protections are entirely state-dependent.
A blacklisting claim can be easier to bring than defamation. Some states don’t require you to prove you lost a specific job; the act of blacklisting itself is enough. Several states also allow enhanced penalties, including treble damages (three times your actual losses) plus attorney’s fees. The definitions vary, so your state’s specific statute matters.
When a Non-Compete Justifies the Call
Sometimes a former employer’s contact with your new job feels vindictive but has a legitimate legal basis: enforcing a non-compete or non-solicitation agreement. If you signed one, your former employer may have a contractual right to notify your new employer that you are subject to restrictions. This is one of the few situations where unsolicited contact from a former employer has clear legal justification.
Non-competes remain enforceable in most states, though the rules vary widely. Courts evaluate the reasonableness of these agreements based on their scope, duration, and geographic limits. An overbroad agreement may not be enforceable at all, which would strip away the justification for the contact. And a former employer who uses a non-compete notification as a pretext to badmouth you or share unrelated negative information has gone well beyond legitimate enforcement.
Finding Out What’s Actually Being Said
The hardest part is often figuring out whether your former employer is saying anything harmful at all. If you keep getting deep into hiring processes only to have offers evaporate after the reference check stage, that pattern is worth investigating.
Reference checking services exist for this purpose. They contact your former employer posing as a prospective employer and document exactly what is said. Most cost a couple hundred dollars and produce a written record of the conversation, which becomes valuable evidence if you pursue legal action. Documentation is the key benefit: instead of suspecting something is wrong, you have a concrete record of what was communicated.
What to Do If Your Old Boss Crossed the Line
Start with documentation. Write down who made the contact, when it happened, what was said as precisely as you can reconstruct it, and what changed afterward. A timeline showing your employment status shifted right after the contact is some of the strongest circumstantial evidence you can build. Save any emails, text messages, or written communications that back up the contact or its effects.
If retaliation for a prior discrimination complaint is in the picture, file an EEOC charge within the applicable deadline. Don’t let the 180-day clock run out.
For defamation or tortious interference, an attorney can send a cease and desist letter demanding that your former employer stop the harmful communications. That letter puts them on formal notice and often ends the behavior on its own, because most employers stop once they understand the legal exposure. If the conduct continues afterward, you have both the underlying harm and evidence that it was deliberate, which strengthens any eventual claim.
An employment attorney can evaluate which theories fit your situation — defamation, tortious interference, retaliation, blacklisting, or some combination. Many offer free or low-cost initial consultations, and some take these cases on contingency, meaning you pay nothing unless you win.