An affidavit of cohabitation is a sworn statement in which a primary resident confirms, under oath, that another person lives at the same address. It’s most often requested when someone applying for a driver’s license, enrolling a child in school, or seeking government benefits can’t produce residency documents in their own name. Because the signer makes the statement under oath or penalty of perjury, a false answer can bring a federal perjury charge carrying a fine, up to five years in prison, or both.1Office of the Law Revision Counsel. 18 U.S. Code 1621 – Perjury Generally That legal weight is the reason agencies accept it.
When You Need One
The most common trigger is the DMV. Under the federal REAL ID Act, every applicant for a driver’s license or state ID must present at least two documents showing their principal residence, and each state decides which documents qualify.2eCFR. 6 CFR 37.11 – Application and Documents the Applicant Must Provide Someone living with a parent, partner, or roommate often has no utility bill or lease in their own name, and many states list a cohabitation affidavit as an accepted substitute.
School districts are the second big user. When a family moves in with relatives and the parent isn’t on the lease, districts typically require a signed affidavit from the homeowner or leaseholder before they’ll enroll the child. Without one, the district can refuse enrollment on the grounds that residency inside district boundaries hasn’t been established.
Social service agencies rely on residency verification too. Programs like SNAP and Medicaid care where applicants live because household composition affects eligibility and benefit amounts. A cohabitation affidavit paired with a supporting document can satisfy that requirement when traditional proof of address isn’t available.
What to Gather Before You Start
Requirements vary by agency, but nearly every version of this affidavit asks for the same core information:
- Full legal names of both the primary resident (the affiant) and the person living with them. Names must match government-issued ID exactly. “Robert” on the affidavit when the license says “Bob” can cause a rejection.
- Complete residential address: street number, street name, apartment or unit, city, state, and ZIP. A P.O. box won’t work because the point is to prove where someone physically lives.
- Move-in date for the cohabitant. Some agencies compare this against other records, so estimate carefully if you don’t remember the exact day.
- The relationship between the parties. Family member, landlord, or unrelated roommate — some agencies impose extra requirements when the parties aren’t related.
- Supporting residency documents belonging to the affiant: a current lease, mortgage statement, property tax bill, or utility bill. Some agencies want two. Check the form’s instructions before your appointment.
A few forms also ask for dates of birth, but this isn’t universal. Read every field before you start writing.
Filling Out the Form
The most important step happens before you write anything: get the correct form from the agency that’s requesting it. A generic affidavit downloaded from a legal-templates site is often rejected because it lacks the specific disclosures, formatting, or case numbers the agency requires. Check the agency’s website for a downloadable PDF or pick one up in person.
Use blue or black ink and print clearly. Most forms have two sections. The first collects the cohabitant’s information: name, date of birth if requested, and the shared address. The second is where the affiant makes the sworn statement, confirming that the named person lives at the address, describing the living arrangement, and declaring the relationship.
Fill in every field. A blank space, even one that seems irrelevant, can be grounds for rejection. If a field genuinely doesn’t apply, write “N/A.” Double-check that the address matches what appears on your supporting documents character for character. “123 Main St” on the affidavit and “123 Main Street” on a utility bill has tripped up more applicants than you’d expect.
Do not sign the form yet. The affiant’s signature must happen in front of a notary or, in some cases, an authorized agency employee. Signing ahead of time invalidates the notarization and forces you to start over on a fresh form.
Getting It Notarized
Most agencies require notarization. The affiant signs in the physical presence of a notary public, who verifies the signer’s identity with a valid photo ID — driver’s license, passport, or state ID — watches the signature happen, applies an official seal, and logs the transaction. At that point the affidavit becomes a legally binding sworn statement.
Notary fees are regulated at the state level. Most states cap the charge for administering an oath or taking an acknowledgment somewhere between $5 and $15 per signature. Banks, shipping stores, and law offices often have a notary on staff. Mobile notaries will come to you if you can’t get to one during business hours, though they charge a travel fee on top of the per-signature rate.
Remote Online Notarization
As of early 2025, 45 states and the District of Columbia have enacted permanent laws allowing remote online notarization, where the signer and notary connect by live video. Whether a particular agency accepts a remotely notarized affidavit depends on that agency’s own rules, not just state law. Before booking a remote session, confirm with the requesting agency that they’ll honor it. Some DMV offices and school districts still require traditional in-person notarization.
The Unsworn Declaration Alternative
For federal matters, a lesser-known option exists. 28 U.S.C. § 1746 allows a written declaration “under penalty of perjury” to carry the same legal force as a notarized affidavit.3Office of the Law Revision Counsel. 28 U.S. Code 1746 – Unsworn Declarations Under Penalty of Perjury The declaration must be dated, signed, and include the statement “I declare under penalty of perjury that the foregoing is true and correct.” This won’t help at a state DMV or local school district, which set their own rules, but for federal benefit applications or immigration-related residency verification it can save a trip to the notary.
Submitting It and How Long It Stays Valid
Submission methods vary. DMV offices almost always require in-person delivery during your appointment, school districts usually accept hand-delivery to the enrollment office, and social service agencies may allow certified mail or electronic upload through a benefits portal.
Bring the original notarized affidavit along with your supporting residency documents, and make paper and digital copies of everything before handing anything over. Agencies rarely return originals, and if something gets lost you’ll want a backup.
Most agencies treat a cohabitation affidavit as valid for 30 to 90 days from the date of notarization. Don’t get it notarized months before you plan to use it. Check the requesting agency’s recency rules before scheduling your notary appointment.
Mistakes That Cause Rejections
These are the errors that waste people’s time most often:
- Signing before the notary appointment. The notary must watch you sign; a pre-signed form has to be redone on a fresh copy.
- Using a generic internet form instead of the agency’s own version.
- Name or address mismatches between the affidavit and your ID or supporting documents. Abbreviations, misspellings, and nickname variations all raise flags.
- Blank fields. Reviewers treat empty spaces as incomplete applications. Write “N/A” where something doesn’t apply.
- Missing supporting documents. The affidavit alone is rarely enough; most agencies want one or two residency documents from the affiant alongside the sworn form.
- Expired supporting documents. Agencies set their own freshness rules, and a bill even one day past the cutoff can sink the application.
Understand the Legal Weight Before You Sign
A cohabitation affidavit isn’t just paperwork. It’s a sworn legal statement, and the consequences can outlast the appointment it was written for.
Perjury Exposure
Knowingly making a false statement on a sworn affidavit is perjury under federal law, punishable by a fine, up to five years in prison, or both.1Office of the Law Revision Counsel. 18 U.S. Code 1621 – Perjury Generally State perjury statutes carry their own penalties. This applies to deliberate lies, such as swearing someone lives with you when they don’t, and to reckless disregard for the truth. If you’re unsure whether the person actually qualifies, don’t sign.
Tenancy Implications for the Primary Resident
Most people don’t think about this part. Swearing in a legal document that someone lives in your home can establish that person as a tenant, even without a written lease. Once someone has resident status, whether through an affidavit, through receiving mail at the address, or simply through the passage of time, removing them usually requires a formal eviction through the courts. You generally cannot change the locks or call the police to have them removed as a trespasser.
The exact rules depend on your state, but the pattern is consistent. If you invite someone to stay temporarily and then sign an affidavit confirming they live there, you’ve created a paper trail a court will take seriously in a later dispute. Before signing, think about the legal relationship the document creates, not just the bureaucratic box it checks.