Subletting vs Assignment: What's the Difference for Landlords?

TL;DR: In a sublet, your original tenant stays legally responsible for rent and lease terms, even though someone else lives there. In an assignment, the original tenant transfers the entire lease to a new person and is typically released from further obligation, unless your lease says otherwise. Most standard leases require written landlord approval for either, and roughly 40 states let landlords set reasonable conditions on that approval.

_Last reviewed: August 2026 · 7 min read_

A tenant asks to move out early and let a friend "take over" the apartment, and suddenly you're not sure if you're dealing with a sublet or an assignment, or whether it matters. It matters a lot, because the two arrangements put very different levels of risk on you as the landlord.

Okoniq Property Hub logs every lease amendment, sublet approval, and assignment agreement in one place, so you're never guessing who's actually responsible for a unit six months later.

What's the actual difference between subletting and assignment?

Subletting means your original tenant keeps their lease and brings in another person to occupy the unit and pay rent, usually for part of the remaining term. Assignment means the original tenant transfers the whole lease, including its remaining term and obligations, to someone else and typically steps out of the picture entirely.

The legal distinction comes down to who you can still collect from. If your tenant subleases and the subtenant stops paying, you go after your original tenant, because their name is still on the lease you signed. If your tenant assigns the lease and you accepted the assignment in writing, your original tenant is usually off the hook, and your only recourse is the new occupant, unless your lease specifically states the original tenant remains a guarantor.

This is why the clause covering subletting and assignment is one of the most overlooked parts of a rental agreement. Reviewing 7 lease clauses every independent landlord should understand is a good place to check whether your current lease even addresses this, because a lot of boilerplate templates leave it vague or silent.

Does a sublet or assignment change who I can screen?

Yes, and this is where landlords get exposed if they skip it. A sublet or assignment introduces a new occupant, and you have every right to run the same screening on them that you ran on the original applicant, including income verification and a credit check.

Don't assume the original tenant vetted the new person as carefully as you did. Decide upfront whether you'll use a hard vs soft credit pull for tenant screening on the incoming subtenant or assignee, and apply the same standard you use for every other applicant. Consistency matters here for a second reason: if you approve some sublets without screening and deny others based on who's asking, you risk a discrimination claim. Keep your criteria the same every time and document it, which ties directly into avoiding the pitfalls covered in Fair Housing Act — what landlords cannot ask.

Can I just refuse to allow either one?

In most states, yes, if your lease says so in writing. Roughly 40 states allow landlords to require written consent for subletting or assignment, and many leases include a "no subletting without landlord approval" clause by default. A handful of states, including New York for certain rent-stabilized units, limit how unreasonably a landlord can withhold that consent, so check your state's specific statute before you flatly deny every request.

The safest approach is a clause that doesn't ban subletting or assignment outright but requires the tenant to submit a written request, pay a $50 to $150 administrative fee to cover screening costs, and get your signed approval before anyone new moves in or takes over the lease.

| Feature | Sublet | Assignment | |---|---|---| | Original tenant liability | Stays on the hook | Usually released | | Who signs the lease | Original tenant only | New tenant (with landlord consent) | | Landlord's screening right | Applies to subtenant | Applies to assignee | | Typical term | Partial remainder of lease | Full remaining term |

What happens if a tenant sublets or assigns without telling me?

You have grounds to treat it as a lease violation, and depending on your state and lease terms, that can lead to eviction. An unauthorized occupant living in the unit, paying someone other than you, is exactly the kind of breach most standard lease violation clauses are written to cover.

Start with a written notice citing the specific clause violated, giving the tenant a set number of days (commonly 3 to 30, depending on your state) to cure the issue or vacate. If the unauthorized subtenant refuses to leave and your original tenant has abandoned the unit, you may need to pursue a formal eviction against whoever is currently in possession. The process for drafting that notice correctly is covered in how to write an eviction notice, and getting the wording right matters, because a poorly drafted notice can get thrown out and cost you weeks.

How should I write the lease clause to avoid this problem later?

Spell out three things explicitly: whether subletting and assignment are allowed at all, what approval process the tenant must follow, and what happens to liability in each case. A clause that simply says "no subletting" without defining assignment leaves a gap, because some tenants and even some courts treat assignment as a separate right if it isn't specifically addressed.

A clean clause requires 30 days' written notice before any sublet or assignment request, gives you the right to screen and approve or deny the new occupant using the same criteria applied to all applicants, and states plainly that the original tenant remains liable under a sublet but is released only upon your written acceptance of an assignment. Put a dollar figure on any administrative fee, and require the new agreement in writing, signed by all parties, before anyone moves boxes in.

FAQ

Is a roommate the same as a sublet?

No. A roommate typically signs the original lease or a separate roommate agreement approved at move-in, while a sublet involves someone moving in later to take over an existing tenant's space and rent obligation, usually mid-lease.

Can a tenant sublet on Airbnb without my permission?

Generally no, if your lease prohibits subletting or short-term rentals, and doing so without consent is grounds for a lease violation notice; many cities also require a separate short-term rental permit that your tenant likely doesn't have.

Does assignment end my lease with the original tenant automatically?

No, only if you accept the assignment in writing; verbally agreeing or simply accepting rent from the new person without formal paperwork can create ambiguity about who's actually liable if something goes wrong.

What fee can I charge for approving a sublet or assignment?

Most states don't set a hard cap, but $50 to $150 is common and should reasonably reflect your actual screening and administrative cost; charging an excessive fee just to discourage requests can look like an attempt to unreasonably withhold consent in states that regulate that.

Should I use different lease language for month-to-month tenants?

Yes, because a month-to-month tenant can typically just give 30 days' notice and leave rather than sublet, so your clause should clarify that subletting or assignment doesn't apply once the lease has converted to month-to-month, unless you want to allow it.

This is educational information, not legal advice. Consult a landlord-tenant attorney in your state before drafting or enforcing sublet and assignment clauses.