The core difference between subletting vs lease assignment is who stays on the hook: a sublet keeps you as the tenant of record while a temporary occupant pays you rent, and an assignment transfers the rest of the lease term to a new tenant who deals directly with the landlord. Both can let you leave a rental early. Neither, by default, actually frees you from financial responsibility. That default is where most tenants get burned.
How Subletting Works
A sublease stacks a second rental arrangement on top of your existing one. You stay on the master lease and become something like a landlord yourself, called the sublessor. The new occupant, the subtenant, pays rent to you, and you keep paying the landlord. Every obligation in your original lease still belongs to you.
This structure fits temporary absences: a semester abroad, a summer internship, a short work assignment in another city. You expect to come back and finish out the term. Because the subtenant has no direct relationship with the landlord, you sit in the middle. The landlord looks to you for the rent and for anything the subtenant breaks, and your tools to control the subtenant’s behavior are limited to whatever you built into the sublease agreement.
That middle position carries real risk. If a subtenant refuses to leave when you return, the landlord may find it simpler to evict both of you rather than referee the dispute. If the subtenant does something seriously wrong in the unit, the landlord can move to evict you to get the subtenant out. You do not have immunity from the consequences of whoever you put in the apartment.
How a Lease Assignment Works
An assignment transfers the whole remaining lease term to a new tenant, the assignee. The assignee steps into a direct relationship with the landlord and inherits every obligation in the lease: rent, maintenance, pet rules, noise restrictions, all of it. You give up the right to occupy the unit and generally cannot reclaim it.
Here is where the facts get dangerous. An assignment does not automatically release you from liability. Unless the landlord signs an explicit release, you remain on the hook for the full remaining rent if the assignee stops paying. You effectively become a guarantor. If the assignee defaults six months in, the landlord can come after you for every dollar.
This surprises people because handing off responsibility feels like the point of an assignment. But the original lease is a contract between you and the landlord, and that contract does not evaporate just because someone new moved in. The assignee is also liable, so the landlord has a choice of who to pursue. Without a written release, you and the assignee share exposure for the rest of the term.
Which Option Fits Your Situation
If you plan to come back, sublet. The lease is still yours when you return, and the subtenant is a short-term occupant you can structure the agreement around. If you are leaving for good, assignment is the cleaner structure, because it ends your right to the unit and transfers the term to someone who wants it. But cleaner on paper is not the same as cleaner financially. Whether assignment actually ends your exposure comes down to whether the landlord releases you in writing.
Why a Written Release Matters
If your goal is to walk away cleanly from an assignment, the single most important document is a release of liability signed by the landlord. The release states that the landlord will look only to the assignee for future obligations and will not pursue you. Without it, you are a silent guarantor on someone else’s performance, potentially for years.
Not every landlord will agree. Keeping you on the hook is free insurance from their perspective. It is still worth negotiating, especially if your assignee has strong credit and income. Some landlords will grant a release in exchange for a higher assignment fee or an extra month’s rent as a buffer. Others will refuse, and at that point you have to weigh whether assignment still beats paying out the remaining lease or finding a subtenant instead.
One limit applies even with a valid release: you remain responsible for anything that accrued before the transfer date. Unpaid rent, utility balances, or damage from before the assignee moved in stay your problem regardless of what the release says about future liability.
Getting Landlord Consent
Almost every standard residential lease requires written landlord approval before you can bring in a subtenant or an assignee. Pull out the lease and find the clause that addresses transfers. It may be labeled “Assignment and Subletting,” “Use and Occupancy,” or something similar. The clause tells you whether transfers are prohibited outright, allowed with consent, or allowed only under specific conditions.
When a lease says transfers require consent, most jurisdictions apply a reasonableness standard. The landlord can say no, but the refusal has to rest on legitimate grounds. Denying a proposed replacement because of poor credit history or insufficient income is reasonable. Denying someone solely because the landlord wants to raise the rent or prefers to keep the unit empty generally is not. Rules vary by jurisdiction, but the principle that landlords cannot unreasonably block a qualified replacement is widely recognized.
Reasonable grounds for denial typically include financial concerns, intended uses that conflict with the lease, and reputational concerns about the proposed occupant. Landlords do not have to accept whoever you propose, but they are expected to evaluate candidates using the same criteria they would apply to any new applicant.
What Happens if You Skip Approval
Moving someone in without approval is a lease breach in nearly every jurisdiction. The consequences are not hypothetical. Unauthorized subletting gives the landlord grounds to terminate the lease, pursue eviction of you and the unauthorized occupant, and hold you responsible for any damage or unpaid rent. In many places the landlord issues a notice to cure the violation within a short window, often just a few days. If the occupant is not out by the deadline, eviction proceedings begin.
There is also an insurance problem. If an unauthorized occupant causes a fire or injures someone in the building, insurance claims can be denied because the occupancy was never disclosed. You end up personally exposed for damages that insurance would otherwise cover. A few hundred dollars saved by skipping approval can turn into tens of thousands in liability.
Security Deposits
How the deposit is handled depends on which route you take. In a sublease, your deposit with the landlord stays put. You collect a separate deposit from the subtenant, inspect the unit when they leave, deduct for any damage, and return the rest. You are acting as the subtenant’s landlord for deposit purposes and must follow the same deposit-return rules that apply in your jurisdiction.
In an assignment, your deposit either transfers to the assignee’s name or gets returned to you, with the assignee posting a fresh deposit. The specific arrangement depends on landlord policy and whatever you negotiate. Either way, document the handoff in writing so no one argues later about who is owed what.
Regardless of the structure, do a thorough walkthrough and photograph the unit before anyone new moves in. That record protects you from being charged for damage the subtenant or assignee causes, and it gives the incoming occupant a baseline to dispute unfair deductions.
Taxes on Sublet Income
Money you collect from a subtenant is rental income, and the IRS expects you to report it. Even if you are breaking even by charging the subtenant the same rent you pay the landlord, the payments you receive are taxable and go on Schedule E of Form 1040.1Internal Revenue Service. Topic no. 414, Rental Income and Expenses
You can deduct expenses tied to the sublease against that income. Rent you pay to the landlord for the sublet period, utilities you cover, and maintenance costs during the sublease are potentially deductible. A security deposit you may have to return is not income. If you keep part or all of a subtenant’s deposit for damage or unpaid rent, the amount you keep becomes taxable in the year you keep it.1Internal Revenue Service. Topic no. 414, Rental Income and Expenses
Advance rent is taxed in the year you receive it, no matter what period it covers. A subtenant who pays you the last two months upfront has handed you taxable income for the current year. Sublessors miss this and end up with an unexpected bill.
Assignments do not create this issue for you, because the assignee pays the landlord directly.
Insurance Gaps
Your landlord’s property insurance does not cover a subtenant’s belongings or liability. Your own renter’s insurance may not either, depending on the policy. Before finalizing a sublease, call your insurer and ask two things: does the policy cover damage caused by a subtenant, and does it cover liability for injuries a subtenant or their guests sustain in the unit.
Some policies require you to disclose subletting and add an endorsement. Others exclude subletting entirely, which means you need a separate or upgraded policy. The subtenant should carry their own renter’s insurance regardless. It costs little, protects their property, and provides liability coverage your policy will not extend to them. Make it a condition of the sublease.
Assignments are simpler on this front. The assignee becomes the primary tenant and should get their own renter’s policy like any new tenant would. Once the assignment is complete and the release, if you got one, is signed, you can cancel yours.
A Separate Path for Servicemembers
If you are an active-duty servicemember or a dependent, you may not need either option. The Servicemembers Civil Relief Act lets qualifying tenants terminate a residential lease early without penalty. This applies when a servicemember enters military service during the lease term, receives permanent change of station orders, or gets deployment orders for 90 days or more.2Office of the Law Revision Counsel. 50 USC 3955 – Termination of Residential or Motor Vehicle Leases
To use the right, deliver written notice and a copy of the military orders to the landlord. Delivery can be by hand, private carrier, certified mail with return receipt, or electronic means. The landlord cannot charge an early termination penalty, must return the security deposit minus legitimate damage deductions, and must refund prepaid rent that covers periods after termination.2Office of the Law Revision Counsel. 50 USC 3955 – Termination of Residential or Motor Vehicle Leases
The protection extends to joint leases: when the servicemember terminates, a dependent co-signer is released as well. If a servicemember dies during service or suffers a catastrophic injury, the spouse or dependent has one year from that date to terminate under the same rules. These rights cannot be waived in the lease.