Cohabitation and alimony in Tennessee
If your ex is living with someone while collecting alimony, Tennessee law may give you a path to modify it. The case is won or lost on documentation.
What the statute says
Tennessee Code Annotated § 36-5-121 governs alimony. For certain types of alimony, the statute provides that when the recipient lives with a third person, a rebuttable presumption arises that the third person is contributing to the recipient’s support or that the recipient is contributing to the third person’s support, such that the recipient does not need the alimony in the amount awarded. The paying spouse can then seek to modify or terminate the award; the recipient can rebut the presumption with evidence of continued need.
Which alimony types this applies to, and how the presumption plays out, are questions for your attorney. The private detective’s role is to establish the cohabitation fact so convincingly that the presumption arises.
What proves cohabitation
Judges look for a living arrangement, not a boyfriend who visits. Evidence that establishes it:
- Overnights, repeatedly. The third party’s vehicle at the residence late at night and still there in the morning, across many nights over weeks, documented with time-stamped video.
- Domestic routine. Taking out trash, walking the dog, collecting mail, arriving with groceries, leaving for work from the address.
- Keys and access. Entering without knocking; parking in the garage.
- Address use. Vehicle registration, mail, deliveries, voter registration or licensing tied to the address, found through lawful records.
- Public statements. Social-media posts about “our place,” holidays at the home, pets, renovations.
- Shared finances or property revealed in discovery after the pattern is documented.
How we document it
Cohabitation is a pattern case, so it is planned as a series of sessions rather than one night: a mix of late-evening and early-morning observations across weekdays and weekends, usually over several weeks, from lawful public vantage points. Each session is logged and recorded. We identify the third party lawfully and pair the surveillance with records research. The result is a report your attorney can file with a petition to modify, and a private detective who will testify.
We do not use trackers, do not enter property and do not record private conversations. Read why trackers are off the table.
Timing and cost
Because the standard is a living arrangement, a few nights rarely suffice; a disciplined engagement is typically two to four weeks of targeted sessions. Costs follow the number of sessions; see our cost guide. Start before you file the petition, and before the other side has reason to change the pattern.
A typical cohabitation engagement, week by week
| Week | Sessions | Purpose |
|---|---|---|
| 1 | Records pass + 2 late-evening sessions | Identify the third party; establish initial overnight presence |
| 2 | 1 early-morning + 1 weekend session | Confirm the vehicle is there in the morning; domestic routine on weekends |
| 3 | 2 mixed sessions | Pattern across weekdays and weekends; mail, trash, keys, garage |
| 4 | Records follow-up; report | Address ties (registration, licensing); draft for counsel |
Sessions are short and targeted. The goal is a pattern a judge can see at a glance in a table of dates.
What the other side will argue, and how documentation answers it
- “He just visits.” Overnights across weeks, mornings included, answer it.
- “She keeps her own place.” Records show whether that place is occupied, rented out or a mail drop; surveillance of that address can show it empty.
- “He doesn’t contribute financially.” The presumption shifts the burden; the recipient must show continued need. Lifestyle and shared property evidence inform that fight.
- “The private detective trespassed.” Logs and lawful vantage points answer it, which is why method matters.
After the petition
Once a modification petition is filed, the other side knows, and the pattern often changes. That is fine: the documented period before filing is the evidence, and a sudden change after service tends to speak for itself. Counsel will decide whether additional post-filing sessions are useful; often they are not.
Cost and value
A cohabitation engagement is a few weeks of targeted sessions against a retainer. Weigh it against the alimony at stake: a modification that reduces or ends a monthly award is often worth many times the investigation. If the numbers do not justify it, we will say so on the first call, and your attorney can advise on whether a petition is worth filing at all.
Quick reference
| Question | Short answer |
|---|---|
| What law applies? | T.C.A. § 36-5-121 |
| What does cohabitation trigger? | A rebuttable presumption about need, for certain alimony types |
| What proves it? | Overnights across weeks, domestic routine, address ties |
| How long does documentation take? | Typically two to four weeks of targeted sessions |
| Can I use a tracker? | No |
| Who files? | Your attorney, with the report as support |
Why cohabitation cases are won on tables, not video
A judge deciding a modification petition does not want four hours of footage. They want a one-page table: date, time the third party’s vehicle arrived, time it left, what was observed, exhibit number. Twelve rows of that, across four weeks, with a registration tying the third party to the address and a social-media post about ‘our place,’ is a cohabitation case. The video exists to back the table and to answer cross-examination; the table is what persuades.
This is why we plan these engagements as a series of short, logged sessions rather than long stakeouts. It is cheaper, it is clearer and it produces exactly the exhibit a court expects. It is also why clients who ‘just drive by’ rarely build a case: without the log and the independence of the witness, the rows do not hold.
Reading the statute with your attorney
The alimony statute distinguishes among types of alimony, and the cohabitation presumption does not apply to every one of them. It also places the burden differently once the presumption arises, and it interacts with the terms of the original decree and any agreement the parties signed. A family-law attorney will read the decree, identify the alimony type, and tell you whether a modification is available and what the presumption would do for you. The private detective’s part is to make the cohabitation fact unarguable, so that the legal analysis starts from a settled record rather than a dispute about whether the boyfriend ‘really lives there.’
If you are the alimony recipient
The presumption is rebuttable. If you are living with someone and still have genuine need, the question becomes evidence of your finances and the third party’s contributions. Talk to your attorney early; a private detective’s surveillance of you will show what it shows, and the response is about need, not denial.
Questions people ask before they call
For certain alimony types, cohabitation creates a rebuttable presumption that the recipient no longer needs the award in that amount, which the paying spouse can use to seek modification. Your attorney can explain which types.
There is no magic number. Courts look at a pattern that shows a living arrangement. Documented overnights across several weeks, plus domestic routine and address evidence, is the usual standard.
You can, but it will likely be challenged, it may escalate conflict, and it lacks the continuity and independence of a licensed private detective’s record.
Shared finances are usually reached through discovery after cohabitation is established; records research can show property and vehicles tied to the address.
Typically two to four weeks of targeted sessions.
Yes.
Services and resources
Talk to a Nashville private detective.
Call 615-977-9929 or email contact@delatorgroup.com. Confidential, no obligation, all 95 Tennessee counties.