Month-to-Month or Fixed Term?

You have a tenant lined up and one decision left. Does the lease run for a set period, ending on a date you both agree now, or does it simply continue month by month until somebody ends it?

Both are common and both are legal. The difference is how much flexibility and how much certainty each one gives you, and how much it gives your tenant.

Deciding Nothing Is Also a Decision

Arizona has an answer ready if your agreement does not give one. Where no definite length is fixed, the tenancy is month to month, or week to week for a roomer paying weekly rent.

So the choice is not between having a term and not having one. It is between choosing the length yourself and accepting the default Arizona law provides.

That matters, because the default is the shorter, looser arrangement. A landlord who meant to have somebody for a year, and never wrote a year down, has a tenancy their tenant can end in thirty days.

What Actually Differs

How Each One Ends

A periodic tenancy ends on written notice. Thirty days for month to month, ten days for week to week. Either of you may give it.

A fixed term ordinarily runs to the end date in the agreement. Neither of you can use the periodic notice rule to end it early for no reason, which is the whole point of agreeing a term.

No reason is required either way. Some reasons are still off limits, because Arizona bars retaliatory terminations and the timing of a notice can be held against you. Two things to read before you send anything: that rule, and the trap in counting the thirty days. Both are on ending a tenancy.

A Fixed Term Is Not as Fixed as It Sounds

This is worth a section of its own, because the folk version of a fixed term is that your tenant owes you every month until the end date whatever happens. That is not what Arizona provides.

Several routes out exist and they override what your lease says.

Domestic violence or sexual assault. A tenant who is the victim of domestic violence, or who was the victim of sexual assault in the property, may end the agreement early on written notice with the documentation the statute lists. They avoid liability for future rent and cannot be charged an early termination fee.

Military service. Federal law gives an active-duty servicemember the right to terminate a residential lease on qualifying orders. That is not Arizona law and your lease cannot contract around it.

Your own material breach. A tenant may terminate for a material noncompliance by the landlord, on written notice specifying the breach, if it is not remedied in ten days. Five days where it materially affects health and safety.

And where a tenant simply leaves, the remaining months are not automatically yours. Arizona puts a mitigation duty on you. After an abandonment you have to try, on reasonable terms, to find a replacement tenant at a fair rental. Succeed, and the old agreement ends when the new tenancy starts. Do not try at all, and it ends on the day you knew about the abandonment. Either way the rest of the term is not money you can sit and wait for. The mechanics are under ending a tenancy.

So a fixed term does buy you more certainty than month to month. What it does not buy is guaranteed rent to the end date. Price it as the first thing rather than the second.

Who the Flexibility Actually Helps

A month-to-month tenancy gives you flexibility, and it gives your tenant exactly the same flexibility.

Your tenant can leave on thirty days, in any month, for any reason at all. Getting thirty days’ notice in June on a property that only leases easily in September is a real cost.

A fixed term buys certainty in both directions. You know the property is occupied until a date. Your tenant knows what they are paying until the same date.

Changing the Rent

Arizona sets no cap on a rent increase. The power to impose one has been taken away from cities and towns, so rent control is not available anywhere in the state for privately owned homes. Publicly owned or subsidized housing follows different rules. What differs between the two arrangements is the mechanism.

Under a fixed term, the rent is whatever the agreement says for as long as the agreement runs. If you want the ability to change it partway through, that has to be in the lease before anyone signs.

Under a periodic tenancy there is no end date to wait for, but you cannot simply announce a new figure. Arizona has no notice rule for a rent increase at all. A month-to-month tenancy runs on its existing terms until you both agree new ones, and where a tenant will not agree, the tool the statute gives you is the one that ends the tenancy. So a rent change is worked around the same thirty days — counted to a rental date, with the same counting trap in it. A new rent effective the 15th is the exact mistake that trap catches. More on this under lease rules.

Can You Change From One to the Other?

An obvious question, and the answer differs by direction.

Month to month to a fixed term. Only by agreement. You cannot impose a term on a tenant who is already in possession; you offer a new lease and they sign it or they do not. If they decline, the month-to-month tenancy continues on its existing terms until one of you ends it.

A fixed term to month to month. This mostly happens by itself. When the end date passes and you consent to your tenant staying, the arrangement continues under the statutory default, which is month to month.

Changing the terms of a periodic tenancy. Worked around the same notice as a rent change, for the same reason.

If a Tenant Stays After a Fixed Term Ends

The end date does not remove anybody. Landlords assume it does, and it does not.

Where your tenant stays without your consent you may bring an action for possession, and a willful holdover carries additional damages. The detail is on ending a tenancy.

Put your consent to them staying in writing and the arrangement carries on under the statutory default terms, which means it becomes month to month. A fixed term that nobody renews and nobody ends tends to drift into a periodic tenancy without either person deciding to.

Which to Choose

There is no general answer. Here is the comparison in one place, and then the situations where each tends to make sense.

A fixed term suits a property you want reliably occupied, a market where leasing again takes time, a tenant you are glad to have, or a first tenancy where predictability is worth more to you than flexibility.

Month to month suits a property you may want to sell or move into, a market where the tenancy is short by its nature, or any situation where you need the flexibility more than the certainty. Seasonal arrangements are covered under seasonal and snowbird leases.

Two things the choice is often presented as, and should not be. It is not a substitute for screening a tenant properly, because once somebody is in possession the same law applies either way. And it is not as stark as it looks, because a fixed term with a renewal clause, or a written rent adjustment at an agreed point, gets you much of the certainty and much of the flexibility at once. That combination is the usual answer in practice.

Whichever you choose, put the length in writing. If the agreement does not fix a definite term, Arizona supplies its own.

Where These Rules Come From

Arizona’s laws are collected in a set called the Arizona Revised Statutes, usually shortened to A.R.S. The number that follows points to one section of it.

You do not need these numbers to use this page. They are here so that you, or a lawyer you hire, can check the exact wording. Each one links to the official text on the Arizona Legislature’s website, which opens in a new tab.

• A.R.S. 33-1314 governs what may go into a rental agreement. Its subsection D supplies the length where the agreement fixes none.
• A.R.S. 33-1375 sets the notice periods for a periodic tenancy, ten days and thirty days, and carries the holdover rule for a tenant who stays on.
• A.R.S. 33-1318 is early termination by a tenant who is a victim of domestic violence, or of sexual assault in the dwelling. It sets out the written notice and the documentation required, and removes liability for future rent and early termination fees.
• A.R.S. 33-1361 allows a tenant to terminate for a material noncompliance by the landlord: ten days’ written notice to remedy, or five where health and safety are materially affected.
• A.R.S. 33-1370 is abandonment. Subsection C is the mitigation duty — reasonable efforts to lease again at a fair rental, and what happens to the agreement if you do not make them.
• A.R.S. 33-1329 is the rent control preemption. Cities and towns have no power to control rents on private residential property. Housing owned, financed, insured or subsidized by a public body is carved out.
• 50 U.S.C. 3955 is federal rather than Arizona law. It gives an active-duty servicemember the right to terminate a residential lease on qualifying orders, and a lease cannot contract around it.