NNN Lease Property Taxes in Maricopa County: What to Check
If you rent industrial, office, or retail space on a triple net (NNN) lease, you pay part of your building’s property tax bill. You probably never see that bill. You see one line on your landlord’s statement, and the county’s version stays in a file you never open.
This year that bill is late. The Maricopa County Treasurer’s Office says the delay comes from last-minute changes to the levy and tax rates, plus trouble rolling out a new computer system. It also says no penalty applies to first-half payments made by 5:00 p.m. on Monday, November 2.
We think the delay does tenants a favor. In a year without changes, asking your landlord for the county bill can feel like second-guessing their numbers. This year, you have a good reason to ask. Everyone’s bill was slow, and you want to see what your charge is based on. Below, we trace how NNN lease property taxes get from the county to you, and what we’d check before paying.
You’re paying part of that bill, so you should get to see it. Any landlord who passes property taxes through to you should be able to show the county bill behind the charge and answer questions about it. Below, we go over how NNN lease property taxes get from the county to you, and what we’d check before paying.
When 2026 Maricopa County Property Taxes Are Due
A late bill would be easier to shrug off if it pushed the due date back. It doesn’t. The dates come straight out of A.R.S. 42-18052. Half the year’s tax is due October 1 and goes delinquent after 5:00 p.m. on November 1.
The other half is due March 1, with the same cutoff at 5:00 p.m. on May 1. Weekends and legal holidays bump a cutoff to 5:00 p.m. the next business day. November 1 falls on a Sunday this year, so the cutoff moved to Monday. Some paper bills won’t show up until after October 1, according to the Treasurer’s Office.
Owners don’t have to wait, though. They can look up the amount due and pay online with the parcel number on the Maricopa County Treasurer’s website.
Reach Out 24/7
Nothing stops a tenant from running the same search. Enter your building’s parcel number, and you’ll see the bill your landlord is using.
When your tax charge shows up depends on how your landlord bills it. Some landlords bill you a monthly estimate all year and square up once the real number arrives. Others sit tight until the county bill lands on their desk. If yours is in the second camp, your statement runs late, along with the county’s. The same thing happens again in the spring with the second half.
How One County Bill Turns Into Your NNN Lease Property Taxes
Say you lease a 6,000-square-foot flex suite in a 48,000-square-foot Deer Valley building. On an NNN lease, base rent only pays for the space. Property taxes, insurance, and common area maintenance (CAM) come to you as separate charges, sized to your slice of the building. If the tenant two doors down is on a gross lease, all of that is already inside their rent, and the landlord writes the check to the county. A modified gross lease could put the tax line on either side, depending on the wording. Not sure which one you signed? Our guide to operating expense pass-throughs compares all three lease types.
The bill takes a short path to your suite. The County Assessor values the parcel, and the Treasurer bills the owner. Your landlord then carves out your share using whatever method your lease spells out.
Square footage is a common one. Your 6,000 square feet is 12.5 percent of the building, so a $48,000 first-half bill puts $6,000 on your statement.
That’s the tidy version. Leases split NNN lease property taxes in plenty of other ways, and a single definition can change what you owe. Pull out your tax clause. Find the sentence that defines real property taxes, and check whether special assessments get swept in with them. Then see how it handles monthly estimates.
On top of your share, you pay tax on your tax. The Arizona Department of Revenue’s commercial lease guidance treats property tax reimbursements as taxable under the transaction privilege tax (TPT). In Phoenix, the combined 3.4 percent rate adds $204 to that $6,000 share. In Peoria, the 2.3 percent rate adds $138. Our Phoenix and Peoria TPT guide has the full 2026 rates.
The Email We’d Send Your Landlord
Before you pay a dollar of NNN lease property taxes, send your landlord a short email asking for four things. The reply also leaves a record in case the statement and the county bill disagree down the road. The reply also leaves a record in case the statement and the county bill disagree down the road.
- The parcel numbers and a copy of each Treasurer bill. One building can span several parcels, and a multi-building complex can share one. You want to know exactly which bills your charge rests on and how the landlord worked out your suite’s share across them.
- The tax year and half the charge covers. Match both to the county bill so an old balance doesn’t ride along.
- Your audit rights. Confirm the lease lets you review the records that support a tax charge, just as it does for other operating expenses.
- Whether the landlord is appealing the valuation. An appeal can change the taxable value your share is based on. The Assessor’s appeal handout covers the steps, and our post on how commercial property gets valued explains where that number starts.
Tenant Questions About NNN Lease Property Taxes
Picture a line on your reconciliation statement labeled “tax interest.” That’s what the county charged your landlord for paying late, and you had nothing to do with it. A.R.S. 42-18053 sets the rate at 16 percent a year and counts a partial month as a whole one, so even a few days late costs a full month of interest. The statute never mentions tenants. Whether that line belongs on your statement comes down to your lease, and if the lease doesn’t clearly put it on you, we’d push back.
Say your landlord budgeted $5,000 for your first-half share and the real number came in at $6,000. That $1,000 shows up on your reconciliation statement, either in one charge or spread out, depending on the lease. The bigger problem is spring. The second half is the same size as the first, so if your monthly estimate stays put, you’re short another $1,000. Ask the landlord to raise the monthly number now.
Possibly. The owner usually files, but the State Board of Equalization also lets the person who controls or possesses the property, or a representative, sign the petition, and that may include you. Read your lease first, since some hand that right to the landlord alone. If you do go ahead, the first deadline is the one that sneaks up on people: 60 days from the Notice of Value mailing to get the commercial Petition for Review (DOR 82130) to the Assessor. A denial gives you 25 days to move it to the State Board of Equalization, and you have 60 days after the last administrative ruling to take it to court. Forms and dates get revised, so check the current instructions before you file.
Say the appeal knocks $4,000 off the building’s tax bill. At 12.5 percent, $500 of that was your money. The county sends the refund to the owner, though, and your $500 only comes back if the lease has a clause crediting tenants their share. Read that clause for appeal costs too, because some landlords take what they spent on the appeal off the top first. No clause at all? Get one into the lease at renewal.
Get Sam Rowe’s Read on Your Lease
Sam Rowe, CNE, Designated Broker at Rowe and Associates, reads the tax and audit language in tenant leases across Deer Valley, Peoria, and North Phoenix. If you’re weighing a new lease or renewal, he’ll also show you how your occupancy costs compare to similar space. See how we handle commercial real estate in Phoenix.
Call (480) 933-0004 or use the contact page. Have the county bill and your latest statement ready.