Filing Ohio City Net Profit Tax Once With the State Instead of City by City

2026-10-15 · RKube Services

Ohio businesses that owe city net profit tax in several municipalities can elect to file one return with the state. Who qualifies, the April 15 opt-in deadline, estimates, Form MNP10 and a Toledo-Columbus example.

Ohio is one of the few states where cities tax business profits. Columbus, Toledo, Cleveland, Cincinnati and hundreds of smaller municipalities each levy their own income tax, and a business that operates in several of them has traditionally filed a separate net profit return with each city, or with the third-party administrator a city uses, such as RITA or CCA.

Since the 2018 tax year there's another way. A business can opt in to have the Ohio Department of Taxation (ODT) administer its municipal net profit tax. One return, one set of estimated payments and one auditor cover every city where the business owes. This guide explains who can elect, the deadline that trips people up, how estimates and returns work once you're in, and how to decide whether it's worth it. The rules come from ODT's Municipal Net Profit Tax page, its information booklet for taxpayers and Ohio Revised Code Chapter 718.

What the election actually does

Under R.C. 718.80, a taxpayer can elect to have the tax commissioner administer its municipal net profit tax. After you opt in, you file your declarations of estimated tax, your payments and your annual return with ODT through the Ohio Business Gateway (OBG), under a menu called ODT Centralized Filing.

The single return lists every municipal corporation where the business is subject to tax. Joint Economic Development Districts (JEDDs) and Joint Economic Development Zones (JEDZs) count as municipal corporations for this purpose, so they go on the same return. ODT then distributes 100% of what it collects to the cities each month, and it handles billing, assessments, collections, audits and appeals for the years you're opted in.

What it doesn't change:

• The tax itself. Each city's rate still applies to the share of profit apportioned to it. Columbus taxes at 2.5% through its Income Tax Division, and Toledo's rate has been 2.5% since January 1, 2021 under Toledo Municipal Code 1905.011.
• Employee withholding. Centralized filing covers the net profit tax only. City withholding on wages still goes to each city or its administrator under the usual rules.
• Earlier years. Tax years before 2018, and any year you weren't opted in, stay with the city or its administrator. You still answer their letters and bills for those years.

Who can elect, and who can't

The election is for businesses that pay municipal net profit tax as an entity: C corporations, and pass-through entities such as partnerships and S corporations, which Ohio cities generally tax at the entity level.

ODT is explicit about who can't opt in:

• Sole proprietors.
• Disregarded entities. That includes a single-member LLC, a qualified subchapter S subsidiary, or any other entity disregarded for federal income tax purposes.

Those businesses keep filing with each municipality. A single-member LLC run by one owner in Columbus, for example, stays with the Columbus Income Tax Division.

You also need a federal Employer Identification Number (FEIN) to register. If you don't have one, ODT asks you to call its Excise and Energy Tax Division at 1-844-238-0403.

The deadline: the 15th day of the fourth month

This is the rule to put on the calendar. The election must be made on or before the 15th day of the fourth month of the taxable year you want it to cover. For a calendar-year business, that's April 15.

So the window for the 2027 tax year closes on April 15, 2027. That's the same day as the first 2027 estimated payment and the 2026 annual return, which is exactly why people miss it.

ODT doesn't bend on this. OBG is programmed not to accept late opt-ins; you get an error and can switch the election to the following year. A late paper registration gets the same treatment: ODT tells you it's invalid for the current year and processes it for the next one.

Two more points:

• Register first. A business that isn't registered with ODT for the municipal net profit tax must register before it files any return or makes any payment. You can register on OBG or with the Municipal Net Profit Tax Registration Form (MNP R). You get an account number right away and a confirmation letter in the mail about 14 days later.
• The election renews itself. It's binding one year at a time, but it automatically renews unless you terminate it. Terminating follows the same deadline: by the 15th day of the fourth month of the year you want to leave.

During registration you're also asked whether ODT may list your company on its public list of opted-in taxpayers. It's optional. Cities use the list to see who has moved to ODT.

Estimated payments once you're in

ODT's estimate rules apply to your combined liability across all your cities.

• Threshold: estimates are required if your estimated combined tax for the year is $200 or more. Under $200, no estimates are required that year.
• Cumulative percentages: 22.5% of the year's estimated tax by the 15th day of the fourth month, 45% by the 15th day of the sixth month, 67.5% by the 15th day of the ninth month and 90% by the 15th day of the twelfth month.
• Calendar-year dates: April 15, June 15, September 15 and December 15.
• Short years: a business with a short taxable year must pay 90% of its combined liability by the 15th day of the twelfth month.

If a due date lands on a weekend or holiday, it moves to the next business day. Underpaying can bring an interest penalty under R.C. 718.88.

Add a city to your next declaration when you start doing business there. ODT also warns against removing a city mid-year unless you expect no tax there for the year.

One cleanup step people forget: if you opted in and then sent an estimate to a city out of habit, ask that city for a refund and send the payment to ODT instead. ODT can only credit and refund money paid to ODT.

The annual return: Form MNP10

The annual return, Form MNP10, is due on the 15th day of the fourth month after the end of your taxable year. For a calendar year that's April 15. Fiscal-year businesses use ODT's month-by-month table.

• Extension: ODT grants an extension of time to file if the request reaches it by the original due date, or if you requested an extension for your federal return. ODT's filing table lists November 15 as the extended due date for calendar-year filers. It's an extension to file, not to pay.
• Payment: send the balance, less estimates already paid, with the return.
• Small balances: when the total tax on the return is $10 or less, no payment is required. The $10 test looks at the combined total, not each city. ODT's booklet gives the example of $5 owed to three cities: that's $15, so a payment is due.
• File anyway: a registered taxpayer files a return even when no payment is due.
• Electronic only: returns and declarations must be filed through OBG, and payments go by ACH debit through OBG or by electronic funds transfer through the Ohio Treasurer of State.

Amended returns are also filed on OBG. An amended return replaces the original and must include every municipality from the original, even ones with no changes.

Refunds work in two ways. An overpayment on an original return can be carried to the next year or refunded with no extra form. An overpayment on an amended return needs an Application for Municipal Net Profit Tax Refund, Form MNP-REF, filed within three years after the tax was paid.

Apportionment: how profit gets split between cities

A business operating in more than one municipality apportions its net profit with a three-factor formula: property, payroll and gross receipts. The share attributed to each city is taxed at that city's rate.

If the formula doesn't fairly reflect your activity in a city, you can request an alternative method, such as separate accounting or adding, dropping or modifying a factor. The request goes in writing with the return, with a timely appeal of an assessment, or with a timely amended return. If OBG can't handle your method, you file on paper with an explanation.

Here's a detail that matters if you have history with a city: ODT's booklet says a formal or informal alternative apportionment agreement you made with a municipality is not binding on the tax commissioner. ODT will treat the city's earlier approval as a significant factor, so bring the paperwork, but it decides each request case by case.

Here's how it works for a company in Toledo, OH and Columbus, OH

Say a distribution company organized as an S corporation has its main office in Toledo and a warehouse in Columbus. It runs on a calendar year and expects $400,000 of net profit in 2027.

Apportionment. Its factors for 2027 come out like this:

Tax. Toledo gets 60% of $400,000, or $240,000, taxed at 2.5% = $6,000. Columbus gets $160,000 at 2.5% = $4,000. Combined liability: $10,000. (This leaves out credits and loss carryforwards to keep the math simple.)

Filing with each city. The company files a Toledo return and a Columbus return, makes estimates to each and answers two sets of notices.

Filing with ODT. To use centralized filing for 2027, it registers on OBG by April 15, 2027. Its cumulative estimates to ODT are:

• April 15, 2027: 22.5% = $2,250
• June 15, 2027: 45% = $4,500 total ($2,250 more)
• September 15, 2027: 67.5% = $6,750 total ($2,250 more)
• December 15, 2027: 90% = $9,000 total ($2,250 more)

The remaining $1,000 goes with the MNP10 by April 15, 2028. ODT splits the money between Toledo and Columbus. Its 2026 return, for a year it didn't opt in, still goes to each city by April 15, 2027.

Now add a third location in a small Lucas County village halfway through the year. With centralized filing, it's one more line on the next declaration and the same return. Filing city by city, it's a new registration, a new return and a new set of estimates.

Is centralized filing worth it?

It tends to make sense when:

• You owe in three or more municipalities, or you keep adding locations.
• You're tired of separate notices, logins and audit requests from each city or administrator.
• Your apportionment is straightforward and you don't rely on a special arrangement with one city.

It makes less sense when:

• You operate in one city only. You're trading one city return for one ODT return, with little gained.
• You have an alternative apportionment agreement with a city that you'd have to defend again with ODT.
• You're a sole proprietor or disregarded entity. You can't elect anyway.

Whichever way you go, keep the property, payroll and receipts records by city. Those three factors drive the tax either way, and they're what any auditor, city or state, asks for first.

Questions Ohio business owners ask

What is the deadline to opt in to Ohio centralized municipal filing? The 15th day of the fourth month of the tax year it should cover. For calendar-year businesses, April 15. For 2027, that's April 15, 2027.

Can a single-member LLC file municipal net profit tax with the state? No. Disregarded entities and sole proprietors aren't eligible and keep filing with each municipality.

Do I have to opt in again every year? No. The election renews automatically until you terminate it by the same 15th-day-of-the-fourth-month deadline.

Does opting in cover my employees' city withholding? No. It covers the net profit tax. Withholding still goes to each city or its administrator.

What if I made an estimate to the city after opting in? Ask the city for a refund and make the payment to ODT. ODT can't credit payments made to a municipality.

When are Ohio municipal estimated payments due? For a calendar year, April 15, June 15, September 15 and December 15, reaching 22.5%, 45%, 67.5% and 90% of the year's tax, when the combined tax is $200 or more.

What is the OH municipal net profit tax return form? Form MNP10, filed on the Ohio Business Gateway under ODT Centralized Filing.

Who do I call with questions? ODT's Excise and Energy Tax Division at 1-844-238-0403, or [email protected].

This guide is general information about the Ohio municipal net profit tax and the ODT centralized filing election as of October 2026, not legal or tax advice for your situation. Rates, credits and apportionment rules vary by municipality, so confirm the details with ODT and each city before you file.

If your receipts are growing too, the state-level gross receipts tax is a separate return: see our guide to the Ohio CAT in 2026. Questions about apportionment or the April 15 election can go to RKube Services at (984) 234-7030.