Maine's New Pass-Through Entity Tax for 2026: the 7.15% Rate, the 90% Credit, Catch-Up Estimates and the First Return Due March 15, 2027

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Maine's elective pass-through entity tax for 2026: the 7.15% rate, the 90% refundable member credit, who it helps, catch-up estimates in the Maine Tax Portal, and the first e-filed return due March 15, 2027.

Maine was one of the last states without a pass-through entity tax. That changed on April 10, 2026, when the Legislature enacted an elective PTET for tax years beginning on or after January 1, 2026 (P.L. 2025, ch. 650, Pt. N).

If you own part of a Maine LLC taxed as a partnership, or a Maine S corporation, this matters for your 2026 return. The tax is optional, the rate is 7.15%, and owners get back only 90% of what the entity pays. Whether that trade is worth it depends on your federal numbers, not your Maine ones.

There's also a timing problem. The law passed after the first estimate date, and Maine Revenue Services (MRS) said the payment channel wouldn't open until about September. So a calendar-year business that wants to elect for 2026 has catch-up payments to think about, plus a first annual return due Monday, March 15, 2027.

Here's how the Maine PTET works, who it tends to help, and what to do before year end.

What the Maine PTET actually is

A pass-through entity normally pays no income tax itself. Profit flows to the owners, and each owner pays Maine income tax on a personal return (Form 1040ME).

Under the PTET, the entity can elect to pay Maine tax at the entity level instead. According to the August 2026 Maine Tax Alert, the tax equals the distributive share of income of all qualified members, increased by the PTET paid to Maine and similar PTET paid to other states, multiplied by Maine's highest individual rate. That rate excludes the new 2% surcharge on very high incomes. For tax years beginning in 2026 the rate is 7.15%.

Each qualified member can then claim a refundable income tax credit equal to 90% of their share of the PTET paid (36 M.R.S. § 5219-CCC). Refundable means the credit can produce a refund if it's larger than the member's Maine tax.

The election is made year by year. The tax applies to each taxable year the entity elects to be subject to it, so electing for 2026 doesn't lock you in for 2027.

Why anyone would pay a tax and get only 90% back

The reason is federal. Since 2018, individuals who itemize can deduct state and local taxes only up to a cap. IRS Notice 2020-75 confirmed that state income tax paid by a partnership or S corporation at the entity level is deducted by the entity in computing its income, so it doesn't count against an owner's personal cap.

For 2026 the federal cap is higher than it was (about $40,400), but it phases back down toward $10,000 once modified adjusted gross income passes roughly $505,000. Owners who take the standard deduction get no personal deduction for state income tax at all.

So the PTET turns a Maine tax that might be nondeductible into a business deduction on the federal return. The cost is the 10% of the PTET that doesn't come back as a credit. The election makes sense when the federal tax saved is bigger than that 10%.

A worked example

Take a Portland design studio organized as a two-member LLC taxed as a partnership. Both owners are Maine residents and split profit 50/50. The studio expects $400,000 of Maine income for 2026 before any PTET.

Because the tax base adds the PTET back, the studio's PTET is roughly 7.15% of the $400,000, or about $28,600.

  • Maine credit. Each owner gets a refundable credit of 90% of their $14,300 share, or $12,870. Together that's $25,740 back on their 1040ME returns.
  • The 10% not recovered. About $2,860 between them.
  • Federal deduction. The $28,600 comes off the partnership's income on the federal return. If both owners are in the 32% bracket and couldn't otherwise deduct their Maine income tax, that's roughly $9,150 of federal income tax saved.

On those assumptions the studio comes out about $6,300 ahead. Change the facts and the answer changes. If the owners are in the 12% bracket, the federal saving is about $3,430 and the gain shrinks to a few hundred dollars. If they itemize and already deduct their full Maine tax under the cap, the PTET may cost more than it saves.

These are rough figures that ignore the qualified business income deduction, self-employment tax and other interactions. They show the shape of the decision, not your answer.

Who should look hard at the election

The PTET tends to help:

  • Higher-income owners whose modified AGI is above the federal SALT phase-down, where the personal deduction shrinks back toward $10,000.
  • Owners who take the standard deduction, since they get no personal benefit from state income tax today.
  • Multi-owner LLCs and S corps with steady Maine profit, where the dollar amounts justify the extra filings.

It tends to help less, or not at all:

  • Owners in low federal brackets. A 10% or 12% federal rate may not cover the 10% of PTET that isn't refunded.
  • Single-member LLCs taxed as sole proprietorships. They're disregarded for income tax, so there's no pass-through entity return to make the election on.
  • Businesses with losses or thin profit. No income, no PTET, no benefit.
  • Nonresident owners, until you check how their home state treats the Maine credit. Some states give credit for PTET paid elsewhere and some don't.

The law uses the term "qualified members." Before electing, confirm which of your owners qualify, especially if one of them is a corporation, a trust or another partnership.

Estimated payments: the 2026 catch-up

PTET estimates are due on the 15th day of the 4th, 6th, 9th and 13th months after the start of the entity's tax year. For a calendar-year business that means:

| Payment | 2026 calendar-year due date |

|---|---|

| First estimate | April 15, 2026 |

| Second estimate | June 15, 2026 |

| Third estimate | September 15, 2026 |

| Fourth estimate | Friday, January 15, 2027 |

| Annual return + balance | Monday, March 15, 2027 |

The first two dates passed before the law was even in place, or before anyone could pay. MRS said estimated PTET payments for 2026 must be made electronically through the Maine Tax Portal (MTP), which it expected to open in early September 2026, and that previously due estimates may be paid at that time. MRS planned a separate Tax Alert to announce when the portal was ready.

If you're electing for 2026, the practical step is to get current now. Log in to the MTP, confirm the PTET payment option is live for your account, and pay the missed estimates as soon as you can, then put January 15 on the calendar. The alert doesn't say how MRS will treat the early dates for penalty purposes, so don't assume relief. Paying sooner limits any exposure.

Sizing the payments works the same way it does for any estimate: start from net profit on reconciled books, project the rest of the year, and apply 7.15% to the Maine income of your qualified members. Profit on the bank balance is not profit on the books.

Filing the first PTET return

For tax years beginning in 2026, the annual PTET return must be filed electronically through the Maine Tax Portal. There's no paper option. For later years, MRS will also accept it through the federal/state Modernized e-File program.

The return and any balance are due by the 15th day of the 3rd month after the tax year ends. For calendar-year entities, the first one is due Monday, March 15, 2027, the same day as the federal partnership and S corporation returns.

The August alert does not spell out how or when the election itself is made. Watch MRS guidance and the PTET return in the MTP for that detail before you count on the election being in place.

How this fits with 941P-ME withholding

Maine already requires pass-through entities to withhold for nonresident members on Form 941P-ME. Under the 2025 instructions, withholding is generally 7.15% of each nonresident individual member's estimated Maine-source distributive income, with quarterly payments due April 30, July 31, October 31 and January 31. Some entities file a composite return (1040C-ME) instead.

The PTET doesn't automatically replace any of that. The alert is silent on how PTET payments coordinate with 941P-ME withholding, so if you have out-of-state owners, plan for both until MRS says otherwise.

Other Maine changes for 2026 owners

Two more changes show up on the same 2026 returns:

  • A 2% income surcharge on Maine taxable income above $1 million for single filers, $750,000 for married filing separately, and $1.5 million for joint filers and heads of household. MRS revised the 2026 withholding tables and the 1040ES-ME worksheet for it.
  • Service Provider Tax repeal. The 6% Service Provider Tax ended January 1, 2026, and those services (cable and satellite, telecom, fabrication, certain rentals, digital audio and video) now charge 5.5% sales tax, per MRS guidance.

The PTET rate is set without the surcharge, so a high-income owner still pays the 2% personally on the 1040ME.

Year-end checklist for a Maine LLC or S corp

  1. Close the books through September or October and project full-year Maine profit.
  2. Run the PTET math for each owner: 10% of their PTET share versus the federal tax saved at their bracket.
  3. Check each owner's home state if anyone lives outside Maine.
  4. Decide on the 2026 election as a group, and write it down.
  5. If electing, pay the missed estimates in the Maine Tax Portal and calendar January 15, 2027.
  6. Keep 941P-ME withholding current for nonresident members.
  7. Plan the first e-filed PTET return for March 15, 2027.

Quick answers

Is the Maine PTET required?

No. It's elective, year by year. If the entity doesn't elect, owners keep paying Maine tax on their own 1040ME returns as before.

What is the Maine PTET rate for 2026?

7.15%, which is Maine's top individual rate without the 2% surcharge.

How much do owners get back?

A refundable credit of 90% of their share of the PTET paid. The other 10% is the cost of getting a federal entity-level deduction.

Can a single-member LLC elect?

A single-member LLC taxed as a sole proprietorship is disregarded for income tax, so it has no pass-through return to elect on. One that has elected S corporation status is a different case.

When is the first return due?

For calendar-year entities, March 15, 2027, filed electronically through the Maine Tax Portal.

Where RKube fits

We're a bookkeeping, payroll and tax prep firm based in North Carolina, working remotely with small businesses across the US and Canada, including multi-owner LLCs and S corps with Maine income. We keep the books current, run the PTET comparison for each owner before year end, track the estimates, and prepare the business and personal returns from the same numbers.

If you'd like the Maine PTET decision made from real books, start with a free 30-day bookkeeping trial and a short scoping call. Call (984) 234-7030 or visit rkubeservices.com.

This article is general information, not tax or legal advice. Figures are for tax year 2026 and can change as Maine Revenue Services issues more guidance. Check with MRS and the IRS, or talk with a qualified professional, before acting.

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