States That Allow or Require Composite Tax Returns

Composite tax returns are available in more than 35 states, letting a partnership, S corporation, or LLC file a single state return and pay income tax on behalf of its nonresident owners instead of requiring each owner to file separately. A handful of states make composite filing mandatory in some situations, and the mechanics, eligibility rules, and financial tradeoffs vary from one jurisdiction to the next. Here is a state-by-state look at composite tax returns, who can join them, and when they help or hurt.

States That Allow Composite Returns

The states below permit pass-through entities to file composite returns for nonresident owners. Some call them group returns or consolidated returns, but the mechanism is the same: one filing, one payment, covering multiple nonresidents.

Nine states impose no individual income tax and therefore have no composite return regime: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.

States That Require Composite Filing

Composite filing is optional in most states. It isn’t in a few.

Iowa requires every pass-through entity with nonresident members to file a composite return and pay Iowa tax on their behalf, unless a specific exemption applies.5Iowa Department of Revenue. 2024 IA PTE-C Iowa Composite Return Instructions Oregon reaches the same result through the owner’s choice: if any nonresident owner asks, the entity must file.11Oregon Administrative Rules. OAR 150-314-0515 – Oregon Composite Tax Return Alabama requires a composite payment on behalf of nonresident members unless the entity elects into the state’s pass-through entity tax regime.1Alabama Department of Revenue. Electing Pass Through Entities

In many other states, “optional” is misleading. If an entity chooses not to file a composite return, it usually has to withhold state tax on each nonresident owner’s distributive share and remit those amounts individually. Most pass-through entities end up doing one or the other rather than nothing at all.

Who Can Be Included

Eligibility rules are broadly similar across states. To join a composite return, an owner generally must meet three conditions: nonresidence in the filing state, no other source of income from that state, and consent to participate.8Montana State Legislature. Montana Code 15-30-3312 – Composite Returns and Tax

The nonresidence rule is strict. Part-year residence typically disqualifies an owner. Wisconsin, for example, bars anyone who is a Wisconsin resident during any portion of the calendar year. The sole-source rule cuts the same way: if the owner has other state-source income from a different business, rental property, or personal services, they generally must file their own nonresident return instead.13Wisconsin Department of Revenue. Composite Returns

Most states allow individuals, and many also allow certain trusts, estates, and disregarded entities. Montana permits foreign C corporations and other pass-through entities to join.8Montana State Legislature. Montana Code 15-30-3312 – Composite Returns and Tax California is narrower, limiting participation to individuals and grantor trusts.2Franchise Tax Board. California Group Nonresident Tax Return Wisconsin generally bars non-individual entities but carves out exceptions for single-member LLCs treated as disregarded entities and certain grantor trusts.13Wisconsin Department of Revenue. Composite Returns

The Financial Tradeoffs

Composite filing costs money. Most states calculate the composite tax at the highest marginal individual rate rather than graduated brackets, so owners whose income would fall into a lower bracket overpay. In high-rate states, the gap can be meaningful.

Participating owners also generally forfeit state-level deductions, credits, and personal exemptions they could claim on an individual nonresident return. Prior-year losses typically cannot be used on a composite return. If the entity is currently generating losses, nonresident owners may be better off filing individually so they can carry those losses forward against future income.

Filing status matters too. An owner filing jointly at the state level might benefit from wider brackets or credits that aren’t available on a composite return. Owners with meaningful distributive shares should compare the composite tax to what they would owe filing individually before opting in.

Composite Returns and the Pass-Through Entity Tax

More than 30 states now offer a pass-through entity tax election, and it is easy to confuse with composite filing. Both involve the entity paying state tax on behalf of its owners. They produce very different federal results.

A composite return is primarily an administrative convenience. The tax the entity pays is treated as though the individual owners paid it, so when owners claim it on their federal returns it flows to Schedule A as an itemized state and local tax deduction, subject to the federal SALT cap. Payments above the cap yield no federal benefit.

The pass-through entity tax was built to work around that cap. When an entity makes the PTET election, the state tax is deducted at the entity level before income flows through to the owners. The deduction reduces entity income rather than appearing as an itemized deduction, so the SALT cap does not apply. That is a federal benefit composite returns cannot match.

In states offering both, entities have to weigh which to use. PTET elections generally benefit all owners, including residents. Composite returns are limited to nonresidents. Alabama waives the composite filing requirement entirely when the entity elects into PTET.1Alabama Department of Revenue. Electing Pass Through Entities In other states, entities may use both mechanisms in parallel for different owner groups.

Filing Mechanics

Preparing a composite return means collecting identifying information for every participating owner: full legal name, current address, and Social Security Number or ITIN. Many states also require signed consent forms authorizing the entity to file and pay tax on the owner’s behalf. Montana’s statute, for one, requires each participant to consent.8Montana State Legislature. Montana Code 15-30-3312 – Composite Returns and Tax

The entity also has to calculate each owner’s distributive share of state-source income. Most states require an accompanying schedule per owner, often modeled on the federal Schedule K-1.

Electronic filing is the standard method, and some states require it. Massachusetts will not process paper filings for returns required to be e-filed.14Massachusetts Department of Revenue. DOR E-filing and Payment Requirements The composite return is typically due on the same date as the entity’s information return, including any extensions.8Montana State Legislature. Montana Code 15-30-3312 – Composite Returns and Tax The full tax is generally due at filing.

Estimated Payments

Several states require quarterly estimated payments for composite filings, mirroring the federal schedule. The federal quarterly deadlines for 2026 fall on April 15, June 15, September 15, and January 15 of the following year, and state deadlines usually track that pattern.

Underpayment carries penalties. Federal safe harbor rules avoid them if you pay at least 90% of the current year’s tax or 100% of the prior year’s tax, rising to 110% when the prior year’s adjusted gross income exceeded $150,000. Most states apply similar thresholds to composite returns, though the specific percentages vary. Confirm your state’s rules before the first quarterly deadline.

When Composite Returns Make Sense

Composite returns work best for entities with many nonresident owners who each have small, straightforward distributive shares from a single state. A real estate fund with 50 nonresident limited partners earning modest income in one state is the classic case: filing 50 individual nonresident returns for a few hundred dollars of tax each is not worth anyone’s time.

They make less sense for owners with large distributive shares who would benefit from graduated rates, owners with state-source losses to carry forward, or owners with deductions and credits available only on an individual return. An owner included on a composite return generally cannot also file an individual nonresident return for the same income in the same state, so the decision locks in the tax treatment for the year.

Entities operating across multiple states usually run this analysis separately for each one. A partnership with income in six states might file composite returns in four, make a PTET election in one, and leave the sixth to individual filings. That mix is where most of the planning value lies, and it is worth revisiting each year as state laws and owner circumstances shift.