Montana S Corporation Tax Filing Checklist for Owners

An S corporation generally files a federal information return each year. The return reports revenue, deductions, assets, liabilities, shareholder activity, and other company information. Although the entity usually does not pay federal income tax in the same way a C corporation does, filing is still required. Each owner receives a Schedule K-1 showing that owner’s share of income, deductions, credits, and other tax items.

A Montana S corporation will generally have a separate state filing requirement as well. Montana may also have special reporting or payment requirements involving nonresident owners, pass-through entity elections, or income earned in more than one state. These details can change the forms and calculations required, so owners should confirm their situation rather than assuming the federal treatment automatically handles everything at the state level.

The owners then use their K-1 information when preparing their individual federal and state returns. This means the S corporation return normally needs to be completed before the shareholders can finish their personal returns. If the business operates or has employees, property, customers, or owners in other states, additional state returns may also be necessary.

Start with a complete profit and loss statement and balance sheet for the tax year. The profit and loss statement should include all business income and expenses. The balance sheet should identify bank accounts, credit cards, loans, equipment, vehicles, payroll liabilities, owner equity, and other year-end balances. Your tax preparer may need both current-year and prior-year reports to identify changes or inconsistencies.

Reconcile every business bank account and credit card through the final statement date of the year. A bookkeeping report is not reliable merely because it looks organized. The ending balances should agree with the financial institution statements, and transfers between accounts should not be recorded as income or expenses. Duplicate transactions, deleted checks, and uncategorized activity should be resolved before tax preparation begins.

Also review payment processor reports from services such as Stripe, Square, PayPal, or online marketplaces. Deposits may be net of processing fees, refunds, chargebacks, or sales taxes. Recording only the bank deposit can understate both gross revenue and expenses. If the business receives information returns reporting payments, compare those forms with the books without automatically adding the reported amount a second time.

An owner who provides substantial services to an S corporation generally cannot take every dollar as a shareholder distribution while avoiding wages. The company should evaluate reasonable compensation based on the owner’s duties, time, experience, industry, location, and the financial condition of the business. There is no universal salary percentage that works for every company.

Gather all quarterly and annual payroll reports, payroll tax payment records, W-2s, and information about any payroll notices. The total wages and payroll taxes in the bookkeeping should agree with the filed payroll reports. Differences can happen when payroll journal entries are missing, payroll liabilities are posted incorrectly, or a payment is recorded entirely as an expense without separating taxes and wages.

Shareholder health insurance also deserves attention. When the company pays or reimburses qualifying health insurance for an owner who meets the applicable ownership rules, special W-2 and tax return reporting may be required. Retirement plan contributions, fringe benefits, personal use of a company vehicle, and other owner benefits should also be reviewed before the final payroll and income tax returns are completed.

Money transferred to an owner is not automatically payroll, a distribution, or a deductible expense. The correct treatment depends on why the payment occurred. Owners should identify transfers made for wages, shareholder distributions, loan repayments, expense reimbursements, or returns of contributed capital. A generic category such as owner draw does not provide enough information for an S corporation return.

Shareholder distributions are generally not deductible by the company. They can also have different tax consequences depending on the shareholder’s stock basis and other circumstances. A distribution that exceeds available basis may create taxable gain. Basis is affected by more than the cash moving through the bank account, so it should be tracked from year to year using prior returns, K-1s, contributions, distributions, income, losses, and qualifying shareholder loan activity.

If an owner paid legitimate company expenses personally, provide receipts and a clear reimbursement report. A properly maintained accountable plan may allow the company to deduct qualifying expenses while reimbursing the owner without treating the payment as wages. Casual transfers or estimates made months later are much harder to support, so reimbursements should be documented consistently throughout the year.

Prepare a list of equipment, vehicles, furniture, computers, improvements, and other significant assets purchased or sold during the year. Include the purchase date, cost, business use, financing details, and a description of the item. Do not simply code every large purchase to supplies. Some purchases must be capitalized and depreciated, while others may qualify for an available expensing election or safe harbor depending on the facts and current law.

For loans, provide year-end statements showing principal balances and interest paid. Loan proceeds are generally not income, and principal payments are generally not deductible expenses. Interest may be deductible, subject to the applicable rules. If an owner loaned money directly to the company, keep a written note, repayment history, and evidence that the transaction was genuinely intended as debt.

Tell your preparer about unusual events such as buying or selling part of a business, admitting a new shareholder, changing ownership percentages, purchasing real estate, receiving debt forgiveness, or disposing of major assets. These transactions can affect basis, depreciation, gain calculations, state filings, and ownership reporting. They should not be left for your preparer to discover from a vague bookkeeping entry.

The Montana income tax filing is separate from the annual report filed with the Montana Secretary of State. Filing one does not satisfy the other. The company may also have payroll withholding, unemployment insurance, local licensing, or industry-specific obligations. A business operating outside Montana should review whether its activities create filing or payroll responsibilities in another state.

Montana pass-through entity rules can affect how state tax is paid and reported for owners. Elections, nonresident ownership, and multistate income can make the state return more complicated. Because these rules and related federal deductions can change, discuss the available options before the return is finalized rather than making an election based only on what another business owner chose.

Do not wait until the individual filing deadline to start the S corporation return. Entity returns commonly have an earlier due date, and the owners need their K-1s to complete their personal filings. If complete records will not be ready, an extension may provide more time to file, but it does not necessarily extend every payment or related filing obligation. Confirm the dates and payment requirements that apply to your company.

This article provides general information and is not tax, legal, or accounting advice for your specific situation. Filing requirements depend on the company’s ownership, operations, payroll, elections, and the states in which it does business.

For help preparing a Montana S corporation return or reviewing your records before filing, call Marlow Accounting at (406) 290-1214 or schedule a free consult with our Billings office.