Every spring, we see the same pattern. A business owner is ready to file. Revenue was strong. Expenses were tracked. Things feel organized.
Then the email starts.
“Do you have your 1099 from that payment processor?”
“Can you send over your prior year return?”
“Were estimated payments made in September?”
What slows tax preparation down is rarely complexity. It is missing documentation.
The good news is that preparing for tax season does not have to be stressful. When you know exactly what to gather ahead of time, filing becomes a straightforward process instead of a scramble.
This Missoula tax preparation checklist walks Montana business owners through what to collect before filing federal and Montana state taxes, with practical guidance you can use right away.
Start With The Basics: Identification And Entity Information
Before diving into income and expenses, it helps to make sure the foundation is solid. Tax returns are built on accurate identifying information, and small errors at this stage can cause outsized delays later.
Here’s what you’d need to share with your CPA:
- Social Security numbers for you, your spouse, and dependents
- Employer Identification Number for your business
- A copy of your prior year federal and Montana tax returns
- Bank account and routing numbers for direct deposit or payments
- Current address and contact information
The IRS specifically recommends reviewing identifying information carefully before filing. Simple errors in Social Security numbers or EINs are one of the most common reasons returns are delayed.
If you changed business structure, address, or ownership during the year, note that clearly. That context matters and should be communicated upfront.
With those basics confirmed, you can move on to the numbers that drive your return.
Income Documents: Report Everything That Came In
Once identification details are in order, the next step is gathering income documentation. The IRS expects you to report all taxable income, even if you did not receive a form. That is why this section deserves careful attention.
If You Are Also An Employee
Gather all W 2 forms from employers. Even if your business is your primary income, a part time W-2 job must be included on your return. Overlooking a W-2 is one of the quickest ways to receive an IRS notice later.
For Business Owners And Contractors
Collect:
- 1099-NEC forms for contractor income
- 1099-K forms from payment processors
- 1099-MISC forms if applicable
- Year-end sales summaries from Stripe, Square, Shopify, or other platforms
- Interest and dividend statements from business accounts
Keep in mind that 1099-K reporting thresholds have changed in recent years. Even if you do not receive a form, you are still responsible for reporting gross income reflected in your accounting system.
A good practice is to compare your 1099 totals against your bookkeeping revenue reports. Differences should be reconciled before filing, not after.
Once income is clearly accounted for, the focus shifts to the records that support it.
Business Financial Statements: Your Tax Return Backbone
Before calculating deductions, make sure your financial statements are complete and accurate. Clean books make tax preparation faster and more reliable.
At minimum, gather:
- Profit and loss statement for the full year
- Balance sheet as of December 31
- General ledger detail if available
These reports should come directly from your accounting software. If your books are not finalized, that step should happen before preparing the return.
A tax return is built from your financial statements. If the reports are incomplete or inaccurate, the tax return will reflect those gaps.
With reliable financial statements in place, you can confidently move into documenting deductions.
Expense And Deduction Documentation
Deductions reduce taxable income, but they must be supported. This is where organization pays off.
Collect documentation for:
- Office rent and utilities
- Supplies and software subscriptions
- Marketing and advertising
- Insurance premiums
- Professional fees
- Travel and meals related to business
- Equipment purchases
- Payroll expenses and contractor payments
Bank and credit card statements help verify totals, but receipts provide stronger support if the IRS or Montana Department of Revenue requests substantiation.
If you track mileage, gather your mileage logs. If you claim a home office deduction, have square footage calculations and expense allocation details ready.
Being proactive here reduces audit risk and ensures you are not leaving deductions on the table.
For businesses with employees or contractors, there is an additional layer to review.
Payroll And Contractor Records
If your Missoula business has employees or contractors, payroll documentation deserves its own review.
Have copies of:
- Filed W-2 and W-3 forms
- Filed 1099-NEC forms
- Payroll summaries for the year
- Federal and Montana withholding reports
- Proof of payroll tax payments
Payroll reporting deadlines occur early in the year, often before income tax returns are due. Confirm that all filings were submitted accurately and on time.
Incomplete payroll documentation can create issues at both the federal and state level, so it is worth verifying before your return is prepared.
Beyond payroll, many business owners also need to confirm what has already been paid toward their tax liability.
Estimated Tax Payments
Many Montana business owners are required to make quarterly estimated tax payments. Reviewing these payments before filing helps prevent surprises.
Gather:
- Dates and amounts of all federal estimated payments
- Dates and amounts of all Montana estimated payments
- Confirmation numbers from IRS Direct Pay or EFTPS
- Confirmation from the Montana TransAction Portal
Refer to our handy guide on Montana Small Business Tax Deadlines You Should Know in 2026
At the federal level, estimated payments are generally required if you expect to owe more than $1,000 after withholding and credits. Montana’s threshold is typically $500.
Missing or misapplied estimated payments are one of the most common reasons business owners receive unexpected balances due. Having a clear record of what was paid ensures everything is credited properly.
From there, turn your attention to larger purchases that may affect depreciation.
Asset Purchases And Depreciation
If you purchased equipment, vehicles, or large software systems during the year, gather:
- Purchase invoices
- Date the asset was placed in service
- Financing agreements if applicable
The placed in service date is critical. Depreciation rules depend on when the asset was actually available for use in your business, not simply when it was purchased.
This detail often affects how much of the deduction can be taken in the current year, so clarity here makes a difference.
In addition to assets, retirement and health contributions can also influence your tax outcome.
Retirement Contributions And Health Accounts
If you contributed to:
- SEP IRA
- Solo 401 k
- SIMPLE IRA
- Health Savings Account
Have your retirement contribution records ready. Some retirement contributions can be made up to the tax filing deadline, which creates planning opportunities. However, your tax preparer needs accurate income figures to determine allowable amounts.
With federal considerations addressed, it is important not to overlook state level requirements.
Montana-Specific Considerations
In addition to federal filing requirements, Montana business owners must comply with state rules administered by the Montana Department of Revenue.
Depending on your structure, gather:
- Montana pass-through entity returns if applicable
- State withholding reports
- State tax payment confirmations
- Business registration information
Montana deadlines often align with federal ones, but not always. Reviewing state documentation separately helps prevent oversight.
How Elevated Tax Supports Missoula Business Owners
Preparation is not just about avoiding penalties. Clear records allow for identifying tax savings opportunities, evaluating whether estimated payments were sufficient, and improving cash flow forecasting for the coming year.
At Elevated Tax, we work with business owners across Montana, including right here in Missoula, to provide bookkeeping, tax planning, and CFO level guidance that reflects how your business actually operates.
Our goal is to reduce surprises, improve visibility, and help you make confident decisions before deadlines create pressure.
If you would like a structured review of your books before filing, or want to ensure your tax preparation process is organized and complete, our team is here to help.
Until next time!
