Resources, worth keeping.

Tax calendar, document checklists, and a short library of articles on the questions clients ask most. Updated through the current tax year.

Key dates

2026 tax calendar.

The dates we work around. Estimated payments, filing deadlines, extension cutoffs. Bookmark this and you'll catch the things that catch most people off guard.

Q1

January – March

  • Jan 15Q4 2025 estimated tax payment
  • Jan 31W-2 & 1099-NEC issued to recipients
  • Mar 15S-corp & partnership returns due (or extension)
Q2

April – June

  • Apr 15Federal & Montana 1040 deadline
  • Apr 15Q1 2026 estimated payment
  • Apr 152025 IRA & HSA contribution cutoff
  • Jun 15Q2 2026 estimated payment
Q3

July – September

  • Sep 15Q3 2026 estimated payment
  • Sep 15Extended S-corp & partnership returns due
  • Sep 30Year-end planning conversations begin
Q4

October – December

  • Oct 15Extended 1040 deadline
  • Dec 31Last day for most deductions
  • Dec 31RMDs & QCDs due
  • Dec 31Roth conversions for 2026
What to bring

Document checklists.

What we'll need from you at your first appointment, depending on the kind of return. Existing clients receive a customized list from their portal.

Individual return

  • Prior year tax return (federal & Montana)
  • All W-2s from each employer
  • All 1099s (NEC, INT, DIV, B, R, MISC)
  • 1098 mortgage interest statement
  • 1098-T tuition statement (if applicable)
  • Property tax bills paid in the tax year
  • Charitable contribution receipts ($250+ requires letter)
  • Investment account year-end statements
  • HSA contribution & distribution records (1099-SA)
  • Notes on significant life changes (marriage, birth, move)

Small business / S-corp

  • Prior year business return (1120-S, 1065, or Sched C)
  • Profit & loss statement for the tax year
  • Balance sheet as of December 31
  • QuickBooks or accounting export (if applicable)
  • Bank & credit card statements (year-end)
  • Payroll summary & W-2s issued
  • 1099-NEC issued to contractors
  • Vehicle log if claiming business use
  • Asset purchases over $2,500 (for depreciation)
  • Loan documents for any business borrowing
Quick answers

Common questions.

What's the difference between an EA and a CPA?

Both are licensed to prepare returns and represent clients before the IRS. CPAs are state-licensed and can also do attest work (audits, reviews) and broader business consulting. Enrolled Agents are federally licensed and specialize specifically in taxation and IRS representation. Daniel is an EA on our team. The other principals are CPAs. For most tax work, either credential is appropriate.

How long should I keep my tax records?

Generally seven years for most documents, indefinitely for records establishing basis in property (home purchase docs, investment cost basis, depreciation schedules). The IRS has three years to audit a return, six years if substantial income was omitted, and unlimited time for fraud. We recommend digital storage in a secure system. We retain client copies for ten years.

Can I deduct my home office?

If you're self-employed or a partner in a partnership, yes, when the space is regularly and exclusively used for business. Employees of W-2 jobs (including those who work from home) cannot deduct a home office on their federal return under current law. Montana follows the federal treatment. We can model whether the simplified or actual-expense method is better for you.

When should I make estimated tax payments?

Generally if you'll owe $1,000 or more at filing and aren't having enough withheld through W-2 income. Self-employed clients and those with significant investment income typically pay quarterly. The four federal deadlines are April 15, June 15, September 15, and January 15. Montana follows the same dates. We calculate these for our planning clients in February each year.

Do I need to file in Montana if I moved here or work remote?

If you established Montana residency during the year, you'll file a part-year resident return. If you live in Montana and work remotely for an out-of-state company, you typically file Montana resident and may need a non-resident return in the other state depending on its rules. Tax situs and residency rules vary considerably by state. We handle multi-state returns regularly.

What's the difference between a tax credit and a tax deduction?

A deduction reduces taxable income. A $1,000 deduction in the 22% bracket saves $220 in federal tax. A credit reduces tax owed dollar-for-dollar. A $1,000 credit saves $1,000. Credits are generally more valuable. Non-refundable credits can only reduce tax to zero. Refundable credits (like the Earned Income Credit) can produce a refund beyond what was withheld.

From the practice

Worth reading.

Short notes we send to clients during planning conversations. Placed here in case they're useful to others. Not legal or specific tax advice.

When does an S-corp election actually make sense?

A walk-through of the reasonable-compensation requirement, the FICA savings math, and the situations where the S-corp election creates more compliance cost than it saves.

Read — coming soon

Roth conversions in the gap years.

The window between retirement and required minimum distributions is often the best opportunity to do Roth conversions at a low marginal rate. How to think about sizing them.

Read — coming soon

Montana property tax basics.

How residential property is assessed, when reappraisals happen, what the 2025 reform changed, and what it means for the federal return.

Read — coming soon

What to do with a $30,000 1099-K from Stripe.

The new 1099-K thresholds have caught a lot of small sellers off guard. What it reports, why it doesn't equal your taxable income, and how to reconcile it cleanly.

Read — coming soon

Schedule F basics for the new rancher.

Cash vs. accrual, livestock depreciation, the deferred crop-insurance rule, and the everyday Schedule F mistakes that come up most often in our practice.

Read — coming soon

1031 exchanges, the short version.

What qualifies, what doesn't, the 45/180 deadlines, and the qualified-intermediary requirement. Plus when you probably don't actually need a 1031.

Read — coming soon
Get in touch

Question we didn't answer?

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