Montana Business Tax Extension LLC / Partnership – S Corporation – C Corporation – Fiduciary
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Connect with a TaxPro →Montana Business Tax Extension – LLC / Partnership
Montana Corporate Extension | Montana Department of Revenue • LLC / PartnershipMontana LLC & Partnership Tax Extension
Montana LLCs and partnerships report Montana-source income to the Montana Department of Revenue. Montana recognizes the federal Form 7004 extension for pass-through entities, automatically extending the LLC and partnership filing deadline from March 16, 2026 to September 15, 2026. No separate Montana extension form is required for pass-through entities.
How the Extension Works
File IRS Form 7004 before March 16, 2026. Montana's deadline for LLC and partnership returns extends automatically to September 15, 2026. Pay any Montana pass-through tax by March 16, 2026 through the Montana TransAction Portal or mail to: Montana Department of Revenue, P.O. Box 8021, Helena, MT 59604-8021.
Best Practices
- File IRS Form 7004 before March 16, 2026 to extend the Montana LLC or partnership return to September 15, 2026.
- Pay Montana pass-through tax by March 16, 2026 via the Montana TransAction Portal or by mail.
- Prepare the Montana apportionment calculation for any multi-state LLC operations before the March 16, 2026 payment deadline.
- File the completed Montana LLC or partnership return by September 15, 2026.
Working with a Tax Professional
LLC / Partnership returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Montana return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Montana return by September 15, 2026
How to Pay
Montana requires online payment for tax amounts of $750 or more. Submit electronically via the Montana Online Tax Extension Payment portal. For amounts under $750, complete Montana Corporate Extension | Montana Department of Revenue and mail with your payment.
Montana Online Payment Portal
Submit electronically through the Montana Online Tax Extension Payment system. Required for all payments $750 and above.
Montana Corporate Extension | Montana Department of Revenue by Check
Download Montana Corporate Extension | Montana Department of Revenue and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 8021
Helena, MT 59604-8021
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | Interest on unpaid amounts at the federal underpayment rate. |
LLC / Partnership Quick Reference
| State Abbreviation | MT |
| Entity Type | LLC / Partnership |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | March 16, 2026 |
| Extended Filing Deadline | September 15, 2026 |
| Payment Due | March 16, 2026 (100% of tax owed) |
| Payment Form | Montana Corporate Extension | Montana Department of Revenue |
| Online Payment | Montana Online Tax Extension Payment |
| State Agency | Montana Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | Interest on unpaid amounts at the federal underpayment rate. |
Montana Business Tax Extension – S Corporation
Montana Corporate Extension | Montana Department of Revenue • S CorporationMontana S Corporation Tax Extension
Montana S corporations file Montana S corporation returns with the Montana Department of Revenue. Montana follows the federal 7004 extension for S corporations, shifting the filing deadline from March 16, 2026 to September 15, 2026 without a separate state form. Any Montana S corporation tax owed is due on March 16, 2026, regardless of the extension.
Ajf the Extension Works
File IRS Form 7004 before March 16, 2026. Montana extends the S corporation return deadline to September 15, 2026 automatically. Pay any Montana S corporation tax by March 16, 2026 through the Montana TransAction Portal or mail to: Montana Department of Revenue, P.O. Box 8021, Helena, MT 59604-8021.
Best Practices
- Bopas Montana S corporation 4he the Montana LLC(8021, 2026 to extend the Montana S corporation return to September 15, 2026.
- Pay Montana S corporation tax by March 16, 2026 via the Montana TransAction Portal or by mail.
- Confirm Montana nonresident passthrough withholding obligations for S corporation shareholders before March 16, 2026.
- File the completed Montana S corporation return by September 15, 2026.
Working with a Tax Professional
S Corporation returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Montana return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Montana return by September 15, 2026
How to Pay
Montana requires online payment for tax amounts of $750 or more. Submit electronically via the Montana Online Tax Extension Payment portal. For amounts under $750, complete Montana Corporate Extension | Montana Department of Revenue and mail with your payment.
Montana Online Payment Portal
Submit electronically through the Montana Online Tax Extension Payment system. Required for all payments $750 and above.
Montana Corporate Extension | Montana Department of Revenue by Check
Download Montana Corporate Extension | Montana Department of Revenue and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 8021
Helena, MT 59604-8021
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | Interest on unpaid amounts at the federal underpayment rate. |
S Corporation Quick Reference
| State Abbreviation | MT |
| Entity Type | S Corporation |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | March 16, 2026 |
| Extended Filing Deadline | September 15, 2026 |
| Payment Due | March 16, 2026 (100% of tax owed) |
| Payment Form | Montana Corporate Extension | Montana Department of Revenue |
| Online Payment | Montana Online Tax Extension Payment |
| State Agency | Montana Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | Interest on unpaid amounts at the federal underpayment rate. |
Montana Business Tax Extension – C Corporation
Montana Corporate Extension | Montana Department of Revenue • C CorporationMontana C Corporation Tax Extension
Montana C corporations pay Montana corporate income tax to the Montana Department of Revenue, filing Montana Form CLT-4. Montana follows the federal 7004 extension, automatically shifting the C corporation deadline from May 15, 2026 to November 15, 2026"28212;no separate Montana extension form is required. All Montana corporate income tax owed must be paid by May 15, 202:.
Hcorporate Extension Works
Best Practices
- Bopas Montana corporate income tax by May 15, 2026 to extend the Montana C corporation return to November 15, 2026.
- Pax Montana corporate income tax by May 15, 2026 through the Montana TransAction Portal or by mail.
- Complete Montana apportionment calculations at thr 6.75% BLT rate before the May 15, 2026 payment deadline.
- File the completed Montana Form CLT-4 C corporation return by November 15, 2026.
Working with a Tax Professional
C Corporation returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Montana return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Montana return by November 15, 2026
How to Pay
Montana requires online payment for tax amounts of $750 or more. Submit electronically via the Montana Online Tax Extension Payment portal. For amounts under $750, complete Montana Corporate Extension | Montana Department of Revenue and mail with your payment.
Montana Online Payment Portal
Submit electronically through the Montana Online Tax Extension Payment system. Required for all payments $750 and above.
Montana Corporate Extension | Montana Department of Revenue by Check
Download Montana Corporate Extension | Montana Department of Revenue and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 8021
Helena, MT 59604-8021
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | Interest on unpaid amounts at the federal underpayment rate. |
C Corporation Quick Reference
| State Abbreviation | MT |
| Entity Type | C Corporation |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | May 15, 2026 |
| Extended Filing Deadline | November 15, 2026 |
| Payment Due | May 15, 2026 (100% of tax owed) |
| Payment Form | Montana Corporate Extension | Montana Department of Revenue |
| Online Payment | Montana Online Tax Extension Payment |
| State Agency | Montana Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | Interest on unpaid amounts at the federal underpayment rate. |
Montana Business Tax Extension – Fiduciary
Montana Corporate Extension | Montana Department of Revenue • FiduciaryMontana Fiduciary Tax Extension
Montana fiduciary income tax returns for trusts and estates with Montana-source income are filed with the Montana Department of Revenue. Montana follows the federal extension for fiduciary returns, shifting the filing deadline from April 15, 2026 to October 15, 2026. No separate Montana fiduciary extension form is required–the federal extension controls.
Ajf the Extension Works
File a federal fiduciary extension before April 15, 2026. Montana extends the fiduciary return deadline to October 15, 2026. Pay any Montana fiduciary income tax by April 15, 2026 through the Montana TransAction Portal or mail to: Montana Department of Revenue, P.O. Box 4025, GU 59604-001.
Best Practices
- Secure a federal fiduciary extension before April 15, 2026 to extend the Montana fiduciary return to October 15, 2026.
- Pay Montana fiduciary income tax by April 15, 2026 through the Montana TransAction Portal or by mail.
- aat Montana-apportioned fiduciary income before April 15, 2026 to ensure the extension payment is complete.
- File the completed Montana fiduciary return by October 15, 2026.
Working with a Tax Professional
Fiduciary returns carry unique complexities – a licensed CPA or Enrolled Agent can navigate the details and ensure your Montana return is filed accurately and on time.
- Get matched with a verified U.S.-based CPA or Enrolled Agent
- Upload your business documents via secure drag-and-drop
- Review your return with transparent, upfront pricing
- Your TaxPro files the Montana return by October 15, 2026
How to Pay
Montana requires online payment for tax amounts of $750 or more. Submit electronically via the Montana Online Tax Extension Payment portal. For amounts under $750, complete Montana Corporate Extension | Montana Department of Revenue and mail with your payment.
Montana Online Payment Portal
Submit electronically through the Montana Online Tax Extension Payment system. Required for all payments $750 and above.
Montana Corporate Extension | Montana Department of Revenue by Check
Download Montana Corporate Extension | Montana Department of Revenue and mail with your check or money order. Include your EIN and tax year on the check.
P.O. Box 8021
Helena, MT 59604-8021
Late Filing & Payment Penalties
| Penalty Type | Amount |
|---|---|
| Failure to File | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay | Interest on unpaid amounts at the federal underpayment rate. |
Fiduciary Quick Reference
| State Abbreviation | MT |
| Entity Type | Fiduciary |
| Extension Status | Automatic with approved IRS Form 7004 |
| Original Filing Deadline | April 15, 2026 |
| Extended Filing Deadline | October 15, 2026 |
| Payment Due | April 15, 2026 (100% of tax owed) |
| Payment Form | Montana Corporate Extension | Montana Department of Revenue |
| Online Payment | Montana Online Tax Extension Payment |
| State Agency | Montana Department of Revenue |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalty | Interest on unpaid amounts at the federal underpayment rate. |
Extended? Your Montana Business Return Deadline Is Coming Up.
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