Montana MTAB Income Tax Audit Protest

The situation

William, 61, is a semi-retired engineer who owns a small oil and gas royalty interest in the Williston Basin, partly in North Dakota and partly in Montana. He lives in Bozeman, Montana eight months a year and in Scottsdale, Arizona four months a year. In March 2026 he received an MTDOR determination: "Montana Individual Income Tax: $22,100 (penalty $3,315 + interest $1,700 = $27,115 total), tax period 2022–2024."

The MTDOR auditor assessed Montana income tax on all of William's oil and gas royalties, treating him as a full-year Montana resident (domiciliary), and also asserting that all of his royalty income is Montana-source income regardless of whether the underlying wells are in North Dakota or Montana.

(a) The domicile question and the source question are separate. MTDOR is conflating two distinct issues: (i) whether William is a Montana resident (domicile/residency determination) vs. (ii) whether his North Dakota royalty income is Montana-source income. Even if William IS a Montana domiciliary (which may be correct given his 8-month presence in Bozeman), his North Dakota royalty income is NOT Montana-source income, it's North Dakota-source income sourced to the physical location of the extraction wells. Montana taxes its residents on worldwide income BUT gives a credit for income taxes paid to other states. If William paid North Dakota income tax on his North Dakota royalty income, he may be entitled to a Montana credit that eliminates the Montana tax on that portion.

(b) Montana's ODR is the required first step before MTAB. William must submit his dispute to MTDOR's Office of Dispute Resolution first. Only after ODR issues its final decision does the 30-day MTAB appeal window open.

(c) Crowley Fleck PLLP quoted William $4,500 for "ODR submission, MTAB appeal preparation if needed, and residency/source analysis." The credit for taxes paid to other states + natural resource income sourcing analysis + MTAB petition is largely self-executable with the right Montana-specific structure.

Who receives this

Montana small businesses and high-net-worth individuals receiving MTDOR income tax assessments for disputed residency, natural resource income sourcing, or passthrough entity income allocations. Primary: (1) Montana energy sector royalty recipients (oil/gas, coal, timber) disputing Montana income sourcing of natural resource income; (2) Montana seasonal/part-year residents (Flathead Valley, Bozeman, Big Sky corridor) contesting domicile determinations; (3) Montana S-corp and LLC owners contesting MTDOR's Montana-source income allocation from multi-state businesses.

Why the agency will not advise you

MTDOR cannot advise audit respondents on how to contest its own assessments. The ODR is MTDOR-internal. MTAB is genuinely independent but provides no strategy guidance. Dorsey & Whitney, Crowley Fleck, and Moulton Bellingham are the incumbents ($2,500–$10,000). ezel.ai's generic state income tax protest template doesn't address Montana's ODR-first requirement, natural resource income sourcing, or the credit-for-taxes-paid analysis.

Key facts, with sources

• Montana's income tax audit appeal process has two stages: (1) Office of Dispute Resolution (ODR), an internal MTDOR review step; the ODR issues a 'Final Agency Decision' that affirms or modifies the audit findings; (2) Montana Tax Appeal Board (MTAB), a three-member independent review board, separate from the Department of Revenue, appointed by the Governor for 6-year terms. MTAB has jurisdiction over income, corporate, natural resource, and centrally assessed property tax appeals. The taxpayer must appeal to MTAB within 30 days of receipt of the final ODR decision. If no appeal is filed within 30 days, the ODR decision becomes final. Further appeal from MTAB goes to District Court. MTAB website: mtab.mt.gov; recent MTAB decisions are published there. Source: Montana Tax Appeal Board — mtab.mt.gov · Montana Tax Appeal Board Appeal Process · Montana Tax Appeal Board — MT Governor's Office Board Appointments
• Montana income tax audits most commonly focus on: (1) Residency and domicile, Montana's growing high-income population (Flathead Valley, Bozeman, Whitefish, Big Sky) creates domicile disputes for individuals who claim non-Montana residency while maintaining Montana residences; Montana taxes worldwide income of Montana residents; non-residents are taxed only on Montana-source income; (2) Natural resource income, Montana is a major energy, mining, and timber state; oil and gas royalties, coal royalties, and timber income from Montana-sited resources are Montana-source income regardless of where the recipient lives; MTDOR audits recipients of natural resource royalties for proper Montana income reporting; (3) Passthrough entity income from Montana-based businesses, MTDOR audits S-corp and LLC members for their distributive share of Montana-source income; (4) Montana's 'big income' tax, Montana's top marginal income tax rate is 5.9% (2025), reduced from prior-year rates under ongoing tax reform; multi-year audits cover periods with rate changes. Source: Recent Decisions — Montana Tax Appeal Board

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. Montana Tax Appeal Board — mtab.mt.gov
2. Montana Tax Appeal Board Appeal Process
3. Montana Tax Appeal Board — MT Governor's Office Board Appointments
4. Recent Decisions — Montana Tax Appeal Board