Montana Income Tax Rates & Brackets (Tax Year 2025 — Filed in 2026)

Remote Workers and Multi-State Taxation

Living in Montana, Working for an Out-of-State Employer

As a Montana resident, you owe Montana income tax on ALL income, regardless of where your employer is located.

What this means:

• Employer location does NOT determine your Montana tax obligation.
• Income from employers in other states is taxable in Montana.
• Montana law requires proper Montana tax withholding for resident employees.
• If your employer does not withhold Montana tax, you are responsible for making estimated tax payments.

Example: A Montana resident working remotely for a California company owes Montana income tax on that income. The resident should ensure Montana withholding is in place by filing Form MW-4 with their employer.

Source: https://revenue.mt.gov/taxes/individual-income-tax/filing-requirements

Working in Montana, Living in Another State

Non-residents who perform work physically in Montana owe Montana income tax on income earned from Montana sources.

Physical Presence Rule: Income is sourced to Montana based on where work is physically performed. Montana does not apply a “convenience of the employer” rule. Non-residents are taxed only on income from work physically performed in Montana.

30-Day Exclusion: Non-residents who earned only wages for services performed in Montana for 30 days or less and worked in more than one state during the tax year are excluded from filing and paying Montana tax. Exclusions apply as described in the filing requirements section of Part 2.

Source: https://revenue.mt.gov/taxes/individual-income-tax/filing-requirements

Interstate Tax Risk Indicator

Remote workers involving Montana commonly encounter dual taxation complications with specific states:

Working with these states requires careful planning:

• New York — Applies convenience of the employer rule; Montana residents working remotely for New York employers may be taxed by both states. Montana does not allow a credit for New York tax on income derived in Montana under a convenience rule.
• California — Aggressive residency audits for extended work periods in California.
• Pennsylvania — Over 200 local income tax jurisdictions that may apply to Montana residents working there.
• Connecticut — Complex credit system for taxes paid to other states.
• Massachusetts — Telecommuter rule enforcement status varies.

Important note on credits: Montana’s credit for taxes paid to another state requires that the income be derived from sources within the other state. If another state taxes a Montana resident’s income under a convenience of the employer rule (where the work is actually performed in Montana), Montana does not allow the credit because the income was derived in Montana, not within the other state.

Source: https://www.revenue.mt.gov/taxes/tax-credits/credit-for-income-tax-paid-to-other-state

“Convenience of the Employer” Rule

Montana does not apply a “convenience of the employer” rule for remote workers. Non-residents are taxed only on income from work physically performed in Montana. If you live in another state and work remotely for a Montana employer, Montana does not tax your income unless you physically perform work in Montana.

Source: https://revenue.mt.gov/taxes/individual-income-tax/filing-requirements

Reciprocal Agreement — North Dakota

Montana has a reciprocal agreement with North Dakota. This agreement applies only to personal services income, including wages, salaries, tips, and commissions.

What reciprocity means:

• Montana residents earning personal services income in North Dakota pay Montana income tax instead of North Dakota income tax.
• North Dakota residents earning personal services income in Montana may be exempt from Montana withholding by completing the Montana Employee Withholding Allowance and Exemption Certificate (Form MW-4) and submitting it to their employer.

Limitations: The reciprocity agreement only covers personal services income. If a Montana or North Dakota resident has other types of income (such as rental income, business income, or investment income) sourced to the other state, they may still be required to file and pay income tax in that state.

For North Dakota residents working in Montana: File Form MW-4 with your Montana employer to claim the reciprocity exemption. Forms MW-4 used for North Dakota Reciprocity Exemptions must be submitted to the Montana Department of Revenue by the last day of the payroll period in which you received the form.

Annual Renewal: The exemption requires annual renewal through a new Form MW-4.

If a North Dakota resident’s employer withheld Montana income tax, the employee must file a Montana return to obtain a refund.

On Form 2, North Dakota residents claiming reciprocity should mark the “ND Reciprocity” box in the Residency Status section.

Source: https://revenue.mt.gov/taxes/withholding-tax/north-dakota-reciprocity

Multi-State Tax Filing

When earning income in multiple states:

• File a resident return in Montana (Form 2) reporting all income.
• File non-resident returns in other states where income was earned.
• Claim a credit on your Montana return (Schedule III, Part II) for income taxes paid to other states on income derived from sources within those states.

Forms required:

• Montana Form 2 — resident return
• Schedule III, Part II — Credit for Income Taxes Paid to Another State or Country

The credit is nonrefundable and cannot be carried over to another tax year. The credit is limited to the amount of Montana tax that would be due on the income sourced to the other state.

Source: https://www.revenue.mt.gov/taxes/tax-credits/credit-for-income-tax-paid-to-other-state