Montana taxpayers preparing for the upcoming filing season face a streamlined set of requirements for the 2026 tax year, as the state continues efforts to align more closely with federal tax rules while preserving specific local benefits for education savings and military families.
For individuals sitting down to complete their returns in 2027, the changes touch everything from filing status consistency to multi-year loss carryforwards. While state lawmakers have tightened alignment with federal guidelines in several key areas, specific deductions for education and military service remain firmly in place.
Montana Filers Must Match Federal Filing Statuses
One of the most immediate administrative shifts for Montana filers is the requirement for absolute consistency between state and federal returns. Taxpayers must use the exact same filing status on their Montana return as they submit federally.
Single filers must designate themselves as Single in Montana, while married taxpayers filing jointly federally must mirror that choice at the state level. Head of Household and Married Filing Separately statuses follow the exact same rule. This alignment is designed to reduce confusion and streamline the preparation process.
Beyond filing statuses, Montana’s baseline filing requirements now closely mirror federal rules. Anyone required to file a federal income tax return must look to their residency status and Montana-source income to determine if a state return is also mandatory.
Education and Military Subtractions Remain Protected
While general retirement income deductions from past years are gone, families utilizing state savings vehicles will see continued support. Montana keeps its increased subtraction for contributions to qualified 529 and 529A savings plans.
For the 2026 tax year, eligible taxpayers can subtract up to $4,500 per individual, or up to $9,000 for married couples filing jointly. To qualify, contributions must land in an account owned by the taxpayer, their spouse, or a Montana resident child or stepchild.
Military retirees also retain a critical state tax break. Montana continues to provide a subtraction for qualifying military retirement income and survivor benefits. Because state lawmakers previously removed the expiration date for this provision, eligible retirees and survivors can keep claiming the benefit.
Taxpayers Continue Utilizing Remaining Carryforward Amounts
Taxpayers who handled complex loss accounting in previous cycles will find continuity with Net Operating Loss transition adjustments. Individuals who elected Montana’s NOL transition adjustment on their 2024 return can continue utilizing remaining carryforward amounts.
That adjustment was rooted in the difference between federal and Montana NOL amounts as of December 31, 2023, following an election deadline that closed on October 15, 2025. Unused amounts remain available to carry forward for up to seven years, making careful record-keeping essential.
At the same time, taxpayers should note that older state-specific tax breaks remain unavailable. Montana’s former pension, annuity, and IRA income deductions, which existed prior to tax year 2024, stay repealed. Pension, annuity, and traditional IRA distributions are generally taxable to the extent they are taxed at the federal level.
