Montana · Business Startup Costs Deduction
Business Startup Costs Deduction in Montana (2026)
Deduct up to $5,000 of business startup costs in the first year, with remainder amortized over 15 years. Montana has a progressive income tax with a top rate of 5.65%, so a Montana filer's combined marginal rate on the next dollar at $60,560 of income is about 16.7% (12% federal + 4.7% MT).
2026 savings example for Montana
Planning estimate for a single filer earning $60,560 (Montana median household income in LevyIO's state dataset) who removes $5,000 from taxable income. Federal tax uses the 2026 IRS brackets after the $16,100 standard deduction; MT tax uses the state brackets in LevyIO's dataset and assumes the state follows the federal treatment.
Estimated total savings
$835
Federal savings
$600
$5,087 → $4,487 · 12% bracket
MT state savings
$235
$2,090 → $1,855 · 4.7% marginal
Combined marginal rate
16.7%
≈ $167 saved per $1,000 deducted
Statutory maximum for this item in LevyIO's dataset: $5,000.
Federal × Montana marginal rates (2026, single)
Gross-income ranges include the federal standard deduction. The MT column is the state marginal rate at the midpoint of each range. The last column is the tax saved per $1,000 deducted at that combined rate.
| Federal bracket | Gross income (single) | MT marginal | Combined | Per $1,000 |
|---|---|---|---|---|
| 10% | $16,100 - $28,500 | 4.7% | 14.7% | $147 |
| 12% | $28,500 - $66,500 | 4.7% | 16.7% | $167 |
| 22% | $66,500 - $121,800 | 5.65% | 27.65% | $277 |
| 24% | $121,800 - $217,875 | 5.65% | 29.65% | $297 |
| 32% | $217,875 - $272,325 | 5.65% | 37.65% | $377 |
| 35% | $272,325 - $656,700 | 5.65% | 40.65% | $407 |
| 37% | Over $656,700 | 5.65% | 42.65% | $427 |
Eligibility & forms
New business owners with startup expenses
- Costs incurred before business begins
- Total startup costs under $50K for full deduction
- Active trade or business
Federal forms: Schedule C, Form 4562
Montana filing notes
Use Montana DOR tax tables before filing, especially if you have long-term capital gains. This calculator models ordinary income and does not split capital gains from wages or other ordinary income.
Common mistakes: Not amortizing costs over $5,000; Including ongoing expenses.
Frequently asked questions
How much can the Business Startup Costs Deduction save a Montana taxpayer in 2026?
In LevyIO's example, a single filer with $60,560 of income (the Montana median household income in our state dataset) who removes $5,000 from taxable income saves about $600 in 2026 federal tax (12% marginal bracket) plus about $235 in Montana tax (4.7% state marginal rate), roughly $835 combined. It is a planning estimate computed from the 2026 IRS brackets and LevyIO's MT bracket data, not a survey figure.
What is the Montana income tax rate for 2026?
Montana has a progressive income tax with a top rate of 5.65%. The MT standard deduction in LevyIO's dataset is $16,100 single / $32,200 married. Two ordinary-income rates to 5.65%. No statewide sales tax. Separate net long-term capital gains rates.
Who qualifies for the Business Startup Costs Deduction in Montana?
New business owners with startup expenses. The federal rules are the same in every state; the requirements are: Costs incurred before business begins; Total startup costs under $50K for full deduction; Active trade or business. Montana filers should confirm on the MT return whether the state follows the federal treatment.
Which forms do I file to claim the Business Startup Costs Deduction?
Federal: Schedule C, Form 4562. Montana: check the Montana Department of Revenue instructions for the matching state schedule. Common mistakes: Not amortizing costs over $5,000; Including ongoing expenses.
Business Startup Costs Deduction in other states
Sources
Reviewed 2026-09-17. Estimates are educational planning figures computed from the IRS 2026 inflation adjustments and LevyIO's state bracket dataset; they are not tax advice.