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Date Category Description Amount
Pay & tax setup
ItemMonthly Wk 1Wk 2Wk 3Wk 4
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Net Spendable — —— ——
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ExpenseDueMonthly Wk 1Wk 2Wk 3Wk 4
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ExpenseDueBudget Wk 1Wk 2Wk 3Wk 4
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GoalMonthly target Wk 1Wk 2Wk 3Wk 4
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ServiceBillingAmountBill date Mo. equiv.AnnualStatusKeep?
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How contractor taxes work in Montana (2025 figures)
As a self-employed contractor, you pay taxes on your own — no employer withholds for you.
Self-Employment (SE) Tax

Rate: 15.3% on 92.35% of net earnings.

Formula: SE Tax = gross × 0.9235 × 0.153

You can deduct 50% of SE tax from your federal taxable income.

Federal Income Tax (2025 brackets, single filer)
Taxable incomeRate
$0 – $11,92510%
$11,926 – $48,47512%
$48,476 – $103,35022%
$103,351 – $197,30024%
$197,301 – $250,52532%
$250,526 – $626,35035%
Over $626,35037%
Standard deduction: $14,600 (2025 single).
Montana State Income Tax (2025)
Taxable incomeRate
$0 – $21,1004.7%
Over $21,1005.9%
Montana standard deduction: $15,750 (2025 single).
Quarterly estimated payments

Due dates: Q1→Apr 15, Q2→Jun 15, Q3→Sep 15, Q4→Jan 15.

Federal: EFTPS.gov or IRS Direct Pay.

Montana: TAP at dor.mt.gov.