This publication explains the Montana pay-as-you-go system, which includes taxes and estimated taxes.
The publication provides information on withholding:
- Mineral royalties, and
- Pass-through income.
Information on Form MW-4
- Montana Publication 1 contains additional information about the new Montana Employee’s Withholding Allowance and Exemption Certificate (Form MW-4).
- Please refer to the Montana Withholding Tax Guide.
Quarterly Estimated Payments
Publication 1 also explains when individuals, trusts, and estates must make quarterly estimated tax payments.
The Montana Individual Estimated Income Tax Worksheet (Worksheet ESW) and the Estimated Tax Annualization Worksheet (Worksheet ESA)–which can be used to calculate quarterly payments–are included with the publication.
Publication 1 includes updates to the worksheets:
- Worksheet ESW
- Worksheet ESW was redesigned to show each quarterly installment as the sum of the payments that you should have paid by the due date of the installment. That way, if you miss or underpay an installment, or if your situation changes, the worksheet calculates catch-up payments automatically.
- Worksheet ESA
- Worksheet ESA was simplified and can now be used without fist completing Worksheet ESW.
Both worksheets require you to first apply your overpayment from tax year 2018 when determining if any quarterly estimated payments are due for tax year 2019.