IT: Montana Individual Income Tax Payment Voucher (Form IT) (Revision)
Montana · Montana DOR · Used for tax years 2024, 2025, 2026
Form IT is Montana’s Individual Income Tax Payment Voucher. It identifies the taxpayer, tax period, payment amount, and whether the payment is for tax due with a return or extension, estimated tax, or an amended return.
Who files this form
Use Form IT when sending a check for Montana individual income tax. The voucher covers:
- Tax due with a return or an extension payment.
- A quarterly estimated tax payment for the current tax year.
- A payment with an amended return.
Payments of $50,000 or more must be made electronically.
What you'll need
For a payment by check, prepare:
- A completed Form IT voucher with your name, phone number, payment type, period ending date, SSN, and amount paid.
- Your check, with your ID and tax year written on the memo line.
- Your tax return, if applicable.
Use a separate voucher for each tax period if paying for multiple periods.
How to file
Pay electronically
Visit Montana TransAction Portal (TAP) to pay for an e-filed or paper-filed return. E-check payments are free; credit or debit card payments have a small fee. Payments of $50,000 or more must be made electronically.
Pay by check
Complete the voucher and mark the box for your payment type. Detach it and mail it with your check and tax return, if applicable, to:
Montana Department of Revenue
PO Box 6309
Helena, MT 59604-6309
Write your ID and tax year on the check memo line. Do not staple or tape the voucher to your check or tax return.
Common mistakes
- Sending a check without the voucher. Send the voucher with your check.
- Leaving your ID or tax year off the check memo line. Include both to help the department apply your payment.
- Using one voucher for multiple tax periods. Use a separate voucher for each period.
- Stapling or taping the voucher to your check or tax return. Do not attach it this way.
- Paying $50,000 or more by check. These payments must be made electronically.
Questions people ask
Can I pay online if I file a paper return?
Yes. TAP accepts payments for both e-filed and paper-filed returns at https://tap.dor.mt.gov.
Is there a fee to pay through TAP?
E-check payments are free. Credit or debit card payments have a small fee.
Which payment box should I mark?
Mark box 1 for current-year tax due with a return or an extension payment, box 2 for a quarterly estimated payment for the current tax year, or box 3 for a payment with an amended return.
Can I use one voucher for several tax periods?
No. Use a separate voucher for each tax period.
What should I write on my check?
Write your ID and tax year on the check memo line, and send the voucher with your check.