FormA-115: FormA-115 (2025)
Wisconsin · Wisconsin DOR · Used for tax years 2025
Wisconsin Form A-115 is a voucher for prepaying 2026 individual income tax by mail. It records your identifying information and prepayment amount.
Who files this form
This voucher is for people who choose to prepay 100% of their 2026 Wisconsin income tax by mail. The form also offers an online payment option.
When it's due
For tax year 2026, mail the completed voucher with your prepayment postmarked by December 31, 2025.
Although this form is identified as the 2025 version, its printed heading and payment directions apply to 2026 prepayments.
What you'll need
For a mailed prepayment, complete the voucher and include your payment. The voucher asks for:
- First and last name
- Social Security number
- Home address, including city, state, and ZIP code
- Telephone number
- Prepayment amount
How to file
By mail: To prepay 100% of your 2026 income tax, complete the voucher and send it with your prepayment to:
Wisconsin Department of Revenue
Exceptions Review Unit
PO Box 8903
Madison WI 53708-8903
The envelope must be postmarked by December 31, 2025.
Online payment: You may make your 2026 prepayment by electronic funds transfer using the electronic payment application linked in the form. Select Individual Income Tax as the tax type and W - 200 Prepayment as the payment type.
Common mistakes
- Combining spouses' payments when both need exemption certificates: The form says you must send separate payments for you and your spouse if your spouse also needs an exemption certificate.
Questions people ask
Which tax year is this prepayment for?
The form specifies a prepayment of 2026 income tax.
Can I pay online instead of mailing the voucher?
Yes. The form allows payment by electronic funds transfer through its linked electronic payment application. Choose Individual Income Tax and W - 200 Prepayment.
What happens after my payment is processed?
You will automatically be mailed two copies of Form W-200, Certificate of Exemption from Withholding.
What if my spouse also needs an exemption certificate?
You must send separate payments for yourself and your spouse.