Form WT-4A is an agreement between the employee and employer that a lesser amount will be withheld from the employee's wages than is provided for in the Wisconsin income tax withholding tables.
First: you should first determine if your withholding can be reduced a sufficient amount by claiming the maximum number of exemptions allowed on Form WT-4.
Copy to the department: mail another copy to the Department of Revenue within 10 days after the WT-4A is filed with your employer.
Expires: Form WT-4A will expire on April 30, 2027 for 2026 calendar year filers.
| Question | Answer |
|---|---|
| Form Name | Form WT-4A |
| Form Length | 2 pages |
| Fillable? | Yes |
| Fillable fields | 41 |
| Avg. time to fill out | 7 min |
| Edition | 11-25 |
| Where to send | Wis. Dept. of Revenue, PO Box 8906, Madison WI 53708-8906 (a copy of the agreement and the worksheet) |
| Matches the agency's file | Yes, checked October 2, 2026 |
| Other names | WT-4A, WT4A, Form WT4A, Wisconsin WT-4A, Worksheet for Employee Withholding Agreement |
| Official source | Form WT-4A (Rev 11-25), Wisconsin Department of Revenue |
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