If the amount of allowances you are eligible to claim increases, you may file a new W-4 at any time.
Exemption: if you do not expect to owe any Iowa income tax and have a right to a full refund of ALL income tax withheld, enter “EXEMPT”.
Note: entering “EXEMPT” will result in no Iowa Income Tax being withheld; nonresidents may not claim this exemption.
Penalty: if you file as exempt from withholding and incur an income tax liability, you may be subject to a penalty for underpayment of estimated tax.
Filing status: if you select “Married filing jointly” and “Yes” for your spouse having earned income, withholding is calculated as filing status single.
New hires: the Centralized Employee Registry Reporting Form is to be completed by the employer within 15 days of hire.
| Question | Answer |
|---|---|
| Form Name | IA W-4 |
| Form Length | 5 pages |
| Fillable? | Yes |
| Fillable fields | 43 |
| Avg. time to fill out | 8 min |
| Edition | Rev 11/13/2025 |
| Matches the agency's file | Yes, checked October 2, 2026 |
| Other names | IA W-4, IA W4, Iowa W-4, Iowa W4, IA 44-019, 44-019a, Employee Withholding Allowance Certificate |
| Official source | IA W-4 (Rev 11/13/2025), Iowa Department of Revenue |
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