Wisconsin LLC Filing Requirements — 2026
Step-by-step guide to LLC formation including Wisconsin-specific filing fees, annual reports, and tax obligations.
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Quick Wisconsin Tax Estimate
Based on Wisconsin's tax rates for 2026. Enter your details for a personalized calculation.
State Tax on $80K Profit
$1,726.8
SE Tax
$11,303.64
Effective Rate
22.3%
Marginal Rate
12%
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Wisconsin Tax Information
State Income TaxYes
Top Marginal Rate8%
Sales Tax0%
LLC Filing Fee$0
Annual Report Fee$None
Standard DeductionN/A
Self-employed pay both federal and Wisconsin state tax.
Wisconsin Income Tax Brackets (2026)
| Tax Rate | From | To |
|---|---|---|
| 3.5% | $0 | $14,680 |
| 4.4% | $14,680 | $50,480 |
| 5.3% | $50,480 | $323,290 |
| 7.7% | $323,290 | No limit |
Wisconsin Quarterly Tax Deadlines
Q1
Apr 15
Q2
Jun 16
Q3
Sep 15
Q4
Jan 15
Frequently Asked Questions
How do I form an LLC in Wisconsin?
File Articles of Organization with the Secretary of State, pay the filing fee, designate a registered agent, and create an operating agreement. Processing times range from same-day to 4-6 weeks.
What are the tax benefits of an LLC in Wisconsin?
An LLC provides liability protection. Tax-wise: single-member LLCs are taxed as sole proprietors by default. You can elect S-Corp taxation to potentially save thousands on self-employment tax.
Registered agent requirement in Wisconsin?
All LLCs must maintain a registered agent with a physical address in Wisconsin. You can serve as your own agent or use a professional service ($50-300/year).
Disclaimer:This calculator provides estimates for informational purposes only. It does not constitute tax advice, financial advice, or legal advice. Tax laws change frequently and vary by individual circumstances. Results may not reflect your actual tax liability. Always consult a qualified CPA, tax professional, or financial advisor before making tax decisions. For official tax information, visit IRS.gov.