StructureCost2026

LLC or S corp for a accountant in Wisconsin (2026)

A accountant in Wisconsin with $90,000 of profit pays $22,368 a year in tax and fees as a sole proprietor and $23,475 as an LLC taxed as an S corp, with a $63,000 salary. The S corp starts to pay at about $282,500 of profit.

More settings revenue, salary, filing status, payroll costs, PTET

+$1,107 a year

more for an LLC taxed as an S corp than a sole proprietorship in Wisconsin, at these numbers.

Switching from a sole proprietorship to an LLC taxed as an S corp starts to pay at about $282,500 of profit, with the same settings. Setting up costs $130 once in state filing fees.

Wisconsin, 2026: $90,000 profit, single filer

ItemSole propLLC as S corpChange
Self-employment taxirs.gov, 2026 rates$12,717$0−$12,717
Federal income taxirs.gov, 2026 rates$6,599$8,530+$1,931
State income taxrevenue.wi.gov, checked Oct 23, 2026$3,052$3,012−$40
Annual Reportdfi.wi.gov, checked Oct 23, 2026$0$25+$25
Payroll tax on your salaryirs.gov, 2026 rates$0$10,108+$10,108
Payroll service and tax return (estimate)$0$1,800+$1,800
Yearly cost$22,368$23,475+$1,107
What these figures count
  • State income tax, and state taxes on the business itself: franchise, LLC, S corp, gross receipts and excise taxes.
  • Social Security and Medicare on both sides of an owner salary, federal unemployment tax and the state's new-employer rate.
  • The 20% qualified business income deduction with its income limits and the professional-service rule.
  • Yearly report fees, and a cost you can change for payroll and the business tax return.

Many S corp calculators leave out state taxes and the QBI deduction, which can make the election look better than it is.

At three profit levels

ProfitSalary usedSole propLLCLLC as S corpC corp
$60,000$42,000$13,709$13,727$14,396$16,590
$90,000$63,000$22,368$22,384$23,475$27,360
$130,000$84,000$36,533$36,549$36,404$43,645

Salary is the BLS median for the job ($83,680), capped at 70% of profit. Revenue 2.1 times profit. Single filer.

What matters for accountants

What the switch takes in Wisconsin

  1. File the Articles of Organization (Form 502) with the state: $130 (fee).
  2. Get an EIN from the IRS (free, online) and open a business bank account in the new name.
  3. Check the business can elect: no more than 100 shareholders, all of them US citizens or residents (no nonresident alien owners), and one class of stock. IRS
  4. File IRS Form 2553 to elect S corp tax treatment, within 2 months and 15 days of the start of the tax year it should apply to. See how the S corp election works.
  5. Register with Wisconsin as an employer and run payroll for your own salary: federal Forms 941 each quarter, Form 940 and a W-2 each year. New employers pay Wisconsin unemployment tax at 3.05% on the first $14,000 of wages. dwd.wisconsin.gov See what payroll costs.
  6. Federal return each year: Form 1120-S, due March 15, plus your own Form 1040.
  7. State upkeep each year: Annual Report, $25 a year, due End of the calendar quarter in which the LLC was formed. New for you: Wisconsin economic development surcharge (S corporation).

Questions

Should a accountant in Wisconsin form an S corp?

At $90,000 of profit, not on these figures: the S corp costs $1,107 a year more than staying a sole proprietor.

Is an LLC worth it for a accountant in Wisconsin?

For tax, a single-member LLC changes nothing: $22,384 a year against $22,368, the difference being Wisconsin's LLC fees. It separates business liability and is the base for an S corp election.

More

Other professions in Wisconsin
Other states