Introduction
Federal S corporation status passes income to shareholders. It does not erase every Michigan obligation. A Michigan S corporation can still face an elective entity-level tax, payroll registrations, sales and use tax, and state annual filings.
This guide serves Michigan S corporations, LLCs taxed as S corporations, their shareholders, and multistate businesses. It covers tax treatment, returns, deadlines, estimated payments, records, and related duties.
One timing note: the annual forms discussed here are mostly tax year 2025 forms, filed during 2026. Confirm current forms and dates with the IRS and the Michigan Department of Treasury before filing.
Key Takeaways
- Federal Form 1120-S, K-1s, Michigan income tax, payroll, sales tax, and annual reports are separate filings.
- Ordinary S corps sit outside Michigan CIT but may elect the Flow-Through Entity (FTE) tax.
- Deadlines vary by return and tax year; extensions generally move filing dates, not payment dates.
- Run a 2026 checklist covering federal, Treasury, shareholder, payment, payroll, and annual-report items.
How Michigan Taxes an S Corporation in 2026
Federal pass-through treatment
Under IRS S corporation guidance, income, losses, deductions, and credits generally pass through to shareholders. The corporation files Form 1120-S and issues each shareholder a Schedule K-1. Shareholders report their shares on individual returns.
CIT versus FTE tax
Michigan's standard Corporate Income Tax (CIT) is 6%. The usual filing threshold is Michigan gross receipts of $350,000 or more and liability over $100. Those are not ordinary S corporation triggers. An S corporation classified as an insurance company or financial institution can still be subject to CIT.
The FTE tax is different. It is an elective entity-level tax, open to federal S corporations including LLCs taxed as S corporations.
- 2026 rate: 4.25%
- Base: federal business income adjusted under Michigan rules, apportioned to Michigan. A negative base produces no tax.
- Election: made by electronic payment through Michigan Treasury Online (MTO). There is no paper election.
- Commitment: MCL 206.813 makes the election irrevocable for its year and the next two years.
- Election deadline: last day of the ninth month after year-end (September 30 for calendar-year filers), for tax years beginning in 2024 or later
Older Treasury FAQ language citing an earlier deadline is outdated.
Shareholder effects
Direct and indirect members can receive a refundable credit for FTE tax paid. Individual shareholders report it on Form 6072 (Schedule FTE); indirect members also use Form 6074. If the FTE tax was deducted federally, Michigan requires an addback.
Michigan's 2025 PA 24 decoupling also affects the calculation. It generally begins with tax year 2025 and touches business interest, bonus depreciation, qualified production property, domestic research, and Section 179. Do not copy federal deductions into the Michigan base automatically.
Multistate nexus and sourcing
| Issue | CIT | FTE tax |
|---|---|---|
| Nexus | Physical presence over one day; active solicitation plus $350,000+ Michigan receipts | Physical presence over one day; active solicitation with Michigan-sourced receipts |
| Service sourcing | Where the customer receives the benefit | Income-producing activity; greater-proportion rule if split |
Don't apply CIT's market-based service sourcing to an FTE calculation. House Bill 5484 proposes market-based changes but has not been enacted, so treat it as proposed only.
A four-step decision framework
- Confirm federal classification and a valid S election.
- Assess Michigan activity and nexus.
- Decide whether the FTE election or another state return applies.
- Identify separate registrations triggered by employees, taxable sales, or special activities.
Which Tax Returns and Forms Does a Michigan S Corp File?
The usual filings
| Filing | Form |
|---|---|
| Federal S return | 2025 Form 1120-S with Schedule K-1 |
| FTE annual return | 5772 |
| FTE member information | 5774 |
| FTE estimate penalty calculation | 5798 |
| CIT, only if applicable | 4891 (insurance: 4905; financial institutions: 4908) |
| CIT quarterly estimates | 2026 Form 4913 |
Use the Form 5772 instructions for 2025 returns filed in 2026. Don't treat them as proof of a published 2026 annual form. Fiscal-year filers should check which form year matches their year-end.
Filing through Michigan Treasury Online
FTE returns and payments must go through MTO. Submissions outside it aren't accepted.
- Create a MiLogin account and access MTO.
- Link the business using its FEIN and assigned access rights. A user account alone doesn't grant access to every business.
- Enter the return, avoiding punctuation in member names, which can cause data loss.
- Submit and pay electronically (EFT/eCheck or card).
- Save both the 12-digit return confirmation and the separate payment confirmation. They are different evidence.
Preparation checklist
- Completed federal return and K-1s
- Trial balance, general ledger, balance sheet, and profit-and-loss statement
- Shareholder ownership details
- Michigan receipts and apportionment workpapers
- Payroll records
- Prior-year returns, estimated payments, and Treasury notices
Review workflow
- Reconcile the books to the federal return.
- Reconcile federal figures to the Michigan return.
- Check shareholder allocations against K-1s.
- Review elections and carryforwards.
- Verify signatures or electronic authorization.
- File, then retain final copies and confirmations.
Businesses that want help organizing this work can look at VJM Global. The firm offers accounting, financial reporting, and U.S. tax-compliance support for LLCs, S corporations, and C corporations, including multistate nexus assessments. VJM Global does not claim a Michigan office, and no firm can guarantee a particular tax result.
2026 Filing Deadlines, Estimated Payments, and Extensions
Annual deadlines for 2025 returns filed in 2026
| Return | Calendar-year due date | Fiscal-year rule | Extension |
|---|---|---|---|
| Federal 1120-S | March 16, 2026 | 15th day of third month after year-end | Form 7004, six months |
| Michigan FTE 5772 | March 31, 2026 | Last day of third month | MTO request, six months |
| Michigan CIT (if applicable) | April 30, 2026 | Last day of fourth month | Form 4, eight months |
A federal extension alone doesn't extend a Michigan CIT return. Don't rely on a generic calendar-year example; compute dates from your own year-end.
Estimated payments
Both FTE and CIT estimates are required when expected annual liability exceeds $800.
- FTE (calendar year): April 15, June 15, September 15, and January 15.
- CIT (calendar year): April 15, July 15, October 15, and January 15.
- FTE safe harbor: four timely equal installments totaling the lesser of 90% of current-year or 100% of prior-year liability. A zero prior-year FTE liability isn't automatically safe for first-time electors.
- Election-year relief: estimate penalties generally don't apply before a valid election. Timely payments are required afterward.
Extensions are not payment relief
Federal, FTE, and CIT extensions all extend filing time only. Estimate your balance due, pay it by the original deadline, then file the extension. Michigan can deny an extension request if payment is missing.
Published penalties for CIT and FTE generally run 5% of tax due for the first two months, then 5% per month, capped at 25%, plus interest. An FTE filer making no estimated payments can face a 25% estimate penalty, subject to the election-timing relief above.
Payments and proof
MTO accepts EFT/eCheck and card payments. FTE payments are MTO-only. Save payment receipts, submission acknowledgments, amended-return records, and all Treasury or IRS correspondence together in one folder per tax year.
Other Michigan Compliance Obligations and Recordkeeping
Activity-based obligations
Include only what your activities trigger:
- Withholding: employers required to withhold federal income tax must register and withhold Michigan income tax.
- Unemployment insurance: employers with covered employees register with the Unemployment Insurance Agency through MiUI.
- Sales and use tax: retail sales of tangible personal property may require licensing. S status doesn't replace this.
- Business personal property: 2026 Form 632 was due to the local assessor February 20, 2026, subject to exemption rules.
State annual filings
| Entity | Filing | Due | Fee |
|---|---|---|---|
| Corporation | Annual report | May 15 | $25 |
| LLC | Annual statement | February 15 | $25 |
| PLLC | Annual statement | February 15 | $75 |
Missing these can cost you good standing or lead to administrative dissolution. Corporate late fees rise from $10 to $50, and PLLCs face a $50 late fee.
Payroll and governance controls
- Pay shareholder-employees reasonable compensation before taking distributions. The IRS can recharacterize distributions as wages subject to employment tax.
- Track stock basis. Nondividend distributions above basis can trigger capital gain, and debt basis doesn't shelter them.
- Keep business accounts separate from personal ones.
- Maintain shareholder and board records.
- Keep tax records generally three years, six if omitted income exceeds 25% of reported gross income, and at least four years for employment tax.
Mistakes to catch before filing
- Treating Form 1120-S as if it satisfied Michigan
- Overlooking the FTE election
- Using the wrong tax-year deadline
- Leaving out Michigan-source receipts
- Failing to reconcile K-1 data, or skipping an amended K-1 after corrections
- Missing payroll filings
- Assuming an extension postpones payment
- Submitting FTE items outside MTO
Frequently Asked Questions
What is the due date for Michigan corporate returns?
It depends on the return. For calendar-year 2025, CIT is due April 30, 2026 and FTE is due March 31, 2026. Fiscal-year filers should compute from year-end and check current Treasury instructions.
What kind of tax return for S corp?
The federal return is Form 1120-S, with a Schedule K-1 for each shareholder. Michigan may also require an FTE return (Form 5772) if you elected, or a CIT return if you're a regulated classification.
Who is required to file a Michigan business tax return?
S status alone doesn't decide it. Filing turns on entity classification, Michigan nexus, elections, receipts, employees, and taxable sales.
What is the corporate income tax rate in Michigan?
Standard CIT is 6%, but it isn't a general S corporation tax. The 2026 FTE rate is 4.25%. Confirm the base, credits, and exceptions with Treasury.
Does a Michigan S corporation have to file a state income tax return?
Not automatically a standard CIT return. An electing S corporation files FTE returns, and insurance or financial-institution classifications, payroll, or sales activity can add duties.
What is the Michigan flow-through entity tax for an S corporation?
It's an elective entity-level tax made by electronic payment through MTO, binding for three years. Members receive refundable credits, reported on Schedules FTE and, for tiered entities, 6074.
