Report Business Tax Fraud in Detroit, Michigan

Taxation and Finance Michigan 4 Minutes Read · published February 07, 2026 Flag of Michigan

Detroit, Michigan requires accurate reporting and payment of business taxes and assessments. This guide explains how city officials, business owners, and members of the public can report suspected tax fraud or unpaid business taxes in Detroit, how the city enforces obligations, and the practical steps to file a complaint, preserve evidence, and appeal enforcement actions.

When to report suspected tax fraud or unpaid business taxes

Report when you have credible information that a business has underreported gross receipts, concealed taxable activities, failed to remit city business taxes, or otherwise used false records to evade municipal taxes. Collect supporting documents such as invoices, contracts, payroll records, licenses, or bank statements before filing a complaint.

Keep copies of original documents and note dates, contacts, and transaction amounts.

How to file a report

Provide a clear written statement describing the alleged misconduct, identify the business, include relevant dates and documents, and provide your contact information if you are willing to be contacted. Complaints involving municipal tax collection or account questions are handled by the City of Detroit Treasury Department; use the Treasury contact and online pages to submit information or ask how to proceed via official channels City of Detroit Treasury Department[1].

  • Include copies of invoices, contracts, ledgers, or receipts whenever possible.
  • Provide business name, address, tax account number (if known), and names of responsible persons.
  • Give precise dates or tax years when the alleged underreporting occurred.
  • State whether you are reporting anonymously; anonymous reports may limit follow-up.

Penalties & Enforcement

Enforcement of city business taxes and related collection actions is administered by the City of Detroit Treasury Department; the municipal code and Treasury procedures provide the authority for assessment, collection, and remedies. For official contacts and general practices see the Treasury pages and the City Code for controlling ordinances City of Detroit Treasury Department[1] and City of Detroit Code[2].

  • Fines and monetary penalties: not specified on the cited page.
  • Escalation for repeat or continuing offenses: not specified on the cited page.
  • Non-monetary sanctions: administrative assessment, tax liens, levy, seizure of assets, or referral to civil or criminal prosecution (specific remedies depend on ordinance and case facts).
  • Enforcer: City of Detroit Treasury Department and other city enforcement units as authorized by ordinance; investigations may involve coordination with the Law Department.
  • Appeal and review: procedures for protesting assessments or penalties are governed by city code and Treasury rules; specific time limits for appeals are not specified on the cited page.
If you are a reporting witness, do not alter original documents and preserve chain-of-custody details.

Applications & Forms

The City Treasury publishes guidance and contact forms for tax questions and account disputes on its departmental pages; specific complaint forms for reporting suspected fraud are not specified on the cited Treasury page. Contact the Treasury for the current intake method and any required form submissions City of Detroit Treasury Department[1].

Investigation process and what to expect

After a complaint is received, the Treasury or assigned investigators will review documents, request additional records from the business, and may perform audits. Investigations can lead to adjusted assessments, administrative penalties, tax liens, or referral to prosecutors for criminal tax fraud where evidence supports criminal violations. Timelines vary by case complexity; the cited pages do not specify standard case durations.

  • Audits and examinations may be scheduled to review financial records.
  • The city may issue notices of deficiency, assessment, or demand for payment based on findings.
  • Cases with potential criminal conduct may be referred to the city Law Department or to county/state prosecutors.
You may be asked to provide a sworn statement or affidavit during an investigation.

Common violations

  • Underreporting gross receipts or failing to report taxable activity.
  • Failing to obtain or display required business licenses while conducting taxable business.
  • Using false invoices or shell entities to hide receipts.

Action steps for officials and the public

  1. Gather documents and a written summary of the suspected fraud, including dates and amounts.
  2. Contact the City of Detroit Treasury Department to report the matter and ask for the preferred submission method City of Detroit Treasury Department[1].
  3. Preserve evidence and avoid altering originals; provide copies and a chain-of-custody note if possible.
  4. If assessed, follow the city appeal instructions provided with the assessment notice and meet stated deadlines; if not specified, request written appeal deadlines from Treasury.

FAQ

Who enforces city business taxes in Detroit?
The City of Detroit Treasury Department enforces collection and administration of city taxes; specific enforcement authorities are set out in city code and departmental procedures.
Can I report anonymously?
Yes, you can request anonymity, but anonymous reports may limit follow-up or the city’s ability to obtain additional information.
What penalties can a business face?
Penalties may include assessments, interest, administrative fines, liens, seizure, or referral for criminal charges; exact amounts and escalation rules are not specified on the cited pages.

How-To

  1. Identify the business and collect supporting documents, including invoices, contracts, and bank records.
  2. Prepare a concise written statement describing the suspected underreporting or nonpayment, with dates and amounts.
  3. Contact the City of Detroit Treasury Department to submit your complaint and follow the department's instructions for evidence submission City of Detroit Treasury Department[1].
  4. Keep records of all submissions and any case or reference number provided by the city.
  5. If you receive an assessment or enforcement notice, review appeal instructions immediately and request deadlines in writing if they are not provided.

Key Takeaways

  • Report suspected tax fraud with clear documentation to the City Treasury.
  • Treasury handles enforcement; specific fines and appeal time limits are not specified on the cited pages.
  • Preserve originals and submit copies with a written summary to support investigation.

Help and Support / Resources

  1. [1] City of Detroit Treasury Department - official department page
  2. [2] City of Detroit Code - City Clerk official code page

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