4588: Insurance Company Annual Return for Michigan Business and Retaliatory Taxes (2025)
Michigan · Michigan Treasury · Used for tax years 2025
Form 4588 is the 2025 Insurance Company Annual Return for Michigan Business and Retaliatory Taxes. It reports Michigan direct premiums, exemptions, credits, tax liability, payments, and any amount due or overpayment. Foreign and alien insurers also use it to calculate retaliatory
Who files this form
Form 4588 is the 2025 annual return for insurance companies reporting Michigan Business Tax (MBT) and retaliatory taxes.
- Foreign and alien insurers complete lines 30 through 46 for the retaliatory tax calculation.
- Domestic insurers skip those lines and go to line 47.
When it's due
The 2025 return is due March 1, 2026.
What you'll need
Have the information needed for the return ready, including:
- Taxpayer name, address, FEIN or TR Number, and state of incorporation.
- Michigan premium amounts, premiums on policies not taken, returned premiums on canceled policies, annuity receipts, and reinsurance receipts.
- Disability insurance premiums and gross direct premiums received everywhere, for the exemption calculation.
- Amounts paid to the five organizations listed on lines 20a through 20e from January 1 through December 31, 2024, and Michigan examination fees.
- Prior MBT overpayments credited forward, estimated tax payments, and tax paid with an extension request.
If applicable, the return also uses amounts from Forms 4596, 4587, 4974, and 4582. Foreign and alien insurers need the tax, fee, and assessment amounts requested on lines 30 through 46. Include detailed schedules for other fees on line 37 and other assessments on line 42.
For an amended return, have the payment and overpayment amounts from the original and any prior amended returns.
How to file
Complete both pages and sign the taxpayer certification on page 2.
Without payment, mail the return to:
Michigan Department of Treasury
PO Box 30783
Lansing MI 48909
With payment, pay the amount on line 58 and mail the check and return to:
Michigan Department of Treasury
PO Box 30113
Lansing MI 48909
Make the check payable to “State of Michigan.” Print the taxpayer’s FEIN or TR Number, the tax year, and “MBT” on the front of the check. Do not staple the check to the return.
Common mistakes
- Do not enter an amount on line 50. Skip to line 51.
- Complete line 54 only for an amended return. Otherwise, skip from line 53 to line 55.
- Follow each line’s instructions for negative results. Some lines require zero, while lines 55 and 59 must be left blank if the result is less than zero.
- Include the detailed schedules requested for other fees and other assessments on lines 37 and 42.
- Remember to continue to page 2 and sign the return.
- Do not staple your payment check to the return.
Questions people ask
How do I mark an amended return?
Check the amended-return box at the top of page 1. Complete lines 54a through 54c using payments and overpayments from the original and any prior amended returns.
What do columns A and B mean for foreign and alien insurers?
Column A reports burdens the insurer’s state of incorporation would impose on a hypothetical Michigan company doing the same business there. Column B reports actual burdens Michigan imposes on the taxpayer.
Can I request a refund or carry an overpayment forward?
Yes. Line 60 is for the amount of the line 59 overpayment to apply as an estimate for the next MBT tax year. Line 61 is for the amount to be refunded.
Can Treasury discuss my return with my preparer?
You can authorize Treasury to do so by checking the authorization box on page 2.