Default Interest & Late Fees in Michigan Commercial Leases

Unlike residential leasing, where charging an excessive late fee could be deemed unconscionable or retaliatory by a district court judge, commercial landlords in Michigan possess significant latitude to contractually financially penalize business tenants for failing to pay their rent on time.

Because there is no prevailing state statute capping commercial late fees, they are governed almost entirely by the commercial lease agreement and common law contract interpretation.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Commercial rent collection strategies are highly litigious. Always consult a licensed commercial real estate attorney in Michigan for advice specific to your situation. Information last verified: March 2026.

Structuring Enforceable Financial Penalties

To legally and reliably enforce a penalty for late payment in a Michigan eviction proceeding, landlords typically employ two concurrent strategies within the lease agreement: Flat Administrative Fees and Default Interest.

1. Flat Late Fees (Liquidated Damages)

Many commercial leases include a flat fee (e.g., $250) or a percentage fee (e.g., 5% of the base rent) if the rent is not received within a specified "grace period" (typically 3 to 10 days after the due date).

To survive judicial scrutiny in Michigan, this fee must be structured as "Liquidated Damages." Under common law doctrines regarding contracts, this fee must be a reasonable pre-estimate of the actual administrative hassle and financial loss the landlord suffers due to the late payment (e.g., the cost of the property manager hunting down the rent or paying bank overdraft fees).

If a lease specifies rent is $5,000, and the flat late fee is $4,000 applied on the second day of the month, a Michigan judge may strike the clause down as an unenforceable, purely punitive "penalty," regardless of the fact that the corporate tenant agreed to it.

2. Default Interest (Penalty Interest)

To ensure the tenant is highly motivated to pay the debt quickly, most institutional commercial leases implement compounding "Default Interest."

Instead of a flat fee, the lease dictates an incredibly high interest rate on the unpaid balance.

• Example: "Any rent, outgoings, or other sums not paid within five (5) days of the due date shall bear interest at 12% per annum (or the maximum extent permitted by law), calculated daily from the original due date until paid in full."

While 12% to 15% per annum is massive compared to standard bank lending rates, Michigan courts generally accept these high default interest rates as a commercially sensible mechanism to ensure timely debt payment, rather than an illegal penalty.

Defining Late Fees as 'Additional Rent'

A crucial legal maneuver when drafting a Michigan commercial lease regarding late fees or unpaid Triple Net (NNN) outgoings is explicitly defining those charges as "Additional Rent."

If a tenant fails to pay the 12% default interest or the $500 monthly CAM (Common Area Maintenance) charge, the landlord wants to be able to issue a rapid 7-Day Notice to Quit based on the non-payment of rent.

If the lease does not explicitly define those financial penalties as "Additional Rent," the landlord might be required to serve a slower 30-Day Notice to Quit based on a non-monetary "breach of contract," needlessly delaying the commercial eviction process by weeks.

Automating Complex Commercial Arrears

Calculating a compounding 12% per-annum daily interest rate for a corporate tenant who paid their Base Rent on time but is 14 days late paying their NNN property tax reimbursement creates significant friction between property managers and accounting teams. Landager automates these complex commercial ledgers, instantly applying pre-configured default interest rules exactly on the day the grace period expires. By cleanly categorizing these penalties as "Additional Rent," Landager generates mathematically flawless, lease-compliant 7-Day Demand notices without relying on manual spreadsheet calculations.

Back to Michigan Commercial Landlord-Tenant Laws Overview.