How Michigan Calculates Child Support
Michigan uses the Income Shares model to determine child support obligations. This page explains the guidelines, formula, and key factors.
Model Type
Income Shares (Michigan Child Support Formula – MCSF)
Michigan uses the Michigan Child Support Formula (MCSF), an income shares model. Both parents net income is considered. The formula calculates a base support obligation using tables, then allocates proportionally. Parenting-time offset applies based on overnight counts.
Income Basis & Definitions
net income (both parents)
Selects base support from MCSF schedule tables.
Source: MCSF Manual: base support scheduleNet income per MCSF definitions (gross minus taxes and mandatory deductions).
Source: MCSF Manual: net income definitionNet income of the other parent per MCSF definitions.
Source: MCSF Manual: net income definitionParenting Time Handling
Annual overnights for each parent; MCSF applies a parenting-time offset when overnights exceed threshold.
Source: MCSF Manual: parenting-time offset calculationDeductions & Adjustments
Prior or existing support obligations for other children may be deducted.
Source: MCSF Manual: other support obligations adjustment