How Medicaid income spend-down is calculated
Caseworkers start with gross monthly income from Social Security, pensions, and recurring withdrawals. They subtract allowed deductions such as Medicare Part B premiums, earned income exclusions, and sometimes a small personal needs allowance.
The agency compares net countable income to the MNIL. The difference is excess income. In Pennsylvania, Eleanor in Erie earns $1,050 net after the Part B deduction. Subtract the $425 MNIL and she owes $625 per month in qualifying medical costs, or $3,750 across her six-month budget period.
Michigan runs the same subtraction monthly. Harold in Saginaw shows $1,900 countable income in March 2026. MDHHS subtracts the $1,330 PIL and sets a $570 deductible for that month only. If April income drops to $1,200, the deductible disappears because income fell below the PIL.
Some states annualize or multiply the monthly gap across the full budget window. Always ask your worker for the period start date and whether unused medical bills roll into the next month. Michigan allows certain old bills under BEM 545 rules. Pennsylvania CAOs apply a set deduction order on the MNO worksheet.