- Malware
- Manufactured housing
- Margin
- Marginal tax rate
- Market conditions
- Married filing separately
- Master-planned community
- Material participation
- Maturity
- Maturity date
- McMansion
- Mechanic’s lien
- Median price
- Mediation
- Medicaid
- Medical Information Bureau
- Medical payments coverage
- Medical power of attorney
- Medical savings account
- Medically necessary
- Medicare
- Medicare doughnut hole
- Member bank
- Merit aid
- Mill
- Minimum payment
- Mixed-income housing
- MLS
- Modification
- Money laundering
- Money market
- Money market account
- Money market deposit account (MMDA)
- Money market funds
- Monroney sticker
- Moratorium period
- Mortgage
- Mortgage banker
- Mortgage bond
- Mortgage insurance
- Mortgage interest deduction
- Mortgage life insurance
- Mortgage loan originator
- Mortgagor
- Moving expenses
- MSRP
- Mutual fund