Massachusetts Form 10B (RTF) is an income tax form required by the state of Massachusetts. It is used for taxpayers to report their income from various sources, including wages, salaries, pensions, annuities, and capital gains. It is also used to calculate the amount of tax due and complete the Massachusetts resident personal income tax return. There are two types of Massachusetts Form 10B (RTF): Form 10B for individuals and Form 10B-NR for nonresidents.