Try a lesson.See how it feels.
Read a real passage from Chapter 1, then answer 5 real quiz questions — the same style, tone, and explanations you'll get across all 13 chapters.
Filing status is the single biggest lever on a return. It changes the standard deduction, the tax brackets, the phaseout ranges for almost every credit, and whether the taxpayer even qualifies for benefits like the Earned Income Credit. Get this wrong and the entire return is wrong — even if every number after it is perfect.
The five statuses (Single, MFJ, MFS, HOH, and Qualifying Surviving Spouse) are not chosen freely — the IRS assigns them by rule. Your job as a preparer is to walk down the decision tree in order: marital status on 12/31, then dependents, then who paid more than half the household costs, then the tie-breakers when parents live apart.
Head of Household (HOH) is the most-abused status in the field. Every preparer will see clients try to claim it because 'a friend told them to.' To qualify: the taxpayer must be UNMARRIED (or considered unmarried) on the last day of the year, must have paid more than half the cost of keeping up a home, and must have a qualifying person live with them for more than half the year (a qualifying child, or a qualifying relative dependent). Skipping any one of those three tests is what triggers due-diligence penalties on the preparer.