A common filing mistake is forgetting to report all income sources. Banks send 1099-INT for interest, brokers send 1099-B for sales, and businesses issue 1099-NEC for nonemployee compensation. The IRS receives copies of these forms too — a missing 1099 on your return may trigger a notice. Keeping a simple list of expected forms during tax prep reduces the chance that an income source slips through. This question asks which action helps avoid the “missing form” problem.