Why eligibility gets questioned
Credits reduce tax directly, so the IRS and state tax departments look at them closely, and some are reviewed far more often than ordinary deductions. Family credits for individuals frequently turn on facts that are hard to prove from a return alone, such as where a child lived during the year or which relative is entitled to claim them. Business credits, including research and energy-related credits, often turn on whether particular activities or property meet technical definitions. Congress has also expanded, narrowed, or ended a number of credits in recent legislation, and some changes took effect partway through a year. A credit that was available on last year's return may not be available on this one, and the reverse can also be true.
Proving that you met the rules
Qualification is usually shown with records created at the time, not explanations written later. For family credits that can mean school or medical records, leases, or letters showing a child's address. For a research credit it typically means project documentation showing what technical uncertainty was being addressed and how, tied to the wages and costs claimed. For energy-related credits it often means certifications and placed-in-service dates, and some newer credits add rules about labor or about where components came from. Gather what exists now, and do not create backdated documents to fill a gap, because that can turn a credit dispute into something far more serious.
When a credit is disallowed
If the IRS denies a credit, the response depends on the stage: a correspondence request can sometimes be resolved with documents, while an examination report or a notice of deficiency carries its own appeal rights and deadlines. For some refundable family credits, a disallowance found to be reckless or fraudulent can also restrict your ability to claim the credit in later years, which makes the answer more important than the dollar amount suggests. We review the notice, the return, and the evidence of qualification, and tell you which parts look supportable. Where a credit was claimed by mistake, we discuss correcting it and limiting penalty exposure. Where it was claimed correctly, we work on presenting the proof in the form the reviewer will accept.
