I.R.S. agent's investigation

AUDIT

Think of a financial review that might be triggered by discrepancies in your tax return, often causing stress for the filer.

An IRS agent is someone who works for the Internal Revenue Service, the U.S. government agency that handles taxes. When they investigate someone’s financial records to check for accuracy or possible fraud, that process is called an "audit." The clue plays on the agent’s role—since their job is to conduct these investigations, the answer fits perfectly.