based on the tax rules/laws, how far back can the IRS return and audit based in quanity of money not accounted for.

U buto pois Camila Cabello has adjusted gross income of $1,000,000 on her 2019 tax return, filed April 15, 2020. She unintentionally failed to include $300,000 that she received for a goggle-box trailer advertisement campaign. How long does the IRS have to audit Camila Cabello's federal tax return