Final answer:
Real estate brokers must report cash payments exceeding $10,000 to the IRS using Form 8300 in order to track and prevent illegal activities.
Step-by-step explanation:
If a real estate broker receives more than $10,000 in cash for a single transaction, then he or she must report it to the IRS on Form 8300. Form 8300 is used to report cash payments received by businesses in excess of $10,000 in a single transaction or related transactions. It helps the IRS track and prevent money laundering and other illegal activities.