What are the tax rules for a business that takes a lot of cash?

When must a business file Form 8300?

A person in a trade or business that receives cash above the reporting threshold in a single transaction, or in related transactions, must report it on Form 8300. The rule applies to a person in the widest sense: an individual, company, corporation, partnership, association, trust, or estate. It applies where any part of the transaction occurs in one of the fifty states, the District of Columbia, or a US possession or territory.

The report is due within 15 days after the date the cash transaction occurred. It is filed electronically with the Financial Crimes Enforcement Network or, where electronic filing is not required, on paper with the IRS. A business that is already required to file ten or more other information returns of any type during the calendar year must file its Forms 8300 electronically too, and Forms 8300 themselves do not count towards that ten. A copy of each form must be kept for five years, and a confirmation receipt on its own does not meet that recordkeeping requirement.

What written statement goes to the customer?

Filing the form is only half of the obligation. Each party named on a Form 8300 must be given a written statement by January 31 of the year following the reportable transaction. The statement gives the name, address, contact person, and telephone number of the filing business, the aggregate amount of reportable cash received, and a clear indication that the information was furnished to the IRS.

A business that files the form and does not send the statement is subject to penalties for the omission, and those penalty amounts are adjusted for inflation each year. There is one exception worth knowing: where a form is filed voluntarily below the threshold because a transaction appeared suspicious and the corresponding box is marked, the statement is not provided to the person named. Filing below the threshold is voluntary, and the IRS encourages reporting suspicious activity regardless of the amount involved.

What is structuring?

Structuring means deliberately breaking a large cash payment into smaller ones to disguise the true amount of cash involved and keep a report from being filed. The split does not remove the obligation, because related transactions are added together. It is a separate criminal offence, prosecuted independently of any tax question, and it does not become acceptable because the underlying money is clean or the customer asked for it.

The practical guidance is short. Report the transaction as it actually happened, on the form, within the time allowed. A customer who proposes splitting a payment across days or receipts is proposing that the business take on that exposure with them, and no commercial reason makes it worth doing. If a situation is genuinely unclear — related transactions across a period, a mix of cash and other instruments, a deposit against a larger purchase — the question to bring to a CPA is how to report it correctly, not how to avoid reporting it.

Why does a cash business carry a heavier documentation burden?

Not because cash is suspect. Because of who builds the record. A card processor produces a settlement report automatically, tying every sale to a deposit without anyone asking. A cash business has to construct the same evidence by hand, and where it does not, there is simply nothing to point to.

What gets reconciled on an examination is the trail from sales to deposits: daily register or point-of-sale totals, a counted cash sheet signed by the person who counted it, the deposit slip, and the bank statement. Gaps in that chain get interpreted, and the working interpretation is that unexplained deposits are income and undeposited sales were unrecorded. Three habits break the chain more than any others: taking owner draws from the till before the deposit, paying a supplier in cash from the register, and moving money between personal and business accounts without a note of what it was. Each of the three is entirely legitimate when recorded and expensive when not.

The same discipline protects the other side of the return. A business that cannot evidence its revenue rarely gets the benefit of the doubt on its deductions, so a clean daily cash routine is a defence of the expenses as much as of the sales.