Cash is a valid way to conduct business, but it follows the same tax-reporting principles as a payment by card, check, or transfer. The challenge is keeping convincing records.
1. Do I need to report cash customers pay me?
Generally yes. If you complete work for a customer and receive $800 in cash, the $800 is normally business revenue—even if you don't deposit it, issue an invoice, or receive a Form 1099.
2. Can I deduct cash-paid tools without a receipt?
Potentially. A legitimate expense must still be supported with adequate records or other credible evidence. Try to obtain a receipt or written seller confirmation; keep relevant messages, date, item description, amount, seller details, and business purpose. A handwritten note does not guarantee deductibility. Some larger equipment is subject to depreciation or special expensing rules.
Simple example
| Transaction | Amount |
|---|---|
| Cash received for a repair job | $800 |
| Eligible tools bought with cash | −$150 |
| Preliminary business profit | $650 |
Record $800 gross revenue and $150 expenses, not just a net $650 sale.
3. What if I spend cash without putting it in the bank?
Suppose a customer pays $500 cash and you immediately use $100 to buy legitimate supplies. Your books should generally show $500 of revenue and $100 of expenses. Whether the cash was deposited doesn't change the character of the transaction.
4. Common mistakes and misunderstandings
- “No 1099 means cash is tax-free.” Incorrect.
- “No paper receipt always means zero deduction.” Not automatically, but adequate substantiation is still required.
- “The IRS cannot verify cash transactions.” Business records, customers, deposits, and purchases can provide evidence.
- “I report cash left after expenses as total sales.” Generally you must show gross revenue separately.
- “I used my personal cash, so business supplies can't be deducted.” Payment source alone doesn't prevent a legitimate expense.
- “Any cash deposited in my business account is taxable sales.” Documented owner contributions or genuine loan proceeds aren't automatically sales.
5. Washington business reporting and large transactions
Cash business receipts generally count in applicable Washington gross receipts reporting; regular operating expenses are not automatically deductible from the Washington B&O base. Separately, a business receiving more than $10,000 in cash in one or related transactions may have Form 8300 reporting duties.
6. What to bring to your tax preparer
Prepare a record of all cash received, cash-paid expenses, receipts or other evidence, owner transfers, and large tools/equipment. Clearly distinguish business sales, loans, and transfers between your own accounts.
Official references: IRS Publication 583 · IRS Publication 334 · Form 8300.