Explanation · Starting
What records should exist from the first sale?
Keep enough evidence to trace what happened, what was collected or paid, how it reached the books, and why it belongs to the business.
A sale and a bank deposit tell different stories
The first sale creates more than a deposit. The business needs enough information to identify what was sold, what was collected, what fees or taxes were involved, which customer or channel produced the sale, and how the transaction reached the bank and books.
Keep the documents that explain the money
Keep the source document, payment evidence, business purpose, accounting entry, and any connected tax, inventory, payroll, or customer record. The system can be simple. It must still let another person trace a reported amount back to the transaction.
The minimum trail
For a sale, keep the date, amount, item or service, quantity, customer or channel when relevant, payment method, discounts, refunds, taxes collected, processor fees, and invoice or receipt number.
For an expense, keep the vendor, date, amount, what was purchased, business purpose, payment method, approval when one was required, and the invoice or receipt.
For money moved by an owner, label it clearly as an owner contribution, distribution, reimbursement, or another reviewed category. Do not leave it looking like sales or an ordinary expense.
The IRS says supporting documents can include sales slips, paid bills, invoices, receipts, deposit slips, canceled checks, account statements, cash-register records, and credit-card records. It also states that proof of payment alone does not establish that an expense qualifies. The document must help show what occurred and why it belongs to the business.
Keep the original meaning
A bank feed can show that $412.80 left the account. It may not show what was bought, whether part was personal, which location used it, or whether inventory or equipment was acquired. Attach or link the invoice and record the purpose while the transaction is still familiar.
A payment processor may deposit a net amount after fees, refunds, and adjustments. Record the gross sales and the separate deductions when the accounting method and system require them. Do not treat the net deposit as the full story.
Follow a sale into the bank
A business sells $1,000 through an online channel. It collects $88 of sales tax and the processor keeps $32 in fees. The bank receives $1,056.
A usable record connects the order detail, $1,000 sale, $88 collected tax, $32 fee, and $1,056 deposit. Recording only the deposit makes sales too high and hides both the tax liability and processor cost.
The figures below are an illustrative transaction, not a sales-tax rate to apply to your own business.
| Part of the transaction | Amount | What it explains |
|---|---|---|
| Goods or services sold | $1,000 | Sales before the collected tax |
| Tax collected from the customer | $88 | Money collected for the relevant government in this example |
| Total customer payment | $1,088 | The amount paid before the processor takes its fee |
| Processor fee | −$32 | The difference between the customer payment and the deposit |
| Deposit reaching the bank | $1,056 | $1,000 + $88 − $32 |
The deposit is $56 more than the sale, even though the processor charged a fee. That is because the deposit includes the collected tax. The $1,056 is neither sales revenue nor the profit from the order. You still need the costs of providing the goods or service to understand profit.
If the bank instead shows $1,006, do not add a made-up $50 expense to force a match. Check the processor's settlement detail for a refund, adjustment, reserve or different group of transactions. Keep the difference unresolved until the underlying record explains it. A settlement can combine several orders and arrive on a different day from the sales.
When a document is missing
Ask the supplier or platform for a copy while the transaction is still easy to identify. Record what you know, such as the payment date and business purpose, and distinguish that note from an original invoice. Do not invent a receipt or assume that finding a payment makes the tax treatment clear. Ask your accountant how to handle a material unresolved item before relying on the books or filing a return.
Separate businesses and periods
The IRS states that a person operating more than one business should keep a complete and separate set of records for each. Separate records also matter for different legal entities, bank accounts, locations, and reporting periods. A shared folder is not enough if transactions cannot be assigned correctly.
How long to keep records
Retention depends on what the record supports. IRS Publication 583 describes federal limitation periods and gives separate treatment to employment-tax and asset records. Insurance, lenders, contracts, state agencies, and industry rules may require longer retention. Set a reviewed policy rather than deleting records when storage becomes inconvenient.
What to do next
Choose where sales, expenses, payroll, tax, assets, inventory, owner transactions, and source documents will live. Make the person responsible for each record explicit. Reconcile the bank and payment processors at least monthly. Review missing documents before the books are closed.
A routine for the first week
At the end of each selling day, save the sales report and any supporting invoices in the agreed location. Match the processor's settlement to its orders and adjustments, then match the settlement to the bank when it arrives. Keep a short list of unmatched items with an amount, a person following up and a date to check again.
A solo owner may do all of this. With a bookkeeper, agree on who supplies the documents and who investigates differences. Giving someone access to the bank does not automatically give them the explanation for every payment. Review the unresolved list together rather than assuming an imported transaction has been understood.
Source
Internal Revenue Service, Publication 583, Starting a Business and Keeping Records, revised December 2024. Checked September 18, 2026. This article explains a practical starting structure and does not replace requirements that apply to a particular business.