Credit cards cause more quiet errors in small business books than almost anything else. The most common one doubles your expenses: every purchase gets recorded once from the card, and then again when you pay the card off from checking.
The fix is to treat the card the way an accountant does — as a loan account with its own balance — and to understand what each kind of card transaction actually is.
The card is a liability account, not an expense
Set up each business credit card as its own liability account in your books, and bring in its transactions separately from your bank account. Every purchase is recorded when it happens: the expense category goes up, and the balance you owe on the card goes up by the same amount. A $300 supplies purchase is a $300 supplies expense and $300 more owed on the card.
When you pay the card from checking, that payment is not a new expense. It is a transfer: cash goes down and the card balance goes down. Nothing hits the profit and loss statement, because the expenses were already recorded purchase by purchase.
The double count happens when the payment is also categorized as an expense — often labeled something like "credit card" or dropped into supplies or miscellaneous. An illustrative month: $4,000 of purchases on the card, paid in full from checking. Recorded correctly, expenses are $4,000. With the payment also booked as an expense, they show $8,000, profit is understated by $4,000, and the card's balance in the books drifts further from the statement every month.
Interest, fees, refunds, and rewards
Interest charges are interest expense, and annual fees or late fees are bank or finance charges. Both increase the card balance, so they belong on the card account, not buried in a payment.
A refund or return from a vendor is not income. It reverses the original purchase: it reduces the same expense category the purchase was booked to and reduces the card balance. If you returned $150 of supplies, supplies expense goes down by $150.
Cash back and points are commonly treated as a reduction of what you paid rather than as income, though practice varies with how the rewards are earned and redeemed. Pick one treatment with your accountant and apply it consistently, so rewards neither inflate revenue nor disappear.
When personal and business cards cross
If you put a business expense on a personal card, record the expense in the business books with the owner as the source of the money: either an owner contribution in equity or an amount the business owes you, if it will reimburse you. Do not record the personal card's payment in the business books at all.
If a personal purchase lands on the business card, it is not a business expense. Record it as an owner draw — or, for a corporation, whatever your accountant has you use for owner payments — and ideally stop letting it happen. A business card that is used only for business is far easier to keep straight.
Reconcile the card every month
Once a month, reconcile each card to its statement the same way you would a bank account: the ending balance in your books should match the statement's ending balance, and every charge, payment, and credit should be accounted for. A card balance in the books that is lower than the real statement is the classic sign that payments were booked as expenses.
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