Single Entry Bookkeeping: IRS Rules, Examples, and Setup

What Is Single Entry Bookkeeping and How It Compares to Double Entry

When you start a business, you must decide whether to use a single-entry or a double-entry bookkeeping system. According to IRS Publication 583, the single-entry system is the simplest to maintain and serves as a practical option for people starting a small business. It is based strictly on the income statement, also called the profit or loss statement, where every transaction is recorded one time as an inflow of income or an outflow of expense.

For most small businesses, the business checkbook serves as the main source for entries in the business books. Alongside the checkbook, a standard single-entry system records the flow of income and expenses using a daily summary of cash receipts and monthly summaries of cash receipts and disbursements.

As businesses grow, many switch to double-entry bookkeeping because it provides built-in checks and balances to assure accuracy and control. In a double-entry system, transactions are entered in a journal and posted to ledger accounts with a left side for debits and a right side for credits. Because you record every transaction as a debit entry in one account and a credit entry in another, the system is self-balancing. For example, if you pay $780.00 for rent on October 5, you enter a $780.00 debit to Rent Expense and a $780.00 credit to Cash. After posting to the ledger accounts, total debits must equal total credits. If the amounts do not balance, you have made an error and must find and correct it.

• IRS: Publication 583 (12/2024), Starting a Business and Keeping Records
• IRS: 4.10.3 Examination Techniques

The 7 Records in a Complete Single Entry System and Schedule C Mapping

The IRS recordkeeping guide illustrates a complete single-entry system through the sample records of Henry Brown, the sole proprietor of a small automobile body shop. Henry uses part-time help, keeps no inventory of items held for sale (buying parts on a per-job basis), and uses the cash method of accounting.

• Daily Summary of Cash Receipts: Tracks daily cash sales and accounts for cash at the end of the day over the starting Change and Petty Cash Fund. On January 3, Henry takes his cash sales ($263.60) and sales tax ($4.20) from his cash register tape for total receipts of $267.80. He counts $300.80 in his register ($23.75 in coins, $143.00 in bills, and $134.05 in checks) and adds $17.00 in petty cash slips to get $317.80 in total cash. Subtracting his fixed $50.00 change and petty cash fund ($17.00 in slips plus $33.00 in unspent coins and bills) leaves $267.80 in total cash receipts.
• Monthly Summary of Cash Receipts: Carries daily totals into columns for Day, Net Sales, Sales Tax, Daily Receipts, and Deposit. For January, Henry records $4,865.05 in net sales and $77.51 in sales tax, equaling $4,942.56 in total daily receipts and $4,942.56 in bank deposits. Because he only collected the state sales tax from customers to turn over to the state, he subtracts it to figure net sales and neither includes it in income nor deducts it.
• Check Disbursements Journal: Prenumbered checks drawn on the business checking account are entered here daily in numerical order. Frequent or large expenses get dedicated columns, while rare costs like a $35.00 license fee or $2.00 for postage go under General Accounts. In January, Henry writes checks #74 through #97 totaling $3,478.67, plus a $10.00 bank service charge, for $3,488.67 in total disbursements. Personal withdrawals ($975.00 across 4 checks to himself) go in a Drawing column so they are excluded from business deductions.
• Employee Compensation Record: Tracks hours worked, total pay, withheld deductions, and net pay. Henry's employee worked 40 hours in the period ending January 1 and 40 hours in the period ending January 15 at $6.50 per hour, earning $260.00 per period ($520.00 monthly gross payroll). Henry withheld $32.24 for Social Security, $7.54 for Medicare, $40.00 for federal income tax, and $12.00 for state income tax, leaving $428.22 in net pay.
• Annual Summary: Summarizes monthly net sales and expense category totals for the tax return. For the year, Henry's Annual Summary shows $47,440.95 in cash receipts and 14 expense columns. By our calculation from the Annual Summary table, the 14 expense columns total $23,397.39 for the year, leaving $24,043.56 in net profit before depreciation ($47,440.95 minus $23,397.39).
• Depreciation Worksheet: Tracks business property whose useful life extends substantially beyond the year placed in service. Henry tracks 4 used assets placed in service on January 3 (a $3,000 transmission jack, an $8,000 pickup truck, a $30,000 heavy duty tow truck, and a $4,000 engine hoist) using the modified accelerated cost recovery system (MACRS) to figure $8,601 in total depreciation deductions ($429, $1,600, $6,000, and $572) for Form 4562.
• Bank Reconciliation: Reconciles the checkbook, journals, and monthly bank statement.

• IRS: Publication 583 (12/2024), Starting a Business and Keeping Records
• IRS: 4.10.3 Examination Techniques

How to Reconcile Your Bank Account in a Single Entry System

Because a single-entry system does not have self-balancing debits and credits, reconciling your business checking account every month is your main check against math mistakes and unrecorded fees.

Before you compare your checkbook to the bank statement, verify your own figures. Start with the previous month's ending checkbook balance, add total cash deposited during the month, and subtract total cash disbursements. If the result does not agree with your end-of-month checkbook balance, compare your check stub totals against the 'Amount of Check' column in your Check Disbursements Journal, compare your checkbook deposits against your cash receipt book, and refigure your checkbook running balance.

Once your checkbook and journals agree, reconcile your checkbook with the bank statement using this January 31 example:

• IRS: Publication 583 (12/2024), Starting a Business and Keeping Records
• IRS: 4.10.3 Examination Techniques

Accounting Methods, Supporting Documents, and Retention Rules

You choose an accounting method when you file your first income tax return, and you must use the same accounting method to figure your taxable income and to keep your books. Under the cash method, you report income in the tax year you receive it and usually deduct or capitalize expenses in the tax year you pay them. Under an accrual method, you generally report income in the tax year you earn it and deduct or capitalize expenses in the tax year you incur them. If an inventory is necessary to account for your income, you must generally use an accrual method for purchases and sales, though certain small business taxpayers can use the cash method and account for inventoriable items as non-incidental materials and supplies (see IRS Publication 538). You must generally get IRS approval before changing your accounting method, and if you own more than one business, you must keep a complete and separate set of books and records for each.

Every entry in your books must be backed up by supporting documents, such as sales slips, invoices, deposit slips, and canceled checks, kept in a safe place organized by year and type of income or expense. Proof of payment alone does not establish that you are entitled to a tax deduction, so you must also keep invoices or receipts showing you incurred the cost for business. If you do not have a canceled check, you can prove payment with a highly legible financial account statement. For a check, the statement must show the check number, amount, payee's name, and posting date. For an electronic funds transfer or credit card payment, it must show the amount transferred or charged, the payee's name, and the posting or transaction date.

• IRS: Publication 583 (12/2024), Starting a Business and Keeping Records
• IRS: 4.10.3 Examination Techniques

How the IRS Examines Single Entry Books and Setup Checklist

Under Internal Revenue Manual (IRM) 4.10.3 (August 26, 2025), IRS examiners follow 6 steps when examining a taxpayer's books. First, they determine what manual or computerized single-entry or double-entry books are available. Second, they have the taxpayer explain the system and trace specific items from the initial transaction through reconciliations to the return. Third, they verify the accounting period. Fourth, they verify the accounting method. Fifth, they evaluate internal controls to test whether the books are reliable for direct testing or require formal indirect methods. Sixth, they reconcile the books and bank deposits to the return while investigating non-taxable deposits and large, unusual, or questionable (LUQ) items.

Our team put together this 8-step setup checklist so your single-entry books stay clean and ready for tax time:

• Open a separate business checking account: Use it strictly for business. Write a check payable to yourself for personal withdrawals and log it in a non-deductible Drawing column.
• Deposit all business receipts intact: Deposit all daily cash and check receipts into your business checking account, note the source on the deposit slip, and keep copies.
• Use a fixed petty cash fund: Place a fixed sum (such as $50.00) in petty cash for small purchases, attach receipts to petty cash slips, and write a check to 'Petty Cash' for the exact total of the slips when restoring the fund.
• Keep a Daily and Monthly Summary of Cash Receipts: Record cash sales and sales tax daily, and subtract state sales tax collected from customers to figure monthly net sales.
• Maintain a prenumbered Check Disbursements Journal: Enter checks daily in numerical order with dedicated columns for frequent expenses and a General Accounts column for rare costs.
• Track equipment on a Depreciation Worksheet: Log the acquisition date, cost, business use percentage, and recovery period for assets to complete Form 4562.
• Reconcile your checking account every month: Verify your checkbook math against journal totals, then reconcile against the bank statement.
• Store electronic and paper records for at least 3 years for general income tax records and at least 4 years after the tax becomes due or is paid for employment tax records: Ensure any electronic storage system or software indexes, preserves, and reproduces legible records that reconcile with your return (per Revenue Procedure 97-22 and Revenue Procedure 98-25).

• IRS: 4.10.3 Examination Techniques
• IRS: Publication 583 (12/2024), Starting a Business and Keeping Records

When You Want Someone Else to Handle Your Books and Taxes

Maintaining daily cash summaries, multi-column check journals, and monthly bank reconciliations takes steady discipline. If you prefer to hand off your monthly statements and annual tax returns, our team can take over both your bookkeeping and your year-end filings.

Aldro is the cheapest way to get your business taxes done: $399 flat, with bookkeeping at $20 a month. The flat price covers everything tax for the year (every federal and state or provincial business return: Schedule C, 1065, 1120-S, 1120 and state returns, plus T2 and T1 with T2125 in Canada), the owner's personal return when the business income needs it, extensions and quarterly estimate reminders, and 1099-NEC, T4/T4A and T5018 slips. Bookkeeping covers unlimited bank and card accounts, monthly reconciliation and statements, but not payroll processing or sales-tax filing, and if you are switching from Bench or another service, we start within a week of getting the documents.

• IRS: Publication 583 (12/2024), Starting a Business and Keeping Records
• IRS: 4.10.3 Examination Techniques