A 60-minute monthly close for owner-operators

Why a monthly close

Big companies close their books every month. Owner-operators usually close once a year, in a panic, with a stack of unexplained transactions. The monthly version is far less painful, and it turns your books into something you can actually use for decisions.

The goal isn't perfection. It's an hour, on the same day each month, that leaves your numbers accurate enough to trust. Pick a date early in the month, after statements are available, and put it on your calendar. The fifth business day works well for most people.

Before you start: what to have open

Setup is where most closes lose time. Have these ready before the clock starts.

• Your accounting software, with bank feeds refreshed
• Last month's statements for every business bank account, credit card, and loan
• Your receipt inbox or capture app
• Your invoicing system and a list of bills due in the next 30 days
• Payroll reports, if you run payroll
• A running note of questions for your accountant

Minutes 0 to 20: clear the inbox

Start in your ledger with every uncategorized transaction from last month.

• Categorize each transaction, and fix any rule that sorted something wrong.
• Match receipts to expenses. Chase anything missing now, while you still remember what it was.
• Add a business purpose to meals, travel, and gifts. These need records of the amount, time, place, and business purpose, and notes made now are far stronger than notes made at tax time.
• Flag personal charges on business accounts and record them as owner draws, distributions, or amounts due from the owner, not expenses.
• Record business expenses you paid personally as owner contributions or, if your business reimburses you, add them to your next reimbursement request.
• Note any unusual items for your accountant rather than guessing.

Minutes 20 to 35: reconcile

Reconcile every business bank account, credit card, and loan against its statement. The ending balance in your ledger should match the statement to the cent.

If it doesn't, the usual causes are a missing transaction, a duplicate from the bank feed, or a transfer between accounts recorded as income or expense. Transfers are the most common mistake. Money moving between your own accounts is neither income nor expense.

Loans need one extra step. A loan payment is part principal, which reduces the balance, and part interest, which may be deductible. Recording the whole payment as an expense overstates deductions; recording it all as principal leaves the loan balance wrong. Match the split to the lender's statement.

Minutes 35 to 50: receivables, payables, and payments

Look at who owes you and whom you owe.

• Review open invoices and send reminders on anything past due.
• Confirm upcoming bills and payroll are funded.
• Check that every new contractor has a W-9 on file before you pay them again. For payments made in 2026, the Form 1099-NEC threshold is $2,000 per recipient, but collecting the W-9 up front is easier than chasing it in January.
• If you have employees, confirm payroll tax deposits went out on schedule. Quarterly Form 941 filings are due the last day of the month after each quarter ends: April 30, July 31, October 31, and January 31, moved to the next business day when a date falls on a weekend or holiday.
• Record any new equipment or software purchases with the invoice attached and the date placed in service noted.
• File new contracts, statements, and tax notices in your document vault.

Minutes 50 to 60: read the numbers

Now open your profit and loss and balance sheet. You're looking for three things.

First, does the month look right? Revenue and major expenses should roughly match what you expected. Second, how does year-to-date profit compare to your plan, and is your tax reserve keeping pace? Third, is anything coming that changes your tax picture, such as a large purchase, a new state, a hire, or a retirement contribution?

Moving a fixed share of each deposit into a separate tax savings account makes estimated payments a transfer, not a scramble. For 2026, individual estimated payments are due April 15, June 15, September 15, and January 15, 2027. In the month before each date, share your year-to-date numbers with your tax professional so the payment reflects the year you're actually having.

A worked example

Take a physical therapist running a practice as a single-member LLC. On the September close, the P&L shows $31,000 of revenue and $19,500 of expenses, for $11,500 of monthly profit. Year-to-date profit through September is $98,000, compared with a plan of $90,000.

The tax reserve account holds $21,000. Her preparer's projection from July assumed a lower profit, so she flags the gap and asks for an updated estimate before the January 15, 2027 payment. She also notices a $1,400 charge for a family dinner on the business card and recodes it as an owner draw, not a meals expense.

None of that took more than a few minutes. But catching the variance in September rather than March means the fourth-quarter payment can be sized correctly and there is time to decide on a retirement contribution before year-end.

Quarterly and year-end add-ons

Some tasks don't need to happen monthly but are easy to attach to the close in the right month.

• Quarterly: review the tax projection before each estimated payment date, and confirm payroll filings were made.
• Quarterly: review your accounts receivable aging and decide whether any old invoices are uncollectible.
• Mid-year: compare year-to-date results with last year and adjust your tax reserve percentage.
• December: gather W-9s for everyone you've paid, list asset purchases for the year, and decide on year-end moves with your preparer.
• January: send 1099s and W-2s, which are due January 31 (February 1, 2027 for 2026 forms, because January 31 falls on a Sunday), and lock the prior year in your ledger once it's reconciled.

Signs your close needs fixing

Keep a one-page checklist and tick it off each month. If a close takes much longer than an hour, that's a signal: too many accounts, too many manual entries, or a layer of your setup that isn't doing its job. Fix the cause, not just the month.

Other warning signs: the same transactions get recategorized every month, reconciliations are carried forward with unexplained differences, or personal charges keep showing up on business cards. Each one points to a process problem, and each one will surface again at tax time if it isn't solved.

It also helps to track how long each close takes. If the time is creeping up, look at which step is growing. A long inbox step usually means bank rules need tuning or receipts aren't being captured at the point of purchase. A long reconciliation step usually means too many accounts or transfers that aren't being matched. Those are one-time fixes that pay back every month after.

Frequently asked questions