1. Reconcile Every Bank and Credit Card Account
Match every transaction in your accounting software to the corresponding line on your bank or credit card statement. Any discrepancy — a duplicate entry, a bank fee not yet recorded, a fraudulent charge — shows up here first. In LA, where many small businesses run multiple vendor accounts, a credit card reconciliation missed for even one month can hide hundreds of dollars in undetected charges.
Reconciliation is the foundation everything else in this checklist depends on. If your bank balance and QuickBooks balance do not agree, none of your financial reports are reliable.
2. Categorize All Business Transactions
Every transaction that hit your accounts last month needs a correct expense category. This is not just for tidiness — the IRS requires substantiation by category for deductions, and the wrong category can cost you a legitimate deduction or trigger an audit flag.
Mixed-use items are the most common problem for LA sole proprietors and small business owners: a cell phone used for business and personal calls, a vehicle driven for both, a home office in a two-bedroom in Culver City. Each of these requires a consistent allocation percentage applied every month. Set it once and apply it consistently — ad hoc guessing at year-end is what gets owners in trouble.
3. Review Unpaid Invoices and Follow Up on Overdue Accounts
Pull your accounts receivable aging report and identify any invoice more than 30 days past due. LA clients — especially in entertainment, construction, and professional services — often run on extended payment cycles. A 30-day follow-up cadence keeps your receivables current without damaging client relationships.
Invoices that age past 90 days become progressively harder to collect. An invoice you wrote off last December because you forgot to follow up is revenue that never made it to your bank account.
4. Record and Reconcile All Business Receipts
The IRS requires written substantiation for any expense deduction. A bank statement alone is not enough — you need the receipt. For LA business owners who entertain clients at restaurants, take meals during business travel, or purchase supplies from multiple vendors, digital capture is the practical solution: photograph receipts immediately with QuickBooks Mobile, Dext, or a similar tool and match them to the transaction in your software.
Missing receipts discovered at year-end are a time drain. Missing receipts discovered during an audit are a deduction at risk. The monthly habit costs two minutes per transaction; the year-end scramble costs hours.
5. Log Business Mileage
California does not fully conform to federal tax treatment in all cases, and the IRS requires a contemporaneous mileage log — meaning you record the date, destination, business purpose, and miles at the time of each trip, not at year-end from memory. The 2026 standard mileage rate is 70 cents per mile. For LA business owners who routinely drive between job sites, client offices, suppliers, and the bank, the annual deduction can be significant.
Apps like MileIQ or Everlance automate this with GPS tracking and one-tap business/personal classification. A manual log works too, as long as it is contemporaneous. Review and export your mileage log monthly so nothing is lost if you switch phones or change apps.
6. Review Your Cash Position and Outstanding Payables
Look at your current bank balance, your incoming receivables due this month, and every bill due in the next 30 days. For most LA small businesses, rent and payroll are the two largest fixed lines — they are non-negotiable and need to be funded first. Mapping your 30-day cash position monthly prevents the surprise of a payroll date arriving with insufficient funds.
If you are consistently running your cash review two weeks after month-end, you are flying blind for most of the month. The goal is to complete this review within the first week of the new month while you can still act on what you see.
7. Check Payroll Records and Contractor Payments
California has some of the most complex wage and hour laws in the country. Monthly, verify that your payroll records match what was actually paid, that all required withholdings were remitted, and that your DE 9 quarterly filings are on track. If you use a payroll provider, reconcile their reports to your bank account — do not assume the software is correct without checking.
For contractors: confirm that you have a signed W-9 on file for every contractor you expect to pay $600 or more for the year. The $600 threshold is cumulative, not per payment — a contractor you paid $200 in each of the first five months of the year crosses the threshold in June. CPAs who specialize in California employment law can help structure your contractor relationships correctly; visit our partner hub for referrals to CPA and payroll specialists who work with LA small businesses.
8. Review Sales Tax Collected vs. Remitted
California’s statewide base sales tax rate is 7.25%, but LA County adds district taxes. In many LA County cities the combined rate reaches 10.25%; some cities are higher. If your business sells taxable goods or certain services, you must collect the correct district rate based on where delivery occurs — not where your business is located. A business in Gardena selling goods delivered to a customer in Culver City charges the Culver City rate.
Monthly CDTFA filers must remit by the last day of the following month. Quarterly filers follow a different schedule. The most dangerous trap: treating collected sales tax as operating revenue. It is not your money. It is held in trust for the CDTFA, and failing to remit it on time is one of the fastest ways to accumulate penalties and interest in California. Reconcile what you collected against what you remitted every month, not just at filing time.
9. Reconcile Your Accounts Payable
Compare your vendor statements to your records. Unmatched bills, credit memos you never applied, and invoices entered twice all live in your AP aging until someone finds them. For LA businesses that work with multiple vendors — distributors, contractors, landlords, and service providers — an AP reconciliation prevents double-payment, catches missed credits, and gives you an accurate picture of what you actually owe.
A clean AP ledger also protects vendor relationships. Calling a vendor to dispute a balance six months later is a harder conversation than catching the discrepancy at 30 days.
10. Update Your Profit and Loss Statement
With reconciliation and categorization complete, pull your monthly P&L and review it against the prior month and the same month last year. Identify which revenue lines are growing and which are flat or declining. Look at your gross margin trend — if revenue is up but margin is down, your cost of goods or direct labor costs are rising faster than your pricing. Look at which expense lines are creeping: the $200-per-month subscription that became $400, the utilities that jumped in the summer heat.
Monthly P&L review is the difference between running a business and running a job. Owners who review their numbers monthly make better pricing decisions, catch cost problems before they compound, and have a clear answer when a banker, investor, or potential buyer asks how the business is performing. If you want a professional to own the monthly close and deliver clean numbers on a schedule, visit our lead intake page to get a quote.
What It Looks Like When These 10 Items Are Current
When a Los Angeles small business owner completes these 10 tasks every month, they arrive at year-end with reconciled bank accounts, categorized transactions, substantiated receipts, a complete mileage log, remitted sales tax with no CDTFA balance due, W-9s on file for every 1099 contractor, and a P&L that accurately reflects the year. Their CPA can close the year quickly, their tax return requires no scramble, and any question from the IRS or California FTB has a documented answer.
The owners who do not complete these tasks monthly spend the first quarter of the following year catching up, paying their CPA for bookkeeping work that should have been done in real time, and filing extensions while they wait for reconciled numbers. The catch-up is more expensive, more stressful, and less accurate than keeping the books current.
If you are behind on any of these items or want a professional to own the monthly close, get a quote through our lead intake page. CPAs, commercial realtors, and SBA lenders who work with LA small businesses can refer clients through our partner hub.