The biggest mistake is commingling owner funds with your management company’s operating money. Every property owner’s funds need to sit in a separate trust or escrow account. When rent collections, security deposits, and owner disbursements flow through the same bank account you use to pay your own office rent and staff, you lose the ability to show any individual owner exactly where their money is. In New York, commingling trust funds can expose you to serious legal liability. It also makes your books a nightmare to untangle when an owner asks for a detailed accounting or when you’re preparing for an audit.

Skipping three-way reconciliation is the second most common problem. A three-way reconciliation means your bank balance, your trust ledger balance, and the sum of all individual owner balances all match. If they don’t, something is wrong. Maybe a payment was posted to the wrong owner. Maybe a bank fee hit the trust account and nobody recorded it. Running this reconciliation monthly catches discrepancies while they’re still small and traceable. Property managers who skip it end up with unexplained variances that grow over time and become extremely expensive to research and fix.

Posting owner expenses to the management company’s P&L is another frequent error. When you pay a plumber to fix a pipe at a property you manage, that’s the owner’s expense. It should hit the owner’s ledger, not your operating profit and loss statement. Mixing these up inflates your reported expenses, understates the owner’s costs, and produces financial statements that are misleading for everyone involved. Your P&L should reflect the cost of running your management company. Owner-level repairs, maintenance, and capital expenses belong on the owner’s statement.

Security deposits must be tracked as liabilities, not income. When a tenant hands you a $2,000 security deposit, that money does not belong to you or the property owner. It belongs to the tenant until you either return it or apply it against damages at move-out. Recording it as revenue or leaving it untracked means your books overstate income and you have no clear record of what you owe each tenant. New York has strict rules about how security deposits are held, and getting this wrong creates problems that go beyond just bad bookkeeping.

Missing 1099 filings is a quieter mistake that carries real penalties. If you pay a property owner more than $600 in a year, you’re required to file a 1099. The same applies to contractors you hire for maintenance and repairs. Property managers often handle dozens of owners and vendors, and it’s easy to lose track of who needs a 1099 by January. The IRS does follow up on missing filings, and the penalties add up quickly when you’re short on multiple forms. Our 1099 preparation service handles exactly this kind of filing so nothing gets missed at year end.

The common thread in all of these mistakes is that property management accounting requires more structure than a typical small business. You’re handling other people’s money, which means the standards for accuracy and documentation are higher. If your books haven’t been properly set up to separate owner funds, track deposits as liabilities, and run three-way reconciliations, the best time to fix that is now. M&H Accounting Services in the Bronx works with property managers and facility service companies across NYC to build bookkeeping systems that handle these requirements correctly from the start.