Open a separate bank account for the property before you do anything else. Every rent payment goes in, every expense comes out. Mixing rental money with your personal checking is the single biggest mistake new landlords make. It turns tax prep into a forensic exercise and makes it nearly impossible to know whether the property actually makes money.

If you plan to buy more properties, consider setting up an LLC and opening the account in the entity’s name. Even with one property, a dedicated account creates the separation you need. A business credit card for property expenses makes tracking even cleaner.

Track all income sources, not just rent. That includes late fees, pet fees, application fees, security deposits (these are liabilities, not income, but you still need to record them), and any reimbursements from tenants for utilities or damages. Each category matters for tax reporting and for understanding what the property actually generates.

Track expenses against the categories that match Schedule E, the IRS form you’ll file for rental income. The main ones are mortgage interest (not principal, which isn’t deductible), property taxes, insurance, repairs and maintenance, property management fees, utilities you pay, HOA fees, advertising, legal and professional fees, supplies, and travel related to the property. Capital improvements like a new roof or HVAC system get depreciated over time rather than expensed in one year, so keep those separate from routine repairs.

Use cash-basis accounting. You record income when rent hits your account and expenses when you pay them. Most individual landlords use cash basis because it’s simpler and matches how the IRS wants the information reported. Accrual makes sense for larger portfolios or specific reporting situations, but for one property it’s overkill.

Keep every receipt. A shoebox works. A folder on your phone works better. The IRS doesn’t care how you store them as long as you can produce them if they ask. Digital copies are fine.

QuickBooks Online works well for rental properties if you set it up with the right chart of accounts and use the class or location feature to track by property. Spreadsheets work for a single property if you’re disciplined, but once you add a second or third, software pays for itself quickly. The rental property accounting needs we handle for investors gets more complex with each property added, so setting up a scalable system from day one saves pain later.

Reconcile the bank account monthly. Match every transaction in your books to what cleared the bank. This catches errors, missed expenses, and any issues with tenant payments while they’re still fresh. It also means your numbers are ready whenever your CPA asks for them at year end.

One more thing worth mentioning. Depreciation is your biggest tax benefit as a landlord, and it happens automatically on your tax return regardless of your bookkeeping. But you need to know your cost basis, which includes purchase price plus closing costs plus capital improvements minus the land value. Document this from the start. If you ever need help getting the system set up correctly, the Pasadena bookkeepers at A Squared can walk you through it based on Dennis’s real estate accounting background.