The most effective setup in QuickBooks Online uses sub-customers for each property and classes for individual units. Create a parent customer that represents your entire portfolio or a property group, then add each property as a sub-customer underneath it. Classes get assigned to specific units within those properties. When you enter a bill or expense, you tag it with both the property (sub-customer) and the unit (class), which lets you pull reports at whatever level of detail you need.

Set up your chart of accounts to separate routine maintenance from capital improvements. This distinction matters for taxes. Routine maintenance like fixing a leaky faucet, replacing a garbage disposal, or repainting a unit is a current-year expense you can deduct immediately. Capital improvements that extend the useful life of the property or add value, like a new roof, replacing all the windows, or a full kitchen remodel, need to be capitalized and depreciated over time. If you lump everything together, your tax return will be wrong in one direction or the other.

Establish a dollar threshold for owner approval before money gets spent. If you’re managing properties for others, or even for yourself with a property manager in place, set a clear number. Anything under $500 (or whatever makes sense for your situation) gets handled without approval. Anything above requires sign-off before the work starts. This prevents surprise invoices and gives you a natural checkpoint to evaluate whether something is truly a repair or an upgrade that should be handled differently.

For tracking the actual requests, keep a simple log that connects each maintenance request to the expense when it’s paid. Some property management software handles this automatically, but if you’re running things through QBO, a consistent naming convention on your memos or descriptions works. Include the property address, unit number, and a brief description of the work. When you run a profit and loss by sub-customer at year end, every dollar ties back to a specific request and a specific unit.

Run a profit and loss report filtered by sub-customer quarterly at minimum. This shows you which properties are eating up your maintenance budget and which units are repeat offenders. A unit that needed $3,000 in repairs over six months might signal a deeper problem worth addressing with a larger capital project instead of constant patching. That kind of visibility only exists if the tracking is consistent from day one.

Real estate investors with growing portfolios often start tracking this way too late, after they’ve already lost sight of per-property profitability. If you’re behind on getting your books organized by property and unit, catching up now saves you from guessing at numbers when tax season arrives or when you’re evaluating whether to sell a property.

The system itself is straightforward. The hard part is discipline. Every expense needs to be coded correctly when it happens, not reconstructed months later from memory. If you don’t have time to stay on top of it yourself, small business bookkeeping services focused on real estate can maintain the structure for you and make sure nothing slips through the cracks.