When a medical practice operates out of multiple locations, certain costs don’t belong neatly to any single office. Admin staff who support the whole organization, a shared billing department, EHR system licenses, umbrella malpractice insurance, and management company fees all benefit every location but show up as one lump expense. Without a clear allocation method, you can’t see which locations are actually profitable and which ones are being carried by the rest.

The most common allocation methods are revenue-based, patient volume, headcount, and square footage. Each one works best for different types of costs.

Revenue-based allocation divides shared costs according to each location’s percentage of total practice revenue. If Location A generates 60% of revenue and Location B generates 40%, shared costs split 60/40. This method works well for management fees, billing department costs, and general administrative overhead because it reflects each location’s relative contribution to the organization. It’s the most widely used approach for good reason.

Patient volume works similarly but uses encounter counts instead of dollars. This can be more appropriate for costs tied to how many patients flow through the system rather than how much they pay. EHR licensing, for example, often scales with usage and patient records rather than revenue.

Headcount allocation divides costs based on the number of employees at each location. It makes sense for HR-related overhead, employee benefits administration, and similar people-driven expenses. A location with 15 staff members consumes more HR resources than one with 5, regardless of revenue.

Square footage allocation applies when the cost is space-related. Shared property insurance or a centralized maintenance contract might logically be split based on how much physical space each location occupies.

The reality is that most medical practices end up using a blended approach. Revenue-based for most general overhead, headcount for HR costs, and square footage for facility costs. That’s perfectly fine as long as each method is documented and applied the same way every period. What creates problems is switching methods when it’s convenient or allocating costs inconsistently from month to month. If you ever face an audit or need to produce financials for a lender, inconsistent allocation will raise questions fast.

Document your allocation methodology in writing. Include which costs get allocated, which method applies to each cost category, and how the percentages are calculated. Review the percentages quarterly as revenue and staffing shift between locations. A location that represented 30% of revenue six months ago might represent 40% today, and the allocation should reflect that.

Getting this right matters beyond just clean financials. If you’re evaluating whether to expand a location, renegotiate a lease, or hire additional providers at a specific office, you need accurate location-level profitability. Without proper overhead allocation, a location can look profitable when it’s actually losing money once its fair share of shared costs is applied. For practices managing multiple entities and locations, having a medical practice bookkeeper in Orange County who understands multi-entity structures makes a real difference in the quality of your numbers.

Start with revenue-based allocation if you’re not currently allocating at all. It’s the simplest to implement and gives you a reasonable picture immediately. Then refine as needed once you can see what the location-level reports are telling you.