The answer depends on the size of your practice and the types of supplies you’re purchasing. Most small medical and dental practices expense supplies when they buy them. You purchase gloves, gauze, or sterilization pouches, and that cost hits your books immediately as a supply expense. This is the cash method and it works well when your supply purchases are relatively consistent month to month.

The distinction that matters most is between consumables, high-value materials, and capital equipment. Consumables are the everyday items your practice goes through regularly like exam gloves, cotton rolls, disinfectant, and paper products. These get expensed as purchased. Nobody needs to track a box of tongue depressors as inventory.

High-value materials are where it gets more nuanced. Dental practices in particular deal with crowns, implant components, precious metals, and lab materials that can carry significant per-unit costs. If your practice stocks these items and their value on hand fluctuates meaningfully, perpetual inventory accounting gives you a more accurate picture of your true costs. You track what comes in, what gets used, and what’s still on the shelf. This matters for cost of goods sold calculations and for understanding your real margins on procedures.

Capital equipment is a separate category entirely. Dental chairs, X-ray machines, autoclaves, and similar items with useful lives beyond a year get capitalized and depreciated rather than expensed. Depending on the cost, you may be able to use Section 179 to deduct the full amount in the purchase year, but the item still needs to be recorded as an asset on your balance sheet and depreciated according to IRS rules.

One of the most useful benchmarks for practice owners is supply cost as a percentage of revenue. For general dental practices, this typically runs between 5% and 8%. Specialty practices like oral surgery or orthodontics may run higher due to more expensive materials. Medical practices vary widely depending on the specialty, but tracking this ratio monthly tells you whether your supply spending is in line or creeping up. A sudden jump might mean waste, theft, price increases from a vendor, or simply that you ordered ahead. You can’t investigate what you don’t measure.

Set up your chart of accounts to separate clinical supplies from office supplies and from equipment. Lumping everything into one “supplies” line makes it impossible to see where your money is going. Clinical supplies should be their own category. Office supplies like paper and toner are a different line. Cleaning supplies are another. This level of detail takes minimal extra effort during bookkeeping but gives you much better visibility when reviewing your financials.

For practices thinking about tracking inventory more formally, the key question is whether the cost and effort are worth the insight. If you stock $500 worth of disposable supplies, the answer is no. If you have $15,000 in dental lab materials sitting in storage at any given time, tracking that as inventory gives you better financial statements and better control over ordering.

Whether your practice expenses supplies at purchase or maintains a formal inventory system, having accurate and timely books is what makes the data useful. Our Northern Virginia small business bookkeeping services include working with healthcare practices to build the right structure for tracking supply costs so you always know where your margins stand and can make informed decisions about vendors, pricing, and purchasing.