Ask a cannabis operator what their inventory is worth and you will usually get a number. Ask what it cost to produce, how much of it moved to waste last quarter, and whether that figure matches what the state tracking system says, and the answers get slower. 

That gap is expensive. Inventory in a cannabis business is never just product sitting on a shelf. It carries production costs, tax consequences, compliance records, and a large share of the company’s working capital, often the single largest asset on the balance sheet. 

This post covers how cannabis inventory accounting should actually work: what belongs in COGS across cultivation, manufacturing, and retail, how to document waste so it holds up, what the 2026 §280E change means for cost classification, and how to reconcile the books to seed-to-sale records. 

Why Does Cannabis Inventory Accounting Matter So Much? 

Costs sit on the balance sheet as inventory until the product sells, then move into COGS. That single mechanic drives gross margin, product profitability, and most of what management thinks it knows about the business. 

Section 471 requires inventories wherever they are necessary to clearly reflect income, and businesses carrying inventory must identify and value what they have on hand using a consistent method. For manufactured goods, inventory cost can include direct materials, direct labor, and certain indirect production costs — the allocation rules under Section 263A are where most of the technical difficulty lives. 

Cannabis adds another layer. Licensed operators also track plants, harvests, packages, transfers, testing status, and finished products through state-mandated seed-to-sale systems. Metrc describes its platform as a compliance reporting system covering plant actions, inventory movements, packages, and sales across the regulated supply chain. 

The two systems serve different purposes. One tracks the financial value of inventory; the other tracks the regulated movement and status of cannabis. They need to agree. 

What Should Be Included in Cannabis COGS? 

COGS represents the cost assigned to products sold during the period. Costs tied to inventory that has not yet sold generally stay on the balance sheet. That sounds simple, and in practice deciding which costs belong in inventory is one of the most technical parts of cannabis accounting. 

Cultivation Costs 

A cultivator may incur costs for seeds or clones, growing media, nutrients and fertilizers, direct cultivation labor, production-related utilities, harvest labor, drying and curing, production supplies, and certain allocable facility costs. 

Those costs should not be dropped into one broad operating-expense account. Management needs to know which costs relate directly to producing inventory, which qualify for capitalization under the business’s applicable accounting and tax methods, and which remain period expenses. 

Cultivation is also a long work-in-process cycle, and most books never reflect it. A grower with plants in week six of flower is holding real accumulated cost that belongs in WIP, not in this month’s expenses. Skip that step and every harvest month looks artificially profitable while every planting month looks like a loss. 

Manufacturing and Processing Costs 

Raw cannabis may move through extraction, refinement, formulation, testing, packaging, and final production before becoming saleable. Oils, concentrates, edibles, beverages, and pre-rolls each carry different input costs and yields. 

Sound cannabis COGS accounting captures the materials and conversion costs at each stage rather than applying an arbitrary percentage at month-end. 

Retail and Dispensary Inventory 

Dispensaries have a simpler purchasing model, but accuracy still matters. Acquisition cost flows into inventory when product is received and into COGS when it sells, and freight or other qualifying acquisition costs may need to be considered depending on the method. Problems usually start when purchase data, point-of-sale records, accounting software, and the state tracking system stop reconciling. 

On method: FIFO, weighted average, and specific identification are all defensible. Which one you pick matters far less than picking one, documenting it, and applying it the same way every period. Inconsistency is what creates audit exposure, not the method itself. 

Strategic insight: COGS is not primarily a tax calculation. It is one of management’s most useful operating metrics. If the cost assigned to a product is wrong, the margin on that product is wrong too. 

How Did IRC §280E Change in 2026? 

For years, §280E disallowed deductions and credits for businesses trafficking in Schedule I or II controlled substances, pushing cannabis operators to move as much cost as legitimately possible into inventory and COGS. 

What Changed in April 2026 

That changed for part of the industry. Effective April 28, 2026, a DOJ final order moved FDA-approved marijuana drug products and marijuana subject to a qualifying state medical marijuana license from Schedule I to Schedule III. Operators covered by those licenses are no longer trafficking in a Schedule I substance, so §280E no longer applies to that activity. Everything else stayed put: adult-use cannabis remains Schedule I and §280E still applies to it, with a separate DEA proceeding on broader rescheduling now awaiting an administrative law judge’s recommendation and a decision from the DEA Administrator. We covered the planning implications in more depth in §280E tax planning after rescheduling. 

What It Means for Your Cost Records 

For accounting, that split creates a new requirement. Operators holding both medical and adult-use licenses need to separate costs by license activity, not just by department or location. Treasury and the IRS intend to issue guidance on the order’s tax consequences, and the final rule encourages Treasury to consider retrospective relief for earlier years, which makes clean historical cost records worth preserving while amended returns and protective claims are on the table. 

The discipline itself has not changed: classify costs based on what they actually represent, document the methodology, apply it consistently. What is new is that the classification now has to carry the license activity with it. 

How Should Cannabis Waste and Loss Be Recorded? 

Waste is normal in cannabis production. Plants die, harvest weight drops during drying, product fails testing, manufacturing generates loss, and retail inventory expires. But “waste” should never become the plug that makes the books balance. 

Document the Reason for Every Adjustment 

Operators should distinguish among normal shrinkage, harvest loss, processing loss, testing samples, failed or contaminated product, damaged inventory, expired product, destruction, and unexplained shortages. These events do not carry identical accounting or regulatory consequences. Damaged or unsalable inventory may require specific valuation treatment, and inventory losses generally run through inventory and COGS rather than becoming a separate deduction. 

Seed-to-sale systems also require inventory-changing events to be reported and traceable. Metrc (Marijuana Enforcement Tracking Reporting Compliance) users report harvesting, processing, packaging, and other movements affecting product status. A destruction event should therefore agree across operational records, regulatory records, and the general ledger. If one system says ten pounds were destroyed and another says eight, that discrepancy needs an explanation, not another journal entry. 

What Does It Actually Cost to Produce One Unit? 

A common weakness in growing cannabis companies is that bookkeeping stays too high-level. Management knows total payroll, total utilities, total packaging expense, total revenue, but not what it costs to produce one pound of flower, one gram of concentrate, or one batch of gummies. 

That is where cannabis cost accounting earns its keep. A manufacturer should be able to connect input material cost with extraction labor, applicable production overhead, testing, packaging, and final yield. 

Say a production run costs $20,000 and was expected to yield 8,000 grams of oil, putting unit cost at $2.50 per gram. The run actually yields 6,200 grams. Unit cost jumps to $3.23, a 29% increase that nobody sees if costs are only tracked in monthly totals. Wholesale pricing built on the $2.50 assumption is now underwater, and a product that looked profitable at the gross level may not justify the next run. 

Strategic insight: Accurate production costing turns inventory accounting from a compliance obligation into an operating system. Operators can identify inefficient batches, compare yields, set better prices, and see which products actually generate cash. 

How Should You Reconcile the Books to Seed-to-Sale Records? 

A cannabis operator typically holds inventory information across several systems: 

Those numbers should tell the same story. For cannabis inventory reconciliation, compare physical counts to seed-to-sale quantities, seed-to-sale inventory to POS or ERP records, purchases to vendor invoices, transfers to receiving documentation, sales quantities to COGS entries, waste adjustments to destruction records, and ending quantities to general-ledger inventory values. 

Monthly reconciliation is a reasonable baseline. High-volume or higher-risk operations need more frequent cycle counts and exception reviews. Year-end is far too late to find out. 

Physical Counts Still Matter 

Physical counts remain essential even with perpetual systems. IRS guidance in Publication 538 directs businesses using perpetual or book inventory to take physical inventories at reasonable intervals and adjust book records to what is actually on hand. For cannabis operators, those counts also serve as a control against shrinkage, data-entry errors, unrecorded waste, and compliance discrepancies. 

Which Inventory Reports Should Management Review? 

Good cannabis inventory accounting produces information owners can act on: 

• Inventory valuation — quantity and financial value by category, location, or product. 

• Inventory aging — items sitting unsold for unusually long periods and tying up cash. 

• Gross margin by product — selling price against properly assigned COGS, showing which products carry sustainable margin. 

• Yield and variance — expected output versus actual production for cultivation and manufacturing, flagging abnormal loss. 

• Book-to-seed-to-sale reconciliation — discrepancies between financial inventory, operational systems, physical counts, and regulatory records. 

Together these tell management far more than a total inventory balance ever will. 

What Are the Most Common Cannabis Inventory Accounting Mistakes? 

Several problems appear repeatedly as operators grow: 

• Recording inventory purchases directly as expenses 

• Using unsupported allocations to increase COGS 

• Failing to distinguish production costs from general overhead 

• Allowing POS and accounting quantities to drift apart 

• Recording waste without supporting documentation 

• Waiting until year-end to reconcile inventory 

• Applying a costing methodology inconsistently across periods 

• Ignoring work-in-process inventory 

• Failing to investigate negative inventory 

• Treating compliance software as the company’s accounting system 

Another is assuming technology will fix weak processes. QuickBooks, NetSuite, a cannabis ERP, a POS platform, and Metrc can all hold accurate data and still produce unreliable financial statements when mappings, workflows, and reconciliations are poorly designed. The accounting architecture matters more than the software. 

Build Inventory Records That Hold Up 

Inventory may be the largest asset on a cannabis company’s balance sheet. It is also the easiest place for weak accounting to quietly distort margin, pricing, and tax exposure. 

The strongest operators treat costing, waste documentation, and seed-to-sale reconciliation as one connected system rather than three separate chores. They investigate exceptions instead of forcing the systems to balance. 

At High Life CPA, our IRS compliance and IRC §280E advisory services help cannabis operators build accurate inventory and cost accounting, reconcile financial records to seed-to-sale data, and document cost allocations that can withstand review. The goal is not to make the inventory balance match. It is to know what your products cost, where your margin comes from, and where inventory is being lost. 

Have a question about your inventory or cost accounting? Call High Life CPA at (662) 205-6333 or email info@highlifecpa.com.