Manufacturing Tax Deductions: What Expenses Can You Write Off and What Must Be Capitalized?

Manufacturing businesses carry a unique tax profile. The costs that drive production (raw materials, labor, factory overhead, equipment) are substantial, but the tax code does not treat all of them the same way. Some costs are deductible in the year you pay them. Others must be capitalized into inventory and recovered only when the finished goods are sold. Getting this wrong means either overpaying taxes by missing legitimate deductions or triggering IRS scrutiny by deducting costs that should have been capitalized. The distinction matters, and it is governed by specific code sections that every manufacturer should understand.

What Manufacturing Costs Are Immediately Deductible?

Not every dollar a manufacturer spends gets trapped in inventory. Costs that are not directly tied to production remain ordinary and necessary business expenses under IRC 162, deductible in the year incurred.

Selling expenses fall squarely in this category. Salaries for your sales team, advertising, trade show costs, shipping to customers, and commissions are all deductible when paid. The same applies to general and administrative overhead: office rent (if separate from the factory), accounting fees, legal costs, insurance on non-production assets, and executive compensation that is not allocable to production.

Interest expense is deductible under IRC 163, though manufacturers with average annual gross receipts above $32 million (for 2026) face the business interest limitation under IRC 163(j), which caps the deduction at 30% of adjusted taxable income. For most small and mid-size manufacturers, the full interest deduction remains available.

Repair and maintenance costs on production equipment are deductible if they do not materially increase the asset’s value, adapt it to a new use, or substantially prolong its life. The IRS distinguishes between repairs (deductible) and improvements (capitalized), and the line between them has generated decades of litigation. The tangible property regulations under Treas. Reg. 1.263(a)-1 through -3 provide the framework, and manufacturers should document their repair expenses carefully.

Which Costs Must Be Capitalized Under the UNICAP Rules?

Here is where manufacturing tax gets complicated. IRC 263A, the Uniform Capitalization (UNICAP) rules, requires manufacturers to capitalize certain costs into inventory rather than deducting them as current expenses. The logic is straightforward: costs incurred to produce goods should be matched against the revenue those goods generate when sold, not expensed upfront.

The costs subject to UNICAP capitalization fall into three buckets.

Direct materials are the raw inputs that become part of the finished product. Steel, plastic resin, lumber, fabric, electronic components, chemicals: whatever goes into the product you sell must be capitalized into inventory. You recover these costs through cost of goods sold (COGS) when the inventory is sold, not when you purchase the materials.

Direct labor covers wages paid to employees whose work is directly tied to production. Assembly line workers, machine operators, quality control inspectors on the production floor, and packaging staff all generate direct labor costs that must be capitalized. Payroll taxes and benefits allocable to these workers follow the same treatment.

Factory overhead is the broadest and most disputed category. It includes indirect costs that support production but are not directly traceable to a specific unit of output. Factory rent, utilities consumed in the production facility, depreciation on production equipment, factory supervisors’ salaries, production-related insurance, and supplies used on the factory floor all fall here. Under UNICAP, a portion of these costs must be allocated to inventory using one of the methods permitted under the regulations (the simplified production method, the simplified service cost method, or a facts-and-circumstances method).

The allocation of mixed-use costs (those that serve both production and non-production functions) is where manufacturers most often get the calculation wrong. A facility that houses both the factory floor and the administrative offices, for example, requires a reasonable allocation of rent, utilities, and insurance between capitalizable production costs and deductible period costs.

For a deeper treatment of the UNICAP rules and compliance strategies, see our dedicated guide on inventory accounting and UNICAP under IRC 263A.

The Small Business Exception

Not every manufacturer is subject to UNICAP. IRC 263A(i) provides a small business exception for taxpayers with average annual gross receipts of $32 million or less (for 2026, adjusted for inflation) over the prior three tax years. If you qualify, you are exempt from the UNICAP capitalization requirements and can use whatever inventory method clearly reflects income, including deducting certain production costs in the year incurred. This threshold, expanded by the Tax Cuts and Jobs Act from the prior $10 million limit, pulled a significant number of mid-size manufacturers out of the UNICAP regime.

How Does Equipment Depreciation Work for Manufacturers?

Production equipment is a capital expenditure, not a current deduction, but the tax code provides several accelerated cost recovery mechanisms that can front-load the tax benefit substantially.

100% bonus depreciation under IRC 168(k) allows manufacturers to deduct the full cost of qualifying equipment in the year it is placed in service. The One Big Beautiful Bill Act (OBBBA) made 100% bonus depreciation permanent, eliminating the phase-down schedule that had been in effect. New and used equipment both qualify, provided the property has a recovery period of 20 years or less and meets the other statutory requirements. For manufacturers making large capital investments in machinery, this is often the single largest deduction on the return.

Section 179 expensing under IRC 179 offers an alternative or supplement to bonus depreciation. The 2026 expensing limit is $2,500,000 (inflation-adjusted), with a phase-out beginning at $4,000,000 of total equipment placed in service. Unlike bonus depreciation, Section 179 can be used selectively (you choose which assets to expense), and it is limited to taxable income from the active conduct of a trade or business. Some manufacturers prefer Section 179 for its flexibility, particularly when they want to control the timing of deductions across tax years.

For a detailed comparison of bonus depreciation, Section 179, and MACRS for manufacturing equipment, see our guide on equipment depreciation and Section 179 for manufacturers.

What Is QBI and Why Does Manufacturing Qualify?

The qualified business income deduction under IRC 199A allows eligible taxpayers to deduct up to 20% of their qualified business income from a pass-through entity (S corporation, partnership, or sole proprietorship). This deduction was enacted by the TCJA and has been extended by subsequent legislation.

The critical point for manufacturers: manufacturing is not a specified service trade or business (SSTB). The SSTB exclusion targets service-based fields like law, accounting, health, consulting, and financial services. Manufacturing, by contrast, produces tangible goods, and the IRS has consistently treated it as a qualifying trade or business for Section 199A purposes. This means manufacturers are eligible for the full 20% QBI deduction regardless of taxable income, subject only to the W-2 wage and UBIA (unadjusted basis immediately after acquisition) of qualified property limitations.

The W-2 wage limitation matters for manufacturers because the deduction cannot exceed the greater of (a) 50% of W-2 wages paid by the business, or (b) 25% of W-2 wages plus 2.5% of the UBIA of qualified property. Manufacturers with large payrolls and significant capital equipment typically clear both thresholds comfortably, making the full 20% deduction available.

Entity structure affects how the QBI deduction plays out. For a comparison of LLCs, S corporations, and C corporations in a manufacturing context, see our guide on entity structure for manufacturers.

Can Manufacturers Claim the R&D Tax Credit?

Yes, and more manufacturers qualify than realize it. The R&D credit under IRC 41 is not limited to lab-coat research. It covers qualified research activities (QRAs) that meet a four-part test: the activity must be intended to develop or improve a product, process, technique, formula, or software; the outcome must be uncertain at the outset; the activity must rely on principles of engineering, computer science, or the physical or biological sciences; and substantially all of the research must be experimental in nature.

For manufacturers, qualifying activities commonly include developing new products or product lines, improving existing manufacturing processes to increase yield or reduce waste, designing custom tooling or fixtures, developing or refining formulations, testing prototypes, and automating production steps. The credit applies to wages paid to employees performing or supervising qualified research, supplies consumed in research activities, and contract research expenses (at 65% of the amount paid).

The OBBBA restored immediate expensing for research and experimental expenditures under IRC 174, replacing the five-year amortization requirement that had been in effect for tax years 2022 through 2025. This change is significant for manufacturers: R&D costs are once again deductible in the year incurred rather than spread over five years, which improves cash flow and makes the R&D credit even more valuable in combination with the immediate deduction.

The credit itself is calculated using either the regular method or the alternative simplified credit (ASC) method. Most manufacturers use the ASC, which provides a credit equal to 14% of qualified research expenses exceeding 50% of the average QREs for the prior three years. For manufacturers just beginning to claim the credit, the rate is 6% of current-year QREs.

Small businesses (those with gross receipts of $5 million or less and no more than five years of gross receipts) can apply up to $500,000 of the R&D credit against payroll taxes, making it valuable even before the business is profitable.

For a complete walkthrough of the R&D credit calculation and documentation requirements, see our guide on the R&D tax credit for manufacturers.

How Does De Minimis Safe Harbor Apply to Manufacturing?

The de minimis safe harbor election under Treas. Reg. 1.263(a)-1(f) allows manufacturers to expense the cost of tangible property that would otherwise be capitalized, provided the cost per item (or per invoice) falls below a threshold.

For 2026, the thresholds are:

• $5,000 per item for taxpayers with an applicable financial statement (AFS), which generally means audited financial statements prepared in accordance with GAAP.
• $2,500 per item for taxpayers without an AFS, which covers most small and mid-size manufacturers.

The election is made annually on the tax return and applies to all amounts paid during the year that fall below the threshold. For manufacturers, this commonly covers hand tools, small power tools, replacement parts, safety equipment, jigs and fixtures, shop supplies, and low-cost testing instruments.

The de minimis safe harbor is an election, not an automatic rule. You must have a written accounting policy in place at the beginning of the tax year that treats amounts below the threshold as expenses for financial accounting purposes. The policy does not need to be elaborate, but it does need to exist and be consistently applied.

The practical benefit is real. A manufacturer that purchases 200 hand tools at $150 each can expense $30,000 immediately rather than capitalizing and depreciating each tool over its recovery period. For shops that cycle through consumable tooling regularly, the cumulative deduction adds up.

How Do Utility Costs Factor Into Manufacturing Deductions?

Utility costs in a manufacturing business straddle the line between deductible expenses and capitalizable overhead, and the treatment depends on the function the utility serves.

Electricity, natural gas, water, and other utilities consumed in the production process are indirect production costs subject to UNICAP capitalization. If your factory floor uses 70% of total facility electricity and the administrative offices use 30%, the 70% production share must be allocated to inventory as factory overhead. The remaining 30% is a deductible period expense.

Manufacturers should document their utility allocation method and be prepared to support it on examination. Sub-metering production areas provides the strongest evidence. Where sub-metering is not available, square footage allocation or machine-hour tracking are acceptable alternatives, though they carry more audit risk.

Utilities consumed in non-production facilities (a separate sales office, a warehouse used solely for finished goods storage after the production process is complete) are generally deductible as ordinary business expenses, though finished-goods warehousing costs may themselves be subject to UNICAP depending on the taxpayer’s method.

What About Employee Benefits and Indirect Costs?

Employee benefits (health insurance, retirement plan contributions, paid leave) for production workers are indirect production costs under UNICAP and must be allocated to inventory along with the underlying wages. Benefits for non-production employees (sales staff, administrative personnel, executives not involved in production) are deductible period expenses.

Training costs follow a similar split. Training that relates to production processes, equipment operation, or quality control is a production cost allocable to inventory. Training on sales techniques, management skills, or compliance topics unrelated to production is deductible.

The allocation of indirect costs is one of the most audit-sensitive areas of manufacturing tax compliance. The IRS expects manufacturers to use a consistent, documented method, and switching methods without a Form 3115 change-in-accounting-method filing invites scrutiny.

Cross-Reference Guides

For deeper coverage of the topics in this guide, see:

• Equipment Depreciation and Section 179 for Manufacturers
• Inventory Accounting and UNICAP Under IRC 263A
• The R&D Tax Credit for Manufacturers Under IRC 41
• Entity Structure for Manufacturers: LLC, S Corp, or C Corp

Related guides:

• Manufacturing Cost Segregation Facility
• Manufacturing Entity Structure Llc Scorp C Corp
• Manufacturing Equipment Depreciation Section 179
• Manufacturing International Tax Export Incentives
• Manufacturing Inventory Accounting Unicap 263A

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.