Deciding when to capitalize versus expense material costs comes down to one question: will the spending benefit your business beyond this tax year? If yes, you capitalize the cost and recover it later through Cost of Goods Sold or depreciation. If no, you deduct it now. Materials bought to make inventory are always capitalized; supplies used up delivering today’s work are expensed; and spending on property you already own follows a separate IRS test that decides whether the work counts as an improvement or a repair.
Getting the call wrong shifts taxable income into the wrong year and can draw IRS penalties and restatements, so the rules below are worth working through before you post the entry.
The Basic Rule for Materials and Supplies
Direct materials are the physical inputs that become part of a finished product you sell: a furniture maker’s lumber, a bakery’s flour, an assembler’s circuit boards. Because those costs can be traced to specific units of production, they get capitalized into inventory the moment you buy them. They sit on your balance sheet as an asset and only convert to an expense, as Cost of Goods Sold, when the finished product sells.
The capitalized amount is not just the invoice price. Freight, import duties, and handling charges to get the materials to your facility are part of the landed cost and belong in inventory alongside the purchase price, not in a separate operating expense line.
Supplies consumed immediately in doing the work, like cleaning chemicals for a janitorial crew or paper for an office, are expensed in full when purchased. General operating costs such as office rent, utilities, and administrative salaries are indirect and also expensed as paid, with one important exception for producers covered below under UNICAP.
Equipment and machinery you buy to run the business follow the inventory logic in a different form: you capitalize the purchase price and recover it over time through depreciation reported on Form 4562.1Internal Revenue Service. About Form 4562, Depreciation and Amortization The practical consequence of capitalizing anything is a timing difference. Expensing gives you the full deduction now; capitalizing spreads it across the years the asset earns its keep.
Spending on Property You Already Own
The hardest calls usually involve money spent on property already in service: a new roof on a warehouse, an engine overhaul on a delivery truck, rewiring an office. The IRS tangible property regulations require you to capitalize any expenditure that improves a unit of property, and they define “improvement” through three tests.2Internal Revenue Service. Tangible Property Final Regulations – Frequently Asked Questions
- Betterment. The work fixes a pre-existing defect, adds to the property’s size or capacity, or materially increases its productivity, efficiency, or output.
- Restoration. The work replaces a major component or substantial structural part, returns deteriorated property to working condition, or rebuilds it to like-new condition after the end of its class life.
- Adaptation. The work converts the property to a new or different use from what you originally intended when you placed it in service.
Hit any one of the three and you capitalize. Fail all three and you generally deduct the cost as a repair in the current year. The stakes are real: capitalizing a $50,000 roof replacement spreads the deduction across decades of depreciation, while expensing a $50,000 repair takes the whole deduction immediately.
Safe Harbors That Let You Expense Anyway
Even when a cost would technically be capitalizable, the IRS offers safe harbors that let smaller businesses skip the capitalization and depreciation machinery.
De Minimis Safe Harbor
A business without an applicable financial statement, which covers most small businesses, can elect to expense any item costing $2,500 or less per invoice. A business with audited financial statements prepared under GAAP can use a $5,000 per-invoice threshold instead.3Internal Revenue Service. Tangible Property Final Regulations – Frequently Asked Questions – Section: A De Minimis Safe Harbor Election You need a written accounting policy in place at the start of the tax year and you make the election annually on your return.
This is the rule that keeps laptops, office furniture, and small tools out of the depreciation schedule. Without it, a $2,000 desk would need to be capitalized and depreciated over seven years.
Routine Maintenance Safe Harbor
Recurring maintenance that keeps property in ordinary working condition can be expensed even when the dollar figure is substantial. The qualifying condition: when you first placed the property in service, you must have reasonably expected to perform the maintenance more than once during the property’s class life. For buildings and building systems, the window is more than once in the first ten years.4Internal Revenue Service. Tangible Property Final Regulations – Frequently Asked Questions – Section: Safe Harbor for Routine Maintenance
Inspections, cleaning, oil changes, filter replacements, and similar recurring work all qualify. If the work crosses into betterment, the safe harbor stops applying. Replacing a worn brake pad is routine maintenance; upgrading to a higher-performance braking system is a betterment you have to capitalize.
Faster Recovery When You Have to Capitalize
If a cost does have to be capitalized, two provisions let you recover much of it in the first year rather than waiting out a depreciation schedule.
Section 179 Expensing
Section 179 lets you deduct the full purchase price of qualifying equipment, machinery, vehicles, and certain other tangible property in the year it is placed in service. For 2026, the maximum deduction is $2,560,000 and begins to phase out dollar-for-dollar once total qualifying purchases exceed $4,090,000. Sport utility vehicles have a separate $32,000 cap.5Internal Revenue Service. Rev. Proc. 2025-32 – Section 4.24 The dollar figures adjust annually for inflation.6Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
A bakery buying a $180,000 commercial oven can deduct the whole price in the year it begins using the oven instead of spreading the write-off across a depreciation schedule.
100 Percent Bonus Depreciation
The One Big Beautiful Bill Act permanently restored 100 percent first-year bonus depreciation for qualified property acquired after January 19, 2025.7Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill The change removed the phase-down schedule and the earlier sunset date for placing property in service.8Internal Revenue Service. IRS Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction
Bonus depreciation has no dollar cap and no taxable-income limitation. It applies to new property and most used property, as long as the property is new to you. Larger capital spenders who blow through the Section 179 cap use bonus depreciation to write off the rest in the same year.
UNICAP: An Extra Capitalization Layer for Producers and Resellers
Manufacturers, producers, and certain resellers face an additional capitalization requirement under Section 263A, usually called the UNICAP rules. UNICAP requires you to capitalize not only direct material costs but also a share of indirect costs that support production, including factory rent, utilities, equipment depreciation, insurance, and storage.9Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses Overhead that would otherwise be deducted immediately has to be allocated to inventory and held there until the products sell.
Small businesses are exempt. If your average annual gross receipts over the prior three years fall below the Section 448(c) threshold, UNICAP does not apply to you.9Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses That threshold is adjusted for inflation annually and has been around $30 million in recent years; the current revenue procedure gives the exact figure for your tax year. Below the line, you can generally deduct indirect production costs as incurred and skip the UNICAP allocation.
Fixing a Classification You Got Wrong
If you have been expensing costs that should have been capitalized, or capitalizing costs that qualified for immediate deduction under a safe harbor, you correct the treatment going forward by filing Form 3115 to change your accounting method. The form includes a Section 481(a) adjustment that captures the cumulative difference between the old method and the new one, so income is not counted twice or dropped entirely.
Most capitalization-related changes qualify for automatic consent, which means no user fee and no wait for a ruling, though the IRS can still review the filing.10Internal Revenue Service. Instructions for Form 3115 – Application for Change in Accounting Method Changes that fall outside the automatic list require advance permission from the IRS National Office, with a user fee and a longer timeline. Filing under the wrong procedure can void the consent and expose you to penalties on returns you have already filed, so match your change to the right designated change number before you submit.