Under US GAAP, you expense patent-related research and development as it’s incurred and capitalize the legal and filing costs of obtaining the patent itself. The decision to capitalize or expense patent costs turns on a single dividing line: costs spent figuring out whether the technology works are R&D and hit the income statement immediately, while costs spent securing the legal monopoly become an intangible asset on the balance sheet. Tax rules follow a different framework, and starting in 2025 they’re considerably more generous for domestic work than the book treatment suggests.
Pre-Filing R&D Is Always Expensed
ASC 730 requires that all internally generated research and development costs be expensed in the period incurred, even when the work produces a successful, patentable invention.1Internal Revenue Service. FAQs – IRC 41 QREs and ASC 730 LBI Directive The reasoning is that during early-stage development, no one can reliably say a project will produce commercial value, so putting those costs on the balance sheet would inflate reported assets.
Everything consumed getting the technology to work belongs in this bucket. Researcher salaries. Prototype materials. Depreciation on lab equipment. Allocated rent and utilities for a dedicated R&D facility. The cutoff is the point of technological feasibility and the company’s decision to pursue patent protection; every dollar spent before that is an expense regardless of the outcome.
Filing and Legal Costs Get Capitalized
Once you decide to pursue protection, the treatment flips. The legal and filing costs of obtaining the patent are capitalized because they create a specific, enforceable legal right with measurable future economic benefit. The asset you’re recording is the legal monopoly, not the technology underneath it.
Capitalized costs typically include:
- Attorney fees for prior art searches, drafting claims, and prosecuting the application through the USPTO
- USPTO filing, examination, and issuance fees
- Foreign filing fees and translation costs
- Legal costs of winning an interference or derivation proceeding during prosecution, because those solidify the enforceability of the claims
One practical carve-out trips up smaller companies. If total patent filing costs fall below the company’s internal capitalization threshold, expense them. A startup spending $3,000 on a provisional application under a $5,000 capitalization policy would expense the cost rather than carry it as an asset.
The line between the R&D pool and the capitalized patent pool must be clean and documented. Auditors spend real time here because the incentive to shift expenses into the asset column (or vice versa) is obvious.
Costs After the Patent Is Granted
Post-grant spending gets its own analysis, and the default is expense.
Maintenance Fees
The USPTO charges maintenance fees at three intervals to keep a utility patent in force. As of March 2026 the standard fees are $2,150 at the 3.5-year mark, $4,040 at 7.5 years, and $8,280 at 11.5 years, with small entities paying 40% and micro entities 20%.2United States Patent and Trademark Office. USPTO Fee Schedule These fees are expensed as incurred because they preserve the existing right without enhancing or extending it beyond the original 20-year term.3SEC. Summary of Significant Accounting Policies
Miss a maintenance deadline and the patent lapses. The USPTO offers a six-month grace period with a surcharge; after that, revival requires a petition showing unintentional delay.
Defensive Litigation
Legal fees to defend a patent require a fact-specific call. If successful litigation meaningfully extends the patent’s useful life or broadens the scope of its claims, those costs may be capitalized because the outcome created new economic value. That’s the exception.
Most successful defenses simply confirm the existing right and protect current revenue. Those costs are ordinary operating expenses; the defense maintained value rather than creating it. Costs from an unsuccessful defense are expensed immediately, and a ruling that invalidates or narrows the patent triggers an impairment review of what’s left on the books.
Amortizing the Capitalized Patent
A capitalized patent is amortized over its useful life starting when it’s available for use. The period is the shorter of the patent’s legal life or its estimated economic useful life. Most companies use straight-line.
The legal life of a US utility patent is 20 years from the application filing date.4United States Patent and Trademark Office. 2701 Patent Term Economic life is often much shorter. A patent covering a software algorithm may be commercially obsolete in five years even though legal protection runs two decades. Engineers and product managers, not accountants, usually give the better estimate because the question is how fast the technology is moving.
Impairment and Abandonment
Capitalized patents must be tested for impairment when events suggest the carrying amount may not be recoverable. Common triggers: a competitor launches a superior technology, revenue from the patented product drops sharply, or a court ruling casts doubt on enforceability.
The test under ASC 360-10 first compares the carrying amount to the sum of undiscounted estimated future cash flows from continued use and eventual disposal. If those cash flows fall below the carrying amount, you measure the loss as the difference between carrying amount and fair value, typically estimated by discounting projected royalty or licensing revenue.
Voluntary abandonment is simpler. When a company stops paying maintenance fees or otherwise lets a patent lapse, the entire remaining unamortized book value is written off in the period of abandonment. This happens more often than people expect in large portfolios, where periodic reviews turn up patents that no longer fit the product strategy.
How Tax Treatment Differs
Financial reporting and the tax code diverge on patent costs, and the same expenditure often lands differently on the income statement than on the return. Recent legislation widened the gap in favor of the return.
Domestic Costs Under Section 174A
The One Big Beautiful Bill Act created new Section 174A of the Internal Revenue Code, effective for tax years beginning after December 31, 2024. Domestic research and experimental expenditures can be fully deducted in the year paid or incurred.5Office of the Law Revision Counsel. 26 USC 174A – Domestic Research or Experimental Expenditures This reversed the TCJA’s mandatory five-year amortization rule that had been in effect since 2022.
Patent attorney fees fall inside this provision. The IRS has classified costs of obtaining a patent, including attorneys’ fees for making and perfecting the application, as specified research or experimental expenditures.6Internal Revenue Service. Guidance on Amortization of Specified Research or Experimental Expenditures Under Section 174 Notice 2023-63 The practical result: for tax purposes in 2026, you can fully deduct patent prosecution costs in the year incurred even though GAAP requires capitalizing those same costs.
Taxpayers who want to spread the deduction can elect to capitalize domestic R&E and amortize over a period of at least 60 months, starting from the month the research first produces a benefit.5Office of the Law Revision Counsel. 26 USC 174A – Domestic Research or Experimental Expenditures The election may make sense for a company expecting losses in the current year that wants to preserve the deduction for profitable years ahead.
Foreign Research Under Section 174
The favorable treatment stops at the border. Foreign research and experimental expenditures still must be capitalized and amortized over 15 years beginning at the midpoint of the tax year in which they’re incurred.7Office of the Law Revision Counsel. 26 USC 174 – Amortization of Research and Experimental Expenditures Overseas R&D faces a much longer cost recovery timeline than the same work done domestically.
Acquired Patents Under Section 197
When a company buys a patent from another entity, Section 197 requires the buyer to amortize the acquisition cost on a straight-line basis over 15 years.8Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles That’s regardless of remaining legal life. A patent with six years left before expiration still amortizes over 15 years for tax purposes if acquired after 1993.
Section 197 explicitly excludes self-created intangibles. A patent a company develops internally and files for itself doesn’t fall under this provision; the R&D and prosecution costs follow Section 174A instead (or Section 174 for foreign work).6Internal Revenue Service. Guidance on Amortization of Specified Research or Experimental Expenditures Under Section 174 Notice 2023-63
Book-Tax Timing Differences
The divergence creates temporary differences that flow through deferred tax accounting. Capitalize $50,000 of patent filing costs under GAAP while fully deducting the same $50,000 under Section 174A, and book income exceeds taxable income in year one. The relationship reverses as GAAP amortization reduces book income in later years with no corresponding tax deduction remaining. Those timing differences are tracked through deferred tax liabilities.
For acquired patents, GAAP amortizes over the shorter of legal or economic life while tax uses a fixed 15 years under Section 197, so the two schedules will almost always differ.8Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles
Documentation That Holds Up
The capitalize-or-expense split is only as defensible as the records behind it. The IRS requires that costs be allocated to research activities based on a cause-and-effect relationship or another method that reasonably connects costs to the benefits they provide, and whatever method you pick for each cost type must be applied consistently from year to year.6Internal Revenue Service. Guidance on Amortization of Specified Research or Experimental Expenditures Under Section 174 Notice 2023-63
For labor, the IRS expects a time-based allocation: total labor costs multiplied by the ratio of time spent on research to total time worked. For facilities, a square-footage ratio works. Both need to be documented contemporaneously, not reconstructed after the fact.
The separation that matters most is between pre-filing R&D and post-decision prosecution costs. Under GAAP, one is expensed and the other capitalized. Under current tax law, both qualify for immediate deduction as domestic research expenditures, but they still need to be identified and tracked separately because the book entries differ. Commingle the pools and you end up restating financials or losing deductions you were entitled to claim.