For manufacturers watching raw-material costs climb under successive rounds of tariffs, the LIFO inventory method has moved from an accounting footnote to a live cash-flow decision. Last-in, first-out accounting lets a company match its most recent, highest material costs against current revenue, which lowers taxable income exactly when input prices are rising. With steel, aluminum, electronics components, and imported parts all carrying tariff-inflated price tags into 2026, LIFO inventory is getting a fresh look across factory floors and finance departments alike.
Quick answer: LIFO inventory reduces a manufacturer’s current taxable income during inflation by deducting the cost of the most recently purchased (and most expensive) inventory first, deferring tax on the difference between old and new material costs. In a tariff-driven environment where material prices are climbing, that deferral can be substantial. The benefit reverses if inventory levels later shrink, triggering LIFO liquidation, and the election must be made on a timely filed return using IRS Form 970. Timing the election to the inflationary window is where the planning value lives.
How LIFO Turns Material-Cost Inflation Into a Tax Deferral
The mechanics are straightforward. Under LIFO, the cost of goods sold reflects the newest inventory purchased, so when a manufacturer buys steel at a tariff-inflated price and sells finished product, the expensive recent cost flows through the income statement first. The older, cheaper inventory stays on the balance sheet in what accountants call a LIFO layer or reserve.
The result is a higher cost of goods sold, a lower gross margin on paper, and lower taxable income than the company would report under FIFO or average cost. That difference is not a permanent tax savings: it is a deferral. The tax that would otherwise be due this year is pushed into future years, and the company holds onto the cash in the meantime.
For a capital-intensive manufacturer, that retained cash matters. It can fund the next inventory purchase, service debt, or cover the working-capital strain that tariffs themselves create. The deferral is largest precisely when price increases are steep and inventory quantities hold steady or grow, which describes the position many manufacturers found themselves in through 2025 and into 2026.
This is why inflation and tariffs amplify LIFO’s appeal in tandem. According to The Tax Adviser, heightened inflation combined with increased tariffs has created an unusually favorable window for LIFO adoption, with Producer Price Index data showing sharp commodity cost increases as tariffs took hold. The bigger the spread between historical and current costs, the larger the reserve a manufacturer can build.
It helps to ground this in a simple sequence. A manufacturer buys a batch of raw material early in the year at one price, then buys more of the same material later at a tariff-inflated price. When product ships, LIFO assigns the later, higher cost to that sale. The early, cheaper batch remains on the books, and its low cost is the deferred income that LIFO sets aside. As long as the company keeps replacing what it sells, that low-cost layer stays put and the deferral persists.
What Does Electing LIFO Inventory Require? Form 970 and the Conformity Rule
Electing LIFO is not an internal accounting choice a company can make quietly. The election is governed by Internal Revenue Code section 472, and a taxpayer formally adopts the method by filing IRS Form 970, Application to Use LIFO Inventory Method, with its income tax return for the first year of the election. The election must be made on a timely filed return, including extensions, for the year it takes effect.
LIFO adoption applies prospectively only. A manufacturer cannot retroactively pull prior-year inventory into the method, which means the cost savings tied to the current inflationary period are only captured if the election is in place for that year. Waiting a year can forfeit the deferral attributable to that year’s price increases, since those costs will have already flowed through under the old method.
That prospective rule is the reason timing dominates the conversation. The deferral a manufacturer can claim is tied to the price increases that occur while LIFO is in effect, not before. If tariffs drive a steep run-up in a given year and the company is still on FIFO, the high costs from that run-up pass through the income statement at the lower deferral value the old method allows, and that opportunity does not come back.
The most consequential string attached is the conformity rule under Section 472(c). A taxpayer that uses LIFO for tax purposes must also use LIFO for financial reporting to shareholders, lenders, and other external stakeholders. This book-tax conformity requirement means the lower income shown to the IRS is the same lower income shown on financial statements, which can matter for loan covenants, bonding, and investor optics.
In the first LIFO year, the company also restores any prior inventory write-downs and values beginning inventory at cost rather than at lower-of-cost-or-market. Many manufacturers use dollar-value LIFO with an external Producer Price Index, which groups inventory into pools and tracks changes in dollar value rather than counting individual units. That approach reduces recordkeeping burden and is well suited to companies with broad, changing product lines. Because the conformity rule and the method elections interact with banking relationships and entity structure, this is a decision worth modeling with your tax advisory team before filing.
The dollar-value approach deserves a closer look, because it shapes how practical LIFO is for a real manufacturer. Counting individual units across a product line that changes from year to year is tedious and error-prone. Pooling inventory and measuring the change in total dollar value, indexed to a published Producer Price Index, lets a company track its LIFO layers without item-by-item recordkeeping, which is why so many manufacturers with diverse catalogs choose it.
What Is LIFO Liquidation and Why Does It Reverse the Benefit?
The same mechanic that creates the deferral can flip into an unexpected tax bill. LIFO liquidation occurs when a manufacturer’s inventory quantities decline and the company is forced to sell from its older, lower-cost LIFO layers. Those old costs, sometimes years old and far below current replacement cost, hit the income statement, collapsing cost of goods sold and pushing taxable income sharply higher in a single year.
The triggers are familiar to anyone who lived through recent supply disruptions: a deliberate drawdown of stock, a production slowdown, a shift in the business model, or a shortage that prevents replenishment. A manufacturer that built large LIFO reserves during the tariff-inflation years could face a concentrated tax liability if it later runs inventory down, recognizing in one year the income it deferred across many.
Certain corporate events accelerate the reckoning regardless of inventory levels. Converting a C corporation to an S corporation can require the company to recapture the accumulated LIFO reserve into income under Internal Revenue Code section 1363(d), and asset sales or mergers can likewise trigger recognition. These are not reasons to avoid LIFO, but they are reasons to model the downstream scenarios before electing, especially if an ownership transition or sale is on the horizon.
The practical takeaway is to treat LIFO as a method that rewards stable or growing inventory and punishes sustained drawdowns. A manufacturer planning to keep inventory levels consistent through the tariff cycle is well positioned to hold the deferral; one anticipating a wind-down should weigh the eventual recapture against the near-term savings. Pease Bell works with manufacturing clients to run these projections under realistic inventory and pricing assumptions before any election is filed.
It is worth separating the two kinds of reversal, because they call for different planning. A liquidation driven by ordinary inventory swings tends to be partial and may even reverse again as the company restocks. A reversal driven by a corporate event such as a sale or a C-to-S conversion is structural, and it can pull a large share of the accumulated reserve into income at once. The first is a cash-flow timing question; the second is a transaction-planning question that belongs in any conversation about selling or restructuring the business.
Is LIFO Inventory the Right Move for Your 2026 Tax Year?
LIFO is most valuable for manufacturers that carry meaningful inventory, expect continued cost increases, and intend to maintain or grow inventory quantities. If those conditions hold, the deferral can free up significant cash during a period when tariffs are already squeezing margins and working capital.
It is less attractive for companies in a declining-inventory phase, those with loan covenants that penalize lower reported earnings, or businesses anticipating a sale or entity conversion where recapture would land at an inconvenient time. The conformity rule also means a manufacturer cannot show strong book earnings to lenders while showing low income to the IRS.
The decision turns on the spread between historical and current material costs, the stability of inventory quantities, the entity structure, and the company’s financing relationships. Because the election is prospective and must be filed on a timely return, the planning conversation needs to happen before the filing deadline for the year a manufacturer wants the benefit to begin.
A useful way to frame the analysis is to weigh near-term cash against future flexibility. LIFO trades a known, present cash benefit for a future obligation that surfaces when inventory falls or the entity changes hands. For a company committed to operating and restocking through the tariff cycle, that trade favors LIFO. For one with a sale, a wind-down, or a restructuring in view, the same trade can work against it, which is exactly why the projection matters more than any rule of thumb.
Frequently Asked Questions
What is the LIFO inventory method and why does it help during tariffs?
LIFO, or last-in, first-out, assumes the most recently purchased inventory is sold first. During tariff-driven inflation, those recent purchases carry the highest costs, so deducting them first raises cost of goods sold and lowers current taxable income. The result is a deferral of tax that lets manufacturers retain cash while material prices rise.
How does a manufacturer elect LIFO?
A manufacturer elects LIFO by filing IRS Form 970, Application to Use LIFO Inventory Method, with a timely filed income tax return (including extensions) for the first year of the election, under Internal Revenue Code section 472. The election is prospective only and cannot be applied to prior years.
What is the LIFO conformity rule?
Under Section 472(c), a business that uses LIFO for tax purposes must also use LIFO for its financial statements issued to shareholders, lenders, and other stakeholders. This book-tax conformity requirement means the company reports the same lower income for both tax and financial reporting, which can affect loan covenants and investor presentations.
What triggers LIFO liquidation and why is it a risk?
LIFO liquidation happens when inventory quantities decline and a company sells from its older, lower-cost LIFO layers, sharply increasing taxable income in that year. Common triggers include planned inventory drawdowns, production slowdowns, and supply shortages. Separately, corporate events such as a C-to-S conversion (which triggers LIFO recapture under section 1363(d)), an asset sale, or a merger can pull the accumulated reserve into income. Modeling these scenarios before electing LIFO helps avoid an unexpected concentrated tax bill.
