Does last-in-first-out always lower my taxes?

No. Last-in-first-out assigns the newest, highest costs to the goods sold, so it reduces reported income only while costs are rising; when costs fall it does the opposite and raises income. It also carries ongoing computation and recordkeeping burdens and, in some cases, a conformity requirement that the same method be used in reporting to owners and creditors. Adopting it is an accounting-method election rather than a bookkeeping preference, so a later switch generally requires a formal method change. The outcome depends on the direction of your own costs, not on the method's reputation.

What is uniform capitalization?

Uniform capitalization, or UNICAP under section 263A, requires many producers and resellers to add a share of indirect costs — purchasing, handling, storage, and certain administrative costs tied to inventory — into the value of that inventory rather than deducting them in the year incurred. Those capitalized costs are recovered through cost of goods sold as the inventory is sold, which raises inventory value and current taxable income. A small-business exception keyed to average annual gross receipts relieves qualifying businesses from the rules entirely.

Can I write down inventory that is not selling?

A write-down is allowed when the inventory has genuinely lost value — it is obsolete, damaged, or no longer sellable at normal prices — and the reduced value is supported by records created at the time, such as markdown documentation, disposal records, or evidence of the price actually obtainable. Goods that remain sellable at their usual price cannot be written down simply because they are moving slowly. Examiners test a write-down for a real, documented loss rather than an estimate used to lower income in a strong year.

LIFO, FIFO, weighted average, UNICAP, and write-downs

Inventory accounting sets how a business values the goods it holds and, in turn, how much profit it reports. The method you choose — first-in-first-out, last-in-first-out, or weighted average — changes the cost assigned to what you sell. Uniform capitalization rules can pull added indirect costs into inventory, and a small-business exception can relieve both that burden and the duty to keep inventories at all.

Verify annually — figures adjust

The gross-receipts threshold for the small-business exception from uniform capitalization and from keeping inventories is adjusted periodically; confirm the current figure before relying on the exception.

No capital outlay

There is no capital outlay, but the methods carry real bookkeeping cost. Last-in-first-out and uniform capitalization in particular require careful, ongoing computation and records, and adopting or changing a method generally requires a formal accounting-method change rather than a simple switch.

Key points

Inventory valuation sits between purchases and cost of goods sold, so the method a business chooses directly changes the profit it reports.
First-in-first-out assigns the oldest costs to goods sold; last-in-first-out assigns the newest, which lowers reported income only while costs are rising.
Uniform capitalization requires many producers and resellers to add indirect purchasing, handling, and storage costs into inventory value instead of deducting them immediately.
A gross-receipts-based small-business exception relieves qualifying businesses from uniform capitalization and can excuse them from keeping inventories for tax purposes.
Inventory may be written down only when it is genuinely obsolete, damaged, or unsellable at normal prices, and the loss must be documented.

What is it?

Inventory sits between purchases and cost of goods sold, so its valuation directly affects taxable income. Under first-in-first-out, the oldest costs are assigned to the goods sold first, leaving newer costs in ending inventory. Under last-in-first-out, the newest costs flow to cost of goods sold first, and older costs remain on hand. Weighted average blends all costs together. In a period of rising prices, last-in-first-out generally reports higher cost of goods sold and lower income than first-in-first-out.

Uniform capitalization, known as UNICAP, requires many producers and resellers to add certain indirect costs — a share of purchasing, handling, storage, and administrative costs tied to inventory — into the value of the inventory rather than deducting them immediately. That defers those costs into cost of goods sold as the inventory sells, which raises inventory value and current income.

A small-business exception, keyed to a gross-receipts test, relieves qualifying businesses from UNICAP and can also excuse them from keeping inventories for tax purposes, letting them treat inventoriable items as materials and supplies instead. Separately, inventory that becomes obsolete, damaged, or unsellable can be written down to reflect its reduced value, lowering income in the year the loss is recognized.

Statutory basis

Who does it apply to?

Businesses that buy, make, or hold goods for sale and must assign cost to what they sell each year.

Producers and resellers evaluating whether uniform capitalization applies to them or whether they qualify for the small-business exception.

Businesses holding aging, damaged, or obsolete stock that may support a write-down to reflect its true value.

Who does it not work for?

Service businesses with no real inventory, where there are no goods to value and the methods do not apply.
Small businesses already under the gross-receipts exception, which are relieved from UNICAP and may not need to keep tax inventories at all.
Owners expecting last-in-first-out to reduce income when their costs are falling, since in that environment it generally raises reported income instead.
Businesses hoping to write down inventory that is still saleable at normal value, where no genuine loss in value has occurred.

What does the IRS look at?

Whether the inventory method is applied consistently year to year rather than switched to suit the result.
Whether a business subject to uniform capitalization has actually captured the required indirect costs in inventory.
Whether a business claiming the small-business exception genuinely meets the gross-receipts test.
Whether a last-in-first-out election was made and maintained properly, including any required conformity in financial reporting.
Whether inventory write-downs reflect a real, documented loss in value rather than an estimate used to lower income.

What does it cost to fund, and when does the window close?

The professional work is a CPA who confirms whether UNICAP applies or the small-business exception is available, chooses and documents the valuation method, and files any method change needed. Because method choices are made with the return and changes may require advance filing, involve the CPA before year-end rather than at filing time.

Related strategies

Common questions

Does last-in-first-out always lower my taxes?: No. Last-in-first-out assigns the newest, highest costs to the goods sold, so it reduces reported income only while costs are rising; when costs fall it does the opposite and raises income. It also carries ongoing computation and recordkeeping burdens and, in some cases, a conformity requirement that the same method be used in reporting to owners and creditors. Adopting it is an accounting-method election rather than a bookkeeping preference, so a later switch generally requires a formal method change. The outcome depends on the direction of your own costs, not on the method's reputation.
What is uniform capitalization?: Uniform capitalization, or UNICAP under section 263A, requires many producers and resellers to add a share of indirect costs — purchasing, handling, storage, and certain administrative costs tied to inventory — into the value of that inventory rather than deducting them in the year incurred. Those capitalized costs are recovered through cost of goods sold as the inventory is sold, which raises inventory value and current taxable income. A small-business exception keyed to average annual gross receipts relieves qualifying businesses from the rules entirely.
Can I write down inventory that is not selling?: A write-down is allowed when the inventory has genuinely lost value — it is obsolete, damaged, or no longer sellable at normal prices — and the reduced value is supported by records created at the time, such as markdown documentation, disposal records, or evidence of the price actually obtainable. Goods that remain sellable at their usual price cannot be written down simply because they are moving slowly. Examiners test a write-down for a real, documented loss rather than an estimate used to lower income in a strong year.

Mena Hemaia, CPA, CIA

Chief Executive Officer, Accountack — West Palm Beach, Florida

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