Ordered in December, Installed in January: Which Year Gets the Deduction?

Do not use the invoice date as the entire story

Year-end equipment purchases often produce a paperwork mismatch. The purchase agreement is dated in December, the deposit clears before the holiday, but installation finishes in January. The tax analysis needs the facts about readiness for use, not only the date that makes the most convenient deduction.

IRS depreciation guidance uses a placed-in-service concept: property must be ready and available for its intended function. The relevant facts can differ among machinery, vehicles, buildings, and components of a larger project. Ask the advisor to identify the property being analyzed and the conditions necessary for that property to serve its intended use.

Build a chronology while events are fresh

Keep the purchase contract, invoice, shipping confirmation, delivery receipt, installation report, test results, and acceptance correspondence. Identify the location, intended function, and person who can explain readiness. A dated operations log is more helpful than a reconstructed statement made months later.

Delivery alone may not resolve the question when equipment cannot function without an installation step. Conversely, actual full production volume is not necessarily the same thing as readiness. Capture the condition of the asset at each stage and let the advisor apply the rule to supported facts.

A hypothetical production line

Imagine a manufacturer receives a new machine on December 20. It remains crated until January 4, after which an electrician connects it and the supplier completes required testing. A December invoice and bank payment do not establish that the machine was ready in December.

Now imagine a separate replacement machine that is installed, tested, and available for production on December 28, although the company first uses it on January 3 because the plant is closed. That is a different factual record. These examples illustrate why an operations timeline matters; they are not determinations for a particular taxpayer.

Coordinate project accounting and tax accounting

Large projects can include land, building work, equipment, software, repairs, and deposits. Different components may have different treatment and readiness dates. Avoid grouping every payment into one undifferentiated equipment account. Supply detailed contractor invoices and describe which parts can function independently.

A financial statement entry does not settle every tax question. The accountant may need book-to-tax adjustments and election decisions. Ask whether local or state depreciation treatment differs and whether financing costs or prepaid services need separate analysis.

Make an early operational decision

If a purchase is commercially necessary, identify installation capacity before signing. Delivery promises are not the same as an operational schedule. A realistic January start may be better than an unsafe or rushed December installation. Do not create inaccurate acceptance documents to support a preferred tax year.

At the year-end close, send a list of assets in transit, assets under installation, and assets ready for use. Include supporting dates and unresolved questions. That list gives the preparer a defensible starting point and prevents an invoice from silently becoming the only evidence.

Create a readiness certificate from actual facts

Ask the operations lead to prepare a factual completion memo identifying the asset, location, intended purpose, delivery date, installation status, required testing, and remaining work. Attach supporting records. The memo should describe facts and uncertainties; the tax advisor should determine their reporting implications. Avoid asking an employee to certify a tax conclusion they are not qualified to make.

If a project is only partially complete, describe what can operate and what cannot. Identify whether equipment depends on another component, permit, utility connection, or construction phase. Keep separate records for assets that were available and those that remained unavailable. A single project completion percentage may not answer the question for every asset.

This process is particularly valuable for projects managed outside the accounting team. Accounting may see a paid invoice while operations knows that essential testing failed or installation was postponed. Build the operations check into the close rather than waiting for a preparer's question. An accurate January readiness date is more useful than unsupported December paperwork, and it helps management understand why the expected tax timing may have changed.

For an asset that missed the expected readiness date, update both the fixed-asset records and the tax projection. Tell the advisor what changed and preserve the revised schedule. Management should also reconsider cash reserves if an anticipated current-year tax benefit will occur later or differs from the original illustration.