Fixed-asset accounting

Construction in progress: accumulate, capitalise, split

Project costs accumulate without depreciation until the asset is ready for use, then become one or several assets with their own lives. Interest is capitalised while three conditions hold.

Figure 1. Illustrative screen with sample data: projects accumulate cost until they go into service, then become assets in one step.

Published 30 June 2026; last checked 20 September 2026. Applies to: US GAAP; governments under GASB 89 do not capitalise interest. Authority: FASB ASC 360-10-30; ASC 835-20; GASB Statement 89. Written by Fixed Assets Desk Inc., Sachse, Texas. General description of federal rules; not tax advice for a particular taxpayer.

Construction in progress accumulates the costs of getting an asset ready for its intended use, including interest while expenditures, activities and interest cost all continue, and depreciates nothing until the asset is placed in service. On that date the project is capitalised into one asset or several, each with its own class and lives.

Construction in progress is cost waiting for an in-service date.

A project account accumulates the costs of getting an asset ready for its intended use: the contract price, materials, direct labour, engineering, permits, freight, installation and testing, and, for a qualifying asset that takes time to build, interest (ASC 360-10-30 and ASC 835-20). Nothing in the account depreciates, because depreciation starts when the asset is placed in service, for book and for tax alike. Training, relocation, abnormal waste, and the general and administrative costs of the company are not capitalised. Repairs to keep an existing asset running are not a project.

Interest is capitalised while three conditions hold.

Under ASC 835-20-25-3, interest is capitalised only while expenditures for the asset have been made, activities necessary to get it ready are in progress, and interest cost is being incurred. The amount is the weighted-average accumulated expenditures for the period multiplied by the rate on borrowings specific to the project, or the weighted-average rate on other borrowings, and it cannot exceed the interest actually incurred in the period. Capitalisation stops when the asset is substantially complete and ready for use. Governments do not capitalise interest: GASB Statement 89 requires it to be expensed, for reporting periods beginning after 15 December 2020 after the Statement 95 postponement.

Figure 2. Illustrative screen with sample data: the audit trail an auditor asks for, filterable by user, asset and date.
LineAmount
Costs accumulated in the project to the in-service date (contracts, materials, direct labour, permits, engineering)2,860,000.00
Capitalised interest: weighted-average accumulated expenditures of 2,000,000.00 during construction at the 6% borrowing rate120,000.00
Interest actually incurred in the period (the ceiling on capitalisation)300,000.00
Total capitalised2,980,000.00
Capitalised into: building extension, 39-year (federal), 40-year (book)2,250,000.00
Capitalised into: process line, 7-year (federal), 12-year (book), units of production available610,000.00
Capitalised into: site improvements, 15-year (federal and book)120,000.00
Figure 3. A project capitalised into three assets on the day the line starts. Each asset gets its own in-service date, class and lives; the project balance goes to zero. Sample figures.

One project usually becomes several assets.

The building extension, the process line inside it and the site work outside it have different lives in every book and different tax classes, and on the federal side the line may qualify for bonus depreciation or section 179 while the building does not (unless it is qualified production property). The capitalisation step therefore splits the project's cost into assets, each with its own in-service date, and the project's balance goes to zero. A project that capitalises into one asset at the building's life understates depreciation on the equipment and overstates it on the building for decades. The lifecycle page shows the project-to-asset step; the manufacturing page is where it matters most.

What to record on the asset.

  • The project, its budget, and every cost by invoice with the date, so the roll-forward's transfers-from-CIP line has support.
  • The capitalised interest computation by period, with the rate and the weighted-average expenditures.
  • The in-service date of each asset created from the project, which is the date depreciation starts.
  • The class and lives in each book of each asset created, and the bonus or section 179 elections on the federal side.
  • The project's closing balance, which should be zero, or the reason it is not.

In Fixed Asset Desk: a project accumulates cost against a budget and capitalises into one asset or several, with the class, the date and the methods set at that moment; the CIP report lists open projects.

Sources: FASB ASC 360-10-30 (initial measurement); FASB ASC 835-20 (capitalization of interest); GASB Statement 89 (accounting for interest cost incurred before the end of a construction period) and Statement 95; Internal Revenue Code section 263A (uniform capitalization). Checked 20 September 2026.

The questions asked about this, answered.

When does depreciation start?

On the in-service date of each asset created from the project, for book and for tax; the project itself never depreciates.

Is interest capitalised on every project?

Only on qualifying assets that take time to build, while expenditures have been made, activities are in progress and interest is being incurred, and never more than the interest actually incurred.

Do governments capitalise interest?

No. GASB Statement 89 requires interest incurred before the end of a construction period to be expensed.

Why split a project into several assets?

Because the building, the equipment inside it and the site work have different lives in every book and different federal treatment; one asset at the building's life misstates depreciation for decades.

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