Capitalization of Interest Cost During the Construction of Assets

True Tamplin

Written by True Tamplin, BSc, CEPF®
Updated on August 25, 2021

Most accountants treated the acquisition of an asset and the obtaining of funds to pay for the acquisition as separate and unrelated events. GAAP departs from that convention only in terms of interest incurred while the asset is under construction and excludes interest incurred during its useful life. That is, interest incurred in preparing the asset for use is considered to be a cost of the asset.


The capitalization of interest applies to noninventory assets produced where three factors are present.
First, the firm must have incurred actual interest charges during the period, either on debt specifically obtained for the project or on debt that could have been retired if the funds used in the project had been applied for that purpose.
Second, the firm’s expenditures on the project must have involved payments of cash, exchanges of other assets, or creation of interest-bearing debt. In other words, the firm must have made commitments of resources that could have been avoided or redirected into retirement of debt such that interest charges could have been reduced.
Third, these expenditures must have been made while the asset undergoing preparation for use, including such activities as planning, obtaining government permits, and actual construction. This requirement forbids capitalization of interest during extended periods of inactivity when nothing is being done to prepare the asset for use.

Expenditure Base

The amount of interest that can be capitalized is found by applying appropriate interest rates to the “average amount of accumulated expenditures”. To compute this average amount (known as expenditure base), the firm begins with the cost of the asset and deducts from that amount any expenditures that were made in the form of accrued liabilities or other noninterest-bearing debt. The remainder represents the resources committed to the acquisition of the asset.
The next step is the calculation of the average commitment during the covered time period, which is determined simply by taking one half of the sum of the beginning and ending net expenditures. The statement does not specify whether the average should be annual, quarterly, or monthly. The approach chosen should be selected to provide a close approximation of the typical amount committed throughout the period.
This expenditure base may be divided further into two segments if interest is attributable to both specific and general debt. That is, part of the expenditure base may be financed by funds acquired specifically for the project, while the remainder of the funds came from other sources unrelated to the project. When this condition exists, the expenditure base is partitioned before applying the appropriate interest rates.

Interest Rates

If debt financing has been obtained specifically for the construction, its interest rate should be multiplied by that portion of the expenditure base derived from that debt. If amounts in excess of those borrowed funds have been spent, their balance should be multiplied by an average interest rate from general debt obligations. The purpose of this calculation is to determine the amount of interest that could have been avoided if the expenditures had not been made.


Suppose that Sample Company begins construction of a two-year project on January 3, 20×1. During 20×1, it incurs a total cost of $400,000. At the end of the year, it has recognized noninterest-bearing liabilities (such as accounts payable) for $100,000 of that amount. The year-end expenditure base is thus $300,000, or $400,000 less $100,000. The average accumulated expenditures for 20×1 are $150,000, or one half of the sum of the beginning and ending totals ($0 plus $300,000). Of that amount, $110,000 was raised through specific borrowing at 13 percent. The remainder was financed out of nonspecific borrowing with a rate of 9 percent. The amount of capitalizable interest is computed as follows:
Capitalization of interest cost during construction of assets
If total interest costs incurred (but unpaid) for the year are $38,000, this journal entry would be recorded at the end of the year:
Capitalization of interest cost during construction of assets journal entry
Thus, $17,900 would also be added to the expenditure base. Therefore, the balance at the beginning of 20×2 would be $317,900.
Suppose that new expenditures of $700,000 are incurred in 20×2, that all the noninterest-bearing debt is paid off, and that the project is completed on December 30. The average expenditure base would be computed as follows:
Capitalization of interest cost during construction of assets example
Of this $717,900, suppose that $600,000 was financed by the 13 percent specific loan and the balance from the 9 percent general debt. The capitalizable interest is:
Capitalization of interest cost during construction of assets example
If the total interest costs for the year are unpaid and equal $105,000, this journal entry would be recorded:
Capitalization of interest cost during construction of assets journal entry
The total cost of the asset can be computed as shown below:
Capitalization of interest cost
The effect of capitalization is to present higher reported earnings during the period of construction by not expensing part of the interest cost and lower earnings in later years through higher depreciation expense. Whether these results represent a better picture or a distortion depends upon one’s judgment as to whether interest is indeed a necessary cost of making the asset ready for use. Following example presents a note disclosure made by Boise Cascade Corporation related to the capitalization of interest.

Bios Cascade Corporation
Summary of Significant Accounting Policies

Interest is normally expensed as incurred, except when it is incurred in conjunction with major capital additions, and then it is capitalized as part of the asset cost. Interest capitalized on major capital additions is determined by applying current interest rates to the funds required to finance the construction. Interest of $12,981,000 and $2,106,000 was capitalized during 2018 and 12017, increasing earnings per share by 25% and 4%, respectively. The amortization of interest capitalized in prior years did not significantly affect income for the periods.

Leave a Comment