What it means
Normally, when a business borrows money and pays interest, that interest is recorded as an expense on the income statement immediately. However, if you borrow money specifically to construct a major asset, such as a factory, a piece of heavy machinery, or a software system, accounting rules view that interest differently.
Because the asset is not yet generating revenue while under construction, the loan interest required to build it is considered part of the total cost of creating that asset. Instead of hitting your profit and loss statement right away, the interest is added directly to the balance sheet value of the asset.
This practice is known as capitalisation. Once the asset is finished and ready for use, you begin recovering this total cost, including the accumulated interest, gradually through depreciation over several years.
Why does this matter for non-finance managers? It prevents your financial statements from looking unfairly strained during a major building project.
If you had to expense millions in loan interest while a new building was still empty concrete, your yearly profit would plummet. In practice, companies must track construction loans very carefully.
Capitalisation usually begins as soon as you incur construction costs and borrow money, and it stops the moment the asset is ready for its intended use. Any interest paid after that completion date must be expensed normally.
Imagine baking a custom cake to sell. The cost of electricity used to run the oven while baking is part of the recipe cost, not your household utility bill for that month.
Similarly, interest paid while building an asset becomes part of the asset cost.
In practice
Real-world examples
Example 1
TechStart Ltd borrows $500,000 at 6% interest to build a custom software platform over one year. The $30,000 of interest accrued during development is added to the software asset value. Once the platform is ready for use, any further interest is an ordinary expense.
Example 2
GreenFields Bakery borrows $200,000 at 8% to build a new commercial kitchen. During the six-month build, the $8,000 of loan interest ($200,000 x 8% x 6/12) is added to the building cost rather than shown as an expense. The bakery's first-year profit is therefore higher than if the interest had been expensed.
Example 3
Metro Logistics takes out a $1 million loan at 6% to construct a regional distribution warehouse. The $60,000 of interest paid during construction is added to the property asset account. The warehouse is then depreciated on its full cost, including the interest, over its useful life.
Think of it
Imagine baking a custom cake to sell. The cost of electricity used to run the oven while baking is part of the recipe cost, not your household utility bill for that month. Similarly, interest paid while building an asset becomes part of the asset cost.
Formula
Calculation
Capitalised Interest = Capitalisation Rate x Weighted Average Accumulated Expenditures
Capitalised interest cannot exceed the interest actually incurred in the period.
Worked example. A company builds a warehouse over one year with a construction loan at 5% interest. It spends $400,000 on 1 January and a further $600,000 on 1 July.
- Weighted average expenditure = ($400,000 x 12/12) + ($600,000 x 6/12) = $400,000 + $300,000 = $700,000
- Capitalised interest = $700,000 x 5% = $35,000
- If the loan interest actually incurred was $40,000, then $35,000 is added to the cost of the warehouse and the other $5,000 is expensed
- The warehouse is recorded at $1,000,000 + $35,000 = $1,035,000
- With a 20-year life and no residual value, annual depreciation = $1,035,000 / 20 = $51,750
Simple version. If you spend an average of $500,000 on construction during the year, and your specific construction loan interest rate is 5%, your capitalised interest for that period is $500,000 x 5% = $25,000.Case study
Seen in the real world
This is a fictional, illustrative scenario. Oakwood Manufacturing decided to build a new assembly plant to meet rising customer demand. The company secured a dedicated $2 million construction loan at a fixed interest rate of 6% per year, which it drew in full at the start of the project. The construction project took exactly twelve months to complete from breaking ground to opening day.
During that twelve-month construction period, Oakwood incurred total loan interest charges of $120,000. Without capitalised interest, this $120,000 would have appeared on Oakwood's annual profit and loss statement as an immediate expense, significantly reducing that year's reported net profit. Instead, following proper accounting standards, Oakwood capitalised the full $120,000 of interest. The finance team added this amount directly to the asset value of the assembly plant on the balance sheet, bringing the total recorded asset value to $2,120,000.
Once the plant opened, Oakwood began using the facility and depreciating its total cost over a twenty-year period, a charge of $106,000 a year. By capitalising the interest, the company matched the borrowing costs against the future revenues generated by the new plant, protecting short-term profitability and providing a true reflection of the asset creation cost. The finance director was careful to stop capitalising on the opening day, and the first interest payment after that date was expensed as normal.
Watch out
Common mistakes
- Continuing to capitalise interest after the asset is complete and ready for use.
- Applying capitalisation to general business loans that are not tied to specific asset construction.
- Forgetting to include the capitalised interest in the total asset base when calculating future depreciation.
Questions
People also ask
Does capitalised interest save me actual cash?
No. Capitalisation is an accounting treatment that affects your financial reports, not your bank account. You still have to pay the cash interest to the lender on schedule.
Can I capitalise interest on routine maintenance or repairs?
No. Capitalised interest only applies to assets that take a significant period of time to get ready for use, such as construction projects or major custom developments.
What happens to the capitalised interest once the asset is finished?
It becomes part of the asset cost on your balance sheet and is gradually expensed over time through annual depreciation charges.