Why capitalised interest matters to a first-time founder
Capitalised interest shifts eligible borrowing cost from the current period into an asset, where it affects profit later through depreciation or the cost of sale. This matters for projects that take substantial time to complete. It does not reduce cash paid to the lender, so founders must keep accounting profit and cash funding separate.
Examples of capitalised interest
A developer borrows ¥100 million to construct a facility over 18 months and incurs ¥7 million of eligible interest while work proceeds. Under the applicable accounting standard, that interest may be added to the facility’s cost. Capitalisation stops when the asset is substantially ready, even if loan interest continues afterwards.
Common misunderstanding
Capitalised interest is not all interest paid on a business loan. The borrowing cost must relate to a qualifying asset under the relevant framework, and capitalisation generally covers the preparation period. IFRS and US GAAP differ in detail. Tax rules may also allow, require or deny a different treatment.
When to use it
Use the term when financing construction, development or production that takes substantial time before use or sale. Identify eligible expenditure, the capitalisation period and the borrowing rate under your accounting framework. Expense ordinary overdraft interest and post-completion interest unless the relevant rules support another treatment.
US spelling: capitalized interest.