Loans & debt
Capitalized interest: Definition, Formula and Example
For a loan, interest capitalization occurs when unpaid accrued interest is added to principal, which can increase later interest charges.
Scope: Loan concept with U.S. student-loan context; no particular repayment-plan entitlement is asserted.
Other names and related labels: Interest capitalization; Interest added to principal.
How it works
Accruing interest and capitalizing it are distinct events. A student loan can accrue simple interest without continuously compounding it. Whether and when unpaid interest capitalizes depends on the loan, applicable rules and the triggering event.
Principal after capitalization = principal before capitalization + interest capitalized
This definition concerns borrowing, not the accounting treatment of construction interest. It does not assume every missed payment or deferment triggers capitalization.
$500 of interest added to $10,000 principal
Assume the contract permits this capitalization event.
- New principal: $10,000 + $500 = $10,500.
- At 6% simple annual interest on an unchanged balance, annual interest becomes $630 instead of $600.
Capitalization adds $500 to principal and $30 to the next illustrated year’s interest.
No repayments, further capitalization or fees during the following year; hypothetical constant rate.
The worked example uses the assumptions above. Related tools may model a different scope; check their descriptions before comparing results.
Unpaid interest is not always capitalized immediately
Student-loan rules vary and can change. Confirm the actual capitalization event with the servicer. The generic tool’s entered capitalization assumption is not a determination of eligibility for a federal repayment or forgiveness program.
Explore with a calculator
- Student Loan Calculator
Explore repayment and in-school assumptions; verify actual loan and capitalization rules separately.
Sources and checks
Definition and example arithmetic checked . Sources explain the concepts; numerical examples use the assumptions stated above.
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