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What is principal on a loan?
Principal is the amount still borrowed. Interest is the fee on that amount. Why a payment is never all principal.
Principal is the remaining borrowed amount. Interest is the fee charged on that remaining amount. A payment is split between the two.
Worked example
A $10,000 loan at 8 percent with a $200 payment does not reduce the loan by $200. Part of the $200 is interest for that period. Only the rest cuts principal. Early payments on a long loan are mostly interest. Later payments are mostly principal.
Why it matters
People divide the balance by the payment and get a payoff date that ignores interest. Principal is the part that actually shrinks the debt.
Questions people ask
Does extra money above the payment go to principal?
Usually yes, if you tell the servicer it is an extra principal payment and you are current. Ask the servicer. Do not assume.
Is a credit-card purchase principal?
The purchase becomes part of the balance. That balance is the principal the APR applies to if you do not pay in full.
What is a principal-only payment?
A payment that is applied entirely to the remaining borrowed amount, on top of the regular payment that already covers interest.
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