2 min read
Definition
Flat-rate interest is calculated on the sum originally borrowed and charged across the whole term, even as the balance is repaid. Because you keep paying interest on money you no longer owe, the effective cost is far higher than the headline flat rate suggests.
Why it matters
A flat rate always understates cost; its APR is typically nearly double. Always convert before comparing against a reducing-balance loan. See flat rate vs APR.
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