Glossary

Rule of 78

The Rule of 78 is an older interest-allocation method that front-loads interest, so settling early yields a smaller rebate than a simple pro-rata calculation.

2 min read

Front-loadedMore interest early
Smaller rebateOn early settlement

Definition

The Rule of 78 (sum-of-digits) weights interest towards the start of a loan, so more of your early payments are interest. If you settle early, the interest rebate under this rule is smaller than under a straight actuarial calculation. It is largely restricted on regulated consumer credit but can still appear in some commercial agreements.

In plain terms

It quietly means early repayment saves you less than you might expect, because you have already been charged much of the interest up front.

Why it matters for your company

If an agreement uses the Rule of 78, factor a slimmer rebate into any early-settlement decision. See early settlement figure and early-repayment charge.

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