상업용·사모 대출 브로커를 위한 365/360 대출 계산기

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365/360 method

An interest-accrual method that computes a daily rate by dividing the annual rate by 360, then charges it for every actual day of the year. The borrower pays 365 days of interest at a 360-day rate, so the true cost is about 1.4% higher than the stated rate — 6.5% nominal works out to about 6.59% simple. Common in commercial loans.

Day-count convention

The rule a loan uses to turn an annual rate into interest for a given period — which year length is the divisor and which days are counted. Common conventions are 30/360, actual/365 (365/365) and actual/360 (365/360). The same nominal rate produces different interest under each, so the convention belongs in any loan comparison.

Daily rate

The interest rate charged per day. Under 365/360 it is the annual rate divided by 360; at 6.5%, about 0.018056% a day. Multiplied by the balance and the days in the period, it gives the interest due. This calculator uses an average month of 365/12 days to convert it to a monthly rate.

Nominal interest rate

The stated annual rate in the loan documents, before accounting for the day-count method or compounding. Under 365/360, the rate actually earned by the lender is higher than the nominal rate. Two loans quoted at the same nominal rate can cost different amounts if they accrue interest differently.

Effective annual rate

The true yearly cost once the day-count premium and monthly compounding are included. For a 6.5% nominal rate under 365/360, this calculator shows about 6.793%, versus about 6.697% for the same rate charged as a simple monthly 1/12. It is the fairest single number for comparing loans that accrue differently.

30/360 method

A convention that treats every month as 30 days and the year as 360, so monthly interest is simply the annual rate divided by 12 — the standard for most U.S. residential mortgages. This calculator uses it as the baseline for “extra interest vs 30/360”. On $100,000 at 6.5% over 10 years, the 365/360 premium is about $552.

Amortization

Paying off a loan through equal scheduled payments that each cover that period’s interest plus part of the principal, so the balance reaches zero by the last payment. Under 365/360 each payment carries slightly more interest, so the level payment is higher than under 30/360 for the same nominal rate and term.

Balloon payment

A large lump sum due at maturity when a loan’s payments are based on a longer amortization than its actual term, a common structure in commercial lending where 365/360 is also typical. This calculator assumes full amortization over the term you enter, so it does not show a balloon balance.