Why is the early payment almost all interest?

Interest is charged on the balance still owed. At the start the principal is untouched, so the interest is large; as you pay it down, the interest share shrinks.

Which repayment type is better?

Equal-principal costs the least interest in total but the early payments are heavy. Equal-instalment keeps the same amount every month, which makes planning easy. Interest-only-until-maturity has the lightest monthly burden and the largest total interest.

Can it differ from a real loan?

Yes. Early-repayment fees, stamp duty and variable rates are not included. Treat it as a way to gauge the scale.

How much do I gain by paying a little extra each month?

Enter an amount and it appears immediately. On 100 million won at 4.5% over 30 years, equal-instalment, paying 500,000 won extra a month finishes 211 months sooner and saves about 53.8 million won of interest. Early-repayment fees vary by loan and are left out.

What does a grace period change?

During the grace period the principal does not fall and you pay interest only, so the total interest rises — on 100 million won at 4.5%, a 12-month grace period adds 4.5 million won of interest.

Loan repayment table

Name: 대출 상환표
Author: KarmoLab

Three methods compared · grace period · what paying extra saves · download the table

대출 상환표

원리금균등·원금균등·만기일시 상환을 비교하고 달별 원금·이자를 봅니다

대출 금액

연 이자율 (%)

기간 (개월)

상환 방식

거치기간 (개월) — 이자만 내는 기간

매달 더 갚기

월 상환액

₩506,685

총 이자

₩82,406,712

총 상환액

₩182,406,712

원리금균등총이자 ₩82,406,712 · 첫 달 ₩506,685

원금균등총이자 ₩67,687,500 · 첫 달 ₩652,778

만기일시총이자 ₩135,000,000 · 첫 달 ₩375,000

달별 상환표 — 처음 12개월과 마지막 달

1개월₩506,685 원금 ₩131,685 · 이자 ₩375,000 · 잔액 ₩99,868,315

2개월₩506,685 원금 ₩132,179 · 이자 ₩374,506 · 잔액 ₩99,736,136

3개월₩506,685 원금 ₩132,675 · 이자 ₩374,011 · 잔액 ₩99,603,461

4개월₩506,685 원금 ₩133,172 · 이자 ₩373,513 · 잔액 ₩99,470,288

5개월₩506,685 원금 ₩133,672 · 이자 ₩373,014 · 잔액 ₩99,336,617

6개월₩506,685 원금 ₩134,173 · 이자 ₩372,512 · 잔액 ₩99,202,444

7개월₩506,685 원금 ₩134,676 · 이자 ₩372,009 · 잔액 ₩99,067,768

8개월₩506,685 원금 ₩135,181 · 이자 ₩371,504 · 잔액 ₩98,932,586

9개월₩506,685 원금 ₩135,688 · 이자 ₩370,997 · 잔액 ₩98,796,898

10개월₩506,685 원금 ₩136,197 · 이자 ₩370,488 · 잔액 ₩98,660,701

11개월₩506,685 원금 ₩136,708 · 이자 ₩369,978 · 잔액 ₩98,523,994

12개월₩506,685 원금 ₩137,220 · 이자 ₩369,465 · 잔액 ₩98,386,773

360개월₩506,685 원금 ₩504,792 · 이자 ₩1,893 · 잔액 ₩0

첫 달 상환액의 74%가 이자입니다. 부대비용·중도상환수수료는 넣지 않았습니다.

A loan repayment table comparing equal-payment, equal-principal and bullet repayment. It includes a grace period and paying extra each month.

How to use it

Enter the amount, rate, term and repayment type
If there is a grace period, enter its months (interest only during it)
Put an amount in "Extra payment" to see the months and interest it saves
Use the three-way comparison to trade total interest against the first payment
"Show all" for every month, "Download the table" to open it in a spreadsheet

Common questions

Why is the early payment almost all interest?: Interest is charged on the balance still owed. At the start the principal is untouched, so the interest is large; as you pay it down, the interest share shrinks.
Which repayment type is better?: Equal-principal costs the least interest in total but the early payments are heavy. Equal-instalment keeps the same amount every month, which makes planning easy. Interest-only-until-maturity has the lightest monthly burden and the largest total interest.
Can it differ from a real loan?: Yes. Early-repayment fees, stamp duty and variable rates are not included. Treat it as a way to gauge the scale.
How much do I gain by paying a little extra each month?: Enter an amount and it appears immediately. On 100 million won at 4.5% over 30 years, equal-instalment, paying 500,000 won extra a month finishes 211 months sooner and saves about 53.8 million won of interest. Early-repayment fees vary by loan and are left out.
What does a grace period change?: During the grace period the principal does not fall and you pay interest only, so the total interest rises — on 100 million won at 4.5%, a 12-month grace period adds 4.5 million won of interest.

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