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Variable Rate Loan Simulator

See how a rate change could affect monthly payments, interest, and the remaining balance.

Everything runs in your browser. Nothing is sent to the server.

Current rate

Monthly payment (first year)
92,414円
Total interest
3,268,886円
Total payment
33,268,886円

New rate

Monthly payment (first year)
103,536円
Total interest
7,272,983円
Total payment
37,272,983円

Cumulative total repayment

Cumulative total repaymentTime

Before / after yearly comparison

YearCurrent rate · Annual paymentNew rate · Annual paymentBalance beforeBalance after
11,108,963円1,242,433円29,098,147円29,202,097円
21,108,963円1,242,433円28,189,961円28,392,142円
31,108,963円1,242,433円27,275,398円27,569,954円
41,108,963円1,242,433円26,354,412円26,735,348円
51,108,963円1,242,433円25,426,958円25,888,137円
61,108,963円1,242,433円24,492,991円25,028,130円
71,108,963円1,242,433円23,552,465円24,155,133円
81,108,963円1,242,433円22,605,335円23,268,951円
91,108,963円1,242,433円21,651,553円22,369,385円
101,108,963円1,242,433円20,691,073円21,456,232円
111,108,963円1,242,433円19,723,849円20,529,287円
121,108,963円1,242,433円18,749,832円19,588,342円
131,108,963円1,242,433円17,768,975円18,633,186円
141,108,963円1,242,433円16,781,230円17,663,603円
151,108,963円1,242,433円15,786,548円16,679,376円
161,108,963円1,242,433円14,784,882円15,680,284円
171,108,963円1,242,433円13,776,181円14,666,102円
181,108,963円1,242,433円12,760,396円13,636,602円
191,108,963円1,242,433円11,737,479円12,591,553円
201,108,963円1,242,433円10,707,377円11,530,720円
211,108,963円1,242,433円9,670,042円10,453,865円
221,108,963円1,242,433円8,625,422円9,360,745円
231,108,963円1,242,433円7,573,467円8,251,115円
241,108,963円1,242,433円6,514,124円7,124,726円
251,108,963円1,242,433円5,447,341円5,981,325円
261,108,963円1,242,433円4,373,068円4,820,654円
271,108,963円1,242,433円3,291,250円3,642,453円
281,108,963円1,242,433円2,201,835円2,446,457円
291,108,963円1,242,433円1,104,769円1,232,397円
301,108,963円1,242,433円0円0円

This is a general principal-and-interest estimate. It does not apply lender-specific rules such as five-year payment reviews or 125% caps. Confirm the result with your lender before making a decision.

What it does

Compare a plan that keeps the current rate with one that uses the new rate from now. The estimate is calculated locally and shows the payment and balance path year by year.

How to use it

  1. Enter your remaining balance and term.
  2. Enter the current and new interest rates.
  3. Compare the two lines and the yearly table.

Tips

  • Try several new-rate scenarios to see the range of outcomes.
  • Lender rules and fees can change the actual repayment schedule.
  • Nothing is sent to a server.

FAQ

Does this use my bank's rules?

No. It is a general amortization estimate. Check your loan agreement and lender for the actual rules.

What would make this more useful?

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