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The current rate lasts for the entered months, then the new rate applies to remaining principal and term. The schedule and budget show the same scenario; it does not forecast bank decisions.

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monthly rate = annual nominal rate / 12payment = balance × r × (1+r)^n / ((1+r)^n − 1)remaining interest = payment × months − balanceWorked example
Worked example using the form's default values.
The current rate lasts for the entered months, then the new rate applies to remaining principal and term. The schedule and budget show the same scenario; it does not forecast bank decisions.
Use the same amount, horizon, dates and cost basis. Check whether the result is monthly or annual and what it includes. The comparison does not select offers or guarantee their availability.
A save is a snapshot. Load and recalculate it explicitly; the original remains a separate save. Check year, dates, units and assumptions before comparing.
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Sources, retrieval dates and the next review are in the methodology. You enter prices, returns and forecasts. The calculator does not fetch offers or confirm individual eligibility.
The current rate lasts for the entered months, then the new rate applies to remaining principal and term. The schedule and budget show the same scenario; it does not forecast bank decisions.