Penalty estimate inputs
Many lenders use the higher of three months interest or an IRD-style calculation. Use this to estimate the penalty before deciding whether a refinance still makes sense.
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Penalty structure
This calculator separates the penalty into three-month interest and IRD-style logic so you can see which one is dominating.
Refinance context
Use the comparison and new-rate fields to judge whether the expected savings still outweigh the penalty.
Planning estimate
Lender formulas differ, so this is best used as a planning tool before requesting a lender-specific payout statement.