Mortgage Modification Calculator
Calculate your new monthly payment after a permanent loan modification. Compare rate reduction, term extension, and principal forbearance options — with full lifetime cost comparison and qualification checklist.
There are five types of permanent loan modification. Most approved modifications use a combination approach — whatever achieves the target payment most efficiently.
A lower monthly payment does not always mean lower total cost. Here is the full lifetime comparison of your original vs. modified loan terms.
Rate: 7.5%
Term: 22 years remaining
Total interest: $297,742
Total cost: $582,742
Payoff year: 2048
Rate: 5.5%
Term: 30 years
Total interest: $297,552
Total cost: $582,552
Payoff year: 2056
How to Use the Mortgage Modification Calculator
This calculator analyzes permanent loan modification — a change to your mortgage terms to reduce your monthly payment. It is distinct from forbearance (a temporary pause on payments).
Quick Calculator
Enter your current balance, current rate, current payment, remaining term, plus your new modified rate and new modified term. The calculator shows your new payment, monthly savings, and whether the modification costs more or less in total interest over the full term.
Advanced: Modification Types, Qualification, Trial Period
The Modification Types tab explains all five types — rate reduction, term extension, principal forbearance, principal reduction, and combination — with your specific impact for each. The Qualification tab provides a checklist with your income and expenses to assess likelihood of approval. The Trial Period tab walks through the 3-month trial payment requirement before permanent modification is granted.
Pro: Total Cost Comparison, Credit Impact, Re-Default Risk
The Total Cost Comparison shows original vs. modified lifetime cost — some modifications cost more in total interest despite a lower payment. The Credit Impact tab explains how modification is reported to bureaus and what it means for future borrowing. The Re-Default Risk tab estimates your stability and provides specific steps to take when modification alone is not enough.
How Loan Modification Savings Are Calculated
Monthly Savings = Current Payment − New Payment
Original Total Cost = Current Balance + Total Interest (current terms)
Modified Total Cost = Modified Balance + Total Interest (new terms)
+ Principal Forbearance (still owed at payoff)
Example: $285,000 at 7.5% with 22yr remaining → 5.5% for 30yr
Current payment: ~$2,100/mo
New payment: $1,618/mo
Monthly savings: $482/mo
But: 30yr term adds 8 extra years vs 22yr remaining
Extra interest: +$87,000 over the extended term
This is the fundamental tradeoff of loan modification: lower monthly payment, but often higher total cost due to term extension. Understanding this tradeoff helps borrowers make an informed decision — and it almost always favors modification over foreclosure.
Example: Combination Modification on a $285,000 Balance
$285,000 at 7.5% with 22 years remaining — modified to 5.5% for 30 years
| Current Balance | $285,000 |
| Current Rate / Term | 7.5% / 22 years remaining |
| Current Monthly Payment | $2,100 |
| Modified Rate / Term | 5.5% / 30 years |
| New Monthly Payment | $1,618 |
| Monthly Savings | $482/mo |
| Annual Savings | $5,784 |
| Original Total Interest | ~$239,000 (22yr remaining) |
| Modified Total Interest | ~$297,000 (30yr at 5.5%) |
| Extra Long-Term Cost | +$58,000 |
| Trial Period | 3 payments of $1,618 |
This borrower saves $482/month immediately — preventing a likely foreclosure — while paying $58,000 more over the life of the loan. If the home appreciates and can be refinanced in 5 years once the borrower's situation stabilizes, the extra long-term cost may never be incurred.