Loan Modification Calculator: Will a Modified Mortgage Actually Help?

A loan modification changes the terms of your existing mortgage — interest rate, loan term, principal balance, or a combination — to make monthly payments more affordable. But not every modification provides meaningful relief. Some reduce the payment by extending the term to 40 years, producing marginal monthly savings while costing dramatically more in total interest over the loan life. Others achieve the target DTI on paper while still leaving a payment that cannot survive a 20% income reduction — the most common reason modifications fail within 12 months. This calculator compares your current mortgage against proposed modified terms across every dimension that matters for a real decision: new monthly payment, front-end and back-end DTI, total interest paid over the loan life, interest savings versus cost, break-even analysis, and a stress test of whether the modified payment is actually sustainable. It also models the key alternatives — refinancing, selling, short sale — so you can compare outcomes rather than accepting the first offer. A modification is only worth accepting if it creates genuine payment sustainability — not just temporary relief. The numbers tell you which outcome you are actually accepting before you sign anything.