Calculator Inputs
Enter mortgage, income, escrow, arrears, and proposed modification details. Results appear above this form after submission.
Formula Used
The calculator uses a HAMP-style affordability workflow. It is an estimate, not a lender decision.
| Formula | Meaning |
|---|---|
| Monthly P&I = P × r(1+r)n ÷ ((1+r)n − 1) | P is interest-bearing principal. r is monthly interest. n is months. |
| Target Housing = Monthly Gross Income × Target Ratio | This estimates the affordable housing payment limit. |
| Target P&I = Target Housing − Escrow − HOA | This finds the available principal and interest amount. |
| Capitalized Balance = UPB + Arrears + Fees − Forgiveness | This estimates the balance after adding eligible past due amounts. |
| Forbearance Estimate = Capitalized Balance − Affordable Principal | This estimates principal that may need deferred treatment. |
How to Use This Calculator
- Enter the unpaid principal balance and current mortgage rate.
- Add monthly gross income before taxes.
- Enter taxes, insurance, and association dues separately.
- Add arrears and fees that may be capitalized.
- Choose a target housing ratio, such as 31 percent.
- Test a modified rate and a longer repayment term.
- Review the payment, ratio, relief, and forbearance estimate.
- Download CSV or PDF results for comparison.
Example Data Table
| Scenario | UPB | Income | Target Ratio | Modified Rate | Term | Escrow |
|---|---|---|---|---|---|---|
| Base Review | $240,000 | $6,500 | 31% | 2.00% | 480 months | $620 |
| Higher Income | $240,000 | $7,200 | 31% | 2.50% | 480 months | $620 |
| Forbearance Test | $255,000 | $6,000 | 31% | 2.00% | 480 months | $700 |
What This Calculator Estimates
A HAMP loan modification calculator helps test a possible mortgage relief plan. It uses income, escrow, arrears, rate, and term data. The goal is to estimate a lower housing payment. This page follows a HAMP style affordability approach. It targets a front end debt ratio chosen by the user. Many people use 31 percent as a common benchmark. The result is not an approval decision. It is a planning estimate for discussion.
Why Affordability Matters
Loan modification work begins with monthly cash flow. A lender reviews the payment, gross income, taxes, insurance, and hardship facts. The calculator compares the current housing cost with a proposed modified payment. It also estimates payment relief and a target payment gap. If the new payment is still above the target, the tool estimates possible principal forbearance. Forbearance does not erase debt. It may become due at sale, refinance, payoff, or maturity. Forgiveness is different. It permanently reduces the balance entered in the model.
How The Waterfall Works
A HAMP style waterfall often starts with capitalizing arrears. Then the rate may be reduced. The term may be extended. Principal forbearance may be tested when needed. This calculator lets you model each step. You can change the term up to long modification periods. You can test a low rate, add escrow, and include homeowner association dues. The chart shows balance, cumulative interest, and total housing cost over time. CSV and PDF exports help compare scenarios. Keep records of every estimate. Then review actual options with your servicer or housing counselor. Small changes can affect the final payment.
Important Limits
The tool cannot judge eligibility, title issues, investor rules, credit policy, or document quality. It also cannot predict foreclosure timelines or legal rights. HAMP was a legacy program, so this page is best used for historical, educational, or HAMP style comparisons. Modern assistance rules can differ. Always compare the estimate with current servicer guidance. Use conservative inputs. Check income before taxes. Separate escrow from principal and interest. Enter arrears only when they may be capitalized. Review the forbearance figure carefully. A lower monthly payment can still create a balloon amount later, in writing.
FAQs
1. What does this calculator estimate?
It estimates a HAMP-style loan modification payment, target affordability, payment relief, possible forbearance, total interest, and housing ratios. It is for planning only.
2. Is this an official approval tool?
No. It does not approve, deny, or verify eligibility. A servicer, investor, or housing counselor must review actual program rules and documents.
3. What is the target housing ratio?
It is the chosen percentage of gross monthly income used for housing costs. Many HAMP-style examples use 31 percent as a benchmark.
4. What is principal forbearance?
Principal forbearance is debt that may be delayed instead of paid monthly. It may still be due later at payoff, sale, refinance, or maturity.
5. What is principal forgiveness?
Principal forgiveness permanently reduces the balance in this model. It is different from forbearance and depends on rules, investor approval, and servicer policy.
6. Why include escrow and HOA dues?
Escrow and dues affect the full housing payment. A lower principal and interest amount may still be unaffordable if escrow costs are high.
7. Can I export my results?
Yes. After calculation, use the CSV or PDF button. The files help compare scenarios or prepare notes for counseling discussions.
8. Why does my result show extra forbearance?
The proposed payment may exceed the target housing amount. The calculator estimates extra forbearance needed to move the payment closer to target affordability.