Mortgage Credit Impact Simulator
Mortgage pricing follows a published grid based on your credit-score band, your loan-to-value, and a handful of property and loan-feature add-ons. Adjust the inputs to see what each piece is worth in rate, monthly payment, and lifetime interest.
Your scenario
Purchase price for a buy, current value for a refinance
Implied down payment: $100,000 (20.0%). LTV 80.0% (75.01% to 80%)
Mainstream pricing tier
Illustrative example rate. Not an available or quoted rate. The undiscounted rate before LLPAs.
Loan amount above the conforming limit in your county
A second lien (HELOC or piggy-back) behind the first mortgage
Plain-English summary
At 680 to 699, your total LLPA is 1.75 pts which translates to about 7.438%. Moving to 700 to 719 would save roughly $17 per month and $6,141 over the life of the loan, before any other lender or program differences.
Your current pricing
Score scenarios
How pricing changes if you move up one band, two bands, or all the way to top tier.
| Scenario | Score band | Total LLPA | Est. rate | Monthly P&I | Savings vs current |
|---|---|---|---|---|---|
| Current | 680 to 699 | 1.75 pts | 7.438% | $2,780 | Baseline |
| +20 (next bucket) | 700 to 719 | 1.5 pts | 7.375% | $2,763 | $17 / mo $6,141 lifetime |
| +40 (two buckets up) | 720 to 739 | 1.125 pts | 7.281% | $2,737 | $43 / mo $15,325 lifetime |
| Next major threshold (780+) | 780 or higher | 0.375 pts | 7.094% | $2,686 | $93 / mo $33,594 lifetime |
Pricing references the Fannie Mae Loan-Level Price Adjustment Matrix effective 2023-05-01. LLPAs are translated approximately into rate or fees using the rule of thumb that 1.0 point is worth roughly 0.25% of rate on a 30-year fixed. Actual lender pricing varies.
Educational estimate. Not a credit decision, not a loan offer, and not a rate quote. Lender pricing varies.
Keep a free guide for your next step
Prepare questions and organize your budget with the free fillable First-Time Buyer Playbook. No email or signup required.
Download free guide (PDF)More credit calculators
Middle Score Calculator
Illustrate a common middle-score selection method using same-model bureau scores. Actual lender and program rules vary.
Use middle score calculatorUtilization Paydown Simulator
Estimate how paying credit-card balances under common utilization thresholds may move your score band.
Use utilization paydown simulator calculatorMortgage Credit Readiness Simulator
Guided walk-through that combines scores, debts, and timeline into a single readiness verdict.
Use mortgage credit readiness simulator calculatorFrequently asked questions
What does the Mortgage Credit Impact Simulator estimate?
Will improving my credit score lower my mortgage rate by this amount?
Related glossary terms
Was this helpful?
Was this helpful?
Want the story behind the numbers?
More credit calculators
Middle Score Calculator
Illustrate a common middle-score selection method using same-model bureau scores. Actual lender and program rules vary.
Use middle score calculatorUtilization Paydown Simulator
Estimate how paying credit-card balances under common utilization thresholds may move your score band.
Use utilization paydown simulator calculatorMortgage Credit Readiness Simulator
Guided walk-through that combines scores, debts, and timeline into a single readiness verdict.
Use mortgage credit readiness simulator calculator