Real numbers by loan size. Not estimates — actual payment math at each rate level. Built by a banking professional who reviewed these numbers daily.
| Loan Amount | At 7.0% | At 6.5% | Monthly Savings | 30-Year Savings |
|---|---|---|---|---|
| $200,000 | $1,331 | $1,264 | $67/mo | $24,120 |
| $300,000 | $1,996 | $1,896 | $100/mo | $36,000 |
| $400,000 | $2,661 | $2,528 | $133/mo | $47,880 |
| $500,000 | $3,327 | $3,160 | $167/mo | $60,120 |
| $600,000 | $3,992 | $3,792 | $200/mo | $72,000 |
| $800,000 | $5,323 | $5,056 | $267/mo | $96,120 |
| Loan Amount | At 7.0% | At 6.0% | Monthly Savings | 30-Year Savings |
|---|---|---|---|---|
| $200,000 | $1,331 | $1,199 | $132/mo | $47,520 |
| $300,000 | $1,996 | $1,799 | $197/mo | $70,920 |
| $400,000 | $2,661 | $2,398 | $263/mo | $94,680 |
| $500,000 | $3,327 | $2,998 | $329/mo | $118,440 |
| $600,000 | $3,992 | $3,597 | $395/mo | $142,200 |
| $800,000 | $5,323 | $4,796 | $527/mo | $189,720 |
| Credit Score | Typical Rate | Payment on $400K | vs 740 Score | 30-Year Cost |
|---|---|---|---|---|
| 580-619 | ~7.8% | $2,873 | +$475/mo | +$171,000 |
| 620-659 | ~7.5% | $2,797 | +$399/mo | +$143,640 |
| 660-699 | ~7.1% | $2,693 | +$295/mo | +$106,200 |
| 700-719 | ~6.8% | $2,614 | +$216/mo | +$77,760 |
| 720-739 | ~6.4% | $2,504 | +$106/mo | +$38,160 |
| 740+ | ~6.1% | $2,398 | Best rate | Baseline |
The difference between a 580 score and a 740 score on a $400,000 mortgage is $475/month — or $171,000 over 30 years. Same house. Same bank. Different number.
Enter your current score and loan amount — see exactly what improvement would save.
📊 Simulate My Score → 🏦 Ask ZaiP&I only. Rates are illustrative based on typical market spreads by credit tier. Actual rates vary by lender, loan type, and market conditions. Not financial advice.
Numbers like these tell you what you can afford. They cannot tell you whether a lender will say yes — and that varies more than almost anyone realises. In the complete 2025 federal record, approval rates across the 100 largest FHA lenders ran from 98.2% down to 21.3%. Same program, same year.
And it is not simply who applies where: holding state, loan amount, income, debt-to-income and loan-to-value constant, applicant mix explains only a 2.7× range in expected outcomes.
CFPB HMDA 2025, computed by FinanceRateCalc · rates reflect applicant mix as well as lender practice · historical observation, not a prediction · free, CC BY 4.0.