#mortgage

We ran two versions of the same combined-income household through the qualifying math, changing only one partner's monthly debt by $2,000 — the back-end DTI moves from 41% (qualifies) to 61% (likely doesn't).

We ran a $350K home at 90% LTV with a $200/month PMI premium through the calculator — a $300/month extra principal payment reaches the 80% removal threshold 10 months sooner, beating a modest investment-return assumption on the same money.

We ran 1.5 points on a $450,000 loan at 6.75% through the calculator — the $6,750 upfront cost breaks even well before 12 years, but turns into a pure loss for a buyer who sells or refinances within 2-3 years.

We ran a $250K mortgage locked in at 3.5% against a $40,000 kitchen remodel — a cash-out refi at today's 6.8% resets the entire balance, while a HELOC leaves the cheap rate untouched. Over 7 years, the HELOC wins by a wide margin.

A lower monthly payment and lower lifetime interest usually point the same direction. We found the exact trap where they don't: refinancing into a fresh 30-year term can drop the payment while raising total interest paid.

Banks approve based on debt-to-income ratios. They don't care about retirement, kids, or whether you'll be house-poor. Here's the gap between 'qualified' and 'comfortable' on a $100K salary.

Between PMI thresholds, credit-score rate tiers, and the actual dollar impact of rate shopping, the mortgage calculator's inputs matter more than most buyers realize. We broke down what each one is actually worth.