Once you know what question each number answers, comparing lenders gets a lot calmer.
This guide explains the most common mortgage terms in plain English and gives you a quick way to line up two offers in Safari (or any browser) without relying on gut feel.
The three “headline numbers” (and what they actually tell you)
Most lender pages and worksheets lead with three things: interest rate, APR, and monthly payment. Each one is useful, but only if you know its limits.
- Interest rate answers: “What’s the price of borrowing the money, before fees?” It drives your principal-and-interest (P&I) payment.
- APR answers: “What’s the rate-like cost after certain upfront lender fees are folded in?” It’s meant to help comparisons, but it’s not the whole story (more on that below).
- Monthly payment answers: “What will I likely pay each month?” But it can include different components depending on the quote (P&I only vs PITI).
A practical move: when you’re comparing two offers, confirm whether the “monthly payment” shown includes taxes and insurance or not.
APR in plain English: when it helps, when it misleads
But APR is only as fair as the assumptions behind it.
- APR helps when you’re comparing the same loan type and term (e.g., 30-year fixed vs 30-year fixed) and the quotes are for the same lock period and closing timeline.
- APR can mislead if you won’t keep the loan long. APR assumes you carry the loan for a long time, so it “spreads” upfront costs across many years.
- APR also won’t capture everything you care about, like property taxes, homeowners insurance, or whether your cash-to-close is comfortable.
If you’re likely to move, refinance, or pay down aggressively, focus more on cash to close and the first few years of payments than on APR alone.
Points, lender credits, and “buying” a rate
It helps to translate points into one simple question: How long until the lower payment pays back what I spent?
- Discount points: you pay them (upfront) to reduce the rate.
- Lender credits: the lender pays some costs (upfront) in exchange for a higher rate.
- Breakeven time: (extra upfront cost) ÷ (monthly savings). If breakeven is 6 years and you expect to refinance in 3, points may not be worth it.
One more nuance: sometimes a “no points” offer still has costs; it just means you didn’t pay optional discount points.
LTV and PMI: how your down payment changes the deal
- Higher LTV (smaller down payment) often means a higher rate and/or PMI (private mortgage insurance) for conventional loans.
- Lower LTV can reduce PMI costs, improve pricing, and sometimes make approval easier.
PMI itself is not “throwing money away” in every case. It’s a cost that can let you buy sooner or keep more cash on hand—just treat it as a real monthly expense when comparing options.
DTI: the approval metric that isn’t your budget
DTI (debt-to-income) is the percentage of your gross monthly income that goes to debt payments.
Lenders use DTI to decide whether you can reasonably handle the mortgage. You should use it as a warning light, not a target.
- Front-end DTI (sometimes used) looks at housing costs only.
- Back-end DTI looks at housing plus other debts (car loans, student loans, credit cards).
- Your budget should still consider what DTI doesn’t: childcare, commuting, medical costs, variable income, and your savings goals.
If you’re approved at the edge of your DTI limit, that doesn’t mean the payment will feel comfortable.
PITI, escrow, and cash-to-close: the “real payment” and the “real upfront”
PITI is Principal + Interest + Taxes + Insurance. If your quote shows only principal and interest, it can look artificially affordable.
Escrow means the lender collects taxes and insurance as part of your monthly payment and pays the bills when due.
- Escrow is not an extra fee; it’s a way of timing payments. But it changes your monthly number.
- Prepaids are items you pay upfront (like homeowners insurance premium, prepaid interest, and sometimes initial escrow funding).
- Cash to close is the big one: down payment + closing costs + prepaids − credits/earnest money already paid.
When two offers have similar rates, differences in cash to close can matter more than tiny payment differences.
A quick Safari workflow to compare two mortgage quotes (without getting lost)
This is a simple way to force apples-to-apples thinking using the documents you already have (Loan Estimates, worksheets, or emailed quotes).
- Step 1: Put both offers side-by-side. Open each quote in its own Safari tab (or split view if you prefer).
- Step 2: Write down the “same-loan basics.” Loan type (conventional/FHA/VA), term (30/15), rate lock length, and whether points/credits are included.
- Step 3: Compare three numbers in this order: (1) Cash to close, (2) PITI monthly payment, (3) APR.
- Step 4: Identify what’s driving the difference. Is it points, lender fees, title/settlement fees, or just taxes/insurance assumptions?
- Step 5: Ask one clarifying question per mismatch. Example: “Is this monthly payment P&I only or PITI?” or “How many points are included in this rate?”
If a lender can’t clearly answer those, that’s useful information too.
Takeaway: translate each metric into a question
Interest rate answers “what’s the borrowing price,” APR answers “what’s the borrowing price plus certain upfront costs,” LTV and DTI answer “how risky do you look on paper,” and PITI/cash-to-close answer “what will this feel like in real life.”
When you compare offers, start with cash to close and the real monthly payment, then use APR and points to understand how you’re paying for the rate.