It is Thursday night and you have three PDFs open in three browser tabs. They are laid out identically, the headings run in the same order, and the only number you feel qualified to compare is the one each lender put in the largest type: the interest rate. One says 6.125%. One says 6.375%. One says 6.625%. You are about to pick the smallest one and go to bed.
Here is what makes that a coin flip rather than a decision: the interest rate is not the price of the loan. It is one input to the price. The price is what borrowing costs you across the years you actually keep the mortgage — and the offer with the lowest rate is frequently the one you paid the most to get.
Here is the whole method, before the reasoning behind it. To compare mortgage offers, compare the cost of borrowing at the year you expect to sell or refinance — not the rate. Concretely:
- Get a Loan Estimate from at least three lenders, for the same loan type, amount and term. Anything that is not that form cannot be compared to one.
- On page 3 of each, take the “In 5 Years” total and subtract the principal you will have paid off. The difference is the cost of borrowing: everything you paid that did not reduce what you owe.
- Compare only the figures the lender controls — origination charges in Section A, the services in Section B, and the Section J lender credit, netted against your costs exactly once.
- Find the month the pricier-to-close offer overtakes the cheaper one, and check that month against how long you actually expect to keep the loan.
- Take the lowest Section A back to the other lenders and ask them to match it.
The good news is that doing this is not a matter of judgment. The form those three PDFs are printed on was designed, by regulation, to make lenders comparable, and most of the arithmetic is already sitting on page 3 of each one. The bad news is that the arithmetic it does for you stops at exactly five years, assumes you keep the loan forever, and splits one of the most important figures across two different sections, where it is easy to count twice.
That last part is where this usually goes wrong. Copying fifteen look-alike figures off three near-identical PDFs, netting the credits exactly once, and running the same schedule for each offer is not hard — it is fiddly and unforgiving, which is why the Mortgage / Loan-Offer Decision Helper exists: it ranks up to five Loan Estimates on the cost of borrowing at the year you expect to sell or refinance, and every field it asks for names the page and lettered section it came from. But the method matters more than the tool, so here it is either way.
What a Loan Estimate is, and why every lender’s looks the same
A Loan Estimate is the standardized three-page form a lender must give you after you apply for a mortgage, setting out the rate, the monthly payment, the closing costs, and the cash you will need at the table. The timing is specific: “The lender must provide you a Loan Estimate within three business days of receiving your application” (Consumer Financial Protection Bureau, What is a Loan Estimate? (opens in new tab)).
The sameness is the feature. Because every lender must use the same form with the same sections in the same order, you can lay three of them side by side and read straight down a column. The three pages do different jobs:
- Page 1 — the terms. Loan amount, interest rate, monthly principal and interest, whether each of those can increase after closing, the estimated total monthly payment, the estimated closing costs and the cash to close. The rate lock status and its expiry sit at the top.
- Page 2 — the itemized costs. Every fee, broken into lettered sections, plus the calculation that turns them into cash to close.
- Page 3 — the comparisons. The three summary numbers the form computes so you can put offers against each other, alongside the lender’s details and the servicing disclosures.
If a lender hands you something that is not this form — a rate sheet, a “worksheet”, a screenshot of a quote — you have not been given a Loan Estimate, and you cannot compare it to one. Ask again.
Why the interest rate is not the price of a mortgage
Page 3 gives you three summary numbers, and the single most useful habit in mortgage shopping is knowing which question each one answers — because none of them answers “what will this loan cost me?” on its own.
| Number on page 3 | What it answers | What it misses |
|---|---|---|
| Annual Percentage Rate (APR) | The cost of borrowing expressed as a rate, with upfront charges folded in | It spreads those upfront charges across the loan’s full scheduled term, so it flatters points if you move early |
| Total Interest Percentage (TIP) | Total scheduled interest over the life of the loan, as a percentage of the amount borrowed | Upfront fees, almost entirely — and it assumes you make every payment as scheduled to the end of the term |
| In 5 Years | Actual dollars: what you will have paid, and how much principal you will have paid off, after sixty payments | Any horizon that is not five years |
The definitions are the regulator’s, not ours. The CFPB describes APR as “a broader measure of the cost of borrowing money than the interest rate”, one that “reflects the interest rate, any points, mortgage broker fees, and other charges that you pay to get the loan” (CFPB on interest rate versus APR (opens in new tab)). TIP, meanwhile, “is calculated by adding up all of the scheduled interest payments, then dividing the total by the loan amount to get a percentage” — and, crucially, “does not include upfront fees, other than prepaid interest” (CFPB on the Total Interest Percentage (opens in new tab)).
Read those two side by side and the trap is obvious. APR counts the upfront fees; TIP does not. Both stretch their answer across the loan’s full scheduled term — and most buyers never reach it. “On average, borrowers keep a mortgage for about five years before moving or refinancing” (CFPB, Compare and negotiate your loan offers (opens in new tab)), which is a horizon neither number is built to answer.
Which leaves In 5 Years, the most under-used box on the form, because it is the only one denominated in money. The CFPB’s own instruction is to “locate the ‘In 5 years’ line in the Comparisons section. The first number shows you the total dollar amount (including principal) you will pay over five years. The second number shows you the amount of principal you will have paid off after five years” (CFPB, Compare and negotiate your loan offers (opens in new tab)).
Subtract the second from the first and you have the number that should be driving the decision: the cost of borrowing — everything you paid that did not reduce what you owe. Do that for all three offers and you have a real comparison, in real dollars, at a horizon a human being might actually reach.
Which Loan Estimate numbers actually vary by lender
Page 2 is long, and most of it is noise for comparison purposes. Property taxes, homeowner’s insurance premiums, prepaid interest and the initial escrow deposit are not the lender’s numbers — they are the county’s, the insurer’s and the calendar’s. Two lenders quoting different figures there are usually estimating the same underlying bill differently, not offering you a different deal.
The CFPB narrows it for you: “When comparing closing costs, focus on the fees that vary by lender. Those are the total origination charges in Section A, the services listed in Section B, and lender credits listed in Section J” (CFPB, Compare and negotiate your loan offers (opens in new tab)).
So the comparison set is short:
- Section A, Origination Charges — what the lender charges to make the loan, including any discount points.
- Section B, Services You Cannot Shop For — the lender’s chosen providers, which makes their prices effectively the lender’s choice.
- Section J, Lender Credits — money coming back the other way, described by the CFPB as “rebates to offset your closing costs” (CFPB, Compare and negotiate your loan offers (opens in new tab)).
- Section C, Services You Can Shop For — worth a glance, but since you can replace these providers yourself, a high quote here is a chore rather than a verdict.
If you want the fee-by-fee tour rather than the comparison, we have written separately about what closing costs actually cover. The monthly figure those fees sit alongside is principal, interest, taxes and insurance — worth separating in your head, because only the first two are the lender’s to compete on.
Everything else on page 2 goes in the “same for all three” bucket. If it genuinely is not the same for all three, that is a question for the lender rather than a reason to prefer one.
Points and lender credits are one lever pulled in two directions
Discount points and lender credits look like unrelated line items — one sits in Section A as a charge, the other in Section J as a credit — but they are the same mechanism running in opposite directions. Points are you paying cash today to buy the rate down. A lender credit is the lender paying you cash today in exchange for a higher rate.
That means two things.
- An offer’s closing-cost figure is meaningless without its rate beside it. The offer with the lowest cash to close is very often just the one that sold you the highest rate, and it will keep selling it to you every month for as long as you hold the loan.
- The credit is easy to count twice. It reduces Section J’s total and it reappears in the Calculating Cash to Close table on the same page. Net it against your upfront costs exactly once. If your comparison produces an offer that is somehow both the cheapest to close and the cheapest to hold, check this before you celebrate — it is usually the arithmetic rather than a bargain.
How to find the month a pricier offer overtakes a cheaper one
Once the rate and the upfront cost move in opposite directions, comparing them means finding the month the cheaper-to-hold offer has repaid its higher entry fee. Before that month, the offer that cost less at the table is genuinely ahead. After it, it is not. That month is the whole decision, and whether it falls before or after you expect to sell or refinance is the only thing you really need to know.
| Offer | Rate | Net upfront lender cost | Monthly P&I | Cost of borrowing, 5 years |
|---|---|---|---|---|
| A — no points, no credit | 6.375% | $3,200 | $2,495 | $126,828 |
| B — one point bought | 6.125% | $7,400 | $2,430 | $126,012 |
| C — $2,500 lender credit | 6.625% | $900 | $2,561 | $129,550 |
Three things fall out of that table, and none of them are visible from the rates alone:
- Offer C is the cheapest way to reach closing day and the most expensive loan of the three. It costs $2,300 less upfront than A and about $3,500 more than B by year five. If cash on the day is genuinely your constraint, that is a fair trade to make deliberately — it is just not a bargain.
- Offer B, the lowest rate, wins at five years by roughly $800. Not by much, and not immediately: it starts $4,200 behind A.
- B does not overtake A until month 51. Four years and three months. If you expect to be in this house for six years, B is right. Leave at year three and it is still about $1,150 behind; leave at year four and the point has very nearly paid for itself, trailing by a couple of hundred dollars. The premium only really costs you on an exit well before that.
That crossover month is the answer to the question you are actually asking, and the form does not compute it. Neither does the five-year box, which is why an offer can win at five years and lose at three. This is the arithmetic the Mortgage / Loan-Offer Decision Helper automates — it runs each offer’s own 360-month amortization schedule, finds the crossover, and checks it against the horizon you enter, so “will I be here long enough for the points to pay?” stops being a hunch.
When your mortgage insurance stops is a date you can compute
If you are putting less than 20% down, private mortgage insurance (PMI) is part of your monthly payment and it is not permanent — which means it does not belong in a thirty-year comparison as though it were. It has an end date, and under the federal rules the CFPB describes — the Homeowners Protection Act — that date is arithmetic rather than a negotiation.
There are two such dates, and they are different:
- The date you may ask. “You have the right to ask your servicer to cancel PMI on the date the principal balance of your mortgage is scheduled to fall to 80 percent of the original value of your home.”
- The date they must act. “[I]n general, your servicer must automatically terminate PMI on the date when your principal balance is scheduled to reach 78 percent of the original value of your home” — provided you are current on your payments.
Both quotes are the CFPB’s (when you can remove private mortgage insurance (opens in new tab)), and both hang on one defined term. “Original value” is not what your house is worth now: it “generally means either the contract sales price or the appraised value of your home at the time you purchased it, whichever is lower.”
Check which rules your loan is actually under before you rely on either date. The CFPB describes them as applying to mortgages for single-family principal residences that closed on or after July 29, 1999, and is explicit that government-backed loans are a different regime: “Mortgages through the Federal Housing Administration (FHA) or Department of Veterans Affairs (VA) have different requirements”, for which it says to ask your servicer. If one of the offers you are comparing is FHA or VA and the others are conventional, that is not a detail — you are comparing loans whose insurance stops on different rules, and an end date you assumed can quietly become the largest error in the comparison.
The practical consequence for comparing offers is this: two loans with different rates and different down payments reach 78% of original value in different months, so they carry different total amounts of mortgage insurance. That total is a real cost difference between the offers, and it is one nobody quotes you, because it falls out of the amortization schedule rather than off a rate sheet. Past that month the payment drops — which is also worth knowing before you budget the rest of the true cost of homeownership.
A rate lock is a deadline with a price on it
Page 1 tells you whether the rate is locked and when the lock expires. That expiry is not administrative trivia — it is the date the offer you are comparing stops existing.
Three offers at the same rate with different lock lengths are not the same offer. Closings slip for reasons that have nothing to do with you: an appraisal comes back late, the seller’s payoff statement is slow, the title search turns something up. If your lock expires first, you either extend it for a fee or take whatever the market is doing that morning.
So price it, roughly, the way you would price any other risk:
- How many days of cushion does each lock leave beyond your expected closing date?
- What does an extension cost — per day, or as a flat fee? Ask; it is rarely on the form.
- How likely is a slip in this particular transaction? A cash-clean purchase with a motivated seller is not a probate sale.
A thirty-day lock on a transaction that realistically needs forty-five is a discount you have not actually been given.
What to do once you have three offers side by side
First, get the offers at all. This is the step most people skip: the CFPB found that “almost half of consumers who take out a mortgage fail to shop prior to filling out an application for a mortgage”, and that “fewer than one out of four borrowers actually end up submitting a loan application to more than one lender or broker” (CFPB report on how few borrowers shop for a mortgage, January 2015 (opens in new tab)). That finding comes from the National Survey of Mortgage Borrowers, run jointly with the Federal Housing Finance Agency, covering people who took out a home purchase mortgage in 2013 — more than a decade old now, and best read as a description of a habit rather than a current statistic.
Then use them. The comparison is not only a way to pick a winner; it is leverage, and the CFPB says so plainly: “Your best bargaining chip is usually having Loan Estimates from other lenders in hand. Often, lenders are willing to match or beat their competitors’ offers” (CFPB, Compare and negotiate your loan offers (opens in new tab)).
The ask is concrete, and it is not “can you do better”. It is: here is Section A on your competitor’s estimate, and here is yours. Origination charges are the lender’s own money, which is exactly why they are the fees a lender can move.
Two closing thoughts on the shape of the decision:
- Score the things that are not money, separately. Responsiveness, whether the lock can float down if rates fall, whether they will waive the appraisal, whether anyone answers the phone on a Friday. These are real and they belong in the comparison — just not disguised as dollars.
- Let “too close to call” be an answer. If two offers sit within a few hundred dollars at your horizon, the money has told you it does not care. Decide on the lock, the float-down or the human being, and stop optimizing.
None of this tells you whether you should be buying a house at all this year, or whether the house you are under contract on survives a five-minute affordability check before the showing. Those are earlier questions. This one begins once you are already committed to borrowing and the only remaining variable is who you borrow from — which happens to be the one part of a home purchase where an evening’s arithmetic reliably changes the number.
When you are ready to run it properly, the Mortgage / Loan-Offer Decision Helper was built for exactly this evening: five offers, the cost of borrowing at three, five, seven and ten years and at the horizon you type in, the crossover month, the month your mortgage insurance stops, and the lock priced as a dollar figure. Bought once, and yours again at the refinance.
Common Questions About Comparing Mortgage Offers
Is the lowest interest rate always the cheapest mortgage?
No. The rate sets the interest you accrue, but what you hand over is the rate plus the upfront cost of getting it, and a lower rate is often bought with points that take years to earn back. Compare the cost of borrowing at the year you expect to sell or refinance, not the rate on the front page.
How many Loan Estimates should I get?
Enough that you can see a spread — three is usually a realistic number to collect in a week, and it is enough to tell an outlier from a market. Two offers tell you which is cheaper; three begin to tell you what the price actually is.
Does getting several Loan Estimates hurt my credit score?
Mortgage rate shopping is treated differently from opening several new accounts, on the reasoning that you are only going to buy one home. The CFPB puts the window at 45 days: “Within a 45-day window, multiple credit checks from mortgage lenders are recorded on your credit report as a single inquiry” (CFPB, what happens when a mortgage lender checks my credit (opens in new tab)). Keep the shopping compressed inside that window — and if it runs past, the CFPB’s own advice is that one more inquiry is a small cost against what comparing offers can save you.
What if two offers come out nearly identical?
Then the money is not the deciding factor and you should stop pretending it is. Decide on the rate lock length, the willingness to float down, the closing certainty, and how the lender behaved the first time you asked them a hard question.
Sources
- Consumer Financial Protection Bureau — What is a Loan Estimate? (opens in new tab)
- Consumer Financial Protection Bureau — Loan estimate explainer (opens in new tab)
- Consumer Financial Protection Bureau — Compare and negotiate your loan offers (opens in new tab)
- Consumer Financial Protection Bureau — What is the Total Interest Percentage (TIP) on a mortgage? (opens in new tab)
- Consumer Financial Protection Bureau — Interest rate versus annual percentage rate (opens in new tab)
- Consumer Financial Protection Bureau — When can I remove private mortgage insurance (PMI) from my loan? (opens in new tab)
- Consumer Financial Protection Bureau — What happens when a mortgage lender checks my credit? (opens in new tab)
- Consumer Financial Protection Bureau — Report finds nearly half of borrowers do not shop for a mortgage (January 2015) (opens in new tab)
Disclaimer: This post is for informational and educational purposes only and does not constitute financial, tax or legal advice. Loan pricing, mortgage insurance rules and rate lock terms vary by lender, loan program and state, and the figures used here are illustrative rather than quotes — consult a licensed mortgage professional, financial advisor or attorney before making decisions based on this content.
