If you’re thinking about buying a home, or you’ve been looking for a while and keep hearing about pre-approval, this is the plain-language explanation of what it actually is. Same walk-through I give my first-time buyers when we sit down together, just written out.
And if you’re planning to sell, worth reading too. You’ll see “pre-approved” on nearly every serious offer that lands on your kitchen table, and understanding what stands behind it is how you tell a strong offer from a shaky one.
What is a mortgage pre-approval?
A pre-approval is a letter from a mortgage lender that says: based on your income, your savings, your credit and your existing debts, we’re prepared to lend you up to a specific amount on specific terms.
It’s a promise made after real review, not a guess. The lender pulls your credit, looks at your pay stubs, reads your bank statements, and runs the numbers through their underwriting software. What comes back is a maximum loan amount and an estimated interest rate.
You attach the letter to any offer you write. It’s the seller’s proof that if they accept your offer, you can actually close on the house. The lender still has to approve the specific property later, usually through an appraisal, but your side of the equation is checked out in advance.
How does the lender come up with the number?
Less mysterious than it feels. Three inputs do most of the work.
Your income. Steady, documented income. For most buyers that’s W-2 pay. If you’re self-employed, the lender averages two years of adjusted gross income from your tax returns. Either way, they want to see enough to comfortably cover a monthly payment plus property taxes and insurance.
Your debts. Credit cards, student loans, car loans, and any other minimum monthly payments get added up. The lender uses a ratio called debt-to-income (DTI): total monthly debt payments divided by gross monthly income. For most conventional loans, that ratio needs to stay under about 45% including the new mortgage. If yours is higher, they’ll cap your loan amount so it fits.
Your credit. Most lenders can get you pre-approved with a score above 620, but the number I really want to see on my clients is 650 or higher. Here’s why. 650+ opens the door to a conventional loan, which is what actually wins in Milwaukee. Below that, you’re usually looking at an FHA loan, which is a real option and I’ve closed plenty of them, but FHA is government-backed and comes with extra property inspection requirements. Sellers here have gotten wary of that, and in a competitive situation they often pick a conventional offer over an FHA one even at a lower price. Above 740, you’re in the neighborhood of the best rates any lender will offer.
The output is a maximum loan amount and a rate estimate. Important: this is what you can borrow, not what you should. Look at the monthly number before you look at the ceiling.
Who can I get a pre-approval from?
Most of my first-time buyers assume their bank or their credit union is the right place to start. It feels safe, and it’s where their money already lives. That instinct isn’t wrong exactly, but in Milwaukee it usually isn’t the best move either. The reason is speed. Milwaukee is a heavy seller’s market, and the difference between winning and losing the house you love often comes down to how fast your lender can actually move.
Here’s how the four options really compare.
Independent mortgage brokers are where I send most of my buyers, and it’s not close. A good broker can rush underwriting, rush the appraisal, and, most importantly, issue you a fully underwritten pre-approval before you’re even under contract. Some can offer an appraisal waiver, which is a real advantage in a multiple-offer situation. Because a broker shops your application across many lenders instead of one, if your situation is unusual, they’ll find the lender that fits. I have a few brokers I trust and can introduce you to.
Banks are convenient, especially if you already have a relationship somewhere, and rates vary a lot from bank to bank. Where they run into trouble here is speed and flexibility. They generally can’t accelerate underwriting or an appraisal, they rarely issue a fully underwritten pre-approval upfront, and their options for anything out of the ordinary are limited. Not a bad choice for every buyer, but in a market where a fast, clean close matters, it shows up.
Credit unions often have the friendliest rates and lowest fees, and the experience is warmer than a big bank. You usually have to be a member (many have easy requirements). They’re built to serve members well, not to move fast, so the same speed constraint as banks applies here.
Online lenders I’d steer clear of. Slick app, competitive rate quotes, all digital. What breaks down is customer service, which is exactly what you need when something goes sideways during closing (and something usually does). Getting a real person on the phone can take days, and listing agents in Milwaukee have watched enough deals stall out with online lenders that a pre-approval letter from one often doesn’t carry the weight the buyer thinks it does.
What’s the difference between pre-qualification, pre-approval, and a commitment letter?
These three sound similar. They’re not.
Pre-qualification is a rough estimate. You tell a lender your income, savings, and debts over the phone or through a form, and they tell you approximately what you might qualify for. Nothing is verified. It takes twenty minutes. It carries very little weight when you’re writing an offer.
Pre-approval is what everything above describes. Real documents. Real underwriting review. A real letter with a real number. This is what you actually need in hand before you start writing offers.
A commitment letter (sometimes called a loan commitment) is the next step, and it comes only after you’re under contract on a specific house. It says the lender has approved not just you, but this exact loan on this exact property, and is ready to fund at closing. You’ll typically see it a couple of weeks before your closing date.
Sellers and their agents can tell the difference on incoming offers. A pre-qualification in a competitive situation reads as a maybe. A pre-approval reads as a yes.
So where do you start?
If you have a bank or a credit union you already like, start there. If you don’t, reach out and I’ll point you toward a few lenders I trust. The FAQ has answers to a few related questions too.
Emily
Debt-to-income and credit-score guidance in this post reflects standard conventional loan underwriting practice in 2026. Specific thresholds vary by lender, loan program, and market conditions. This is general education and not a substitute for advice from a licensed loan officer.
