So far in Mortgage 101, we've spent a lot of time on rates: what they are, how they're priced, why they move, and how to lock one. This one is about the step that comes before anybody shows you a rate worth comparing: getting pre-approved.
Or pre-qualified. Or "approved." Depending on who you ask, those might all mean the same thing. Or very different things.
And that's the first thing I want you to know.
The names aren't standardized
There's no rule that says a "pre-qualification" has to mean one thing and a "pre-approval" has to mean another. Lenders use these words differently. One lender's pre-qualification can be more thorough than another lender's pre-approval.
So the label at the top of the letter tells you a lot less than you'd think. What matters is what the lender actually looked at (with what criteria and judgment) before they wrote it.
What usually separates them
Best case scenario, here's how it tends to shake out:
A pre-qualification is usually based on what you verbally tell the lender: your income, your debts, maybe a rough idea of your credit. Sometimes there's a credit pull, sometimes there isn't. It's a ballpark or an educated guess. Useful for figuring out whether you're in the right neighborhood (literally), but nobody has verified a dang thang.
A pre-approval is usually based on what the lender has verified. Your credit has been reviewed. Your paystubs or LES, W-2s or tax returns, and account statements have been verified, and someone has run those numbers against the actual, current guidelines for the loan you'd be using.
Why the difference matters when you make an offer
When you make an offer, the seller and their agent are trying to answer one question: if we accept this, is it actually going to close?
A letter based on verified documents answers that question a heck of a lot better than one based on a phone conversation. When there's more than one offer on the table, that can decide whether yours gets taken seriously.
It matters for you, too. If nobody checked the numbers, you can fall in love with a house, go under contract, and THEN find out during underwriting that something doesn't work. Income gets calculated differently than you expected. A debt you forgot about shows up, or counts differently than you thought. Self-employment income looks very different once the write-offs come out. Finding that out before you shop is so much better than finding it out with your heart and earnest money on the line.
What a solid pre-approval actually looks at
When I pre-approve someone, I make sure we've covered:
Credit: an actual credit report, not an estimate.
Income: documented, and calculated the way the loan program calculates it. That isn't always how your paycheck reads.
Assets: enough for the down payment (if there is one), closing costs, and any reserves the loan requires, plus where that money came from.
Debts: everything on the credit report, and the things that aren't on it, like child support or alimony.
The loan program: VA, conventional, FHA and the rest each play by different rules, so the pre-approval should be for the loan you'll actually use.
If it's a more complex scenario than the standard guidelines account for, I'll go a step further and have an underwriter review the file up front. That's about as close to a bona fide "approved" as you can get before there's a specific house.
Neither one locks you in
This is the part people get nervous about, and they really don't need to.
Getting pre-approved with a lender doesn't obligate you to get your loan from that lender. It's not a contract. You can get pre-approved with one lender, compare that lender with others, and go with whichever one feels right for you.
The credit pull is the other worry. Be sure to ask the lender whether they perform soft or hard credit pulls at the pre-approval stage. Credit scoring models count multiple mortgage hard pulls within a short window as a single inquiry. For the older scoring models most mortgage lenders still use, that window is 14 days. So comparing a few lenders that complete hard pulls in that window doesn't rack up hits against you the way people fear.
A pre-approval isn't a promise, either
The flip side: a pre-approval is based on your situation the day it was established. It can change if:
your job or income changes
you open new credit or take on new debt (yes, including the new furniture/appliances/TV for the new house)
something about the property or the appraisal comes up
the verified data expires, which it eventually does
Nothing about that is a reason to wait. It's a reason to keep your lender in the loop while you shop.
The other sad-but-real fact: a pre-approval letter is only as good as the work behind it, and that work varies a LOT from one lender to the next. Ask what was actually verified before you trust the letter. Choose your lender wisely.
So which one do you need?
If you're just starting to wonder whether buying is realistic, a quick pre-qualification conversation is a perfectly fine first step. However, best practice is to start 3–6 months before you plan to shop with a trusted/vetted lender that performs a soft credit pull. Nobody needs to have it all figured out beforehand, and the best lenders link arms with you to get a grip on where you currently are and get you where you wanna go when the time is right.
When you're ready to look at houses for real, have a strong pre-approval letter from a quality lender, based on current, verified facts.
That will get you further than whatever label is printed at the top of the letter.

