What You Need to Know About Credit Before You Buy a House

Here’s the line I hear all the time: “I need perfect credit to buy a home.”

Not true. I say it in Episode 6 and I’ll say it here: FHA works at 580 credit with 3.5% down. Below 580, it’s 10% down. Under 500, you’re not eligible. No income limits — that’s true for FHA itself — and it’s for your primary residence only.

But “580 gets you in” is not the whole story. Your score decides which loans you can get, what rate you pay, and whether you need down payment assistance to work at all. So here’s the map — the tiers, what each one unlocks, and what actually moves your score.

This episode, I talked it through with Stef Beltran del Rio from 360 Credit Consulting — she’s a FICO-certified credit expert, and most of what follows comes from that conversation.

The tiers that matter

A few honest notes. First, lender overlays exist: FHA’s minimum is 580, but many lenders want 620 or higher. I’m a broker — I shop lenders that go to FHA’s actual minimums instead of adding their own. Second, these are floors, not guarantees. A 640 with a lot of debt is a different file than a 640 with no debt. The score opens the door; the rest of your file decides what happens inside.

And don’t quote a conventional payment for a 620-credit buyer using a top-tier rate. The headline rate — 7.18% conventional, Freddie Mac, week ending November 5, 2026 — is the average for strong-credit borrowers. Your rate depends on your score.

What actually moves a mortgage score

Six things. In order of how much I see them matter:

1. Payment history. Pay on time, every time. One 30-day late can cost you more than you’d think, and it stays on the file for years. This is the single biggest lever — about 35% of a FICO score.
2. Utilization. How much of your available credit you’re using. Under 30% of your limit is the rule — under 10% is better. Paying a card down from 80% used to 10% used is the fastest score move I see.
3. No new accounts before applying. Every new account is a new inquiry and a younger average account age. Do not open a store card for the discount while you’re house shopping.
4. Don’t close old cards. Closing your oldest card shortens your credit history and kills available credit — both push your score down. Length of history is about 15% of your score.
5. Fix errors. Pull your reports, find the mistakes, dispute them. Wrong late payments and accounts that aren’t yours are more common than people think.
6. Authorized-user effects. Being added to someone else’s card can help or hurt depending on how they use it. Know what you’re signing up for before you ask.

Credit mix — having both revolving credit (cards) and installment loans (auto, student, mortgage) — is about 10% of your score. If you only have cards and no installment loan, one option people use is a small self-funded installment loan, like Self: you borrow a small amount from yourself, pay it back over 12 to 24 months, and it counts as an installment loan while you build savings at the same time.

Three credit myths that cost buyers money

Myth 1: “Pay off all of your collections.” Paying a collection updates its date of last activity — and the newest accounts on your report hit the hardest. In some cases, paying it off just made it a brand-new collection on your report. Talk to a credit advisor before you pay anything off.

Myth 2: “Apply for more credit cards to build credit.” Length of credit history is 15% of your score, and it’s the average age of your accounts. If you’ve had one card open for 20 years and you open a brand-new one, you just cut your average history in half. One longstanding card, paid on time every month, is worth more than a wallet full of new ones.

Myth 3: “Credit Boost will raise my score.” Credit Boost is a bureau product built on the VantageScore model. It only moves the online scores — your lender never sees it, because it’s not part of the FICO model. And to get it, you hand the bureaus your utility bills and subscription payments — data they can use for ads or sell. It does nothing for your mortgage score.

One more: don’t assume there’s a shopping window that protects your score. A lot of buyers believe they can have their credit pulled by several lenders while rate-shopping and it won’t hurt them. A lender pull costs you points — so know where your score stands before you let anyone pull it, and don’t go in blind hoping the lender will tell you what to fix.

What NOT to do in the 90 days before you apply

• Don’t open new credit of any kind — no cards, no car loan, no furniture financing.
• Don’t co-sign anything for anyone.
• Don’t move money around in ways you can’t document. Big unexplained deposits get questioned.
• Don’t quit your job or switch to a new one without telling me first. Income stability is part of the file.

How early should you start working on credit?

Credit takes time, so start early. If you don’t have a credit card at all, you’re missing out on about 30% of your overall credit score — and it takes three to six months for a new card to start helping your score. If you’ve neglected your credit or never paid attention to it, start about a year before you want to apply. If you’ve been monitoring it all along, six months out is usually enough to maximize the positive credit you’ve built.

And if you’re under 720, talk to a credit advisor. You might have good credit, but you don’t have great credit — and the difference between good and great is real money over the life of a home loan. A small change — paying down one card, fixing one error — can be the difference between the rate you want and the rate you get.

For parents: if your kid turns 18, opening a credit card with them is one of the best ways to start their credit history early — and to teach them the consequences of a late payment while the stakes are still small. Also look into credit monitoring for your kids while they’re under 18. Identity theft targets minors more than most people realize, and nobody finds out until the kid turns 18 and tries to get a phone or a loan and discovers they don’t have no credit — they have bad credit.

What if your score is below 580?

Then the work starts before the house hunt. Pay down the cards, get current on anything past due, dispute the errors, and give it time. I’d rather tell you the truth now — “you’re 40 points away, here’s the plan” — than watch you lose a house in escrow. Get pre-approved early and I’ll tell you exactly where you stand and what to fix first.

Dat’s take

Your credit score isn’t a grade on you as a person. It’s a number with levers — and every lever on this list is one you can pull.

What to do with this

1. Pull your credit reports and dispute anything wrong. It’s free, and it’s the cheapest score improvement there is.
2. Get your card balances under 30% — under 10% if you can — before you apply.
3. Work through the credit checklist in my tools section — the six levers above, plus the 90-day don’t-do list.
4. Start your pre-approval on the pre-approval page and I’ll tell you your real mortgage score and which tier you’re in.
5. If your score is under 680, read FHA Loan in 2026: What It Actually Costs Per Month — FHA might be your lane.

I break down credit start to finish on the podcast in Episode 15: listen here.

Score tiers (580 FHA 3.5% down; 620; 640 CalHFA FHA / GSFA; 680 conventional) are from the FTHB Pros credit checklist spec, the FHA loan post, and the original episode post, verified November 8, 2026. Conventional benchmark rate 7.18% is the Freddie Mac Primary Mortgage Market Survey, week ending November 5, 2026. Your actual score and rate depend on your full credit file and your lender. This is education, not a rate quote or a loan approval. Dat Nguyen, NMLS 1379110.