Conventional Loan Credit Score Tiers in Texas: What Each One Actually Costs You

620 is the minimum credit score for a conventional loan in Texas — but it is not what most of my DFW clients actually pay to get there. Conventional pricing is built in four credit score tiers, and which one you land in changes both your interest rate and your monthly PMI cost, sometimes by $150-200 a month on an otherwise identical loan. I'm Bond Peter Njoku (NMLS #2670329), and this is the exact breakdown I walk clients through before they lock a rate.

What are the conventional loan credit score tiers in Texas?

Fannie Mae and Freddie Mac price conventional loans on a grid, and that grid breaks credit scores into bands. Here's how those bands play out on a $350,000 DFW home with 5% down:

Illustrative ranges only — your actual pricing depends on the specific investor grid, loan-to-value, and coverage requirement at the time you lock. See the full conventional loan requirements in Texas for the complete qualification picture, or run your own numbers in my Texas mortgage calculator.

Why does credit score affect PMI, not just my interest rate?

This is the part most buyers don't expect. On an FHA loan, mortgage insurance is a flat percentage regardless of your score. On a conventional loan, PMI is risk-based — a lower score means the mortgage insurer is taking on more perceived risk, so they charge more for it, on top of a higher base interest rate. That's a double cost stacked on the same tier line, which is why crossing from 679 to 680 can matter more than it looks like on paper.

How much does the difference between 620 and 740 actually cost per month?

On that same $350,000 home with 5% down ($332,500 loan amount), the gap between the bottom tier and the top tier is roughly $150-190 a month in combined rate and PMI cost — call it $1,800 to $2,300 a year, for the life of the loan until PMI drops off. Run over even five years, that's real money, which is why I always ask where a client's score sits relative to the nearest tier line before we talk about locking.

Is it worth delaying my purchase to raise my credit score?

Sometimes — but only if you're close to a tier line, not just anywhere in a tier. Moving from 655 to 670 does very little; you're still in the 620-679 band. Moving from 675 to 685 crosses into the next tier and changes your pricing. I ask every client for their current score and the specific factors dragging it down — utilization, a thin file, a single late payment reporting — before recommending whether to wait 60-90 days or move forward now.

Named example: a Mesquite buyer who crossed a tier line

Last year I worked with a buyer in Mesquite sitting at a 674 score, five points under the 680 tier line, looking at a $290,000 purchase with 5% down. Rather than lock immediately, we spent about six weeks paying down two credit card balances below 30% utilization. His score moved to 686 — enough to cross into the 680-719 tier — and it dropped his combined rate-and-PMI cost by roughly $95 a month. On a 30-year loan, that's over $34,000 saved across the life of the mortgage for six weeks of waiting.