Most buyers in California start their home search by looking at list prices. The number that decides whether a home actually works, though, is the monthly payment, and on a conventional mortgage that payment is shaped by three levers you have some control over: how much you put down, how strong your credit is, and whether you carry private mortgage insurance. Understanding how those three pieces interact can save you thousands of dollars over the first few years of ownership.

This guide walks through each lever in plain terms, using the kind of trade-offs Los Angeles, Burbank and Glendale buyers run into every week.

What Makes a Loan "Conventional"

A conventional mortgage is any home loan that is not insured or guaranteed by a government agency such as the FHA, VA or USDA. Most conventional loans follow the guidelines set by Fannie Mae and Freddie Mac, which is why lenders can sell them on the secondary market and offer competitive pricing. As long as the loan amount stays at or under the conforming limit for your county, which the Federal Housing Finance Agency updates each year, the loan is considered conforming. Above that limit, you move into jumbo territory with different rules.

Because there is no government insurance behind a conventional loan, the lender prices risk directly. That is exactly why down payment and credit matter so much more here than many first-time buyers expect. If you want to see how these rules apply to your own numbers, a broker who specializes in the conventional loan in California market can run side by side scenarios before you write an offer.

Lever One: Your Down Payment

A common myth is that you need 20 percent down to buy with a conventional loan. You do not. Qualified first-time buyers can put as little as 3 percent down through programs such as Fannie Mae HomeReady and Freddie Mac Home Possible, and many repeat buyers can go as low as 5 percent.

The real question is not the minimum, it is the trade-off. A smaller down payment keeps more cash in your savings for moving costs, repairs and reserves. A larger one lowers the loan balance, can improve your rate pricing, and reduces or removes mortgage insurance. In a high-cost market like Los Angeles County, the gap between 5 percent and 20 percent down on a typical single-family home can be well over one hundred thousand dollars, so most buyers land somewhere in the middle.

Gift Funds and Down Payment Help

Conventional guidelines allow down payment gifts from family members, provided the gift is documented with a signed gift letter and a clear paper trail. Some state and local assistance programs can also be layered on top of a conventional first mortgage. These rules change often, so confirm what is currently available before you count on it.

Lever Two: Your Credit Score

Most conventional loans require a minimum credit score of 620, but the minimum is rarely where the best pricing lives. Lenders apply loan level price adjustments based on a combination of your credit score and your loan to value ratio. In practical terms, a buyer with a 760 score and 10 percent down will usually see a noticeably better rate than a buyer with a 680 score and the same down payment.

The good news is that credit is often the easiest lever to move before you apply. A few steps that tend to make a real difference within 60 to 90 days:

  • Pay revolving card balances below 30 percent of each limit, and ideally below 10 percent before your report date.
  • Avoid opening new accounts or financing furniture and cars during the loan process.
  • Pull all three reports and dispute any errors, such as accounts that are not yours or late payments that were reported incorrectly.
  • Keep older accounts open, since closing them can shorten your credit history and raise your utilization.

Lever Three: Private Mortgage Insurance

If you put less than 20 percent down on a conventional loan, the lender will usually require private mortgage insurance, often called PMI. PMI protects the lender, not you, but it is what allows you to buy with a smaller down payment in the first place.

The monthly PMI cost depends on your credit score, down payment and loan amount. Two buyers with the same purchase price can see very different PMI premiums simply because one has stronger credit. This is another reason the credit work above pays off twice.

PMI Is Not Permanent

Unlike the mortgage insurance on most FHA loans, PMI on a conventional loan can come off. Under the federal Homeowners Protection Act, you can ask your servicer to cancel PMI once your balance reaches 80 percent of the original home value, provided you have a good payment history, and it ends automatically when the balance reaches 78 percent. If your home appreciates, some servicers will also consider a new appraisal to remove PMI sooner. That flexibility is a big part of why many buyers who qualify for both programs end up choosing conventional over FHA.

Putting the Three Levers Together

Here is how the levers usually play out for real buyers. Someone with excellent credit and 10 percent down may find that the combined cost of their rate and PMI is close to what they would pay with 20 percent down, while keeping a large cash cushion. Someone with fair credit may find that waiting two or three months to improve their score lowers both the rate and the PMI enough to justify the delay.

There is no single right answer. The best structure depends on your savings, your timeline and how long you plan to stay in the home. For buyers purchasing their very first property, it is worth comparing a conventional loan against other first time home buyer loan options before deciding, because the cheapest option on paper is not always the cheapest over five years.

Questions to Ask Before You Choose

  • What is my estimated payment at 5, 10 and 20 percent down, including PMI, taxes and insurance?
  • How much would a 20 or 40 point credit score improvement change my rate and PMI?
  • Is my target price within the conforming limit for my county, or am I close to the jumbo line?
  • How soon could PMI realistically come off based on my payment plan?
  • How many months of reserves will I have left after closing?

The Bottom Line

A conventional loan is one of the most flexible ways to buy a home in California, but its cost is not fixed. Your down payment, your credit and the way you handle PMI all move your monthly payment in ways that compound over time. Take the time to model a few scenarios with a licensed professional, get your credit in shape early, and choose the structure that leaves you comfortable, not just approved.

Anna Kara Inc., branch of Equity Smart Home Loans Inc. NMLS #1241473 | DRE #01924739. Equity Smart NMLS# 856170 | DRE# 01906808. This article is for general information only and is not a commitment to lend. Loan programs and guidelines are subject to change.