I sit across the desk from first time buyers every week, and the mistakes that hurt are almost never the ones they worried about. This post pairs with our Arizona first time home buyer guide, which covers the full process. Here I am focused on the specific moves that cost Arizona buyers money, with a fix for each one.

Every number below comes from a named source I checked on October 31, 2026.

Mistake 1: Waiting until you have 20% down

You do not need 20% down to buy your first home in Arizona. HUD says an FHA down payment can be as low as 3.5%. Fannie Mae's HomeReady allows 3% down, with income limits, and Freddie Mac's Home Possible works the same way. VA says its purchase loan works especially well if you do not want to make a down payment, and USDA's guaranteed program offers 100% financing in eligible rural areas.

Put real numbers on it. Redfin's September 2026 Phoenix median sale price was $452,285. Twenty percent of that is $90,457. Three and a half percent is about $15,830, and 3% is about $13,569. For most people, the gap between those numbers is years of saving.

The honest caveat: less down means a bigger loan and mortgage insurance. On a conventional loan, though, the CFPB explains that you can ask to cancel PMI when your balance is scheduled to reach 80% of the home's original value, and it generally ends automatically at 78%. Our post on what PMI costs in Arizona shows how that plays out.

Mistake 2: Getting a quote from only one lender

Get at least two or three Loan Estimates before you commit. A lot of buyers worry that shopping will hurt their credit. It will not. The CFPB says that within a 45 day window, multiple credit checks from mortgage lenders are recorded as a single inquiry.

The CFPB also says a lender must give you a Loan Estimate within three business days of receiving your application. That form shows the rate, the monthly payment and the total closing costs in the same layout from every lender, so you can line them up side by side. Compare the rate, the points and the lender fees together, not one number at a time.

This is where a broker earns the call. We price your file across the wholesale lenders we work with instead of offering you one bank's menu.

Mistake 3: Stopping at prequalified

A prequalification based on what you told someone over the phone is not the same as a preapproval where your credit, income and assets were actually reviewed. Sellers and their agents know the difference, and so does the underwriter who finds the problem three weeks into escrow.

Get the real thing before you tour. Our guide on how to get preapproved for a mortgage in Arizona lists what to gather, and our mortgage preapproval page is where you can start one with us.

Mistake 4: Taking down payment assistance without comparing payments

Do not take assistance until you have seen the payment with and without it. Assistance is marketed as free money, and the down payment part can feel that way at the closing table. The cost shows up later, in the rate and the monthly payment.

If you still want to look, here are the Arizona facts. HOME Plus from the Arizona Industrial Development Authority offers up to 4% toward down payment and closing costs. The forgivable version is a 0% deferred second lien forgiven after 60 months, but it must be repaid in full if you sell or refinance before then. The income limit is $155,386 as of April 6, 2026. Arizona Is Home ran out of 2026 funds and was retired for the rest of the year as of October 6, 2026. Our full breakdown is on the Arizona down payment assistance page.

Mistake 5: Budgeting principal and interest only

Your real payment is principal, interest, property tax, homeowners insurance, mortgage insurance and HOA dues. Online calculators that show only principal and interest set you up for a surprise.

At Freddie Mac's October 29, 2026 average of 7.24% on a 30 year fixed, principal and interest alone on a $436,455 loan, which is the Phoenix median with 3.5% down, is about $2,974 a month. Taxes, insurance, mortgage insurance and any HOA dues come on top of that. Your own rate depends on your credit, loan type and down payment, so treat the survey average as a starting point, not a quote.

A related mistake is shopping right at your maximum approval. An approval tells you what a lender will allow. It does not know about your car repairs, your daycare bill or the summer electric bill on a two story stucco house. Pick a target payment you are comfortable with and shop below the ceiling.

Run your own numbers

Mistake 6: Forgetting the cash you need beyond the down payment

The down payment is not the whole check. You also need closing costs, prepaid items like your first year of homeowners insurance and the escrow cushion for taxes and insurance, plus the earnest money you put up when your offer is accepted. Your Loan Estimate lists the estimated cash to close, which is why getting one early matters.

The fix is to ask the seller for help. A seller credit toward closing costs is usually a better deal than a second lien, and in a slower market sellers are often willing. Our cash to close guide for first time buyers walks through every line, and a conventional loan or FHA loan both allow seller credits within limits.

Once you know your number, you can start looking at what is actually listed on Arizona Luxury Property Search.

Mistake 7: Letting escrow slip through small decisions

The last mistakes happen after your offer is accepted, and they are the easiest to avoid.

Treating the inspection period as a formality. In Arizona, the inspection period is when you find problems and ask the seller to fix or credit them. Skipping or rushing it gives up your leverage. Our post on the Arizona inspection period and BINSR explains the steps.

Changing your credit or job before closing. A new car loan, a store card for furniture or a job switch can stall an approval. Keep everything boring until you have keys. The full list is in what not to do before closing.

Not reading the Closing Disclosure. The CFPB says your lender must give it to you at least three business days before closing. Compare it line by line to your Loan Estimate and ask about anything that changed.

First time buyer mistakes cheat sheet

Here is the short version to keep handy while you shop.

Phoenix median from Redfin, September 2026. Credit window, Loan Estimate and Closing Disclosure timing from the CFPB. All checked October 31, 2026.

If you are shopping in the West Valley, our Goodyear first time buyer guide puts these numbers to work in one city. For the whole roadmap, go back to the first time home buyer Arizona guide, or read more about how I work on Blake Hermann's page.

Sources

All sources checked October 31, 2026. Program rules and funding change, so confirm before you rely on them.

1. HUD, FHA loans (down payment as low as 3.5%), checked October 31, 2026
2. Fannie Mae, HomeReady Mortgage (down payments as low as 3%); Freddie Mac, Home Possible, checked October 31, 2026
3. VA, Purchase loan, checked October 31, 2026
4. USDA Rural Development, Single Family Housing Guaranteed Loan Program, checked October 31, 2026
5. Redfin, Phoenix, AZ housing market page, data through September 2026, checked October 31, 2026
6. Freddie Mac, Primary Mortgage Market Survey, October 29, 2026, checked October 31, 2026
7. CFPB, What happens when a mortgage lender checks my credit?, checked October 31, 2026
8. CFPB, What is a Loan Estimate?, checked October 31, 2026
9. CFPB, When can I remove PMI?, checked October 31, 2026
10. CFPB, What is a Closing Disclosure?, checked October 31, 2026
11. Arizona IDA, HOME Plus program page (income limit as of April 6, 2026) and Arizona Is Home update effective October 6, 2026 (homeplusaz.com), checked October 31, 2026

Pillar Mortgage Group, LLC. NMLS #2700076. Arizona License MB-2009671. Blake Hermann, NMLS #2271358. Equal Housing Lender. This article is education, not a loan offer or a commitment to lend. All loans are subject to credit approval, and rates, limits and programs change without notice.

Frequently asked questions