Adjustable-Rate Mortgages and Down Payment Assistance in Florida — What Tampa Bay Buyers Need to Know

Adjustable-rate mortgages are having a moment in 2026. With 30-year fixed rates still elevated, many Tampa Bay buyers are eyeing 5/1 and 7/1 ARMs that open 0.75 to 1.25 percentage points lower — a meaningful monthly savings on a $350,000 purchase. At the same time, Florida's down payment assistance programs remain one of the most powerful tools available for buyers who need help with upfront costs.

The natural question: can you combine the two? Can you take an ARM first mortgage and layer Florida DPA on top of it?

The answer depends heavily on which DPA program you're pursuing — and the distinction matters before you ever call a lender.

How Do Adjustable-Rate Mortgages Work for Florida Buyers?

An ARM is a mortgage with an interest rate that stays fixed for an initial period — commonly 5, 7, or 10 years — and then adjusts annually based on a benchmark index (typically the Secured Overnight Financing Rate, or SOFR) plus a margin set by the lender.

A 5/1 ARM in Florida in mid-2026 might open around 5.75–6.25%, compared to a 30-year fixed at 6.75–7.25%. On a $330,000 loan, that initial rate difference saves roughly $115–$155 per month. Over a 5-year fixed period, that's $6,900–$9,300 in cumulative savings — before any adjustment.

After the fixed period ends, the rate can adjust up or down each year, subject to caps. A typical conventional ARM carries a 2% annual cap (the rate can't move more than 2 percentage points in a single year) and a 5–6% lifetime cap over the starting rate.

ARMs work best when a buyer plans to sell or refinance before the first adjustment, when rates are expected to decline, or when a buyer's income is projected to rise substantially during the fixed period.

Which Florida DPA Programs Require a Fixed-Rate First Mortgage?

This is the critical piece most buyers miss. Florida Housing Finance Corporation's flagship DPA programs — Hometown Heroes, FL Assist, HFA Preferred PLUS, and the Florida Homeownership Loan Program (FL HLP) — are all layered on top of Florida Housing's own first mortgage products. Those first mortgages are 30-year fixed-rate loans.

That means if you want Florida Housing's DPA, you take a Florida Housing fixed-rate first mortgage. You cannot substitute an ARM from another lender and still access Hometown Heroes or FL Assist through the state program.

This is not a bug — it's intentional. The state programs are designed to pair with predictable, stable monthly payments. An ARM's variability would complicate the program's long-term affordability goals and the DPA repayment structure tied to the property.

For buyers who have their hearts set on an ARM first mortgage, the state-level programs are effectively off the table in their standard form. But that doesn't mean all DPA options are closed.

What DPA Options Can Be Combined with an ARM First Mortgage?

Several DPA sources can work alongside an ARM first mortgage from a conventional or FHA lender:

• SHIP (State Housing Initiatives Partnership) programs: County-administered SHIP funds are distributed independently of Florida Housing's first mortgage products. Hillsborough, Pinellas, and Pasco counties each administer their own SHIP funds, and some allow the buyer to bring any qualifying first mortgage — including a conventional ARM. Requirements and availability vary by county, so confirm with your county housing office or an approved lender that handles SHIP.
• City-level programs: Tampa's DARE program (up to $50,000 for eligible buyers) and similar municipal programs often have more flexibility about first mortgage type. These programs focus on income eligibility and property location rather than dictating your lender's rate structure.
• Employer-assisted housing (EAH): Some Tampa Bay employers — particularly large healthcare systems and government entities — offer down payment grants or matching programs that impose no restrictions on the underlying first mortgage product. An ARM paired with employer-provided DPA is a legitimate and increasingly used combination.
• National DPA programs: Programs like Chenoa Fund and certain bank grant programs (Wells Fargo's LIFT, Chase's Homebuyer Grant) may be compatible with ARM first mortgages depending on the specific product and lender. The rules change, so always verify current guidelines with the specific DPA provider.
• FHA ARMs with FHA-compatible DPA: FHA does allow adjustable-rate mortgages (5/1 FHA ARM is the most common). Some DPA programs that accept FHA first mortgages will work with the ARM version. This is less common but worth asking about if FHA is your financing path.

Is It Better to Take an ARM Without DPA or a Fixed Rate With DPA?

This is the real decision many Tampa Bay buyers face, and the math isn't always obvious.

Consider a buyer purchasing a $340,000 home who qualifies for $10,000 in FL Assist (a deferred second mortgage at 0%) on a 30-year fixed at 7.0%. Alternatively, they could take a 5/1 ARM at 6.0% without any DPA.

• Fixed + DPA scenario: $330,000 first mortgage (after $10,000 DPA applied to down payment) at 7.0% = ~$2,196/month principal and interest. Buyer brings $10,000 less cash to closing.
• ARM without DPA scenario: $340,000 first mortgage at 6.0% = ~$2,039/month for years 1–5. Buyer brings $10,000 more cash to closing.

The ARM saves $157/month initially — about $9,420 over five years. But the buyer also needed $10,000 more upfront. The net advantage of the ARM strategy over five years is roughly $580 — before factoring in what happens when the rate adjusts.

If the ARM rate rises by 2% after year five (a plausible scenario, not a worst case), the monthly payment jumps to ~$2,310 — higher than the fixed-rate DPA scenario. The buyer who took the fixed-rate DPA path now has the lower payment.

For buyers who are certain they'll sell or refinance before year five, the ARM may come out slightly ahead. For buyers planning to stay long-term, the fixed-rate DPA path often wins on total cost — and carries substantially less risk.

What Happens If You Want to Refinance an ARM When You Have DPA?

Refinancing with an outstanding DPA second mortgage is possible, but you need to understand the terms of your specific program before doing it. Refinancing after DPA is covered in detail in a separate guide, but the core issue is this: many DPA programs — including FL Assist and Hometown Heroes — require the full DPA balance to be repaid when you refinance, even if the loan is otherwise deferred until sale.

This creates a specific risk for ARM borrowers: if your ARM adjusts upward and you want to refinance into a lower fixed rate, you may owe the DPA balance at that closing. Depending on your equity position and the DPA amount, this could significantly increase your refinancing costs or require cash you don't have.

Buyers considering an ARM should game out this scenario with their lender and ask specifically: "If I refinance in year five or six, what DPA amount would be due at that closing?"

How Do You Decide Which Path Is Right for You?

The right choice between an ARM with alternative DPA, an ARM without DPA, or a fixed rate with state DPA depends on four factors: how long you plan to own the home, how much cash you have for upfront costs, your income trajectory, and your risk tolerance for rate variability.

As a starting point:

• If you plan to stay in the home more than seven years, the fixed-rate DPA programs typically offer better long-term cost protection.
• If you're confident you'll sell or refinance within five to seven years and you have enough cash for a full down payment, a 5/1 or 7/1 ARM can lower your payment during the period you own the home.
• If you need DPA to make the purchase work at all — and most first-time Tampa Bay buyers do — the fixed-rate Florida Housing programs are the most reliable and highest-value option available.

Barrett Henry, REALTOR® with REMAX Collective, works with buyers across Tampa Bay to analyze these trade-offs with real numbers before they commit to a loan structure. With more than 23 years of real estate experience, Barrett can refer you to approved DPA lenders and walk through the ARM vs. fixed comparison for your specific purchase price and financial picture. Call or text (813) 733-7907 to get started.

For additional first-time buyer resources and program guides, visit firsttimehomebuyertb.com. If you want to explore what homes are available in your target communities before choosing a loan structure, nowtb.com offers full Tampa Bay MLS search with neighborhood guides.