Why Your Property Tax Jumps in Year Two of a New Build

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Your first-year tax bill on a new construction home is based on what existed on the property on January 1 — often vacant or partially built land, not the finished house. The following January 1, the county assesses the completed home at full market value, and that bill can run three to five times higher. A second, separate jump often follows when your mortgage servicer catches up on escrow.

Almost nobody explains this before closing. Builders don't bring it up because it makes the deal look worse than it is. Lenders quote a payment based on the wrong number. Here's exactly what's happening and what to do about it.

Florida law requires county property appraisers to assess real property based on its status as of January 1 each year (Florida Statute § 192.042). It doesn't matter when you closed, when construction finished, or what you paid. What matters is what existed on the parcel on that one date.

If you closed on a home that wasn't complete by January 1 — a spec home still under construction, or a to-be-built home you contracted for mid-year — that year's tax bill was calculated on the land, possibly with partial improvements, not the finished house.

By the following January 1, the home is done, and the property appraiser assesses it at full market value for the first time. That new assessed value shows up on your TRIM (Truth in Millage) notice, mailed by the county appraiser in August, and drives the tax bill due that November — the first bill that reflects what you actually bought.

This isn't a St. Johns County quirk. It's how every county in Florida works. It just hits new construction buyers harder because the gap between "vacant lot" and "finished $500,000 house" is enormous, where a resale buyer's gap between last year's and this year's assessment is usually small.

Here's an illustrative example — not a specific property's actual bill, since the real number depends on your community's total millage rate, which includes the county, the school district, and in some communities a CDD debt assessment.

Say you close on a new home in St. Johns County in September, and the home wasn't finished on the January 1 before your closing. Your Year 1 tax bill reflects the parcel's status before the home was built — land value only, for example roughly $100,000–130,000 of assessed value. Your Year 2 tax bill reflects the completed home, assessed the following January 1 at full market value — for example, roughly $450,000–550,000.

The county-level millage components confirmed for St. Johns County's most recent adopted budget are the General Fund at 4.6537 mills, the County Transportation Trust Fund at 0.8444 mills, the County Health Unit Trust Fund at 0.0160 mills, and the countywide Fire District at 1.3813 mills — a combined 6.8954 mills from the county alone, before the school district, water management district, and any CDD debt assessment are added. Those additional layers typically bring the total combined rate for an unincorporated St. Johns County property well above the county-only figure.

Before you rely on a specific dollar number for a specific address, pull the current combined millage rate from the St. Johns County Property Appraiser's office or your TRIM notice — it varies by taxing district, and the county's General Fund rate was already proposed to drop slightly to 4.5650 mills for the coming fiscal year, so it changes year to year.

The takeaway isn't the exact multiplier. It's that the jump from Year 1 to Year 2 is structural, not a mistake, and it's large enough that you should plan for it rather than be surprised by it.

This is the part that actually catches people off guard, because it doesn't happen at the same time as the tax bill.

Most lenders set your initial escrow payment using the seller's prior tax bill — which, for new construction, usually means the low, land-only number, because that's the only number that existed when your loan was underwritten. Your quoted monthly payment at closing reflects that low figure.

About a year to fourteen months later, your servicer runs its annual escrow analysis, sees the real Year 2 tax bill come through, and discovers your escrow account is short. Two things typically happen: your monthly payment increases going forward to cover the higher taxes, and you're often asked to pay a lump sum to cover the shortfall that already accrued. Buyers frequently experience this as their mortgage payment "randomly" going up in year two or three of ownership, disconnected in their mind from the tax bill that caused it.

Ask your lender to escrow based on the estimated finished-value tax bill, not the seller's current bill, if your loan program allows it. Not all do, but it's worth asking before you close.

Set aside the estimated difference yourself in the first year, so the escrow catch-up doesn't hit as a cash-flow surprise.

File for homestead exemption by March 1 of the year after you move in, with the St. Johns County Property Appraiser. Homestead reduces your taxable value by up to $50,000 and, from the following year forward, caps future assessment increases at 3% per year or the rate of inflation, whichever is lower — but it does not prevent the initial jump to full assessed value, since that first full assessment happens before the cap engages.

Know that a CDD assessment is separate from all of this. If your community has a Community Development District, that fee is fixed by the CDD's own bond schedule and O&M budget — it isn't affected by homestead exemption or the Save Our Homes cap, and it shows up on the same tax bill but is calculated independently.

The year-two jump isn't a red flag about the property or the builder — it's how Florida's assessment calendar interacts with new construction timing. What matters is going in with the real number, not the artificially low one your lender quoted at closing. If you're evaluating a new construction contract in St. Johns County or Jacksonville and want the actual current millage rate and CDD math for a specific community before you sign, that's exactly the kind of document review I do for my buyer clients.

Matthew Sodel — Real Estate Advisor & Certified New Home Specialist, Highlight Realty, FL License SL3216518, Broker John Sanchez. Independent buyer representation for new construction in Jacksonville and St. Johns County. Call or text 561-504-4798.

This guide explains general Florida property tax mechanics and is not tax or legal advice. Confirm current millage rates and assessed values for any specific property with the St. Johns County Property Appraiser before making a purchase decision. Last verified August 20, 2026.