Florida TRIM Notices Explained: What That August Letter Means and What to Do About It
Every August, Florida property appraisers mail millions of TRIM notices — "Truth in Millage" — and every August, most of them get skimmed and filed away. That's a mistake, because the TRIM notice is not junk mail. It's the only official preview of your November tax bill, and it contains a deadline that expires about 25 days after it's mailed.
What's actually on the TRIM notice
Three things matter:
1. Your market value and assessed value. The property appraiser's estimate of what your home was worth on January 1 of this year, and the (often lower) assessed value after caps like Save Our Homes are applied. If you're homesteaded, Save Our Homes limits annual assessed-value increases to 3% or the CPI, whichever is lower — which is why your assessed value can keep climbing even in a flat market.
2. Your exemptions. Homestead, senior, veteran, and other exemptions that reduce your taxable value. If you're eligible for the homestead exemption and it's not on the notice, addressing that is often worth more than any appeal.
3. The proposed tax rates and hearing dates from each taxing authority — plus, in the fine print, your right to challenge the value and the deadline for doing so.
The deadline nobody notices
If you believe the market value on your TRIM notice is higher than your home was actually worth on January 1, you can file a petition with your county's Value Adjustment Board (VAB). The deadline is the one that catches people: 25 days after the property appraiser mails the TRIM notices — typically landing in mid-September. Each county sets the exact date, and it's printed on the notice itself.
Miss it, and the value stands for the year. Your November bill arrives, computed on the number you didn't challenge.
(There's also a free informal step: call your county property appraiser's office and ask them to review the value. Sometimes obvious errors — wrong square footage, a pool you don't have — get corrected without a petition. But don't let an informal review run out the clock on the VAB deadline.)
How to know if your value is actually too high
The market value on your notice is supposed to reflect what your home would have sold for on January 1 — generally derived from mass-appraisal models, not an individual look at your home. The test is simple in principle: what did genuinely comparable homes near you sell for in the months around that date?
If similar homes sold for meaningfully less than your noticed market value — 5% or more — a VAB petition backed by those sales has a real foundation. Filing costs about $15 in most counties, and hearings before a special magistrate are informal.
If comparable sales support your value, the honest answer is that a petition will likely fail, and your energy is better spent confirming your exemptions are in place.
You can get that answer in about two minutes: enter your address in the checker on this page and it pulls your assessment, compares it against recent comparable sales, and shows your county's verified deadline — sources cited, free, no account. We track Florida county deadlines (Miami-Dade, Broward, Palm Beach, Hillsborough, Pinellas, Orange, Duval, and more) in our deadline table, with step-by-step county guides at grovehopper.com/guides.
The Florida-specific traps
- "My taxes can't go up much — I'm homesteaded." Save Our Homes caps your assessed value increase, not your market value. If you plan to sell, portability of your Save Our Homes benefit depends on those numbers being right.
- New buyers get reset. If you bought recently, the cap reset at sale — your first TRIM notice as an owner often shows a startling jump from what the seller was paying. Your number is worth checking closely; assessments after a reset frequently overshoot.
- Non-homesteaded property (rentals, second homes) is capped at 10% — much looser, so big jumps are common and worth verifying.
The letter arrives in August. The deadline is in September. The bill comes in November. The order of those three dates is the whole reason to open the envelope.