Do Florida sellers have to pay the buyer's agent?

No. Nothing in Florida law requires a seller to pay the buyer's agent. Whether you do is a business decision.
Why most sellers still offer something
Most buyers now sign a buyer agreement before touring, which obligates them to pay their agent if the seller does not. Many buyers cannot add $10,000 or more to their cash at closing, so they ask the seller to cover it in the offer.
What happens if you refuse
Some buyers will still offer. Others will skip your home or offer less to make up the difference. In a slow market with plenty of listings, refusing usually costs more than it saves.
A middle ground
Many sellers say they will consider a concession in offers without committing to a number. Your listing agent can show you what nearby comparable homes offered and how fast they sold.
Saving on your own side
Separately from the buyer's agent, you can cut what you pay your own listing agent. Our Florida partners reduce the listing-side commission by 25%, written into the listing agreement.