
Quoting
distressedmom
Florida can order retroactive support, but only 2 years from the date of filing. It is not an automatic thing, the petitioner must request it.
If you've kept good records of your payments then you should receive credit towards that retroactive support.
The fact that you haven't seen your child in 2 years will come into play when calculating support. If a child spends more than 40 percent of the time with one parent then parent that spends more time with the child gets a bit more support. You could make an arguement that you had seen the child until 2 years ago.