The 5 percent rule does not apply to every public job. Subsection (6) of the same section, in section 255.078, says the section "does not apply to any construction services purchased by a public entity if the total cost of the construction services purchased as identified in the contract is $200,000 or less."
Read that as a threshold test, and be exact about it. The line is $200,000, and the test is "or less." A contract at exactly $200,000 falls outside the section. A contract one dollar higher falls inside it. A small firm that is close to the line should not guess.
Two details deserve attention. First, the test looks at the total cost of the construction services "as identified in the contract." The number to check is the one stated in the public contract for the services purchased. It is not the dollar value of your own subcontract, and it is not the size of one invoice. Your subcontract may be well under $200,000 while the prime contract is well over it, or the reverse. Pull the contract and read the number yourself.
Second, check how change orders, add-alternates, or later amendments affect the total. If you are near the line, ask the owner's representative that question in writing and get an answer before you rely on either side of the threshold. A written answer is much easier to defend later than a memory of a phone call.
Here is what the threshold does to your payment work. Because the subsection says the whole section does not apply to a contract at or under $200,000, the 5 percent ceiling and the duty to pass along retainage that appear in that section do not apply under its own terms either. Suppose the public contract total sits just under $200,000. Under this section, the 5 percent test is not the test you run, whatever the owner withholds. That does not make your obligations to your subcontractors disappear. Your subcontract still governs what you owe and when. It means you should not assume the statute protects or constrains you the way it would on a larger job. Find out which rules, if any, do apply below the line before you set your payment schedule.
If the total cost of construction services identified in the public entity's contract is above $200,000, the section applies, and the 5 percent ceiling and the duty to pass along retainage both apply to your job. Treat them as the baseline. Ask the owner for a written retainage schedule, if one exists, that shows how much is held on each pay application and when it will be released, and keep that schedule with the contract. When the numbers in your pay application and the owner's statement do not match, you have a documented question instead of a guess.