File a final tax return in your previous state of residence and submit your Federal Form 1040 to the Internal Revenue Service with your new Florida address. File a Declaration of Domicile with the Clerk of Court in the Florida County in which you reside.Complete an Out-of-. State Purchase Return (Form DR-15MO) to file and pay use tax. Spending 183 days in the state can help establish residency but is not the only step that needs to be taken. Every person has a domicile. This rarely-considered fact has far-reaching consequences, including where and how an individual is taxed. According to Florida Statutes §222.17, the Affidavit of Domicile must be filed with the clerk of the circuit court in the area where you intend to reside.