Not necessarily. However, if the contract is for your payment of another person’s debt[1], if it concerns real estate[2], if it lasts more than one year[3], or if it transfers property after death (i.e. a will)[4], it must be in a signed writing.

[1] §§ 725.01 and 687.0304, Fla. Stat.

[2] § 689.01, Fla. Stat.

[3] Chapters 670-680, Fla. Stat.

[4]§ 732.502, Fla. Stat.