(a) A tax imposed under this subchapter or a change in the tax rate takes effect on the date prescribed by the ordinance or order imposing the tax or changing the rate.
(b) A municipality or county may impose a tax under this subchapter only if the municipality or county issues bonds or other obligations under § 334.043 before the first anniversary of the date the tax is imposed. The municipality or county may impose the tax only while those bonds or other obligations are outstanding and unpaid.