Amend CSHB 3646 by adding the following SECTION to the bill, 
appropriately numbered, and renumbering the subsequent SECTIONS of 
the bill accordingly:
	SECTION ____.  (a)  Section 26.08, Tax Code, is amended by 
adding Subsection (p) to read as follows:
	(p)  Notwithstanding Subsections (i), (n), and (o), if for 
the preceding tax year a school district adopted a maintenance and 
operations tax rate that was less than the district's effective 
maintenance and operations tax rate for that preceding tax year, 
the rollback tax rate of the district for the current tax year is 
calculated as if the district adopted a maintenance and operations 
tax rate for the preceding tax year that was equal to the district's 
effective maintenance and operations tax rate for that preceding 
tax year.
	(b)  Subsection (a), Section 45.001, Education Code, is 
amended to read as follows:
	(a)  The governing board of an independent school district, 
including the city council or commission that has jurisdiction over 
a municipally controlled independent school district, the 
governing board of a rural high school district, and the 
commissioners court of a county, on behalf of each common school 
district under its jurisdiction, may:
		(1)  issue bonds for:                                                         
			(A)  the construction, acquisition, and equipment 
of school buildings in the district;
			(B)  the acquisition of property or the 
refinancing of property financed under a contract entered under 
Subchapter A, Chapter 271, Local Government Code, regardless of 
whether payment obligations under the contract are due in the 
current year or a future year;
			(C)  the purchase of the necessary sites for 
school buildings; and         
			(D)  the purchase of new school buses; and                                   
		(2)  may levy, pledge, assess, and collect annual ad 
valorem taxes sufficient to pay the principal of and interest on the 
bonds as or before the principal and interest become due, subject to 
Section 45.003.
	(c)  The change in law made by this section applies to the ad 
valorem tax rate of a school district beginning with the 2009 tax 
year, except as provided by Subsection (d) of this section.
	(d)  If the governing body of a school district adopted an ad 
valorem tax rate for the school district for the 2009 tax year 
before the effective date of this section, the change in law made by 
this section applies to the ad valorem tax rate of that school 
district beginning with the 2010 tax year, and the law in effect 
when the tax rate was adopted applies to the 2009 tax year with 
respect to that school district.
	(e)  This section takes effect immediately if this Act 
receives a vote of two-thirds of all the members elected to each 
house, as provided by Section 39, Article III, Texas Constitution.  
If this Act does not receive the vote necessary for immediate 
effect, this section takes effect September 1, 2009.