The library reviews the text of all bills that become law to determine their effective dates and enters the information into Texas Legislature Online (TLO). To find the effective date of a bill, look up the bill in TLO and check the "Last action" field in the history window. In some cases, different sections of a bill may have different effective dates, in which case additional remarks will be given to provide the information.


For House and Senate bills from the 86th Regular Session (2019), the two largest groupings are:

  • Effective immediately: 473
  • Effective on 9/1/19: 820

The library compiles a more detailed list of bills and their effective dates following each regular and called session. The list is made available on the library's website once it is complete.