4.0.0 release

docs/about/releases.md

@@ -3,6 +3,20 @@ Release history
 Go [here](https://github.com/PSLmodels/Tax-Calculator/pulls?q=is%3Apr+is%3Aclosed)
 for a complete commit history.
 
+2024-06-01 Release 4.0.0
+------------------------
+(last merged pull request is
+[#2749](https://github.com/PSLmodels/Tax-Calculator/pull/2749))
+
+**This is a major release with changes that make Tax-Calculator incompatible with earlier releases.**
+
+**API Changes**
+- Reframewrok of the payroll tax policy parameters: Payroll tax parameters are split into the employer side and employee side ~ `FICA_mc_trt`, `FICA_ss_trt` are replaced by `FICA_mc_trt_employer`, `FICA_mc_trt_employee`, `FICA_ss_trt_employer` and `FICA_ss_trt_employee`. [[#2669](https://github.com/PSLmodels/Tax-Calculator/pull/2669) by Bodi Yang]
+- CDCC rate scale (`CDCC_crt`, `CDCC_frt`) changed from 0~1 to 0~100. [[#2628](https://github.com/PSLmodels/Tax-Calculator/pull/2628) by Duncan Hobbs and [#2671](https://github.com/PSLmodels/Tax-Calculator/pull/2671) by Jason DeBacker]
+
+**New Features**
+- Tax-Calculator 4.0.0 starts to incorporate with new [Taxcalc-Payroll](https://github.com/bodiyang/Taxcalc-Payroll) model, micro-simulation model focusing on payroll tax analysis. New features include (1) payroll tax reform simulation upon either employer side or employee side; (2) employer side payroll tax offset. [[Taxcalc-Payroll](https://github.com/bodiyang/Taxcalc-Payroll) developed by Bodi Yang]
+
 2024-05-10 Release 3.6.0
 ------------------------
 (last merged pull request is

docs/index.md

@@ -57,7 +57,7 @@ The cross-model validation work with NBER's TAXSIM-27 model is described
 
 ## Latest release
 
-{doc}`3.6.0 (2024-05-10) <about/releases>`
+{doc}`4.0.0 (2024-06-01) <about/releases>`
 
 If you are already using Tax-Calculator, upgrade using the following command:
 

setup.py

@@ -3,7 +3,7 @@
 with open("README.md") as f:
     longdesc = f.read()
 
-version = "3.6.0"
+version = "4.0.0"
 
 config = {
     "description": "Tax Calculator",

taxcalc.egg-info/PKG-INFO

@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: taxcalc
-Version: 3.6.0
+Version: 4.0.0
 Summary: taxcalc
 Home-page: https://github.com/PSLmodels/Tax-Calculator
 Download-URL: https://github.com/PSLmodels/Tax-Calculator

taxcalc/__init__.py

@@ -14,4 +14,4 @@
 from taxcalc.utils import *
 from taxcalc.cli import *
 
-__version__ = '3.6.0'
+__version__ = '4.0.0'