The main difference between a W-9 and a 1099 is that you fill out a W-9, while the business or entity that is paying you ...
This is a Python version of the AGAGE 12-box model described (first as a 9-box model) in Cunnold et al., 1983. Subsequently modified in Cunnold et al., 1994 and Rigby et al., 2013. This version is ...