Do individuals need to pay for developing software containing pyqt5?

If you use PyQt5 to develop personal software, you generally don't have to pay. PyQt5 is an open source software, which is distributed under GPL(GNU General Public License), which means that you can freely use, modify and distribute PyQt5, including commercial use. However, if the software you develop with PyQt5 contains code licensed by GPL, you need to abide by the terms of GPL, including publishing your software as open source software and including the GPL license in your code. It is recommended that you check the license and related terms when using PyQt5 to ensure that your use meets the requirements.