Having a SAHP can actually save money. It really does for us. I do work, but I went remote and increased my earning potential that way. I work around my home duties instead of fitting in my home duties around work.
These are the ways it increases our overall income:
He can work more because I relieved him of every household duty so he can work evenings and weekends and come home to a clean house, a hot meal, and completely relax instead of having anything else to think about on top of work.
He uses the time to do what he enjoys such as the gym and that's how he relaxes and in turn is able to work more and more effectively.
Lower food budget because I enjoy cooking and can shop around during the day and cook from scratch it means our food budget (2 adults, 1 child, 2 animals) remains around £200-250/month.
So not much junk, no convenience foods, he gets lunch for work most days, and we do packed lunch for school.
Zero childcare costs this one's a no brainer. My work means I can get the child and take her every day and we never need childcare for work so absolutely no costs, and these can be astronomical.
Increasing my income the whole COVID thing really helped kickstart the digital age and it benefited us because I went remote at work and then did some training and skills in the time I'm not at work to be able to do an increasing number of freelance jobs paying more and more as I become more specialised and skilled.
So overall having me at home (incidentally where I like being) saves us quite a bit with the added benefit of not struggling with stress.