How do you know when you’re ready?

Ready for another baby? I had a baby april 2016. We are debating on starting to try for another. I just feel like we could be better off financially and my son being older it’d be easier. I know there’s no perfect time but planning a second is harder than the first! Lol money being better or my son being easier isn’t a guarantee either.. them being close in age is terrifying yet exciting to me.. so I’m curious how you decided? Thanks!