[system for shared financials]

I  want to start a bussines with 2 friends. The financial management it therefor complicated. Rent has to be payed by 3. income has to be devided by 3. investments have to be done by 3 persons, ect. Is there perhaps a system in Sl let's say a shared wallet or do we have to do the bookkeeping by hand. I am looking forwards to some tips or a solution. Xola