I look after all our finances. Accounts are joint but I decide how much extra to pay off mortgage/save, pay bills, decide how much to spend on a holiday, renegotiate mortgage/insurances etc. I've just been told by other half not to stuff it up. I'm looking at changing car and I'll decide what we can afford etc - I'm pretty much able to decide all matters financial. He trusts me and I have the time which he doesn't.