I had an accountant when I was single (I can do many things extraordinarily well, but paying bills on time is NOT one of them, and I know it). When my husband and I got together / merged finances HE took over all the bills.
I've missed my accountant for 10 years.
Why?
He periodically gets all lordy (not saying you are!!! Just MY story with HIM) about how I "should" be able to do x, y, z... just because it's easy for him. It's NOT easy for me. I'm not stupid, but people are good at different things. Paying bills was easy for him (a pain in the neck, to be sure, it always is is my understanding), so he'd periodically try to "make" me do the bills.
Well, THAT'S easy. Time to find a new accountant. Hilarity did not ensue. He physically wanted ME to do it. Nope. Huh-uh. Not gonna happen. I know what happens when I pay bills myself. Late fees up the wazoo, messed up credit, some things in collections, and other things shut off.
HERE'S WHAT DID HELP.
We went to a cash only system, and the system was 100% equal.
Meaning... every pay period we EACH got the same amount of money. This money was for ALL personal expenditures. Hair, clothes, restaurants, gym memberships, subscriptions.... those are personal things. HE could pay for the gym (which he liked) I could save mine up and do snowboarding instead (the cost for an entire season of snowboarding is about $50 a month saved over the rest of the year... the same as his gym membership). Either of us could go out to lunch whenever we wanted (assuming we still had the cash available), boys/girls nights, whatever. WITH NO ACRIMONY. Because we had the same amount.
Here's how it worked:
We separated out ALL our bills (mortgage, utilities, etc.) and separated those from personal bills (subscriptions, etc.), and separated out the grocery budget, our son's budget (clothes, school stuff, etc.)
At each pay period WE were paid first. We got our personal money. Which wasn't a lot. Then we pulled out our food money. Then we paid all our bills. Whatever was left over was family money. And NOT to be touched, not a single dollar of it, without consulting with the other person. Sacrosanct.
Converting to a cash system was hard on my HUSBAND at first. Even though he paid the bills, he was used to free access to the rest of it. He was used to buying lunch at work every day for $10. Not a lot, right? Well... in a 2 week pay period, that's $200. Then he'd be spending an average of $40 a day. Um. That's $560. Nickle and dimed charges that add up. THEN there were the "big" purchases (a few hundred here, a few hundred there).
What we could afford when we started this was $100 each, every 2 weeks. So going from a bare min of over $800 a month, to $200 a month was reeeeeeally hard on him. Granted, it was gravy for me, because I hadn't had that much to spend on myself in YEARS.
It took a few months to get the kinks out of the system (aka to get used to having a finite amount of cash on hand)... but after that? Well there were MANY problems in our marriage... but money wasn't one of them.
He (until very recently) STILL gets all lordy about being the one paying the bills... but day to day money stuff? Not a problem. We each have the same.