Pay shared tab before bills come out?!

I think it would be a great idea if you could send money using the shared tab before the payment is actually made. I have a shared tab with my partner that we use to pay all household bills, but I currently need to have ALL money in my account for the bill to go out, once that’s paid, he can go in and pay his share. I don’t always have enough money to pay the bill myself so that shared tab basically becomes pointless as he has to send me his half before it shows up on the shared tab.

It would be SO helpful if he could add his half of the money before the payment is made (you know when the preview comes up saying payment will be taken in 1/2/3 days).

Hopefully I’ve explained that properly - if there is a way to do this, I’m sorry and I’d love to know how!