To +1 this, small business accounting software will often make it hard for us to log more than one email address for an account (or we can log it, but the system will only ever send to one).

If you can do this and set up forwarding, all parties will be able to receive the invoice and any discussions relating to financials.

This may not seem like a big deal to some but we deal with a lot of couples who are trying to keep the burden of managing the household equal. It’s hard to do so when only one person is receiving invoices! It causes issues sometimes with discussion (we keep people in the loop but rely on them to tell other members of the household) and as the external party there isn’t a lot we can do.

(To clarify further, we do include as many emails as requested when sending actual emails, but anything which goes through our accounting software can only go through a single email address. We try to mitigate issues as much as possible.)