On android at least, I’ve seen that incoming transfers and splitting bills do not count towards reducing the total spending amount shown.
Example
I pay 50 pounds for a dinner for 2, and split the bill using Monzo. The other person sends me 25 pounds, and I label it as eating out. My month’s spending on eating out shows 50 pounds instead of 25.
Yup, spending reports are designed to only count outgoings at this time.
The ability to offset spending through incoming payments such as Monzo.me splits, refunds, and expenses is a common request and is something the team has expressed interest in tackling over time as the product grows. Remember, this is only the first version!