All calculations in a model are “positive by default” – that is, they will be positive whether they are costs, revenues or something else. That means that when something in the model is negative, it is probably a mistake.

But often you want to have items on a report shown as negatives – such as costs or outgoings.

To make an item like [Operating costs] negative, right click on it in a report and choose “Negate”. You will see that brackets appear around it.

Note that the same item can be negative on one report and positive on another.