What's your biggest headache tracking costs across multiple jobs at once?

One of the trickiest things in construction accounting is keeping costs cleanly separated across several active jobs at the same time — especially when the same crew, supplier, or piece of equipment is shared across projects.

What's your biggest challenge here? Some things we hear often:
- Costs getting tagged to the wrong job (or no job at all)
- Subcontractor invoices that span more than one project
- Shared equipment costs that are hard to split
- Not realising a job is over budget until it's too late

How do you handle it, and what could QBO do better to help?