Job costing lives or dies on one thing: whether the hours logged against a job actually reflect the hours worked on that job. A perfect costing spreadsheet built on guessed or reconstructed hours is still guesswork — it just looks precise.
Where job costing usually breaks
- Crews work multiple jobs in a day but log one lump total under whichever job they remember first
- Time gets logged days later, after the details of which task took how long have faded
- Hours sit in a spreadsheet for weeks before anyone reconciles them against the job
Tagging every entry, not just every timesheet
Job costing needs a Project and a Task on every row of the timesheet — not just a total for the week. When each entry carries its own project and task, a crew that split their Tuesday across two jobs shows up as two accurate entries, not one blended guess.
Close the loop with QuickBooks
Once approved hours export to QuickBooks Online as TimeActivity records — carrying the customer and service item behind each project — job costing reports inside QuickBooks are working from real, approved field data instead of a spreadsheet reconstruction assembled after the fact.
The real fix is timing, not tooling
The single biggest improvement to job costing accuracy isn't a feature — it's closing the gap between when work happens and when it's logged. A timesheet filled in the same day is far more accurate than one filled in from memory a week later, regardless of what software is behind it.