# Machine Time vs Labor Time in Millwork Costing

Canonical: https://millbase.ca/blog/machine-time-vs-labor-time-in-millwork-costing
Author: [Coby Birenbaum](https://www.linkedin.com/in/cobybirenbaum/)
Published: 2026-10-19
Updated: 2026-10-19
Archive edition: 2026-07-01

Machine time and labor time are different resources.

Machine time and labor time are different resources. An operator may support a machine intermittently or supervise more than one process. Define what each measure includes before adding rates together, otherwise the model can double count effort.

## Set the boundaries

- Distinguish setup, attended processing, unattended processing, and downtime.
- Identify labor already included in a machine rate.
- Use a consistent unit and activity base for the rate.
- Keep job and operation identity attached to recorded time.

## A costing example

A hypothetical machine runs for two hours while an operator spends one hour directly supporting it. Charging two machine hours and one labor hour may fit one model, but only if the machine rate excludes that labor. Document the assumptions.

## Validate with real jobs

Compare the model with actual operation patterns. A rate built for one product mix may not remain suitable after equipment or staffing changes.

## Related reading

- [Cabinet Shop Job Costing: Separate Margin From Markup](https://millbase.ca/blog/cabinet-shop-job-costing-separate-margin-from-markup)
- [Labor Tracking by Cabinet Job and Workstation](https://millbase.ca/blog/labor-tracking-by-cabinet-job-and-workstation)

## Definitions and further reference

- [Intuit: job costing and cost records](https://quickbooks.intuit.com/learn-support/en-us/help-article/job-costing/track-job-costs-quickbooks-desktop/L2X01vi47_US_en_US)

## How Millbase can help your shop

### Bring job-cost reviews back to the recorded work

Use [Millbase project tracking](https://millbase.ca/#projects) to keep a cabinet job and its sub-projects together, then compare estimates with recorded labour and material costs. [Insights and reports](https://millbase.ca/#insights) help the team inspect the people and workstations behind a total and export supported results for the next review.

Ask the [Millbase AI agent](https://millbase.ca/#how-it-works) a question grounded in your workspace records. For example: *“Compare this project’s estimated and actual labour, then break the logged hours down by workstation.”* You can select a project or worker, ask follow-up questions, and request [supported reports and CSV exports](https://millbase.ca/#insights).

Check the date range, job scope, and recorded inputs before changing a quote. Keep the accounting treatment of overhead, tax, and revenue in the appropriate financial process; a shop-floor cost breakdown is only as complete as the inputs recorded.

## Explore the wider topic

For the broader workflow and decisions behind this guide, read [Cabinet Shop Job Costing: Separate Margin From Markup](https://millbase.ca/blog/cabinet-shop-job-costing-separate-margin-from-markup).

## Frequently asked questions

### Can machine runtime stand in for labor hours?

Not reliably. Attendance, setup, support, and concurrent work can differ significantly from runtime.

### Should idle machine time be assigned to jobs?

Follow a defined costing policy and keep the reason visible. Avoid arbitrarily loading unrelated idle time onto whichever job is open.