Construction job costing is the practice of assigning every hour, delivery, machine hour, and subcontractor invoice to the job and the cost code it belongs to, so the number you see mid-job is one you can still act on. Most contractors get accurate job cost only after the job closes, when it is a history lesson. A system captures cost where it happens in the field and posts it into QuickBooks against the right customer:job, item, and account within the week.
Why the job cost number shows up too late
Time arrives as a lump on Friday afternoon
A foreman texts hours: forty for Luis, thirty-eight for Rob. No split between the footings and the slab, no cost code, no note about two hours spent moving material for another crew. Payroll enters it against the job and the detail that made it useful is gone.
Vendor bills land after the decision that needed them
The ready-mix invoice for the March pour arrives in late April. The pour is buried, the next one is scheduled at the same assumed unit price, and the variance that would have caught it sits in an unopened envelope.
Owned equipment costs nothing on paper
If you do not charge an internal hourly rate for your own excavator, the job that ran it for three weeks shows no equipment cost and reads as profitable. Fuel, tires, and the payment sit in overhead where no job answers for them.
Committed cost is invisible until it becomes a bill
Signed subcontracts and issued purchase orders exceed the budget left on a division, and the accounting file does not know it, because a commitment is not a transaction. The overrun is real weeks before it appears.
Cost codes mapped to the QuickBooks chart of accounts
This mapping gets built before any automation, because everything downstream depends on it. Use whatever cost code numbering your estimator already has.
| Cost type | Sample cost code | QuickBooks item | Posting account | The mistake we usually find |
|---|---|---|---|---|
| Direct labor | 03-100-L forming labor | Two-sided service item, Labor:Concrete Forming | 5010 Direct Labor against 4010 Contract Income | Hours post to payroll expense with no customer:job, so labor never reaches job cost |
| Labor burden | 03-100-B | Service item, Burden:Field | 5015 Labor Burden | Burden left in overhead, so every labor code reads light against the estimate |
| Material, purchased direct | 03-300-M ready-mix | Non-inventory part, Material:Ready-Mix | 5100 Job Materials | Bill coded to a generic materials account with no cost code on the line |
| Material, issued from the yard | 06-100-M framing lumber | Inventory part transferred to the job | 5100 Job Materials from 1400 Inventory | Yard stock expensed at purchase, so the job that consumed it shows no material cost |
| Equipment, owned | 01-540-E excavator hours | Service item, Equipment:Excavator Hour | 5300 Equipment Cost against 4900 Equipment Recovery | No internal rate exists, so owned iron is free on every job |
| Equipment, rented | 01-540-R scissor lift | Non-inventory part, Rental:Lift | 5310 Equipment Rental | The rental invoice arrives after closeout and posts to a period, not a job |
| Subcontractor, contracted scope | 09-250-S drywall | Service item, Sub:Drywall | 5400 Subcontract Cost | Entered without linking to the subcontract, so committed cost never draws down |
| Retainage held from a sub | 09-250-R | Item mapped to the liability account | 2300 Retainage Payable, not an expense | Retainage netted into the expense line, misstating payables and job cost |
| Other direct job cost | 01-700-O permits, testing, dumpsters | Non-inventory part, Other:Permits and Fees | 5500 Other Job Cost | Coded to general and administrative expense, so the job looks cheaper than it was |
Wiring the field to the ledger
Time entry that carries a cost code, not just a job
The crew member or foreman picks the job, then the cost code, from a list scoped to that job’s budget. Splitting a day across two codes takes one extra tap. A long list gets used carelessly, so it stays scoped to codes that have budget.
Foreman approval as a real gate
Hours sit pending until the foreman approves the crew’s day. Approval releases them to payroll and to job cost together, so the two never diverge. Edits after approval are recorded with who made them.
Burden applied on the way in
Payroll taxes, workers compensation, and benefit costs apply as a rate against approved hours when they post, not at year end. The rate is reviewed on a schedule rather than set once and forgotten.
Commitments recorded when they are issued
A signed subcontract or issued purchase order creates a commitment against the cost code immediately. The job cost view shows spent, committed, and remaining as three columns, which is what lets a project manager act before the bill exists.
One reconciliation with a named owner
Weekly, someone compares what the field recorded against what posted and clears the exceptions: unassigned bills, hours with no code, receipts with no order. A short list when the front end works.
Systems on either side of this
- QuickBooks automation and posting rules — Approved hours, receipts, and vendor bills post as items against customer:job rather than being keyed twice.
- mobile field forms for time and delivery tickets — Crew time, delivery ticket photos, and meter readings arrive from a phone on the right cost code.
- custom reporting and job dashboards — Spent, committed, and remaining by cost code in one view, built against the codes your estimator uses.
Is this a fit for your business?
A good fit when
- You run more than three jobs at once and cannot tell mid-job which one is bleeding
- Your estimator uses cost codes the accounting file does not recognize
- You self-perform work and carry subcontractors on the same jobs
- You own equipment and charge nothing for it internally
Probably not a fit when
- You run one job at a time and settle up at the end
- You want a full ERP with scheduling, estimating, and accounting in one platform
- Your books are not reconciled, which needs a bookkeeper before automation
What to have ready
- Your cost code list, even if it lives in an estimating spreadsheet
- The QuickBooks chart of accounts and item list as they stand today
- One recent job you can walk us through end to end
Questions we get asked
Does this work with QuickBooks Online or only Desktop?
Both, with different mechanics. Desktop and Enterprise carry more native job costing structure, including advanced item types and a stronger estimate-to-actual view. Online needs more structure built around it, usually with projects, classes, and a disciplined item list. We map to whichever you are on rather than pushing a migration.
Do we have to move off our current time tracking app?
Usually not. If it captures job and cost code and exposes an export or an interface, we read from it and handle the posting logic. What matters is whether cost code is captured at entry, because no downstream work can reconstruct which code an hour belonged to.
What is a two-sided item and why does it keep coming up?
A two-sided item carries both an expense account and an income account, so the same item records what a task cost and what it billed. That is what makes estimate-versus-actual possible at the cost code level. Single-sided items give you a clean profit and loss statement and a job cost report that cannot compare anything.
Our cost codes are a mess. Do we fix them first?
No, and starting with a code cleanup is how these projects stall. We build against the codes your estimator uses today, get the flow working, then handle consolidation separately once you can see what is actually being used.
Related
- daily field reports from the crew
- progress billing and pay application preparation
- QuickBooks automation services
- workflow automation for construction companies
Tell us what the process looks like now and we will map what a system would need to do. No obligation, and you keep the map either way.