Hiring an accountant for a construction company usually starts the same way a GC hires a sub: check references, see if the price works, figure out the rest later. Except the wrong one doesn't just miss a deadline (that'd be easy to spot). They mishandle retainage, skip the WIP schedule, and hand you financials that don't show how the jobs actually performed.
That's the real issue: construction books look fine right up until a late draw, a stretched pay app, or stacked retainage exposes the gap. This article covers what makes construction accounting different, what to screen for before you hire, and when a specialist CPA needs to step in instead of a bookkeeper.
How the Wrong Accountant Costs a Construction Company Money
The core problem is fit. A general contractor can have $2.5M in contracted work, six active jobs, and draws moving on different timelines, then get advice from a CPA using the same setup they'd use for a retail store or consulting firm. That breaks the numbers fast.
A generalist CPA applies the same chart of accounts and reporting cycle they'd use for any service business: year-end financials, standard receivables, quarterly reviews. None of that maps to how a GC actually moves money. Construction accounting runs job by job. Each project carries its own draw schedule, retainage holdback, sub spend, and materials spend.
The cost shows up in the reports you use to make decisions. When retainage gets lumped into general receivables, the balance sheet overstates cash you can actually touch right now and distorts the financial picture your surety reviews at bonding time. When job costs get entered without a cost code, your cash flow reports can't compare estimated costs to actual costs at the phase level. The next bid goes out with the same gaps the last one had.
Three Accounting Functions That Drive Job-Cost Visibility
Late visibility is what kills job-cost accuracy. A project can look fine on paper until the phase is already done and the overrun is locked in. If the drywall phase on the Oak Street renovation ran over budget, you need to see it before closeout, not after.
Three accounting functions drive that visibility: progress billing, WIP schedules, and retainage treatment. Each one feeds the next, and a mistake in one corrupts everything downstream.
Progress Billing
Progress billing is where the data starts. Each pay app ties a dollar amount to a specific phase of work completed, and a construction accountant needs to know how those billings map back to cost codes in the original estimate. If the billing doesn't track to the schedule of values, every report built on top of it, starting with the WIP, inherits the error.
A construction CPA earns their keep by lining the chart of accounts up with your estimating system so every vendor bill, purchase order, and labor hour lands on a specific job and phase.
WIP Schedule
WIP compares costs incurred to total estimated costs on each active project, then shows whether you're overbilled or underbilled. On the overbilled side, a liability hits the balance sheet and can create a current-year tax hit on money you haven't truly made yet. Underbilling hides cash strain until the project closes. Without monthly WIP preparation, you're flying blind on every active job.
Retainage Treatment
Billings to date should show the full invoice amount. If an accountant nets retainage out of billings, the over/under calculation comes out wrong and the rest of the financials follow it off course. The CFMA dedicates a WIP course to WIP preparation because the stakes are that high.
Why Certified Payroll on Prevailing Wage Jobs Requires Specialist Experience
Payroll compliance on public projects is a different category of accounting work. A general contractor wins a $1.8M school renovation bid subject to Davis-Bacon prevailing wage requirements, and suddenly every weekly payroll submission needs to match federally determined wage classifications, fringe benefit calculations, and WH-347 certified payroll reports. A generalist CPA who handles payroll for office-based businesses won't know where to start.
What certified payroll reports require. Each report breaks down hours by trade classification, base rate, and fringe benefits for every worker on a prevailing wage job. Fringe benefits can be paid as cash, directed to benefit plans, or split between the two, and each approach changes how the numbers land on the report.
Where errors trigger penalties. Misclassifying a journeyman as a helper or miscalculating the fringe rate triggers audit flags from the Department of Labor. Errors can result in:
Withheld payments on the project
Back wage assessments for affected workers
Penalties from the Department of Labor
Debarment from future public work
The downstream cash impact. Incorrect certified payroll reports hold up draws on public projects, which means the general contractor carries sub invoices and material costs longer while the payment sits in review. For any contractor bidding government or institutional work, prevailing wage experience belongs on the requirements list before the first interview.
Red Flags and Interview Questions for Screening a Construction Accountant
Most accountants who say they know construction can't back it up past the first real question. That gap shows up within the first quarter, sometimes in how they set up the books, sometimes in how they answer when you push on specifics. Knowing what to look for in the books and what to ask in the interview are two different screening tools.
Three Red Flags in the Books
These reveal a generalist running a generic setup, regardless of what they claimed in the bookkeeper or CPA screening conversation:
Retainage folded into general receivables instead of carried as a separate balance sheet line.
No WIP schedule prepared until year-end, or not at all.
Job costs entered without cost codes so there's no phase-level comparison between estimated and actual.
Any one of these means the accountant isn't doing construction accounting. The consequences, as described above, ripple through every financial report, bonding review, and future bid.
Tax Method Elections as a Screening Tool
Tax method elections separate specialists from generalists just as quickly. A $2.5M general contractor choosing between cash and accrual needs to know when retainage turns into taxable income. The completed contract method defers tax liability until job closeout; percentage-of-completion recognizes it as you go.
Both affect bonding, because owner compensation choices that chase tax savings can push down the ratios your surety uses to set your bond limit. A construction CPA weighs both sides before making the election.
Five Questions That Cut Through the Screening
"Walk me through how you prepare a WIP schedule for a general contractor with six active projects." If they hesitate, that's your answer.
"How do you handle unapproved change orders on the WIP?" Costs on unapproved changes shouldn't be recognized as revenue under percentage-of-completion rules. A specialist knows this cold.
"How would you structure my owner compensation to balance tax savings against bonding capacity?" This tells you whether they understand the surety relationship.
"Do you prepare certified payroll reports for prevailing wage projects?" If you're bidding public work, this is non-negotiable.
"Can you show me a sample job cost report from a current construction client?" The structure tells you whether they track at the code level or dump everything into broad categories.
If an accountant can't answer these with specifics, not generalities, they'll cost you time, money, or bonding capacity.
When a General Contractor Needs a CPA Instead of a Bookkeeper
Between overlapping projects, retainage, bonding requirements, and monthly WIP preparation, there's a point where a bookkeeper alone stops being enough. Where that line falls depends on how many jobs are running and whether bonding is in the picture.
Bookkeeper Stage: $1M to $1.5M
At $1.2M with two or three residential projects, a construction-savvy bookkeeper can code job costs, process pay apps, and keep the books reconciled while the owner files taxes with a general CPA. Retainage is less common on residential work, and bonding typically isn't a factor yet. The bookkeeper keeps the day-to-day clean; the CPA handles year-end.
CPA Stage: $2M and Up
By $2.5M with six overlapping projects, a commercial fit-out requiring bonding, and retainage stacking into six figures, the math changes. WIP schedules need monthly preparation, not year-end. The surety wants statements built for backlog analysis and real liquidity. Construction Executive reports that bonding companies typically apply a multiplier of approximately 10x to a contractor's net working capital to set maximum bonding program capacity. If that number is wrong because the books are messy, the surety sets a lower limit.
The Practical Team Setup
The accounting cost of an outsourced construction CPA is a fraction of an in-house hire: one CFMA survey found that in-house construction controllers average $142,249 in base salary plus $30,853 in bonuses. For most $1M to $3M general contractors, the practical setup is a construction-savvy bookkeeper for day-to-day coding and reconciliation paired with a specialist CPA for WIP, tax elections, and surety-ready financials.
Tools like Relay can help both roles by separating cash into dedicated buckets for tax, operating costs, and sub payments, which gives the bookkeeper cleaner data and gives the CPA a clearer starting point.
Build the Right Construction Accounting Team for Growth
The right accountant for a construction company isn't learning job costing, WIP schedules, or certified payroll on your dime. They've done it for other general contractors, and they bring that experience to every report your surety reviews, every tax election, and every bonding cycle.
When your accountant and bookkeeper both work from clean, separated account data, the monthly close gets faster and the numbers get more reliable. Relay lets you open up to 20 checking accounts1 with no monthly maintenance fees, so you can separate tax reserves, sub payments, and operating costs. Open a Relay account to give your accounting team the transaction clarity they need to keep your financials surety-ready.
1Relay is a financial technology company and is not an FDIC-insured bank. Banking services provided by Thread Bank, Member FDIC.
Frequently Asked Questions
Do I Need Both a CPA and a Bookkeeper for My General Contracting Business?
Usually, yes. The Practical Team Setup section above covers how to split the roles. In short, one keeps the daily data clean and the other turns it into WIP schedules, tax strategy, and surety-ready financials.
What Makes Construction Accounting Different From Regular Business Accounting?
Every project runs as its own profit center with its own draw schedule, retainage holdback, and sub payment timing. The Progress Billing section walks through how those moving parts connect from pay app to WIP to financials.
How Do I Spot Red Flags That My Accountant Doesn't Know Construction?
Check whether retainage sits on its own balance sheet line, whether WIP schedules run monthly, and whether job costs carry cost codes tied to the estimate. The Red Flags section above breaks down what each one means and why it matters.
Can the Wrong Accountant Hurt My Bonding Capacity?
Yes. Surety underwriters build your bond limit from the financial statements your CPA prepares. The Tax Method Elections section covers how the wrong call on owner compensation or revenue recognition can shrink that limit for no operational reason.
When Should a Growing General Contractor Switch to a Construction-Specialist CPA?
The CPA Stage section above covers the threshold in detail. The short version: once you're pursuing bonded work or running enough overlapping projects that monthly WIP becomes necessary, a generalist won't cut it. For most general contractors, that lands between $1.5M and $3M.
Does My CPA Need Prevailing Wage Experience if I Bid Public Work?
Yes. The Prevailing Wage section covers what certified payroll involves and what goes wrong when a generalist handles it. If government or institutional work is in your bid pipeline, this experience is non-negotiable.
