6 Reasons Construction Companies Need an Accountant Who Understands WIP

6 Reasons Construction Companies Need an Accountant Who Understands WIP

A contractor can be busy, profitable on paper, and one job away from running out of cash. That gap usually traces back to one document most general-purpose accountants never build correctly: the work-in-progress schedule.

If your accountant can't produce a clean construction accountant WIP schedule, they're not doing your books wrong by accident. They're doing them the way they were trained to — for businesses that sell a thing and collect the money. Construction doesn't work like that. You bill ahead of work, fall behind on work you've already done, and carry retainage for months after the punch list is signed.

Here's what that actually means: your financial statements are only as honest as your WIP. And the WIP is only as good as the person building it. Here are six reasons that person needs to know construction cold.

1. Cash-basis books quietly lie about every job's profit

Most small contractors start on cash basis because their first accountant set it up that way. It's simple. It's also useless for telling you whether a job made money.

Under GAAP, construction contracts are recognized over time — what most people still call percentage-of-completion accounting. ASC 606 measures progress using an input method, most often cost-to-cost: the share of total estimated cost you've already incurred is the share of revenue you book. Spend 40% of the budget, recognize 40% of the contract.

Cash basis ignores all of that. It records revenue when the check clears and cost when you pay the bill, which are almost never the same month as the work. A job can look wildly profitable in March and underwater in May purely because of when invoices landed. You can't price your next bid off numbers that swing for reasons unrelated to the actual work.

2. Tax law may force percentage-of-completion on you anyway

This isn't just a GAAP preference. For tax, IRC §460 generally requires the percentage-of-completion method for long-term contracts — defined as contracts not completed within the same tax year they're started.

There's a meaningful carve-out. The small-contractor exception lets you skip §460's required method if your average annual gross receipts for the prior three years fall under an inflation-adjusted threshold (the 2025 figure was $31 million) and the contract is expected to finish within two years. Recent legislation also expanded relief for certain residential contracts. The threshold moves, and the rules around it have shifted in the last couple of years.

That's exactly the problem. Whether you're required to use percentage-of-completion, whether you qualify for the exception this year, and whether you should elect a different method anyway is a judgment call. A construction accountant makes it on purpose. A generalist finds out at audit.

3. Your WIP schedule is what a bonding company actually underwrites

Want to bid bigger jobs? A surety isn't underwriting your charm. It's underwriting your financials — and the document it reads hardest is the WIP schedule.

The surety wants to see, job by job, your contract value, costs to date, estimated cost to complete, percent complete, and billings against earned revenue. From that they set your single-job limit and your aggregate program — the total dollar value of work you can have under bond at once. That number is your bid ceiling.

A sloppy WIP shrinks it. Inconsistent estimates-to-complete, jobs that mysteriously jump from 60% to 95% in one period, fade on margins you swore were locked — every one of those makes an underwriter nervous, and a nervous underwriter caps you low. Strong contractor bonding financials, prepared by someone who knows what a surety reads, are often the difference between bidding the $2M job and watching a competitor take it.

4. Overbillings and underbillings belong on the balance sheet — not hidden in revenue

This is the single most common place generalist books go wrong, and it makes the P&L lie.

When you've billed a customer more than you've earned, that excess is a liability — a contract liability, or overbilling. When you've earned more than you've billed, that's a contract asset, an underbilling. Under ASC 606 these sit on the balance sheet, not in revenue.

Bury them in the income statement and you get a fun-house mirror. Overbilled jobs look more profitable than they are because you've recognized cash you haven't earned. Underbilled jobs look like dogs. You might fire a great project manager and promote a bad one based entirely on a posting error.

Here's the pattern a good construction accountant watches: a company drifting steadily more overbilled across all jobs is often borrowing tomorrow's cash to cover today's overhead. The P&L looks fine right up until the billings run out.

5. Real job costing tells you which estimators are losing you money

A construction accountant WIP schedule is only as good as the cost data feeding it. That means job costing that splits the four buckets — labor, materials, equipment, and subcontractors — for every project.

Roll them into one "cost of goods" line and you learn nothing. Split them and patterns jump out. One estimator's labor runs 15% over bid every time. Equipment cost is eating the margin on self-perform work you assumed was your strength. A particular sub is always a change-order machine.

Consider an illustrative example. Say you run 20 jobs a year averaging $400,000, and clean job costing surfaces that labor on your remodel work consistently overruns by 12%. On $3M of remodel volume, that's about $360,000 the estimates never accounted for. You don't need a turnaround consultant — you need someone who codes the costs right so the leak is visible. (Figures here are illustrative, not a specific client result.)

6. Retainage isn't current cash, and treating it like cash burns you

On most projects the customer holds back 5–10% — retainage — until the job is fully closed. You've earned it. You can't spend it. Sometimes you wait six months.

Book retainage receivable as if it were a normal current receivable and your balance sheet overstates near-term liquidity. Your working capital looks healthier than your bank account feels. Then payroll comes due on a job where $50,000 of your "cash" is parked in retainage you won't see until spring.

A construction accountant tracks retainage separately, ages it, and folds it into cash-flow forecasting so you stop getting surprised by a crunch you could see coming a quarter out.

Find a construction accountant who can actually build the WIP

Every one of these comes down to the same thing: construction is its own accounting discipline, and most CPAs simply weren't trained in it.

Steady Co is built for exactly this gap. The team blends Big 4 training with hands-on industry experience and offers fractional CFO support — so you get percentage-of-completion accounting done right, a WIP schedule a surety will respect, job costing that finds the leaks, and someone who can sit across from your bonding agent and your banker without flinching.

If your current books can't tell you which job made money or what your real bonding capacity is, that's the signal. Read Steady Co's verified reviews on Sam's List and book an intro call. Bring your last WIP schedule — or the fact that you don't have one. That conversation alone usually tells a contractor more than their last year of financials did.