Construction Accounting in Columbia Falls, MT:
Job Costing, WIP, and Bonding Support

A restaurant recognizes revenue when a meal is served. A contractor recognizes revenue as a project is completed — percentage-of-completion method. Billing a client $200,000 does not mean you have earned $200,000. If the job is 60% complete, you have earned $120,000. Recording the full invoice as revenue overstates income, makes your P&L unreliable, and surprises you at year-end with a tax bill based on money you haven't collected.

Every material purchase, labor hour, equipment charge, and subcontractor invoice must be allocated to a specific job. Without job-level tracking, you have a company P&L but no job P&L. You know the business made $180,000 last year — but you have no idea which jobs were profitable and which were disasters. By the time you figure it out, the bad patterns have already repeated on three more projects.

General contractors and owners withhold 5–10% of each progress payment until project completion. On a $900,000 project, that is $45,000–$90,000 sitting in accounts receivable for months. A balance sheet that doesn't separate retainage receivable from current receivables understates working capital, misrepresents cash availability, and causes surety companies to understate your bonding capacity.

Columbia Falls construction cash flow has a hard seasonal shape: work ramps April through October, billing follows with a 30–45 day lag, collections trail by another 30 days, and retainage doesn't land until punch list is cleared — sometimes February. Without a rolling 13-week cash flow projection, the winter gap is a surprise every year. It shouldn't be — it is structurally predictable from your backlog and payment terms.

Surety companies and commercial lenders evaluate construction financials at a level of detail most business owners don't expect. Working capital ratio, backlog-to-equity, and underbilling position are ratios your surety agent calculates before approving any single job over $500,000. Clean, construction-specific financials — prepared by a CPA — are a prerequisite for Flathead County public work, MDOT contracts, and school district projects.

The foundation of WIP accounting. If you have incurred $165,000 on a project with total estimated costs of $275,000, the project is 60% complete. Earned revenue = contract value × 60%. The percentage-of-completion method smooths revenue recognition across the project lifecycle and produces a P&L that reflects actual work performed — not just cash billed or collected.

When you have billed more than your percentage-of-completion warrants, the difference is overbilled. Overbilling is a liability — you owe the owner that work. Moderate overbilling is acceptable on fast-moving projects; systematic overbilling across a portfolio is a red flag for surety companies because it signals that cash is being used from future project revenue to fund current operations.

When you have earned more than you have billed, the difference is underbilled — an asset on your balance sheet. Temporary underbilling is normal when billing falls behind work performed. Chronic underbilling signals billing management problems: draws not submitted on time, change orders not billed, or project managers who don't understand the billing cycle. Each underbilled dollar is working capital you are loaning to the owner interest-free.

The WIP schedule is not an internal management report — it is a financial statement presented to sureties and lenders alongside your balance sheet and income statement. It must reconcile to your financial statements: total costs in the WIP must match costs booked in your accounting system, and billed amounts must match your AR. A WIP that doesn't reconcile raises immediate questions about the reliability of your entire financial package.

Any public works construction contract exceeding $25,000 triggers Montana prevailing wage requirements. This threshold applies to the total contract value — a $30,000 parking lot at a county facility requires prevailing wage, even if a single subcontractor does the work.

Montana DLI publishes prevailing wage rates by county and trade classification each year. Flathead County rates apply to Columbia Falls public projects. Rates differ by trade: carpenter, electrician, plumber, heavy equipment operator, and laborer rates are all distinct. Using the wrong classification — e.g., paying a carpenter at laborer rate — is a prevailing wage violation.

Every contractor and subcontractor on a prevailing wage project must submit certified payroll reports weekly to the contracting agency (county, school district, MDOT). The report shows each worker's name, classification, hours worked, rate paid, and deductions. Submitting certified payroll is the contractor's responsibility — not the subcontractor's alone on projects where the GC holds the public contract.

Glacier National Park construction projects funded by the National Park Service use Davis-Bacon federal prevailing wage rates — different from Montana state prevailing wage. MDOT projects with FHWA funding also use federal Davis-Bacon rates. A contractor bidding Glacier-adjacent work must determine whether state or federal rates apply before the bid is submitted.

Prevailing wage work requires accounting systems that track hours by worker, by day, by project, and by trade classification simultaneously — not just total hours per job. Payroll software must be configured to produce certified payroll reports in the required format. Contractors who manually reconstruct certified payroll after the fact routinely make errors that trigger compliance reviews.

Equipment purchased and placed in service before December 31 can be fully expensed under Section 179 (2026 limit: $2.56M under OBBBA) or 100% bonus depreciation (permanently restored under the One Big Beautiful Bill Act, signed July 2025). A Columbia Falls contractor buying a $180,000 excavator in December can deduct the full purchase price in the current tax year — rather than depreciating over 5–7 years. Timing matters: equipment must be placed in service, not merely ordered, before year-end.

Small contractors averaging under $30 million in annual gross receipts over the prior 3 years may elect to use the completed-contract method (CCM) for long-term contracts — deferring all revenue and costs on a project until the project is substantially complete. For a Columbia Falls contractor finishing a large commercial project in February, CCM can defer $400,000+ of income from one tax year to the next. PCM is required for all contractors above the small contractor threshold.

Owner-operators of S-Corps must pay themselves a reasonable salary for services rendered — the IRS scrutinizes S-Corp owners who take low salaries to minimize payroll taxes. For a Columbia Falls construction S-Corp with $350,000 in net income, reasonable compensation typically falls between $90,000 and $130,000 for an owner-operator GC. Underpaying triggers IRS reclassification of distributions as wages, with FICA penalties.

If your company constructed or significantly renovated a building in the current year, a cost segregation study reclassifies portions of the real property cost into 5-, 7-, or 15-year personal property — accelerating depreciation and reducing current-year taxable income. For a Columbia Falls contractor who built a $600,000 shop facility, cost segregation may accelerate $150,000–$200,000 in depreciation into the first year.

Contractor owner-operators can shelter significant income through SEP-IRAs (25% of net self-employment income, up to $69,000 for 2024) or Solo 401(k)s (up to $69,000 employee + employer combined). Contributions must be made by the tax filing deadline, including extensions. A $69,000 SEP-IRA contribution by a contractor in the 24% federal bracket saves $16,560 in federal taxes.