Bonus Depreciation vs. Section 179 for Construction Companies

Recent legislation made bonus depreciation permanent, but for construction companies, permanence does not equal simplicity. The real planning opportunity is not whether equipment can be expensed—it’s how depreciation decisions impact cash flow, bonding capacity, lending relationships, and long-term growth.

At CSH, we frequently see contractors default to full expensing without fully evaluating the downstream consequences. In construction, those consequences can be significant.

Construction companies are capital-intensive and often highly leveraged. Equipment purchases are commonly financed, and depreciation decisions directly influence taxable income, equity, and working capital. While accelerated deductions can improve short-term cash flow, they may also weaken key financial metrics that lenders and sureties rely on.

This is where the distinction between bonus depreciation and Section 179 becomes critical.

Bonus depreciation allows qualifying assets to be expensed immediately with no dollar limit. For rapidly growing contractors, this can substantially reduce current tax liability.

However, bonus depreciation also reduces book equity quickly, which can negatively affect bonding capacity and compliance with loan covenants. Because bonus depreciation applies automatically unless a taxpayer elects out, many contractors use it without fully understanding the financial statement implications.

Section 179 offers greater flexibility. Contractors can elect how much to expense, allowing them to manage taxable income while preserving balance sheet strength. For closely held construction companies that prioritize bonding and banking relationships, this level of control is often more valuable than maximizing deductions.

The tradeoff is that Section 179 is subject to dollar limits and phaseouts, which must be monitored carefully as companies scale.

The most common mistake is treating depreciation as a tax-only decision. In construction, depreciation planning should be a coordinated effort involving tax, audit, and advisory teams. The optimal approach depends on factors such as equipment mix, financing structure, growth strategy, and surety expectations.

CSH’s construction specialists help contractors model depreciation strategies across tax liability, financial statements, and bonding impact. This integrated perspective allows companies to optimize deductions without unintentionally restricting future growth.

For contractors planning equipment purchases in 2026, depreciation strategy is one of the highest-impact planning areas to revisit early.