When President Donald Trump touted his “big, beautiful tax bill” in 2017—the Tax Cuts and Jobs Act (TCJA)—most of the attention went to corporate giants and Wall Street winners. But beneath the headlines, architects and design professionals quietly emerged as one of the biggest beneficiaries of the law.

At the heart of this tax overhaul lies a provision that dramatically changed the way small businesses, including architecture firms, are taxed: the Section 199A Qualified Business Income (QBI) deduction. This allows eligible owners of pass-through entities—sole proprietorships, partnerships, S corporations—to deduct up to 20% of their qualified income before calculating their federal tax liability.

Critically, architects were among the few "service professionals" not excluded from this benefit. Professions like law, medicine, and accounting saw limitations or exclusions if income crossed certain thresholds. But architects and engineers were carved out of that restriction, thanks to industry lobbying and perhaps a broader recognition of the vital, infrastructure-adjacent role they play in economic development.

The result? A firm that earned $200,000 in net income could deduct $40,000 under the QBI rule—paying federal tax on just $160,000. For small to mid-sized architecture firms, this translated to real money that could be reinvested in staff, software, or new projects. It’s one of the few times in recent memory that tax reform explicitly favored creative professionals in the built environment.

The TCJA also dropped the corporate tax rate from 35% to 21%, a huge win for architecture firms that operate as C corporations. While most small firms aren’t structured this way, larger firms—and those looking to grow or attract outside investors—saw an incentive to consider C corp status more seriously.

However, not all changes were beneficial. The 2017 bill capped the state and local tax (SALT) deduction at $10,000, hurting architects in high-tax states like California, New York, and New Jersey. That move effectively raised the federal tax bill for many professionals and firm owners living in cities where the cost of doing business is already steep. The new legislation temporarily raises the SALT deduction limit to $40,000 starting in 2025. That benefit will start to decrease, for consumers who earn more than $500,000 of income. Both figures will increase by 1% yearly through 2029 and the higher limit will revert to $10,000 in 2030.

W-2 architects—those employed by firms rather than owning them—were another group left behind. The TCJA eliminated miscellaneous itemized deductions, meaning employees could no longer write off unreimbursed work expenses like professional licenses, home office setups, or continuing education. This shift subtly encouraged more professionals to consider self-employment or independent contracting, adding complexity to the industry's workforce landscape.

And while generous bonus depreciation rules now allow design firms to write off the full cost of equipment and software upfront, that benefit is only useful to firms actively investing in technology or expansion. For lean practices focused on labor over assets, this provision offers little.

As the QBI deduction is set to sunset after 2025, architects face uncertainty. Whether Congress renews the provision—or lets it expire—could reshape firm strategy, compensation, and structure once again.

In short, Trump’s “big, beautiful bill” was more than just campaign rhetoric. For architects and design firms, it provided real, tangible tax savings—and a rare policy nod to the profession’s economic importance. But like all architecture, its true value will depend on whether it stands the test of time.