As the expiration of key Tax Cuts and Jobs Act provisions looms, tax professionals are preparing for what could be another period of upheaval.
In 2017, when the TCJA was first enacted, tax departments struggled to keep pace with new regulations and guidance. According to our recent Bloomberg Tax survey of 434 tax professionals, 92% of tax professionals working in tax at the time reported that the TCJA’s implementation was moderately to highly disruptive, and 60% said it took a year or more to fully implement the changes.
The coming year could bring more of the same. Eight in 10 respondents are moderately or very concerned about the potential impact of these changes. Yet many rely on outdated, manual processes that make adjusting quickly to major legislative changes difficult.
With the benefit of hindsight, tax professionals have a unique opportunity to apply the lessons of 2017 and invest in automation now to avoid repeating the same costly mistakes.
Manual processes still dominate tax departments
One of the most striking findings from our survey is that many tax professionals continue to rely on manual workflows despite the increasing complexity of tax compliance. Seventy-six percent of respondents said they still use Excel for tax calculations, and 63% manually gather data from enterprise risk management and general ledger systems to perform tax calculations.
These outdated processes create inefficiencies and make it harder for tax teams to respond quickly to legislative changes.
In its time, the TCJA was the most sweeping tax code overhaul in decades. It required tax departments to significantly modify or even replace their workpapers to reflect the changes.
While 62% of survey respondents believe they can update their existing workpapers without major difficulty, one in four anticipate significant challenges, and 10% will need to create entirely new workpapers.
This manual burden could put firms at a disadvantage when deadlines are tight and compliance requirements shift rapidly.
Scenario modeling is challenging yet critical
When big changes are on the horizon, running multiple tax planning scenarios helps organizations make decisions and manage risk. Automated tax solutions streamline this process by allowing tax teams to evaluate different legislative outcomes and come up with strategies to address them.
Firms that lack automation in their tax workflows may have a tough time keeping up with the pace of change — especially if Congress waits until the eleventh hour to pass legislation, as was the case in 2017.
Eighty-eight percent of respondents reported it is moderately or very difficult to conduct scenario modeling for TCJA changes, and only half have started the process. One respondent noted, “We need as much lead time as possible to make changes to our models, and significant changes take even more time to incorporate. Running multiple scenarios is a very manual and difficult process.”
Quantifying the cost of inaction
Failing to invest in automation before a substantial tax law change can be a costly mistake.
Among respondents, 71% who experienced the enactment of TCJA in 2017 reported wishing they had invested earlier in tax technology to better manage the complexity of compliance updates. Manual processes not only slow response times but also drive costs, as nearly 40% of respondents anticipate a $100,000 or higher increase in consulting budgets if significant TCJA-related changes occur.
By leveraging tax automation tools and centralized tax-focused software, firms can optimize how they engage with external consultants. Automation allows tax departments to take ownership of routine processes, such as calculations and compliance adjustments, reducing reliance on consultants for these tasks. Instead, consultants can be utilized more effectively on high-impact projects that drive strategic value, such as tax planning, risk management or navigating complex regulatory changes. This shift enables firms to streamline compliance while ensuring external expertise is directed toward creating lasting organizational benefits.
Preparation now means greater confidence going into 2026
The data is clear: firms investing in automation today will be better positioned to handle the upcoming tax changes confidently. Here’s how to get ahead:
- Integrate tax technology. Replace manual calculations in Excel with automated tax workpapers that integrate with source data and automate data gathering and calculation processes.
- Adopt scenario modeling tools. Invest in software that allows for real-time legislative modeling so you can analyze multiple potential outcomes before changes take effect.
- Reduce reliance on external consultants. Implement in-house tax software to keep control over your data, reduce consulting budgets and respond quickly to regulatory shifts.
With less than a year until TCJA provisions are set to expire, the time to act is now. Taking proactive steps to automate and modernize your workflows will put you in a far stronger position than companies that wait until the last minute.
Major tax law changes can be disruptive, but with the right technology, you don’t have to relive the turmoil of 2017. Embrace tax-focused automation to remain agile, efficient and ready to navigate whatever changes come next.