When should accounting firms upgrade their tax software?

Every year, accounting firm leaders face the same uncomfortable truth: the moment they most feel the need to change their tax technology is the worst possible time to act on it. By the time April 15 passes and extension deadlines recede, the urgency fades and firms miss the best window for tech adoption. 

Firms that treat Q3 as a strategic planning period head into the following busy season with a measurable advantage. Here’s why. 

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When should accounting firms upgrade their tax software?

How many firms are adopting AI and automation? 

Why tax extension season is perfect for testing new software

How to track successful tax software implementation

Why timing is so important for tax software planning

When should accounting firms upgrade their tax software? 

For most firms, the answer is almost always “sooner than they did.” With AI and tax automation seeing unprecedented adoption rates this past year, this summer marks an especially crucial time to act. 

Technology shortcomings are most painful during peak season, but firms don’t have the bandwidth to evaluate or overhaul anything while returns are flying out the door. The result is a predictable cycle: 

Workflow friction surfaces during busy season 
Good intentions form in the spring 
Hesitation sets in through early summer 
A narrow Q3 window arrives and either gets used or wasted 

Firms that don’t act in Q3 typically face one of two outcomes:

They make a rushed decision in the fall, too late to implement properly.
They defer entirely and repeat the same frustrations twelve months later. 

Q3 is the perfect post-pain, pre-commitment period. The frustrations of the last busy season are still recent enough to be motivating, and the next one is far enough away that a considered, well-supported transition is still possible. 

How many firms are adopting AI and automation? 

The technology gap between firms that have acted and firms that haven’t is widening, which is a big part of why Q3 matters. 

According to the Thomson Reuters 2026 State of Tax Professionals Report, 57% of tax, audit & accounting firms now say AI is their top technology investment priority, up from 47% in 2025 and 35% in 2024.   

Broader tax automation trends tell a similar story: 44% of firms now automate up to one-quarter of their tax workflows and 27% automate up to half. Just 11% report using no automation at all, down from 18% last year. 

Large accounting firms are pulling ahead  

In the same study, 63% of large firms indicated that they were in the proactive or optimized stage of technology development, compared with just 35% of small firms, a gap that’s expected to widen as AI capability keeps evolving. 

Efficiency isn’t the only initiative at stake. The Thomson Reuters Future of Professionals Report 2026 found that 74% of professionals across legal, tax, audit, and compliance now use AI several times a week, yet 41% still lack access to AI tools built specifically for professional work on verified, authoritative content. That’s the kind of gap that leaves firms exposed on quality, accuracy, and client trust. 

The data makes clear that the gap between adopters and non-adopters compounds every year. 

As firms compare tax software, AI should be evaluated as more than a general productivity feature. The most valuable tools are those that support the work tax professionals already need to do with greater speed, accuracy, and confidence. That means looking for AI capabilities that are built into the tax workflow, grounded in authoritative tax content, and designed to keep a professional in control of the final judgment. 

Source-backed research and answers that cite authoritative tax guidance, not generic web content 
Workflow automation that reduces manual data entry, document review, and repetitive preparation steps 
Review and error-detection features that help identify inconsistencies before returns move forward 
Built-in security, privacy controls, and governance features that protect client data 
Training, implementation support, and clear guardrails so staff understand when to rely on AI and when to escalate to human review 

Why tax extension season is perfect for testing new software 

Here’s another reason why Q3 is important for tax software planning: extension season provides a built-in trial window for new software. The extended deadline gives a lower-stakes production environment where volume is meaningful but not overwhelming, and staff have more bandwidth. 

Going live before October 15 means: 

Staff complete real returns on the new platform before January, not alongside 600 others 
Workflow questions surface and get resolved during a forgiving period 
Muscle memory and confidence develop before the pressure arrives 

Firms that use extension season as a structured pilot aren’t experimenting with client outcomes. They’re stress-testing a system before it matters most, and the timing helps clear two common blockers at once: the 2026 State of Tax Professionals Report found that 51% of firms cite a lack of time and resources, and 47% cite implementation cost, as the top barriers to further automation. 

How to track successful tax software implementation 

The gap between firms that benefit from new tax technology and firms that struggle often has less to do with the software itself and more to do with how the transition was managed. That’s why partners like Thomson Reuters go the extra mile with: 

Dedicated implementation specialists 
Comprehensive training resources 
24/7 technical support to get your team up and running quickly 

In practice, that entails: 

A detailed implementation roadmap built before go-live, with data migration timelines, staff training sequencing, and milestones tied to the extension season calendar 
Firm champions identified early: senior staff who receive deeper training and become the first point of contact for colleagues, driving faster adoption and fewer support escalations 
Parallel-run periods where legacy and new systems run simultaneously on selected returns 
Round-the-clock support during go-live, the first week of live production, and the ramp into busy season 

Training is where firms most often fall short. The shows up directly in results: among firms with a named AI strategy, the Future of Professionals Report found 66% say AI is meeting or exceeding expectations for creating value at work, compared with just 22% where no strategy exists. 

Why timing is so important for tax software planning 

By mid-September, the realistic planning window starts to close. Firms that begin conversations in July can finish evaluating solutions, negotiate terms, and implement with enough runway for a meaningful extension-season pilot. Firms that wait until October are essentially committing to another year on their current platform. That’s why Q3 is so important for tax software upgrade planning. It’s the perfect window to enact change at a time when technology upgrades are more important and transformative than ever. 

Want more guidance on tax software planning? Our 1040 tax workflow automation playbook examines efficiency opportunities at each stage of the tax process and explains how your firm can take action. Check out our exclusive guide to learn about advanced data automation, simplified review, and modern client collaboration today!