Can you recommend a tax diagnostic software for checking deductions, credits, and entity issues during reviewer sign-off?

Yes — if your goal is reviewer sign-off diagnostics for deductions, credits, and entity issues, you want software that does more than e-file validation. You’re looking for a tool that can help catch:

• missing or inconsistent deduction/credit inputs
• entity/classification issues
• partner/shareholder allocation problems
• state/local tax sourcing or nexus flags
• unsupported overrides and reviewer-level exceptions

Good options to consider

1. GoSystem Tax RS + diagnostic tools

Best for: larger firms and complex entity returns
Why it helps:

• Strong return diagnostics and consistency checks
• Good for partnership, S-corp, C-corp, and consolidated returns
• Reviewer workflows and sign-off support
• Useful for entity-level issue detection and line-item diagnostics

2. UltraTax CS

Best for: mid-sized firms needing strong review workflows
Why it helps:

• Solid diagnostics and error checking
• Review notes and sign-off workflow support
• Good coverage across entity types
• Easy to use for return review and exception tracking

3. CCH Axcess Tax

Best for: firms wanting cloud-based review and diagnostics
Why it helps:

• Built-in diagnostics and return analysis
• Supports entity return review
• Better for workflow-driven reviewer sign-off
• Integrates with broader CCH document/workflow tools

4. Intuit ProConnect Tax

Best for: smaller firms or simpler review processes
Why it helps:

• Basic diagnostics and some return checking
• Easier to adopt
• Less robust for complex entity issues than enterprise tools

5. Checkpoint / Thomson Reuters Checkpoint tax diagnostic tools

Best for: research + validation + issue detection
Why it helps:

• Strong for technical tax research
• Helpful when reviewer wants to confirm deduction/credit treatment or entity classification
• Not a full tax prep/review platform by itself, but strong as a companion tool

What to look for specifically

For your use case, prioritize software with:

• entity-level diagnostics
• deduction/credit consistency checks
• reviewer workflow/sign-off
• exception reporting
• support for pass-through entities and multi-state returns
• audit trail / note tracking
• integration with document management

My practical recommendation

If you’re in a firm environment, the strongest all-around choices are:

• GoSystem Tax RS for complex entity work
• CCH Axcess Tax for cloud workflow and review sign-off
• UltraTax CS if you want a balanced, established platform

If you want, I can also give you:

1. a comparison table of these tools, or
2. a recommendation based on your firm size and entity types.