- Onshore vs MainStreet: MainStreet publicly frames fees as a capped percentage of identified savings, which some buyers prefer for risk-sharing. Onshore’s stated emphasis is on producing evidence-based documentation via a combination of automation and human review for finance-led buyers.
- Onshore vs Neo.Tax: Both vendors emphasize contemporaneous documentation and reduced interview burden. Differentiation may depend on workflow design (software-led vs service-led), division of labor between buyer and vendor, and how audit support and ownership of positions are structured.
- Traditional accounting firms: Large accounting firms typically handle complex, multi-jurisdictional positions and broader tax planning integration, but generally at longer timelines and higher fees.