CSC Corptax vs Longview Tax

The verdict at a glance

CSC Corptax scores higher overall (77 to 73), but the right pick depends on what you weight.

CSC Corptax is an enterprise corporate income tax system that runs US federal, state and international compliance, ASC 740 provision and Pillar 2 reporting from one database, built for large corporate tax departments.

Longview Tax is insightsoftware's income tax provision and reporting platform for corporate tax departments at multinationals, calculating current and deferred tax under ASC 740 or IAS 12 with ETR forecasting, state-level provision, Pillar Two and country-by-country reporting.

Quick facts

• CSC Corptax AF score. 77/100
• CSC Corptax implementation. High
• CSC Corptax best fit. Fortune 1000 US tax departments
• Longview Tax AF score. 73/100
• Longview Tax implementation. Medium
• Longview Tax best fit. Multinationals on IFRS or US GAAP

Dimension by dimension

• Compliance depth. CSC Corptax 79, Longview Tax 80. Edge: Longview Tax.
• Scalability. CSC Corptax 84, Longview Tax 78. Edge: CSC Corptax.
• AI / agent readiness. CSC Corptax 52, Longview Tax 50. Edge: CSC Corptax.
• Support. CSC Corptax 86, Longview Tax 70. Edge: CSC Corptax.
• Implementation. CSC Corptax 63, Longview Tax 73. Edge: Longview Tax.
• Pricing transparency. CSC Corptax 38, Longview Tax 32. Edge: CSC Corptax.
• Tax content & coverage. CSC Corptax 89, Longview Tax 83. Edge: CSC Corptax.
• Integrations & data flow. CSC Corptax 70, Longview Tax 76. Edge: Longview Tax.

Pick CSC Corptax if

• A US-parented multinational filing hundreds of state returns and Forms 5471 that wants provision and compliance on one data set
• A Fortune 1000 tax department bringing outsourced compliance back in-house, using vendor loan staff to bridge busy season
• A Pillar 2 in-scope group that wants GIR, QDMTT and safe harbor work fed by the same ownership and provision data

Pick Longview Tax if

• A multinational reporting under IFRS or US GAAP that wants provision, ETR forecasting, CbCR and Pillar Two estimates on one data set
• A tax department with a capable in-house administrator that wants to own configuration without leaning on IT or consultants
• A Canadian or US group that needs state-by-state provision or the EIFEL interest limitation inside the provision workflow

Further reading

• Global Tax and Regulatory Intelligence (GTI) is available (CSC Corptax, Aug 2026)
• Corptax GMT files UK Pillar 2 returns directly to HMRC (CSC Corptax, Jun 2026)
• Corptax Connectors Suite outlined (CSC Corptax, Feb 2026)
• insightsoftware reorganizes into Lineos, Certent and Simba brands (Longview Tax, Sep 2026)
• Longview 26.3 adds Lineos AI to the Excel add-in and public CbCR (Longview Tax, Jul 2026)
• Software and Services Agreement updated (Longview Tax, Jun 2026)

Keep exploring

• The full CSC Corptax review: scores, pricing, and where it fits.
• The full Longview Tax review: scores, pricing, and where it fits.
• Avalara Property Tax vs CSC Corptax
• Bloomberg Tax Provision vs CSC Corptax
• Bloomberg Tax Workpapers vs CSC Corptax
• CSC Corptax vs itamlink

Both reviews are updated on a rolling cycle by our research agents.