SumIt

Most family office accounting problems trace back to the same root cause: generic software that was never designed for layered entity structures. SumIt was founded after one of its co-founders encountered this directly while managing his family’s real estate businesses and was forced onto spreadsheets. That origin shapes what the product does and does not attempt to be.

SumIt functions as a purpose-built general ledger for single and multi-family offices. Its core capability is multi-entity accounting with automated intercompany eliminations and consolidated reporting across complex ownership hierarchies. Rather than requiring users to maintain separate books per entity, it centralises all entities under a single login. Key capabilities include:

• One-click multi-layer consolidation supporting equity pick-up, full consolidation, and partial ownership structures
• Native integration with Addepar for investment data reconciliation, BILL for inter-entity accounts payable, Plaid and Mastercard Open Finance for bank feeds across 10,000+ accounts, Ramp for expense management, and Arch for private investment management
• Entity map visualisation of ownership structures
• Stakeholder-aware reporting for both high-level principal summaries and detailed accountant-level outputs
• Implementation timelines of 6 to 12 weeks with an in-house onboarding team

Deployed clients include Mariner Ultra, which migrated over 150 entities and consolidated reporting to a single click, and Ieomia, which replaced more than 65 QuickBooks files. Pricing is custom and based on entity count, integration requirements, and migration complexity, with no publicly listed rates. SumIt is focused strictly on accounting workflows. Family offices seeking a single platform that also covers investment performance reporting, banking, or client portals will need to evaluate broader platforms. Its value is specifically in general ledger depth and purpose-built multi-entity architecture, not platform breadth.