01
Exact by construction
Financial amounts use exact decimal representations, checked arithmetic, and named rounding at calculation boundaries.
About Exabasis
Tax basis should be reproducible, not merely plausible.
Exabasis gives CPA firms and internal tax teams a durable home for annual basis work.
The problem worth solving
Basis work crosses asset registers, prior returns, ownership records, debt schedules, limitation workpapers, and review notes. Each handoff creates another place for source facts, corrections, and carryforwards to drift apart.
Exabasis organizes that work around one annual close, so the number a reviewer sees remains connected to the source package, dated facts, calculation evidence, and approval that produced it.
Product principles
Confidence comes from a better record
02
History stays intact
Dated facts and append-only corrections preserve both what applied and what was known when a close was prepared.
03
Review stays attributable
Source evidence, calculation lineage, findings, replies, and reviewer decisions remain attached to the exact close version.
See it in context