Multi-Account Tracking & Data Quality
Transaction History
Definition
A complete record of every buy sell dividend reinvestment and cash movement in the portfolio over time.
Why it matters
It is the foundation of accurate return calculation cost basis tracking and tax reporting.
What most investors miss
The gap between what the term means and how it is usually applied.
They keep current positions but discard historical transactions. Without full history cost basis return and tax calculations become estimates.
How to read it
Maintain transaction history from the first purchase in every account. Reconstructing it later is difficult and often impossible.
Multi-account lens
How this term reads differently across brokers and accounts.
Transaction history is one of the hardest data problems in multi-account portfolios. Each broker stores it differently exports it in different formats and may only retain it for a limited period.
Related terms
Terms that connect to transaction history.
Reconciliation
The process of checking that transactions balances cash and holdings agree across your records and actual accounts.
Cost Basis
The original purchase price of a holding used to calculate the gain or loss when the position is sold.
Realized Gain
The profit from a position that has been sold and converted to cash.
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