Tax and Legal

What Investment Records Should You Keep From Day One?

By Walid Mograbi · 2026-05-20 · 2 min read

Good record keeping reduces later confusion and makes tax review far easier than rebuilding the history after the fact.

Why this lesson matters

Order-routing path can affect fill quality, which makes execution transparency part of a sensible broker comparison.

The core idea

• Execution venue and path can affect the outcome.
• Transparency helps the investor judge credibility.
• Commission alone is not the full comparison.

Practical example

Two brokers can look similar on the fee page, yet differ meaningfully in how consistently they seek better fills for client orders.

Common mistakes to avoid

• Comparing brokers by commission only.
• Ignoring execution-path transparency.
• Assuming all routes produce identical outcomes.

Quick checklist

• Execution disclosure
• Routing policy
• Fill quality
• Price improvement language

Key takeaway

A good lesson improves judgment, risk control, and execution discipline before it changes action.

Important caution

Understanding the execution path can protect more than a small fee difference does.

Further reading

• https://investors.interactivebrokers.com/en/trading/bestx.php
• https://www.finra.org/investors/insights/where-do-stocks-trade