Dean Cross

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The Day Trading Rules Handbook

Which Ones Really Work — More Than 50 Rules Tested on Up to 37 Years of Data

Before you risk a dollar on day trading, find out which of its rules actually work.

For the calendar rules, tested the same way, see The Seasonal Stock Market Handbook.

Trade the first hour. Buy the stock gapping up on news. Watch VWAP. Never hold overnight. Aim for twice what you risk. Never risk more than 1% on a trade.

Every new day trader hears these rules. Almost no one shows how they did across thousands of trades, after trading costs. This book does. It tests 57 of day trading's best-known rules on up to 37 years of US stock prices and five years of minute-by-minute SPY data, and gives each one a plain verdict.

Why it matters now

In June 2026, the $25,000 pattern day trader rule ended. More people can day trade than ever, but studies of real day traders still find that most lose money. This book asks the question those studies can't: if you follow the rules perfectly, with no mistakes and no emotion, do the rules themselves make money?

Tested on real market data

Every rule went through the same tests:

  • Up to 37 years of daily prices for every actively traded US stock priced $1 or more, including companies that later failed
  • Five years of SPY's minute-by-minute prices
  • A month of real trade-by-trade quotes, used to check what a trade really costs
  • Every result shown after trading costs, again at double costs, and with the cost at which it would break even
  • Rules compared with random trades at the same moments, so a good-looking win rate can't hide a coin flip
  • A luck check on every result, and on the long daily record, the years before 2009 compared with the years since, to show which rules have faded

How each rule is judged

For each rule, the book does four things:

  1. It states the rule the way traders usually hear it.
  2. It turns the rule into a clear claim that can be checked.
  3. It tests that claim on real market history, after trading costs.
  4. It gives a verdict.

Every verdict is one of five:

  • Supported. The data backs the rule.
  • Supported, with a limit. The rule holds up, but only in part, only before trading costs, or only in a way most people don't expect.
  • Not supported. The rule did no better than ordinary trading.
  • Contradicted. The data points the other way.
  • Too few cases to judge.

Where to go next

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