Intermediate
Understanding Transaction Costs and Slippage in Backtests
A practical, cost-first look at why backtested returns rarely survive contact with live markets. Covers the full Indian cost stack (brokerage, STT, GST, stamp duty, exchange charges), bid-ask spread and market impact, how to model slippage realistically, why high-turnover strategies suffer more than low-turnover ones, break-even edge analysis, and how to build a cost-aware backtest that won't lie to you. Built for quant analyst aspirants, prop trading applicants, and traders systematizing their own strategies, grounded throughout in NSE and Zerodha-level cost realities.
Transaction CostsSlippage ModelingBacktestingMarket ImpactStrategy TurnoverBreak-Even AnalysisSystematic Trading
MODULES
6
DURATION
~4.2 hrs
TRACK
Quantitative Finance
What You'll Master
Why paper returns and executable returns diverge, and how large that gap typically is
How to price the full Indian cost stack: brokerage, STT, GST, stamp duty, and exchange charges
How bid-ask spread and market impact create slippage even before you account for broker fees
How to model slippage realistically in a backtest using fixed, percentage, and volume-based methods
Why high-turnover strategies are far more cost-sensitive than low-turnover ones, and how to quantify the drag
How to run a break-even analysis to find the minimum edge a strategy needs to survive real-world costs
How to build a cost-aware backtesting checklist and audit an existing strategy against it
Why live trading always costs more than the backtest predicted, and how this shows up in quant and prop trading interviews
Access Level
LEARNER
Everything included
Full Text Playbooks
Actionable Exercises
Mobile Reading Mode
Lifetime Updates
Curriculum Breakdown
Chapter 1: Why Backtested Returns Lie
4 Lessons▶
What Are Transaction Costs and Slippage, and Why Do They Break Backtests?9 min read
▶
The Anatomy of a Trade: Brokerage, STT, GST, and Exchange Charges in India10 min read
▶
Gross Returns vs Net Returns: Why "Backtest First, Costs Later" Is a Trap9 min read
▶
Case Study: A Strategy With 22% CAGR on Paper That Returned 4% Live12 min read
Chapter 2: The Explicit Cost Stack
4 Lessons▶
Brokerage, STT, Stamp Duty, and SEBI Charges Explained Line by Line10 min read
▶
Zerodha and Discount Brokers: The Real Cost of a Round-Trip Trade9 min read
▶
Building a Cost Model: Coding the Indian Cost Stack Into a Backtest11 min read
▶
Case Study: How Costs Eat a High-Frequency Strategy on Bank Nifty12 min read
Chapter 3: Slippage and Market Impact
4 LessonsChapter 4: Strategy Sensitivity and Break-Even Analysis
4 Lessons▶
Why High-Turnover Strategies Suffer More Than Low-Turnover Strategies9 min read
▶
Holding Period, Turnover, and the Cost Drag Formula10 min read
▶
Break-Even Analysis: How Much Edge Do You Need to Survive Costs?11 min read
▶
Case Study: Comparing Cost Drag Across a Daily and a Monthly Rebalance Strategy12 min read
Chapter 5: Building Realistic Backtests
4 LessonsChapter 6: Capstone: From Backtest to Live Trading
4 Lessons▶
Paper-to-Live Transition: Why Live Trading Always Costs More Than the Backtest Predicted10 min read
▶
Putting It Together: A Cost and Slippage Audit Framework11 min read
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How Cost and Slippage Questions Show Up in Quant and Prop Trading Interviews10 min read
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Final Case Study: Full Cost and Slippage Audit of a Systematic Strategy13 min read