An equity curve is a line chart that plots the value of a trading account or strategy over time. It is the most intuitive way to visualize a strategy's performance and is typically the first thing a trader examines after running a backtest. While summary metrics like Sharpe ratio and maximum drawdown provide important numbers, the equity curve reveals patterns and dynamics that single metrics cannot capture.
What the equity curve shows
A steadily rising equity curve with small, brief dips indicates a consistent strategy with low drawdowns. A curve that rises sharply but has deep drops shows a strategy with high returns but significant risk. A flat curve with a sudden spike suggests the strategy's returns are concentrated in a few events rather than spread across many trades.
The slope of the equity curve represents the rate of return. Changes in slope can indicate shifts in the strategy's effectiveness, possibly due to changing market conditions. A strategy that produced a steep upward slope for three years but has flattened out may be experiencing alpha decay as its edge diminishes.
Analyzing drawdowns on the equity curve
Drawdowns appear as peaks followed by declines before the curve eventually recovers to make a new high. The depth of these declines is the drawdown magnitude, and the time from peak to recovery is the drawdown duration. The equity curve makes it easy to spot whether drawdowns are frequent but shallow, rare but deep, or concentrated in specific market conditions.
An equity curve that shows deep drawdowns during the 2008 financial crisis or the 2020 COVID crash tells the trader that the strategy is vulnerable to market crises. An equity curve that is flat or positive during these periods suggests the strategy has defensive characteristics or is genuinely uncorrelated with the broader market.
Equity curve versus benchmark
Plotting the equity curve alongside a benchmark (such as the S&P 500) provides visual context. If the strategy's curve rises and falls in tandem with the benchmark, the strategy may simply be capturing market beta rather than generating alpha. A strategy curve that diverges from the benchmark, especially during market downturns, suggests independent return sources.
Equity curve analysis pitfalls
A smooth equity curve in a backtest is not always a positive sign. It can indicate overfitting, where the strategy has been tuned so precisely to historical data that it appears to perform consistently. The true test is whether the curve remains smooth on out-of-sample data that was not used in the optimization process.
It is also important to consider the scale of the y-axis. A logarithmic scale is more appropriate for longer time periods where compounding makes early performance appear flat relative to later performance on a linear scale.
Practical example
A trend-following strategy shows an equity curve that rises steadily from 2015 to 2019, drops 12% during February 2020, then surges 35% through the rest of 2020 as strong trends emerge in the COVID-era markets. The curve flattens through 2021 as markets become range-bound. This visual tells a clear story about the strategy's relationship to market regimes: it thrives in trending markets and struggles in sideways conditions.
How Tektii helps
Tektii generates detailed equity curves for every backtest, with drawdown periods highlighted and benchmark comparisons available. The platform allows traders to zoom into specific time periods, overlay multiple strategy curves for comparison, and examine how equity evolves across different market regimes. By making the equity curve a central part of performance analysis, Tektii helps traders understand not just how much a strategy made, but how it made it.