RSI & MACD

Every technical indicator falls into one of two categories, and understanding the distinction shapes how you use them.

Neither category is superior. Leading indicators warn you early but are prone to premature signals in strong trends — a stock can remain overbought for weeks during a powerful rally. Lagging indicators are more reliable in trending markets but react too slowly during sharp reversals. The strongest setups emerge when a leading and a lagging indicator agree with each other.

The RSI was developed by J. Welles Wilder in 1978 and remains one of the most widely used momentum oscillators. It measures the speed and magnitude of recent price changes and outputs a value between 0 and 100.

The default lookback period is 14 days, which Wilder found to be the most balanced window. Shorter periods (7-day) make the RSI more sensitive and trigger more signals. Longer periods (21-day) smooth it out and reduce noise. For swing trading Indian stocks, the 14-day default works well for most situations.

The Key Levels: 70 and 30

Real Example: TATAMOTORS Oversold Bounce

TATAMOTORS experienced a sharp selloff over 8 sessions, falling from Rs.640 to Rs.565. By the eighth day, the 14-day RSI had plunged to 25 — deep in oversold territory. The following day, the stock printed a hammer candle at the Rs.565 support zone with above-average volume. When RSI crossed back above 30 on the subsequent session, it confirmed the reversal. Over the next two weeks, TATAMOTORS rallied approximately 12% to Rs.632.

The key is patience: do not buy simply because RSI is below 30. Wait for the RSI to cross back above 30 — that is your confirmation that selling pressure is genuinely fading.

Divergence occurs when the price chart and the RSI indicator move in opposite directions. This disagreement between price and momentum is one of the most powerful signals in technical analysis because it reveals hidden strength or weakness that raw price action does not show.

Bullish Divergence

Price makes a lower low, but RSI makes a higher low. This tells you that even though the stock dropped to a new low, the selling momentum is actually weakening. The bears are losing conviction, and a reversal may be brewing beneath the surface.

Bearish Divergence

Price makes a higher high, but RSI makes a lower high. The stock reached a new peak but the upward momentum behind it was weaker than the previous peak. The bulls are running out of energy, and a correction may follow.

Real Example: WIPRO Bullish Divergence

WIPRO was in a downtrend, falling from Rs.440 to Rs.395, where it found temporary support. It rallied briefly, then dropped again to Rs.388 — a new lower low. But on the RSI chart, the reading at the Rs.388 low was 32, compared to 28 at the earlier Rs.395 low. The RSI had made a higher low while price made a lower low — a textbook bullish divergence. Within the next ten sessions, WIPRO reversed and climbed back above Rs.420.

The power of divergence is that it catches reversals before they become obvious on the price chart. By the time the stock is visibly rallying, the divergence trader is already positioned.

The MACD was developed by Gerald Appel in the late 1970s. It is a trend-following momentum indicator that shows the relationship between two exponential moving averages. While RSI tells you whether a stock is overbought or oversold, MACD tells you the direction and strength of the trend.

The Three Components

• MACD Line: The 12-day EMA minus the 26-day EMA. When short-term momentum exceeds long-term momentum, this line is positive.
• Signal Line: A 9-day EMA of the MACD Line. It smooths the MACD and acts as a trigger for buy/sell decisions.
• Histogram: The visual bar chart showing the difference between the MACD Line and the Signal Line. When the histogram is above zero and growing, bullish momentum is accelerating.

How to Read MACD Signals

Real Example: BAJFINANCE Trend Shift

BAJFINANCE had been correcting from Rs.7,400 to Rs.6,600 over several weeks. The MACD Line was below both the Signal Line and the zero line — confirming the downtrend. As the stock found support around Rs.6,600 and started recovering, the MACD Line first crossed above the Signal Line near the Rs.6,750 level, generating a buy signal. A week later, the MACD Line also crossed above the zero line, providing bullish confirmation. Traders who entered on the signal-line crossover and held through the zero-line confirmation rode a move from Rs.6,750 to Rs.7,200 over the next three weeks.

Using RSI and MACD together gives you both a momentum filter (RSI) and a trend confirmation (MACD). When both indicators align in the same direction, the probability of the trade working in your favour increases significantly.

The Combined Framework

Notice the last row: RSI above 70 does not automatically mean sell, especially when MACD confirms the trend is strong and accelerating. In a powerful rally, RSI can stay above 70 for weeks. This is where the combination saves you from premature exits.

The MACD Histogram as a Leading Signal

Here is a subtlety that separates experienced traders from beginners. The MACD histogram often starts shrinking before the actual crossover occurs. If the histogram has been making tall green bars and then prints a shorter green bar, bullish momentum is decelerating — even though the MACD Line has not yet crossed below the Signal Line. This shrinking histogram is an early warning to tighten your stoploss or book partial profits.

• Histogram growing (taller bars): Momentum is accelerating in the current direction. Hold your position.
• Histogram shrinking (shorter bars): Momentum is decelerating. Tighten stoploss and prepare for a potential reversal.
• Histogram flipping sign (green to red or vice versa): The MACD crossover has occurred. Act on your trading plan.