Support and Resistance
Basics

What are support and resistance?

Support is a price level where demand has historically been strong enough to halt a decline and push price back up. Think of it as a floor — each time price falls toward this level, buyers step in. Resistance is the opposite: a ceiling where sellers consistently overpower buyers, capping any rally.

These levels are not arbitrary. They exist because markets have memory. Traders who missed a prior bounce at a level will wait for price to return. Traders nursing losses will exit when price recovers to their entry point. This collective behaviour causes predictable reactions at the same price zones again and again.

How support and resistance levels form

Three types of price action create reliable levels:

• Prior swing highs and lows. A point where price reversed sharply is where traders remember taking profits or being stopped out. When price returns, those memories drive action.
• Round numbers. On NSE, levels like 22,000, 22,500 and 23,000 carry disproportionate weight because institutions set limit orders at round numbers and options strike spacing aligns with them.
• High-volume consolidation zones. When price trades sideways for multiple sessions, the range edges become well-defended. Many traders entered in that zone and will react when price re-visits.

The polarity principle: support becomes resistance

One of the most important (and often under-appreciated) concepts in technical analysis is polarity: once a support level breaks, it often becomes resistance on any subsequent rally back to that zone — and vice versa.

The reason is straightforward. When support breaks, buyers who entered at that level are now underwater. If price rallies back, many will sell to exit at breakeven — creating fresh supply exactly where there was once demand. This is why traders speak of "testing" a broken level: the retest of old support as new resistance (or old resistance as new support) is a high-conviction opportunity to enter in the direction of the breakout.

Zones, not lines

In practice, support and resistance are better thought of as zones rather than exact prices. A level identified on the daily chart might span 30–80 points for NIFTY. Price does not always reverse at the exact prior swing point — it may overshoot slightly, shaking out weak hands, before reversing. Drawing your levels as a band (e.g. 22,450–22,500) is more practical than insisting on a single price point.

Confirming levels with the option chain

Indian derivatives traders have a powerful confirmation tool unavailable to pure chart readers: the option chain. Strike prices with the highest put open interest represent where option writers have sold puts in large size — an implicit bet that NIFTY will stay above that level. This concentration of short puts acts as institutional support.

Similarly, strikes with the highest call open interest represent heavy short-call positions — a bet that NIFTY will not close above that level at expiry. This is institutional resistance. See the OI-based support and resistance glossary entry for more detail.

When a price-chart support level aligns with a high-put-OI strike, the confluence of chart memory and institutional option positioning makes that level significantly more reliable.

A worked NIFTY example

Imagine NIFTY (hypothetical scenario) has recently bounced twice from the 22,200 zone on the daily chart. You open the weekly option chain and notice that the 22,200 strike carries the highest put open interest for the expiry three days away. The confluence of:

• Two prior chart bounces at 22,200 (price memory)
• A round number with strike spacing alignment
• Largest put OI concentration at 22,200 (institutional defence)

… makes 22,200 a high-conviction support zone. A trader might consider buying a NIFTY 22,200 CE (lot size 75) if NIFTY dips near 22,200 with a bullish candlestick confirmation — with a stop below the zone at, say, 22,100. Maximum risk per lot: approximately 100 points x ₹75 = ₹7,500 (before charges), a defined and manageable loss if the trade fails.

Common mistakes to avoid

• Drawing too many levels. If every 50-point interval is marked as support or resistance, none of them are meaningful. Select only the levels with two or more prior tests, significant volume, or option chain confirmation.
• Treating levels as exact prices. Levels are zones. Entering a trade the instant price touches a level — without a candlestick confirmation or volume signal — is premature.
• Ignoring the broader trend. Support in a strong downtrend is likely to fail. Give more weight to levels that align with the primary trend direction.
• Not updating levels. Markets evolve. A level from six months ago carries less weight than one formed in the last few weeks. Review your key levels every week.

Frequently asked questions

What is the difference between support and resistance?

Support is a price level where buyers have historically stepped in to halt a decline — demand exceeds supply. Resistance is where sellers cap rallies — supply exceeds demand. Both are defined by prior turning points, high-volume zones and round numbers.

Why does a broken support level become resistance?

Traders who bought at the support level are now holding losing positions. When price returns to that level, they sell to exit at breakeven — flooding the market with supply that turns the old demand zone into a new supply zone. This role reversal is called polarity.

How do I find support and resistance on NIFTY?

Combine chart-based methods (prior swing highs/lows on daily or weekly charts, round numbers) with option chain data. The strikes with the highest put open interest signal institutional support; highest call open interest signals resistance. Confluence of both methods produces the strongest levels.

Keep learning

• Reading Candlestick Charts
• Moving Averages Explained
• Trendlines and Channels
• Pivot Points Explained