April 30, 2026
4 mins read
The 70:20:10 rule in SIP is a way of spreading equity investments across large-cap, mid-cap and small-cap funds in a fixed proportion. Instead of concentrating exposure in one segment, it builds a layered structure within the portfolio. The idea is to combine relative stability with measured growth exposure. Over time, this allocation approach may help manage market swings while keeping SIP investments consistent.
Equity markets rarely move in a straight line. Periods of growth are often followed by corrections, and volatility is a normal part of investing. For SIP investors, the challenge is not the volatility itself — it’s staying steady through it.
The 70:20:10 rule in SIP is often discussed as a way to bring some order into that uncertainty. Instead of putting the entire SIP amount into one type of fund, the allocation spreads exposure across three segments. A larger share goes into large-cap funds, which are generally more established companies. A smaller portion moves into mid-caps. An even smaller slice goes into small-caps.
Different market segments respond differently across economic cycles. Large-caps may show relatively lower fluctuations during corrections. Mid- and small-cap segments may deliver stronger growth during favourable phases but can also experience sharper swings. By combining these segments in a fixed ratio, the portfolio reduces reliance on a single market category.
The rule does not remove risk. It simply distributes it.That distinction is relevant to how the portfolio is structured during volatile phases.
To understand What is the 70:20:10 rule in SIP, think of it as a framework for dividing equity exposure. It suggests allocating:
70% to large-cap funds
20% to mid-cap funds
10% to small-cap funds
Large-cap companies are typically established businesses with relatively broader market presence. Mid-cap companies are often growing enterprises with moderate risk. Small-cap companies can expand rapidly, but their prices tend to fluctuate more sharply.
The rule does not promise higher returns. It simply distributes risk. Instead of placing the entire SIP amount into one market segment, it creates layers within the portfolio. This layered approach may help manage volatility while still allowing participation in growth cycles.
The 70:20:10 allocation divides a SIP amount across three equity categories in fixed proportions. Instead of concentrating the entire contribution in one segment, the investment is distributed between large-cap, mid-cap and small-cap funds. The allocation remains consistent irrespective of short-term market conditions.
For instance, if the monthly SIP amount is ₹15,000, it would typically be split as follows:
₹10,500 in a large-cap fund
₹3,000 in a mid-cap fund
₹1,500 in a small-cap fund
Each allocation contributes differently to overall portfolio behaviour.
Large-cap allocation (70%)
This segment generally includes established companies with broader market presence. Price movement may be relatively moderate compared to smaller segments.
Mid-cap allocation (20%)
Mid-cap exposure introduces participation in companies that are often in expansion phases. These may experience higher variability than large-caps.
Small-cap allocation (10%)
Small-cap exposure remains limited in proportion. This segment can reflect sharper movements, both upward and downward.
The structure does not depend on predicting market cycles. Instead, the 70:20:10 rule in SIP maintains proportional exposure across segments while SIP instalments continue at regular intervals. Over time, the allocation influences how fluctuations in different market-cap categories interact within the portfolio.
The benefits of the 70:20:10 rule for SIP are linked to how allocation influences overall portfolio behaviour. Rather than depending on a single equity segment, the structure distributes exposure across three categories. Each segment reacts differently across market phases, and this difference shapes the portfolio’s movement over time.
A portfolio that is concentrated in one category can experience sharper swings during certain cycles. When exposure is divided between large-cap, mid-cap and small-cap funds, the movement of one segment does not entirely determine overall performance. The structure does not remove volatility, but it changes how it appears within the portfolio.
Key benefits include:
Diversification across company sizes: Exposure is spread across established businesses as well as emerging companies, reducing reliance on one market group.
Participation in different growth phases: Large-cap funds may provide relative stability, while mid- and small-cap funds may show higher variability, including stronger movements during expansionary phases.
Measured exposure to higher volatility segments: Small-cap allocation remains limited, which prevents excessive concentration in more fluctuating stocks.
Structured allocation discipline: The predefined ratio encourages consistency instead of frequent reallocation between categories.
Reduced dependence on short-term trends: Since the allocation is predetermined, decision-making is less influenced by temporary market sentiment.
The benefits of 70:20:10 rule for SIP are typically associated with longer holding periods. Short-term fluctuations are possible, as all three segments are equity-based. The approach is designed to distribute exposure, not to eliminate market risk.
Additional Read: How to Invest in SIP
Over time, portfolio weights can shift without any change in contribution amounts. Variations in performance between large-cap, mid-cap and small-cap funds gradually affect their relative share. As a result, the overall mix may move away from the intended 70:20:10 allocation.
Rebalancing addresses this divergence. The exercise focuses on restoring the predefined proportions once deviations become noticeable. It is generally undertaken at intervals rather than on a recurring basis. Many investors prefer to review allocation annually and decide whether the structure continues to reflect the original distribution.
Rebalancing ensures that your portfolio continues to reflect the intended 70:20:10 structure. Over time, market movements may cause one segment to grow faster than others, altering the original allocation. When the difference becomes noticeable, adjustments may be considered to restore balance.
Steps to rebalance:
Check current portfolio weights
Review your portfolio statement and calculate the present percentage of large-cap, mid-cap, and small-cap exposure.
Compare with the 70:20:10 target ratio
Assess whether any category has moved significantly above or below its intended allocation.
Adjust future SIP contributions
Future installments may be redirected toward segments that have reduced in proportion, using a SIP calculator to project your adjusted returns.
Consider partial switching carefully
If deviation is substantial, limited reallocation between funds may be evaluated.
Review tax and exit load impact
Check applicable capital gains taxation and exit load before executing changes.
Avoid excessive adjustments
Frequent rebalancing may increase transaction costs and administrative complexity.
Rebalancing is a periodic review process. It supports allocation discipline while allowing SIP investments to continue without disruption.
The allocation should correspond with individual risk tolerance, investment horizon, and financial objectives rather than being applied uniformly to all investments.
Rebalancing is commonly reviewed annually or when portfolio allocation moves materially away from the intended 70:20:10 proportion.
Diversified equity or flexi-cap funds may be considered where direct access to specific market-cap categories is unavailable.
Allocation ratios can be modified to reflect personal financial goals, time horizon, and comfort with volatility.
The 70:20:10 framework generally relates to equity allocation. Debt exposure is typically structured separately within overall asset planning.
Volatility results in SIP instalments purchasing units at varying NAV levels, which is a feature of rupee cost averaging over time.
Risk is distributed across large-, mid-, and small-cap funds, reducing dependence on a single equity segment.
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