Risk Budget and Risk Contribution
A risk budget is the amount of risk allocated to a portfolio, strategy or position. Risk contribution is how much of the portfolio’s total risk comes from each holding — which can differ greatly from its share of the money, because volatile, correlated holdings contribute more.
A risk budget is how much risk you allow a portfolio, strategy or position to carry. Risk contribution shows how much of total portfolio risk each holding actually adds. A small but volatile, highly correlated holding can contribute far more risk than its share of the money suggests. Budgeting risk, not just money, helps keep one bet from dominating.
- Category
- Risk Management
- Reading time
- 3 min
- Also called
- Risk budgeting, Risk allocation, Contribution to risk
- Updated
Risk budgets in plain words
Portfolio building often starts by giving each return strategy its own slice of the total risk allowance — its risk budget.1
An asset's risk contribution is its marginal risk contribution multiplied by its weight in the portfolio.2
Risk parity is the special case where every asset gets an equal share of the total risk.2
How to set and check a risk budget
Choose the risk measure
Choose a risk measure — usually volatility, though tail risk and others are also used.2
Set the total budget
Decide the total portfolio risk you accept.
Split it
Give each strategy its share of the risk budget.1
Compute contributions
Multiply each asset's marginal risk contribution by its weight to get its risk contribution.2
Compare with the budget
Find holdings whose contribution exceeds their budget.
Adjust weights
Trim over-budget holdings and rebalance.
Worked examples
Example 1 — Money vs risk
Risk-heavy stocksA hypothetical portfolio holds 80% bonds and 20% stocks; analysis shows stocks contribute 70% of total risk.
| Stocks weight | 20% |
| Stocks risk share | 70% |
Risk contribution is the marginal contribution multiplied by the asset weight, so volatile stocks dominate.2
Example 2 — Over budget
On budgetThe hypothetical budget gives stocks 50% of risk, so the investor cuts stocks to 12%, bringing their share to 50%.
| New weight | 12% |
| Risk share | 50% |
Each holding now uses exactly the share of risk the budget gave it.1
Example 3 — Correlation surprise
Hidden overlapTwo hypothetical funds each have a 10% risk budget but move together, so in a sell-off both lose and combined risk acts like 20% on one bet.
| Combined | 10% + 10% → one bet |
Contributions depend on more than weight, and correlated holdings add more risk together.2
Capital allocation vs risk budget
| Aspect | Capital allocation | Risk budget |
|---|---|---|
| Splits | Money | Risk |
| Volatile asset | Same weight | Smaller weight |
| Shows | Where money is | Where risk comes from |
| Correlation | Ignored | Included |
Where investors use it
Allocation
Setting Portfolio Allocation by risk.
Diversification
Checking real Diversification.
Rebalancing
Triggering Rebalancing.
Limits
Linking to Value at Risk limits.
Advantages and disadvantages
Advantages
- Shows what really drives portfolio risk.
- Stops one holding dominating.
- Includes volatility and correlation.
- Works for assets, strategies or traders.
Disadvantages
- Needs volatility and correlation estimates.
- Correlations change in crises.
- More complex than money weights.
- Volatility is not the only risk.
Going deeper
Read as far as you need. Each level builds on the one before it.
Budget first
Beginner
Construction starts by splitting the risk budget across the strategies meant to generate returns.1
Contribution maths
Intermediate
Risk contribution = marginal risk contribution × asset weight.2
Wider use
Advanced
Investors who set their own risk budgets for each strategy can use the same framework, and it also works for multi-asset and bond portfolios.1
Common mistakes
Using money weights as risk
Compute contributions.
Ignoring correlation
Measure it.
Setting no total budget
Decide the total first.
Never updating
Recheck as markets change.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- A risk budget caps how much risk each part may carry.
- Risk contribution shows where risk comes from.
- Contribution = marginal contribution × weight.
- Volatile, correlated holdings contribute more.
- Risk parity gives equal contributions.
Frequently asked questions
Is risk parity a risk budget?
Can traders use it?
Which risk measure?
Further learning
- Portfolio Allocation
Allocating money.
- Correlation
Why holdings overlap.
- Value at Risk
Another risk limit.
- Diversification
Spreading risk.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- CFA Institute. An Integrated Risk-Budgeting Approach for Multi-Strategy Equity Portfolios (Digest Summary) (opens in a new tab) Checked .
- Vanguard. Combining active managers: A practical approach (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.