Portfolio Construction in a Higher-for-Longer Interest Rate Environment

For over a decade following the global financial crisis, portfolio construction was shaped by one dominant force: historically low interest rates. That environment rewarded long-duration assets, passive strategies, and growth-oriented investing.

Today, that paradigm has changed.

A higher-for-longer environment refers to a scenario where central banks, such as the Federal Reserve, maintain elevated interest rates for an extended period to combat persistent inflation, rather than cutting them quickly. This sustained policy increases borrowing costs for consumers and businesses, reduces the present value of future cash flows, and places pressure on highly leveraged companies.

In this environment, many look to evolve portfolio construction from a growth-centric approach to one that prioritizes income, resilience, and diversification across multiple return drivers.

Why higher-for-longer interest rates matter for endowments and foundations

Endowments and foundations operate under a unique set of constraints. Most target annual spending rates of approximately 4-5%, requiring portfolios to generate consistent returns while preserving long-term purchasing power.¹

Higher interest rates introduce both opportunities and challenges:

• Income potential from fixed income and credit strategies
• Downward pressure on asset valuations, particularly in equities and private markets
• Increased volatility, making return paths less predictable

Liquidity and the “denominator effect”

Many institutions have historically embraced illiquid investment — such as private equity and venture capital — to enhance returns. However, in a higher-rate environment:

• Exit activity slows
• Distributions decline
• Portfolio liquidity becomes constrained

This dynamic, often referred to as the “denominator effect,” Because private market valuations adjust more slowly than public markets, the relative weight of illiquid assets can rise unexpectedly.  This can leave institutions overallocated to illiquid assets and may force institutions to consider rebalancing at less favorable times.

A shift toward income-focused investing

The new regime calls for a recalibration of investment priorities. Rather than relying heavily on capital appreciation, portfolios must increasingly generate current income and stable cash flows.

This shift does not eliminate growth investing, but it requires a more balanced approach that integrates:

• Yield generation
• Capital preservation
• Downside risk management

Fundamental strategies for portfolio construction in higher interest rates

1. Emphasizing quality in equity allocations.

Not all equities perform equally in a higher-rate environment.

Companies with strong balance sheets, consistent earnings, and durable free cash flow are generally better positioned than speculative growth firms whose valuations depend on distant future earnings.

A quality-focused equity allocation can help:

• Enhance income through dividends
• Reduce volatility
• Improve downside resilience

2. Utilizing short-duration fixed income.

Fixed income is once again a meaningful contributor to portfolio returns.

In particular, short-duration fixed income offers:

• Competitive yields
• Lower sensitivity to interest rate changes
• Enhanced liquidity

This allows institutions to generate income while maintaining flexibility in uncertain rate environments.

3. Strengthening risk management and diversification.

Higher interest rates are one factor leading to greater market dispersion and less predictable correlations between asset classes.

As a result, portfolio diversification must go beyond traditional asset allocation. Investors should diversify across:

• Income vs. growth drivers
• Fixed vs. floating rate exposures
• Public vs. private markets
• Inflation-sensitive vs. nominal assets

At the same time, active risk management — including rebalancing and liquidity planning — becomes increasingly important.

Governance considerations for foundations

Portfolio adjustments alone are not sufficient. Endowments and foundations must also ensure that governance structures support evolving investment strategies.

Key considerations include:

• Revisiting return assumptions and spending policies
• Evaluating liquidity needs under stressed scenarios
• Maintaining disciplined investment committee oversight

In a higher-for-longer environment, strong governance is as critical as sound portfolio construction.

Adapting to a new investment regime

The transition to a higher interest rate environment represents more than a cyclical shift — it is a structural change that requires a reassessment of long-standing investment assumptions.

For endowments and foundations, success will depend on the ability to:

• Generate sustainable income
• Maintain diversification across evolving return drivers
• Manage risk and liquidity proactively

While the playbook is changing, the objective remains the same: supporting long-term missions through disciplined, thoughtful investment strategies.

Our Endowments & Foundations team is here to help. If you want guidance and a partner for your organization, contact us here.