Rebalancing When Cash Yields Remain Relevant: A Framework for 2025

Introduction

As of February 2025, cash yields remain at levels that were once considered extraordinary. Short-term interest rates in the US, for instance, are still above 4%, a stark contrast to the near-zero environment that prevailed for much of the post-2008 era. This persistence of attractive cash returns has important implications for portfolio rebalancing. Traditional rebalancing frameworks often treat cash as a residual or a drag, but in the current context, cash can be a meaningful source of return and optionality. This note sets out a rebalancing framework that accounts for the continued relevance of cash yields, while navigating the uncertain inflation and policy landscape.

Market and Context

Markets entered 2025 with a cautious tone. After a period of aggressive rate hikes followed by a pause, central banks were assessing whether the progress on inflation was durable enough to allow for easier policy. In the US, the Federal Reserve had held rates steady since mid-2024, and the data on core PCE inflation remained above target, albeit trending lower. The labor market showed signs of cooling but was not yet weak enough to trigger a pivot. Meanwhile, fiscal policy remained a wildcard, with debates over spending and tax cuts ahead of the 2026 midterm elections. Trade policy under the new administration was also a source of uncertainty, with tariff announcements affecting specific sectors and currencies. In this environment, cash offered a rare combination of safety and yield, making it a legitimate asset class rather than just a temporary parking spot.

Main Analysis: Rebalancing with Cash as a Strategic Asset

The traditional approach to rebalancing involves periodically adjusting portfolio weights back to a target allocation, typically by selling assets that have appreciated and buying those that have lagged. The rationale is to maintain a consistent risk profile and to capture mean-reversion. However, when cash yields are competitive, the opportunity cost of holding cash is lower, and the potential benefit of deploying cash into risk assets must be weighed against the certainty of cash returns.

Threshold-Based Rebalancing

Given the uncertainty around inflation and policy, we advocate for a threshold-based rebalancing approach rather than a calendar-based one. Under this framework, rebalancing is triggered only when an asset class deviates from its target by a predefined percentage (e.g., 5%). This allows portfolios to drift within a range, reducing transaction costs and avoiding overtrading. In the current environment, where volatility may be elevated due to policy surprises, wider bands (e.g., 10%) could be appropriate. This ensures that rebalancing occurs only when deviations are significant enough to justify the risk of moving out of cash.

Cash as a Buffer and a Source of Return

Cash should not be viewed merely as a residual. With yields above 4%, cash can contribute meaningfully to total portfolio return. In a balanced portfolio with a 60/40 equity/bond split, a 5% cash allocation yielding 4.5% adds roughly 0.23% to overall return, not accounting for the optionality it provides. More importantly, cash acts as a buffer during drawdowns, allowing investors to rebalance into risk assets without having to sell at depressed prices. This is particularly valuable in an environment where equity valuations, especially in the technology sector, are elevated by historical standards.

Sector and Currency Considerations

Rebalancing decisions must also account for sector and currency exposures. US equity markets have been dominated by technology and AI-related stocks, which have driven a significant portion of returns. However, concentration risk is a concern. Rebalancing out of overvalued tech into other sectors (e.g., healthcare, energy, or financials) can be prudent, but only if those sectors offer attractive risk/reward. Similarly, currency positioning matters: a strong US dollar has been a headwind for international returns. Cash held in foreign currencies may offer higher yields but also carries exchange rate risk. A disciplined rebalancing process should incorporate these dimensions, adjusting not just overall equity exposure but also regional and sector tilts.

Dynamic vs. Static Targets

We recommend a dynamic approach to target allocations. For example, if inflation proves stickier than expected, the optimal equity allocation might be lower than in a disinflationary scenario. Similarly, if trade tensions escalate, reducing exposure to export-oriented sectors and increasing cash may be warranted. Rather than setting fixed targets, investors can define a range of acceptable allocations based on macro scenarios. Rebalancing then occurs when the portfolio moves outside the scenario-consistent range. This adds complexity but aligns the portfolio with the prevailing risk environment.

Implications for Investors

For institutional investors and high-net-worth individuals, the key implication is that cash should be integrated into the strategic asset allocation, not treated as a tactical afterthought. This means setting a minimum cash allocation (e.g., 5-10%) and rebalancing around that target. For retail investors, the message is simpler: do not be in a hurry to deploy cash into risk assets if the risk-adjusted return of cash is competitive. Patience can be rewarded if opportunities arise from market dislocations.

Another implication is the need for tax-aware rebalancing. In taxable accounts, realizing capital gains to rebalance can be costly. Cash holdings can be used to absorb inflows or to meet withdrawal needs without forcing sales. This is especially relevant when cash yields are high enough to cover spending needs partially.

Risks to Watch

Several risks could upend the rebalancing framework outlined above. First, if inflation reaccelerates, central banks may be forced to hike rates further, causing bond prices to fall and equity valuations to compress. In that scenario, cash would become even more attractive, but the opportunity cost of holding cash would also rise as risk assets become cheaper. Second, a recession could trigger a flight to safety, pushing cash yields lower as central banks cut rates. In that case, the relative appeal of cash would diminish, and investors would want to deploy cash into bonds and defensive equities. Third, policy errors—whether fiscal, trade, or regulatory—could create tail risks that are hard to model. In such environments, holding cash provides the flexibility to respond quickly.

Closing

As of February 2025, cash yields remain a relevant and attractive component of portfolio construction. Rebalancing strategies should reflect this reality, using threshold-based approaches that allow for drift while maintaining discipline. The uncertain inflation and policy backdrop argues for a flexible, scenario-aware framework that treats cash as a strategic asset rather than a temporary holding pen. By doing so, investors can capture the return and optionality that cash provides, while staying prepared to deploy capital when risk assets offer compelling opportunities. The key is to remain disciplined, avoid timing the market, and let the rebalancing process guide decisions.