Why Rate Sensitivity & Core Deposit Studies Matter More Than Ever

By AIM CU Solutions & Millennium Corporate Credit Union

Over the past year, the interest rate environment has continued to challenge traditional deposit assumptions. After a prolonged period of rapid rate increases, and now a landscape marked by uncertainty around future rate movements, credit unions are reassessing how deposits truly behave.

Liquidity pressures, increased competition for deposits, and evolving member expectations have made one thing clear: historical assumptions alone are no longer enough. Updated rate sensitivity and core deposit studies provide the clarity needed to make confident, defensible decisions in Asset Liability Management (ALM).

Moving Beyond Assumptions

Many ALM models rely on deposit betas and decay assumptions built during very different rate cycles, but member behavior changes. Digital banking expands options. Competitive pricing shifts faster than ever.

A refreshed rate sensitivity study allows your credit union to:

• Validate or recalibrate deposit betas
• Understand pricing elasticity across account types
• Measure migration trends between products
• Better quantify true core versus rate-sensitive funds

When paired with a core deposit study, the result is a stronger foundation for both strategic planning and regulatory discussions.

Strengthening ALM & IRR Management

Accurate data drives effective balance sheet management. A comprehensive rate sensitivity analysis helps credit unions:

• Evaluate earnings and capital sensitivity under multiple rate environments
• Assess potential margin compression or expansion
• Stress test liquidity under changing member behaviors
• Enhance board-level reporting with defensible analytics

Rather than reacting to rate movements, credit unions can proactively position the balance sheet.

Supporting Regulatory Expectations

Examiners continue to focus on liquidity risk, interest rate risk (IRR), and assumptions. Updated deposit studies demonstrate that your credit union:

• Actively monitors and validates key ALM assumptions
• Aligns modeling inputs with real member behavior
• Maintains prudent risk management practices

Clear documentation and independent analysis help support confident conversations with regulators.

Driving Strategic Decisions

Beyond compliance, these studies directly inform day-to-day decision-making including:

• Deposit pricing strategy
• Promotional campaign structure
• Loan growth pacing
• Investment portfolio positioning

With better visibility into deposit stability and rate sensitivity, leadership teams can act with greater precision - protecting margin while remaining competitive for members.

Delivering Long-Term Member Value

Ultimately, strong balance sheet management supports what matters most - your members. When rate risk is well managed and liquidity is sound, credit unions can continue offering competitive products, stable earnings, and sustainable growth.

The Asset & Investment Management (AIM) team at Millennium Corporate Credit Union provides comprehensive rate sensitivity analyses and core deposit studies tailored to your institution’s unique balance sheet and member base.

If you’re interested in updating your assumptions or strengthening your ALM framework, connect with an AIM team member at aim@aimcusolutions.org or call 855.882.8474.

ABOUT MILLENNIUM CORP
For over 70 years, we have been deeply rooted in the credit union system as your preferred cooperative partner for financial services. Our dedication runs deep, just as our commitment to promoting credit union prosperity through offering the services you need to continue to serve your ever-changing communities.