Why Private Insurance Builds Aging Reserves — and Public Insurance Does Not

Two Different Financing Philosophies

Germany’s two health systems operate on fundamentally different financial principles.

Public insurance → pay-as-you-go redistribution.

Private insurance → capital-funded actuarial calculation.

---

What Aging Reserves Are

In private health insurance, part of every premium is not used immediately.

Instead, it is saved as a capital reserve.

This reserve is called:

Altersrückstellung (aging reserve).

Its purpose is to smooth premium development later in life.

---

Why Medical Costs Rise With Age

Healthcare costs increase significantly over time.

Typical spending distribution:

• Early adulthood: low
• Middle age: moderate
• Retirement: highest

Without reserves, premiums would rise dramatically in later years.

---

The Capital Accumulation Model

Private insurers therefore build a financial buffer during earlier years.

In simplified form:

Premium
  ↓
Current Medical Cost
  ↓
Reserve Accumulation

These reserves are invested and accumulate over decades.

---

Why the Public System Does Not Build Reserves

The statutory system operates differently.

Current contributions finance current expenditures.

This means:

• No personal capital accumulation
• Future costs depend on future contributors

The model relies on intergenerational solidarity.

---

Long-Term Implications

Both systems reflect different policy philosophies:

Public system → collective redistribution.

Private system → actuarial long-term financing.

Understanding this distinction is essential when evaluating the long-term dynamics of health insurance contributions.