Golden Rule (Finance)

The Golden Rule of Financing states that long-term assets should be financed by long-term capital and short-term assets by short-term capital-in other words, the maturity of the capital raised must match the maturity of the capital used. In the real estate sector, this means: A building with an economic useful life of 50 years should not be financed with a short-term loan, but rather with long-term loans (typically with a 15-30-year term) or equity. Mismatches in maturities are one of the most common causes of financial difficulties in real estate.

Application of the Golden Rule in Real Estate Financing

For private real estate buyers, the Golden Rule means specifically: The fixed-rate period should be as long as possible to minimize refinancing risk. Short-term fixed-rate periods (5 years) may offer more favorable initial terms, but expose the buyer to the risk of having to pay significantly higher interest rates upon refinancing. For commercial investors and project developers, the Golden Rule applies at the corporate level: No long-term project should be built on short-term credit lines.

A common mistake in practice is financing land or renovation projects through overdraft lines or short-term working capital loans. Such short-term financing methods are expensive and risky. Financing for land or renovations belongs in a long-term loan with a clear repayment structure-aligned with the property’s economic useful life.

The Golden Banking Rule and the Real Estate Industry

The Golden Rule of Banking (according to Otto Hübner, 1854) is a specific manifestation of this principle: Banks must not use short-term deposits for long-term loans. In the real estate lending business, this rule was circumvented through mortgage bonds: Banks refinance long-term mortgage loans with long-term mortgage bonds, thereby ensuring maturity matching. Conversely, for property owners, this means: The bank will only provide long-term financing for a property if the property offers sufficient collateral of lasting value.

Mortgage bonds are generally not a direct concern for private homebuyers, but they significantly shape the interest rate landscape. Mortgage bond issuances by the major mortgage banks play a key role in financing the German real estate market. During periods of high Pfandbrief yields, mortgage rates rise-a correlation that explains why construction loan rates rose so rapidly in 2022/23 and why maturity matching also pays off for borrowers.

Principal Repayment and Amortization as an Expression of the Golden Rule

The Golden Rule applies not only to the fixed-rate period but also to principal repayment. An initial principal repayment of just 1% on a 20-year loan results in an effective remaining term of well over 30 years-far longer than the fixed-rate period. This means: After the fixed-rate period expires, a significant portion of the loan remains outstanding, which must then be refinanced at the prevailing interest rates. A higher principal repayment-we recommend at least 2 to 3% initially-shortens the effective loan term and brings it closer to the spirit of the Golden Rule.

Special repayment options are also an important tool: they give the borrower the opportunity to make unscheduled repayments in the event of an unexpected inflow of capital (inheritance, bonus, rental income) and reduce the remaining debt. Most banks offer special repayments of 5 to 10% of the original loan amount per year without prepayment penalties.

Practical Tip for Homeowners in Nuremberg and Franconia

Given the current interest rate environment, we recommend that homebuyers in Nuremberg and the metropolitan region choose fixed-rate periods of at least 15 years while also agreeing to an initial repayment rate of at least 2%. This aligns with the spirit of the Golden Rule: The term of the financing is based on the economic life of the property, and the risk of interest rate resetting is reduced to a manageable level. Those structuring the purchase through a limited liability company (GmbH) should also ensure term matching at the operational level.

For investors in the metropolitan region who are financing multiple properties, a regular review of financing makes sense. When a loan matures, it is the right time for debt restructuring or improving terms. We recommend obtaining offers for follow-up financing (forward loans) no earlier than three years before the fixed-rate period expires and calculating various scenarios.

Frequently Asked Questions

Is the Golden Rule a legally mandated principle?

No. The Golden Rule of financing is a fundamental business principle, not a legal requirement. It serves as a guide for financing decisions and is used internally by lending institutions as a risk management tool.

What happens if the Golden Rule is violated?

Mismatched maturities create a refinancing risk: If interest rates rise during the follow-up financing, the property may become unprofitable. In the worst-case scenario, insolvency and foreclosure may result if the buyer cannot bear the increased interest burden.

Does the Golden Rule also apply to the purchase of condominiums for owner-occupancy?

Yes, term matching is also advisable for owner-occupiers. A home you plan to live in for 30 years should be financed with a loan that also covers a time horizon of 20-30 years. Short-term fixed-rate periods increase the risk of ending up with expensive follow-up financing, especially when life circumstances (e.g., job changes, family changes) are already creating pressure.

How much equity should I contribute when buying real estate?

As a rule of thumb: at least 20% of the purchase price plus ancillary costs (real estate transfer tax, notary fees, brokerage fees). In Nuremberg, with a real estate transfer tax of 3.5% and typical ancillary costs totaling around 8-10%, this means: Anyone buying a property for 400,000 euros should contribute at least 110,000 to 120,000 euros in equity. A higher equity share improves the terms and reduces the risk of over-indebtedness.

How does the Golden Rule affect the choice between a fixed-rate and a variable-rate mortgage?

The Golden Rule clearly favors a fixed-rate loan (fixed-rate mortgage) for real estate financing: A building is a long-term asset-it would violate the principle of maturity matching to finance it with a variable-rate loan whose interest rate is adjusted monthly or quarterly to market conditions. Variable interest rates may be cheaper in certain phases, but they carry the risk that interest rate hikes could jeopardize the viability of the financing. In the German real estate market, variable-rate loans are therefore rare and are primarily used only as bridge financing or for project developers with short holding periods. Fixed-rate terms of 15 to 20 years, supplemented by generous special repayment rights, best align with the spirit of the Golden Rule and are also issued by financing experts in the Nuremberg metropolitan region as the standard recommendation for owner-occupiers. For investors who hold multiple properties in their portfolio, a mix of different fixed-rate terms can smooth out the refinancing risk over time.

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