# NOI (Net Operating Income)

> Property income after operating expenses but before debt service

Canonical: https://www.investbud.de/en/glossary/noi
Last updated: 2026-10-28

NOI (Net Operating Income) equals gross rental income minus the expenses the owner bears (non-recoverable Hausgeld, maintenance reserves, property management, vacancy), but before mortgage payments. NOI is used to calculate cap rates and assess property performance independently of financing. In Germany, proper NOI calculation must account for non-recoverable Hausgeld portions.

Gross rent €18,000 − non-recoverable Hausgeld €3,600 − vacancy 3% €540 − maintenance €1,000 = NOI €12,860.

Net Operating Income (NOI) is a fundamental property performance metric that measures the income a property generates from operations, independent of how it is financed. In the German real estate context, accurately calculating NOI requires a nuanced understanding of the local cost structure, particularly the split between recoverable and non-recoverable expenses within the Hausgeld system.

Practical Example: Detailed NOI Calculation for a German Apartment: You own a 75m² apartment in Frankfurt. Monthly Kaltmiete: €1,100. Annual Gross Potential Rent: €13,200. Vacancy allowance (assumed 3%): −€396. Effective Gross Income: €12,804. Annual non-recoverable expenses: Instandhaltungsrücklage (building reserves): €1,080 (€90/month). Hausverwaltung fee: €420 (€35/month). Non-recoverable insurance and misc: €180. Unit-specific maintenance reserve: €1,500 (budgeted by owner). Total non-recoverable expenses: €3,180. NOI = €12,804 − €3,180 = €9,624. If the property was purchased for €280,000, the Cap Rate is: €9,624 ÷ €280,000 = 3.44%. Note: The total Hausgeld may be €350/month (€4,200/year), of which €1,680 (reserve, management, misc) is non-recoverable. The remaining €2,520 is recovered from the tenant through the Nebenkostenabrechnung. The €1,500 unit reserve is your own budget on top of the Hausgeld.

## How to Calculate NOI for German Investment Properties

The NOI calculation starts with gross potential rental income and subtracts all operating expenses related to the property, excluding debt service (mortgage payments) and income taxes. This financing-neutral metric allows investors to evaluate and compare properties purely on their operational merits. In Germany, the main challenge in calculating NOI accurately is properly categorizing which Hausgeld components are recoverable from tenants (Umlagefähige Nebenkosten) and which are borne by the owner.

- Step 1: Determine Gross Potential Rent (GPR): the total rent if the property were 100% occupied at market rates
- Step 2: Subtract a vacancy and credit loss allowance (for rent-controlled social housing, § 29 II. BV caps this Mietausfallwagnis at 2% of income)
- Step 3: The result is Effective Gross Income (EGI)
- Step 4: Subtract non-recoverable Hausgeld components: Instandhaltungsrücklage, Hausverwaltung fees, owner's insurance share
- Step 5: Subtract unit-specific maintenance reserve (beyond building reserves)
- Step 6: Subtract property management fees if using external management
- Step 7: The result is your Net Operating Income (NOI)

## Recoverable vs. Non-Recoverable Expenses in the German System

One of the most common mistakes investors make when analyzing German properties is failing to distinguish between costs that can be passed on to tenants and those that must be borne by the owner. The Betriebskostenverordnung (BetrKV) defines which operating costs are legally recoverable from tenants, and it excludes management and maintenance costs (§ 1 (2) BetrKV). Understanding this distinction is critical for accurate NOI calculation and realistic financial projections.

- Recoverable (Umlagefähig): Water/sewage, heating, garbage collection, building cleaning, chimney sweep, lighting of common areas, property tax (Grundsteuer), building and liability insurance, garden maintenance, elevator operation
- Non-recoverable (Nicht umlagefähig): Instandhaltungsrücklage (maintenance reserves), Hausverwaltung fees (property management), repair costs, owner's legal expenses, bank fees
- Always verify the Wirtschaftsplan (annual budget) and Hausgeldabrechnung (annual settlement) to understand the exact cost breakdown

## Using NOI for Investment Analysis and Comparison

NOI is the building block for several important investment metrics and valuation approaches. Its financing-neutral nature makes it the preferred income measure for professional investors and analysts comparing properties across different financing structures, locations, and property types.

- Cap Rate calculation: NOI ÷ Property Value = Cap Rate (the most common use of NOI)
- Property valuation: NOI ÷ Market Cap Rate = Estimated Property Value (direct capitalization)
- Debt Service Coverage Ratio (DSCR): NOI ÷ Annual Debt Service; above 1, NOI covers the loan payments
- NOI margin: NOI ÷ Gross Rent = Operating efficiency (higher is better)
- Year-over-year NOI growth tracking to assess property performance trends

## Practical Tips

- Always request the Wirtschaftsplan (annual budget plan) and the last 2 to 3 years of Hausgeldabrechnungen (annual Hausgeld settlements) before purchasing, as these documents reveal the true non-recoverable cost structure and whether the building's reserves are adequately funded.
- Build a standardized NOI template that you use consistently across all property analyses to ensure apples-to-apples comparison. Include a line item for unit-specific maintenance reserve even if the building's Instandhaltungsrücklage seems adequate, as individual unit expenses are your responsibility.

## Frequently Asked Questions

### Does NOI include Grundsteuer (property tax) as an expense?

In the German system, Grundsteuer is recoverable from tenants as an operating cost (Umlagefähige Nebenkosten) under the Betriebskostenverordnung (§ 2 No. 1 BetrKV), provided the lease passes operating costs on to the tenant. In that case it should NOT be deducted when calculating NOI, since it does not represent an expense borne by the owner. However, there is a caveat: some international NOI standards deduct property tax from gross income. When comparing German properties with international investments, clarify which convention is being used to ensure consistency.

### How is NOI different from cashflow?

NOI and cashflow are related but quite different metrics. NOI measures the property's operational income before debt service (mortgage payments) and income taxes; it is financing-neutral. Cashflow includes debt service, making it specific to your financing structure. Two investors owning the same property with the same NOI will have different cashflow depending on their mortgage terms. NOI tells you how well the property performs operationally; cashflow tells you how much money actually flows into or out of your pocket each month. Both metrics are important: NOI for property evaluation and comparison, cashflow for personal financial planning.

### What NOI should I expect for a typical German apartment investment?

There is no reliable standard figure, so calculate it for each property. A useful way to express it is the NOI margin (NOI as a percentage of gross rent): in the Frankfurt example above it is €9,624 ÷ €13,200 = 73%. The margin depends on the property's Hausgeld structure, age, condition, and location. Newer buildings with lower maintenance costs and efficient management tend to have higher NOI margins. Properties in Wohnungseigentümergemeinschaften (WEG) with high Instandhaltungsrücklagen or pending Sanierungen (renovations) will have lower margins. Always project NOI conservatively and account for potential cost increases.