Net operating income, often referred to as NOI, is the amount remaining from total rental income after all operating expenses have been paid. When investing in NOI property, this key figure serves as the primary foundation for valuation, as it directly reflects the property's ability to generate profit independent of financing and tax.
What is NOI, and why is it crucial for Danish properties?
In professional real estate investment, Net Operating Income (NOI) is the most important management tool. It represents the cash flow generated by the property from its core business: leasing. To understand the value of NOI property, one must distinguish between gross income and actual profit before interest and depreciation.
In the Danish market, whether discussing growth areas like Copenhagen, Aarhus, or Odense, it is the NOI that dictates the exit yield (the capitalisation rate). A property's market value is typically calculated by dividing the NOI by the applicable market interest rate for the specific area and property type. Therefore, even small fluctuations in operating costs or rent levels have a direct and often amplified effect on the property's overall value.
It is important to note that NOI is an operational metric. This means that financial costs, such as interest on a prioritetslån (priority loan/mortgage) or bank debt, are not included. This allows investors to compare different properties across geographies and asset types on an objective basis, regardless of how the individual investor chooses to finance the purchase.
Calculating net operating income: From gross rent to operating profit
To arrive at the correct NOI, a thorough review of the property's finances must be conducted. The formula in its simplest form is:
Gross Rental Income – Operating Expenses = NOI
However, the complexity lies in what exactly is defined as operating expenses in a Danish context. Below are the typical elements included in the calculation:
The Income Side
- Base Rent: The contractual rent for residential or commercial space.
- Other Income: This can include income from parking, antenna space, laundry facilities, or storage room rentals.
- Vacancy Allowance: One should always include a realistic rate for structural vacancy, even if the property is fully let at the time of calculation.
The Expense Side
Operating expenses include the costs necessary to maintain the property's operation and condition:
- Property Taxes and Levies: Municipal grundskyld (land tax) and any dækningsafgift (property coverage tax on commercial buildings).
- Insurance: Building insurance, liability insurance, and any statutory workers' compensation insurance.
- Maintenance: Ongoing maintenance to keep the property in lettable condition. This should not be confused with improvements (CAPEX), which are value-adding investments.
- Administration: Fees for the administrator (property manager), lawyer, and accountant related to the property's operation.
- Caretaker and Cleaning: Expenses for stair cleaning, gardening, snow removal, and technical services.
- Utilities (where not reimbursed by the tenant): Electricity for common areas, water, and heating in vacant units.
| Element | Included in NOI? | Note |
|---|---|---|
| Rental Income | Yes | Actually collected rent |
| Property Tax | Yes | Varies by municipality |
| Caretaker | Yes | Operationally necessary expense |
| Interest Expenses | No | Relates to financing |
| Depreciation | No | Accounting entry |
| Corporate Tax | No | Individual to the investor |
How NOI affects valuation in different regions
Valuation of NOI property using the yield method (capitalisation method) is the most widely used model in Denmark. The market value is found using the formula: NOI / Yield Requirement = Value.
This means that geographical location plays a huge role in how one Pound or Krone of NOI is converted into value. In Copenhagen K, where risk is considered low and demand is high, the yield requirement can be significantly lower than in a provincial town in South Zealand or West Jutland.
Example: A property with an NOI of 1,000,000 DKK.
- At a yield requirement of 3% (e.g., central Copenhagen), the value is approx. 33.3 million DKK.
- At a yield requirement of 6% (e.g., a regional hub like Randers or Esbjerg), the value is approx. 16.6 million DKK.
As an investor, this means you must be particularly attentive to operational optimisation. If you can increase NOI by 50,000 DKK through energy savings or renegotiating service contracts, the property's value increases by over 1.6 million DKK in a 3% market. It is this gearing effect that makes the focus on net operating income so central for professional players.
Optimising net operating income: Strategies for value creation
When PropertyInvestments evaluates a property, we always look at the potential to optimise NOI. There are two main levers: increase income or reduce costs.
1. Income Optimisation
In Denmark, tenancy legislation is complex. For residential properties, the rent often depends on whether the property was built before or after 1991, and whether thorough modernisations have been carried out under the Lejeloven (Danish Rent Act) § 19, subs. 2 (formerly § 5, subs. 2). In commercial properties, there is greater freedom of contract, and here market rent clauses and indexations can be decisive for NOI growth.
An often-overlooked source of increased NOI is the optimisation of secondary areas. Can an unused attic space be converted into residential use? Can the basement be rented out for storage? Small steps can have a major impact on the total operating profit.
2. Cost Management
Operating costs can often be reduced without compromising the property's quality.
- Energy Renovation: By reducing consumption in common areas or installing more efficient heating systems, the operational burden falls.
- Renegotiation of Service Contracts: Professional investors often bundle their purchases of insurance, administration, and caretaker services to achieve economies of scale.
- Preventive Maintenance: By acting proactively rather than reactively, one can avoid expensive acute repairs that negatively impact the year's NOI.
Legal and tax considerations for NOI
It is important to emphasise that although NOI is an operational metric, the framework for generating this income is dictated by legislation. The Lejeloven (Rent Act) and Boligforholdskonsekvensloven (Housing Conditions Act) set the framework for how much rent can increase and which expenses can be passed on to tenants via the operating accounts.
For commercial leases, the Erhvervslejeloven (Business Rent Act) applies. Here, it is crucial to know whether the contracts are "net contracts" (where the tenant pays almost all operating expenses in addition to the rent) or "gross contracts" (where the landlord covers most expenses). The choice of type directly affects the risk and stability of your NOI.
Note: PropertyInvestments does not provide legal or tax advice. We always recommend that investors seek assistance from specialised lawyers and accountants to ensure compliance with current Danish rules, including specific requirements from SKAT (Danish Tax Agency) and the Ministry of Justice regarding property operation and leasing.
NOI vs. Cash Flow: Knowing the difference
A common mistake among new investors is confusing NOI with actual cash flow. While NOI speaks to the property's performance, cash flow speaks to the investor's return after financing.
To find cash flow before tax, debt service payments (interest and principal) are deducted from the NOI. In periods of rising interest rates, as seen in recent years, a property can have a healthy and stable NOI but a challenged cash flow if the loan-to-value ratio is too high or the loans are not fixed-rate. Therefore, an investment analysis should always include both an NOI calculation for property valuation and a cash flow analysis for investor liquidity.
Due Diligence: Verifying net operating income
When sourcing NOI property, financial due diligence is critical. One must never take the seller's stated NOI at face value without documentation.
The process should include:
- Review of Lease Agreements: Do the actual payments match the contracts? Are there tenant discounts or arrears?
- Validation of Operating Expenses: Reviewing invoices from the last 2-3 years to ensure maintenance hasn't been under-budgeted.
- Checking the Ejendomsskattebillet (Property Tax Bill): Municipal levies change, and one should always check the latest valuations and rates.
In cities like Roskilde, Kolding, or Aalborg, there may be local conditions, such as specific coverage taxes on commercial properties, that must be factored into your calculations.
Market trends in 2026: NOI in a changing market
As of September 2026, investors have an increased focus on the robustness of NOI. With the fluctuations in energy prices and inflation the market has experienced, lease agreements with solid indexation (e.g., Nettoprisindeks (Net Price Index)) have become more desirable. At the same time, we see a tendency for properties with a high ESG score (Environmental, Social, and Governance) to achieve a more stable NOI, as they are cheaper to operate and more attractive to tenants, reducing vacancy risk.
Investing in NOI property in 2026 is therefore largely about data-driven insight. The more accurately you can estimate and manage your net operating income, the more secure the investment in a Danish property market that continues to be characterised by professionalisation and demands for transparency.
Frequently asked questions
What is a good NOI for an investment property?
There isn't a single "good" number. NOI must be seen in relation to the purchase price (the yield). A high NOI on an expensively purchased property may yield a worse return than a lower NOI on a cheap property. What matters is the stability and growth potential of the net operating income.
Why is interest not included in NOI?
NOI measures the property's fundamental operational ability independent of the owner. By excluding interest, one can compare properties directly, regardless of whether a buyer is self-financing or borrowing 80% of the purchase price.
Can NOI be negative?
Yes, if operating costs exceed rental income – for example, due to high vacancy or large unforeseen maintenance needs – the NOI will be negative. This typically indicates a property with significant challenges or a development project.
How does vacancy affect my NOI?
Vacancy directly reduces gross rental income and is one of the greatest risks to NOI. Professional investors typically include a tomgangsfradrag (vacancy allowance) of 2-5% in their budgets to account for tenant turnover.
How PropertyInvestments can help
Since 1985, PropertyInvestments has assisted Danish and international investors in navigating the Danish real estate market. We source and analyse investment cases with a sharp focus on Net Operating Income as the value marker.
Our services include:
- Sourcing investment properties throughout Denmark.
- Review and optimisation of the property's operating budget.
- Preparing properties for sale to maximise value through NOI optimisation.
- Strategic advice on portfolio composition.
If you are seeking advice on investing in NOI property or want a professional evaluation of your current portfolio, please feel free to contact us at info@propertyinvestments.dk or by phone at +45 31 16 31 00 for a non-binding dialogue.
