Buying a home in Denmark comes with a long list of numbers to keep straight, and near the top of that list is the tax treatment of the money you borrow. For most homeowners, mortgage interest is one of the largest recurring costs they carry, so it is worth understanding exactly how the tax system helps lighten that burden. The Danish mortgage interest deduction, known as rentefradrag, does precisely that: it shaves the effective cost of borrowing by reducing the amount of taxable income you carry each year. It is not a complicated mechanism in itself, but it interacts with a wider set of property taxes and loan structures that are worth mapping out before you commit to a mortgage. This guide walks through how the deduction works, what the tax rates look like in practice, and how the different types of Danish mortgage loans and property taxes fit together.
What Is Rentefradrag?
Rentefradrag is a deduction for the interest you pay on mortgage loans that are secured by property. In effect, it lowers your taxable income by the amount of interest you have paid, which reduces the tax you owe and makes the interest cheaper on a net basis. The deduction applies to the two main ways Danes borrow against a home:
- Realkreditlån (mortgage bond loans), which typically carry lower interest rates
- Bank lån (bank loans), which are often used to finance part of the purchase
Both types qualify, provided the loan is secured against property in Denmark. Because the deduction acts directly on your taxable income, its size depends on the interest you actually pay in a given year.
How the Deduction Works
For 2026, the deduction rate is 25.6% of the interest paid. In plain terms, you get roughly 26 øre back for every krone of interest you pay. The deduction is applied against your municipal tax rate, which averages around 25% but varies by municipality.
The arithmetic is straightforward, as this example shows:
| Item | Amount |
|---|---|
| Mortgage amount | DKK 2,000,000 |
| Interest rate | 5% |
| Annual interest paid | DKK 100,000 |
| Deduction rate | 25.6% |
| Tax saving | DKK 25,600 |
On DKK 100,000 of interest, you save DKK 25,600 in tax, meaning you effectively pay DKK 74,400 once the benefit is counted (DKK 100,000 minus DKK 25,600). The same logic scales up with larger loans and higher interest.
Types of Mortgage Loans
Not all Danish mortgages are built the same way, and the differences matter more than many first-time buyers expect. The three main types are the mortgage bond loan, the bank loan, and the flexible loan.
Realkreditlån (Mortgage Bond Loan)
The realkreditlån is the workhorse of the Danish housing market. Interest rates are typically in the 3–5% range, repayment periods can stretch up to 30 years, and the loans are issued by specialised mortgage banks and backed by covered bonds (realkreditobligationer). Because they are secured against the property and backed by a well-established bond market, they tend to be the cheapest way to finance a purchase and are the most common choice for homebuyers.
Bank Lån (Bank Loan)
A bank lån works much as you would expect from any bank loan: interest rates are higher than on a realkreditlån, but the terms are more flexible. It is often used to cover part of the financing, typically 15–20% of the purchase price, on top of the realkreditlån. Under Danish rules, bank loans also qualify for rentefradrag, so the tax benefit is not limited to the bond-based part of your financing.
Prioritetslån (Flexible Loan)
The prioritetslån offers more flexible repayment terms and an interest rate that may vary over time. It can be renegotiated with the bank, which makes it a reasonable choice if you want the option to change how and when you repay. That flexibility tends to come at the cost of a less predictable monthly cost than a standard annuity loan.
Payment Types
Alongside the loan type, the payment structure shapes your cash flow. Two structures dominate in Denmark.
Annuetslån (Annuity Loan)
The annuity loan is the most common type in Denmark and offers fixed monthly payments that decrease over time. In the early years most of each payment goes to interest, while later payments go mostly to principal. The predictability makes it easy to budget around, and because the total payment is fixed rather than variable, it removes a great deal of uncertainty.
Afdragsfri (Interest-Only Periods)
An interest-only arrangement lets you skip principal payments for up to 10 years, paying only interest during that window. You still receive rentefradrag on the interest you pay, which can be genuinely useful if you are putting the money you would have used for principal elsewhere. The trade-off is important to appreciate: during an interest-only period your total debt stays high, and after 10 years you must start repaying principal. An interest-only period can make sense if you invest the difference to a good purpose, but you need to understand the total cost over the full life of the loan before choosing it.
Property Taxes
Beyond interest, Danish homeowners also meet two property taxes that are easy to overlook until they appear on a statement.
Ejendomsværdiskat (Property Value Tax)
The property value tax is an annual tax based on the assessed value of your property. For 2026, the rates are:
| Property Value (2026) | Tax Rate |
|---|---|
| Up to DKK 3,040,000 | 0.92% |
| Above DKK 3,040,000 | 3% |
There is also a main residence deduction of DKK 700,000, which is subtracted from the assessed value before the tax is applied.
Example: A property valued at DKK 3,500,000 with the main residence deduction falls to a taxable value of DKK 2,800,000, giving an annual tax of DKK 25,760 (DKK 2,800,000 times 0.92%).
Ejendomsavancebeskatning (Property Gain Tax)
The property gain tax applies to the profit you make when you sell:
| Property Type | Tax Treatment |
|---|---|
| Main residence | Tax-free if you lived there |
| Summer house | 42% on gain |
| Rental property | 42% on gain (with indexation for inflation) |
The main residence exemption is a significant benefit. If you sell your primary home and have actually lived there, the profit is generally tax-free, which is one of the most valuable tax rules a Danish homeowner will ever rely on.
Eligibility Rules
Qualifying for rentefradrag comes down to a handful of clear conditions. The property must be owner-occupied or a rental property, it must be located in Denmark, and the mortgage must come through an approved lender, whether a bank or a realkreditinstitut. The loan also has to be used for purchasing, improving, or maintaining the property, and you need documented interest payments.
Documentation and Reporting
For most borrowers, the administrative side is largely automatic: your mortgage provider reports your interest payments to SKAT via TastSelv. Even so, it is worth checking your tax return annually to make sure the figures are accurate, keeping your own records of interest payments, and reporting any discrepancies to SKAT if you spot an error. The deduction is typically applied automatically when you file, though you may need to add information manually if you have multiple mortgages or an unusually complex arrangement.
Worked Example: Couple Buying a DKK 4M Apartment
To bring it together, consider a couple buying an apartment for DKK 4,000,000 with a 20% down payment.
| Item | Calculation | Amount |
|---|---|---|
| Purchase price | DKK 4,000,000 | |
| Down payment (20%) | DKK 4,000,000 × 20% | DKK 800,000 |
| Mortgage | DKK 4,000,000 - DKK 800,000 | DKK 3,200,000 |
| Interest rate | 4% | |
| Annual interest paid | DKK 3,200,000 × 4% | DKK 128,000 |
| Deduction rate | 25.6% | |
| Tax saving | DKK 128,000 × 25.6% | DKK 32,768 |
Here the couple saves DKK 32,768 a year through rentefradrag, bringing their effective interest cost down to DKK 95,232 per year.
Thinking About Mortgage Strategy
There are a few habits that tend to keep mortgage costs under control. Comparing realkredit and bank loan rates is a good starting point: realkreditlån typically offers the lower rate, so many buyers split their financing at 80% realkredit and 20% bank loan, and compare total cost including fees and repayment terms. If you are tempted by an interest-only period, use it only with a clear investment strategy, calculate the total cost over the whole loan term, and remember that principal repayment resumes after 10 years.
It also pays to review your mortgage periodically to confirm it is still competitive, to consider refinancing if interest rates drop meaningfully, and to watch for any fees attached to changing your mortgage terms. On the property tax side, factor the annual tax into your budget, consider how changing property values affect your liability, and remember that for rental properties the property taxes are deductible expenses.
For more on the surrounding tax picture, see our property tax guide. If you are planning investments alongside your mortgage, our investing for beginners guide covers strategies that can complement your borrowing.
Wrapping Up
Rentefradrag is one of the most straightforward and valuable tax benefits available to Danish homeowners, quietly reducing the effective cost of every krone of interest you pay. The deduction rate for 2026 is 25.6%, the main residence exemption makes selling your primary home generally tax-free, and the property value tax sits at 0.92% up to DKK 3,040,000 and 3% above. The real skill is not in any single number but in how the pieces fit together: choosing the right loan type and payment structure, keeping an eye on property taxes, and understanding the long-term cost of choices like interest-only periods. Run a realistic example of your own, and you can see quickly how much a well-structured mortgage can save you over its lifetime.