Gradual reduction of interest-only exposure on bank balance sheets
Public disclosures indicate that several Dutch banks have already shown a gradual decline in the share of interest-only mortgages on their balance sheets over recent years. This development could be attributed to the has taken place within a supervisory environment shaped by the ECB and DNB, where increased attention to lifecycle management and maturity risks has influenced lender behaviour over time.
In practice, however, the observed decline appears to reflect stricter underwriting criteria, increased use of NHG mortgages and fiscal changes that have reduced demand for interest-only structures. Pricing adjustments may have contributed at the margin, but the overall trend mainly reflects gradual shifts in product mix and borrower behaviour rather than a supply-driven reduction.
|
Banks
|
2023
|
2024
|
2025
|
|
Rabobank
|
50%
|
↓49%
|
↓48%
|
|
ABN AMRO
|
42%
|
↓39%
|
↓37%
|
|
ASN
|
45%
|
↓42%
|
↓40%
|
|
Achmea Bank
|
40%
|
↓34%
|
|
Figure 6: Interest-only mortgage share on selected Dutch bank balance sheets, 2023–2025 (Source: Bank disclosures)
Concrete tightening in product design
A further concrete market signal of this transition has emerged through recent product policy adjustments. Rabobank has recently announced a significant tightening of its interest-only mortgage lending policy, reducing the maximum interest-only component in new mortgages to 30% and introducing an absolute cap of EUR 150,000. This move represents a clear step beyond earlier pricing adjustments and gradual portfolio developments, and effectively establishes an initial reference point within the Dutch banking market.
Given the shared supervisory framework and comparable balance sheet dynamics among the Dutch large banks, it is expected that other major banks will reassess their own interest-only limits over time. Smaller banks, which also fall under DNB supervision and are currently entering a more intensive implementation phase, may subsequently review their interest-only policies as supervisory expectations continue to be translated into practice.
Diverging responses between bank and non-bank lenders
At the same time, this development should not be interpreted as a fixed or uniform outcome for the broader mortgage market. Product design decisions remain influenced by portfolio preferences, and different regulatory and supervisory constraints, meaning that outcomes can differ across lenders and do not necessarily imply a single market-wide direction for interest-only lending.
Non-bank lenders are not subject to banking supervision, but operate within the same Dutch mortgage lending framework as banks, including the Temporary Mortgage Credit Regulations (TRHK) and the Code of Conduct for Mortgage Lending (Gedragscode Hypothecaire Financieringen, GHF). These standards focus on borrower affordability and sustainability over the life of the loan. Where an interest-only structure meets these criteria, additional restrictions are not required purely for portfolio-level considerations.
Institutional investors such as pension funds and insurance companies invest directly in Dutch residential mortgages through non-bank lenders. Interest-only pricing at non-bank lenders has therefore also adjusted in recent periods. These adjustments are aimed at maintaining a balanced production mix rather than reducing interest-only lending altogether.
Implications for consumers: refinancing capacity, mobility and policy-driven frictions
While supervisory measures primarily target long-dated portfolio risks at lender level, their effects ultimately appear at borrower level. The tightening of interest-only policies does not create immediate payment stress, but mainly reduces flexibility at moments when mortgage structures need to be adjusted.
Who is affected and when the impact materialises
The impact is mainly concentrated among households with existing interest-only exposure that need to refinance or adjust their mortgage, for example when moving home, following a divorce or separation, or at the end of a fixed-rate period. This mainly concerns owner-occupiers with legacy interest-only components, often within mixed mortgage structures. First-time buyers are largely unaffected, as they predominantly use amortising mortgages and NHG-backed loans do not include interest-only structures.
Within the existing borrower population, effects differ. Households with substantial housing equity or savings generally retain sufficient flexibility to adjust. Borrowers with limited buffers or a stronger reliance on interest-only structures for cash-flow management may face tighter constraints when refinancing.
Importantly, these effects do not arise during the ongoing loan term. They become relevant only at refinancing or life-cycle moments, when borrowers are assessed under current lending standards rather than historical conditions. A lower permissible interest-only share can then require a larger amortising component, even when the total loan balance remains unchanged.
Higher payments without higher debt
The main mechanism is a shift in repayment structure rather than increased leverage. Lower interest-only caps can raise monthly payments because a larger share of the mortgage must amortise. Refinancing capacity may therefore decline due to product design rather than new borrowing. In practice, some households may fall outside affordability thresholds despite stable loan balances.
Mobility, retirement and borrower outcomes
Tighter interest-only limits can also influence housing mobility. Borrowers moving home may no longer replicate the repayment structure of their existing mortgage, which can reduce borrowing capacity or delay relocation decisions.
Interest-only mortgages are more common among older borrower groups. Around retirement, refinancing assessments become more conservative as income declines, while product limits may require a higher amortising share. Constraints in these cases reflect the interaction between affordability testing and product rules rather than underlying credit deterioration.
For a smaller group of borrowers with limited buffers, tighter caps may lead to difficult choices such as higher amortisation or postponed mobility. These outcomes should be seen as tail risks rather than base-case scenarios.
Policy interaction
Recent product adjustments, including explicit caps on interest-only shares, illustrate how supervisory expectations increasingly translate into concrete lending policies. While affordability rules under the TRHK aim to prevent overextension, their interaction with tighter product limits can create frictions at refinancing moments. Balancing portfolio risk management with borrower flexibility will therefore remain an ongoing consideration as these developments evolve.
Looking ahead: monitoring a shifting landscape
The outlook for interest-only mortgages remains dynamic. The regulatory topic continues to evolve, but the overall direction is becoming clearer, with smaller banks gradually moving in line with earlier adjustments by larger institutions. Alongside pricing changes, some banks have begun tightening product design, including explicit limits on interest-only components, reflecting supervisory expectations and capital requirements.
The market appears to be moving towards a new equilibrium, where higher interest-only spreads increasingly reflects the tighter supervisory stance on banks. If spreads remain structurally higher, interest-only lending may continue to be economically attractive within revised balance sheet frameworks, potentially supporting renewed lender interest over time. Non-bank lenders are more likely to respond primarily through pricing rather than structural product restrictions.