Investment Property Mortgage: Negotiate the Best Terms
When Sandra told her regular bank she wanted to buy an apartment to rent out, the tone of the conversation changed immediately. The advisor, who had enthusiastically arranged a mortgage for her own condo just two years earlier, suddenly became reserved. "An investment property is something entirely different," he said. "Different rules apply." Then came terms like "higher equity requirements," "risk premium," and "imputed affordability of rental income." Sandra left the bank with more questions than answers.
What Sandra experienced that day is not an isolated case. Banks fundamentally treat investment properties differently from owner-occupied homes. The requirements are stricter, the interest rates higher, and the rules more complex. But if you know these rules, you can still negotiate good terms.
Why Banks Are Stricter with Investment Properties
To understand the negotiation, you first need to understand how the bank thinks. With an owner-occupied home, the bank has a dual security: the property as collateral and your personal income for affordability. You live in the property, so you will do everything to service the mortgage.
With an investment property, the equation looks different. Your income from the rental is uncertain (vacancy, rental defaults), and you have less emotional attachment to the property. In the worst case, you simply hand back the keys. The risk for the bank is therefore higher, and it compensates with stricter conditions.
The Three Biggest Differences
1. Higher equity requirement: 25% instead of 20%
For owner-occupied property, banks require at least 20% equity, of which 10% may come from the pension fund. For investment properties, it is at least 25%, and pension fund assets are not permitted. This means: for a purchase price of CHF 800'000, you need at least CHF 200'000 in cash or from pillar 3a.
Some banks require even 30% or more, particularly for:
- Properties in peripheral locations
- Older buildings with renovation needs
- First-time investors without a track record
- High overall debt levels of the buyer
2. Higher imputed interest rate
For the affordability calculation, banks do not use the current market rate but an imputed interest rate. For owner-occupied homes, this is 4.5 to 5%. For investment properties, some banks calculate with 5 to 5.5%. This sounds like a small difference but has a significant impact on affordability.
How the bank calculates affordability and what you can do when it is tight is covered in our detailed article on affordability for investment properties.
3. Rental income is only partially credited
The bank does not include 100% of your rental income in the affordability calculation. Typically, only 70 to 80% of gross rental income is credited. The 20 to 30% discount covers the risk of vacancy, ancillary costs, and maintenance.
In concrete terms: if your apartment generates CHF 24'000 in annual rental income, the bank only counts CHF 16'800 to CHF 19'200. You need to be able to cover the rest from your regular income.
You can check whether your property meets the affordability criteria in advance with the immometrics affordability calculator.
Interest Rate Premiums in Detail
Beyond the stricter lending criteria, you also pay a higher interest rate on an investment property. The premium varies by bank and risk profile.
Typical interest rate premiums (as of 2026):
| Mortgage type | Owner-occupied | Investment property | Premium |
|---|---|---|---|
| SARON (variable) | 1.20% | 1.45-1.65% | +0.25-0.45% |
| Fixed-rate 5 years | 1.55% | 1.80-2.05% | +0.25-0.50% |
| Fixed-rate 10 years | 1.85% | 2.15-2.45% | +0.30-0.60% |
On a mortgage of CHF 600'000, a premium of 0.40% means additional annual costs of CHF 2'400. Over a 10-year term, that is CHF 24'000. That is exactly why negotiating pays off.
Strategy 1: Get Multiple Offers
The most important rule in mortgage negotiation applies even more strongly to investment properties than to owner-occupied homes: never get just one offer.
Get at least three to five quotes from:
- Your regular bank: Has the advantage that they know you. Has the disadvantage that they feel secure and have little pressure to make a good offer.
- A cantonal bank: Cantonal banks often have competitive conditions for properties in their canton. Zuercher Kantonalbank, Berner Kantonalbank, or Aargauische Kantonalbank are frequently competitive on investment properties.
- A major bank: UBS and Raiffeisen have specialised departments for investment properties with standardised processes.
- An insurer: Swiss Life, Helvetia, Zurich, and Allianz also issue mortgages. Their conditions are often very attractive, especially for longer terms. Insurers are less flexible with amortisation but sometimes offer lower interest rates.
- A mortgage broker: Platforms like Moneypark, Hypoguide, or VZ Hypothekenvergleich compare dozens of providers and can negotiate conditions that you would not get as an individual.
Sandra's experience: Her regular bank offered 2.05% for a 5-year fixed-rate mortgage. After four more quotes, the best offer was 1.72% from an insurer. That is 0.33 percentage points difference. On a CHF 600'000 mortgage: CHF 1'980 per year, CHF 9'900 over 5 years.
Strategy 2: Put Together a Convincing Dossier
Banks make their decisions based on numbers. The better you present these numbers, the lower the bank assesses the risk, and the better the conditions become.
Your dossier should include:
About You
- Current tax return (last 2-3 years)
- Salary statement or annual accounts if self-employed
- Proof of assets (bank statements, portfolio statements)
- Existing mortgages and obligations
- If available: proof of previous real estate investments
About the Property
- Land registry extract
- Building insurance certificate
- Current leases with rent history
- Ancillary cost statements from the last 2 years
- Photos and description of the property
- Condition report or GEAK (building energy certificate)
About the Calculation
- Complete income statement (rental income less all costs)
- Cashflow forecast over 10 years
- Affordability calculation with different interest rate scenarios
- Market rent analysis (comparison with similar properties)
This dossier shows the bank that you are a professional investor, not a hobby landlord. That lowers the perceived risk and improves your negotiating position.
Tip: You can calculate the cashflow and affordability with the immometrics calculator and the affordability calculator and use them as part of your dossier.
Strategy 3: Leverage Existing Relationships
If you already have a mortgage at a bank, you are an existing customer. That is an advantage you should actively use.
How to leverage the relationship:
- Mention your total engagement: mortgage, savings account, pension, securities portfolio. The bank earns from the overall relationship, not just the mortgage.
- Negotiate a package deal: "I will also bring my pillar 3a account and my portfolio to you if the mortgage conditions are right."
- Speak to the team leader, not the counter advisor. Decision-makers have more flexibility on conditions.
- Timing: bank advisors have quarterly targets. At the end of the quarter (March, June, September, December), they are often willing to offer better terms to reach their volume targets.
However: Do not let the relationship blind you. Loyalty is good, but not at the cost of CHF 2'000 per year. If another bank is 0.3 percentage points cheaper, tell your regular bank and give them the chance to match.
Strategy 4: Choose the Right Mortgage Strategy
The choice between a SARON mortgage and a fixed-rate mortgage is particularly important for investment properties because the interest rates directly affect your cashflow and therefore your return.
SARON Mortgage (variable)
Advantages:
- Currently the lowest interest rate
- No termination penalty (cancellable quarterly)
- Benefits from falling interest rates
Disadvantages:
- Interest rate risk directly impacts cashflow
- More difficult to plan long-term returns
- Bank can adjust the margin surcharge
Fixed-Rate Mortgage (2-10 years)
Advantages:
- Predictable costs over the entire term
- Protection against rising interest rates
- Simpler cashflow calculation
Disadvantages:
- Higher interest rate than SARON
- Early termination penalty if cancelled prematurely
- No benefit from falling interest rates
The Mix Strategy
Many experienced real estate investors combine both models. Example with a CHF 600'000 mortgage:
- CHF 350'000 as fixed-rate (7 years): Secures the base cashflow.
- CHF 250'000 as SARON: Benefits from low interest rates and can be converted to a fixed-rate mortgage if rates rise.
The advantage of this strategy: you diversify your interest rate risk. Not all eggs in one basket, including when it comes to financing.
Important: Make sure the terms of the tranches do not expire simultaneously. If both tranches need renewal in the same year, you have concentration risk. Better: Tranche 1 for 5 years, Tranche 2 for 8 years.
Strategy 5: Explore Alternative Financing Sources
Beyond traditional bank mortgages, there are other financing sources that can be attractive for investment properties.
Insurers and Pension Funds as Lenders
Insurers like Swiss Life, Helvetia, or Zurich issue mortgages directly. Their conditions for long terms (8-15 years) are often more favourable than banks because they want to invest money long-term. Some large pension funds also issue mortgages to their insured members.
Advantages:
- Often lower interest rates for long terms
- Stable conditions, less aggressive margin increases
- Some offer special terms for energy-efficient properties
Disadvantages:
- Less flexible with special repayments
- Longer processing times
- Often only for larger mortgage volumes (from CHF 300'000)
Pillar 3a as Equity
You can use pillar 3a assets for the purchase of an investment property, but only as equity, not as a mortgage. The withdrawn capital is taxed at a reduced rate. Check whether the tax advantage of pillar 3a outweighs the withdrawal tax.
Optimising Amortisation Models
For investment properties, you must amortise the mortgage to two-thirds of the lending value within 15 years (indirect amortisation via pillar 3a is possible). The type of amortisation affects your cashflow:
- Direct amortisation: You pay down the mortgage directly. The debt decreases, and so does the interest burden, but you lose the tax deduction on mortgage interest.
- Indirect amortisation via pillar 3a: You pay into pillar 3a and pledge it to the bank. The mortgage stays at the same level, you keep the full mortgage interest deduction, and the pillar 3a contributions are also tax-deductible. A double tax benefit.
Sandra's Result
Sandra applied all five strategies. After six weeks of intensive research and negotiation, her result looked like this:
- Purchase price of the apartment: CHF 780'000
- Equity: CHF 210'000 (27%)
- Mortgage: CHF 570'000
- Tranche 1: CHF 340'000 fixed-rate, 7 years, 1.78% (insurer)
- Tranche 2: CHF 230'000 SARON, 1.35% initial (cantonal bank)
- Weighted interest rate: 1.61%
The original offer from her regular bank: 2.05% on the entire amount as a fixed-rate mortgage.
The difference: 0.44 percentage points. That is CHF 2'508 per year or CHF 17'556 over 7 years. Enough to finance a kitchen renovation.
Use the immometrics budget calculator to see how different interest rates affect your maximum purchase price.
Checklist: Mortgage Negotiation for Investment Properties
- At least 3 quotes obtained from different providers (banks, insurers, brokers)
- Complete dossier assembled (personal, property, calculation)
- Affordability checked in advance with imputed interest rate
- Mix strategy (SARON + fixed-rate) evaluated
- Amortisation model chosen (direct vs. indirect)
- Tranche terms staggered
- Special repayment options checked
- Offers available in writing and directly compared
- Existing banking relationship used as a negotiation argument
- Timing considered (quarter-end for better conditions)
Frequently Asked Questions
How much equity do I need for a mortgage on an investment property?
Swiss banks require at least 25% equity for investment properties, some even 30%. Unlike owner-occupied homes, you may not use pension fund assets as equity. Pillar 3a assets are permitted, however. For a purchase price of CHF 800'000, you need to bring at least CHF 200'000 from your own funds, plus transaction costs of approximately CHF 16'000 to CHF 40'000 depending on the canton. Check your situation with the affordability calculator.
Can I deduct mortgage interest on an investment property from my taxes?
Yes, mortgage interest for investment properties is fully deductible from taxable income. This applies to both SARON and fixed-rate mortgages. However, the rental income must be taxed as income. The tax effect is often the main reason why high leverage on investment properties can make sense from a tax perspective, as long as affordability is maintained.
SARON or fixed-rate: which is better for investment properties?
That depends on your risk appetite and your cashflow situation. SARON mortgages offer lower interest rates but less planning certainty. Fixed-rate mortgages are more expensive, but you know exactly what you will pay over the term. Many investors choose a mix strategy: the larger portion as a fixed-rate for planning security, the smaller portion as SARON to benefit from low rates. Make sure to stagger the tranche terms.
Is a mortgage broker worthwhile for investment properties?
Mortgage brokers can be especially valuable for investment properties because the interest rate differences between providers are larger than for owner-occupied homes. A good broker compares 20 to 40 providers and negotiates on the client's behalf. The brokerage is typically free for the client (the broker is paid by the bank). On mortgages from CHF 500'000, the savings over the term can amount to CHF 10'000 to CHF 20'000.