A Real Estate Investor’s Financing Strategy – Leverage, Margins, and a Properly Structured Loan Portfolio

Leverage is the most effective tool in real estate investing—and its misuse is the most common reason why investors run into trouble. How can you build a financing strategy that will withstand even tough times? We’ll walk you through optimal leverage, the importance of margins, interest rate hedging, and the 40-year loan term that took effect in 2026—with concrete calculations.

The power of real estate investing is fundamentally based on the fact that an investor can grow their wealth using other people’s money—a bank loan. This is called leverage, and it sets real estate investing apart from most other forms of investment. In principle, a stock investor can use debt, but the vast majority of individual investors buy stocks with their own capital. A real estate investor, on the other hand, can build a portfolio worth hundreds of thousands of euros with relatively little of their own capital—provided their financing strategy is designed to be sustainable.

The very same mechanism that makes real estate investing effective also makes it risky. Leverage multiplies both gains and losses. The interest rate cycle of recent years was a valuable lesson in this regard: investors who built their portfolios with excessive leverage during the zero-interest-rate period paid a heavy price for it in 2023–2024, when the Euribor rose rapidly to over 4 percent.

A financing strategy is therefore not just a technical aspect of real estate investing; rather, it is the backbone of the investment’s entire return and risk profile. Let’s examine it one aspect at a time.

Optimal Leverage – What Is the Right Debt-to-Equity Ratio?

There are several rules of thumb regarding debt-to-asset ratios in real estate investment advice. The most common recommendation is that the loan-to-value (LTV) ratio for an individual property should not exceed70–75 percent—meaning that equity should account for at least 25–30 percent of the purchase price. At the portfolio level, the debt-to-asset ratio should not exceed60–65 percent to ensure there is a buffer in case of a decline in the value of individual properties or cash flow problems.

It is important to distinguish theserisk management recommendationsfrom the statutoryloan-to-value limit. The loan-to-value limit (maximum loan-to-value ratio) is an upper limit set by the Financial Supervisory Authority on the proportion of a home’s value that can be financed with a loan. Following a regulatory change that took effect in 2026, the Financial Supervisory Authority can set the loan-to-value limit at a maximum of 95 percent for all homebuyers—previously, the limit for non-first-time homebuyers was 90 percent. However, just because a loan of up to 95 percentis availabledoes not mean that an investorshouldtake on that much debt. The regulatory cap and a reasonable level of risk are two different things.

More important than any single percentage figure is the fact thatcash flow holds up under all realistic stress scenarios. The following calculation illustrates what a stress test looks like in practice for a single property.

Example:A €120,000 apartment, a €90,000 loan (75% LTV), a 25-year annuity loan, and a margin of 0.8%. The total interest rate in the base scenario is the 12-month Euribor (~2.9%) plus the margin, which equals approximately 3.7%.

The calculation highlights the key point: a single property can still cope reasonably well with moderate interest rate pressure, but when interest rate stress is combined with a drop in rent, an increase in maintenance fees, or a tenant vacancy, cash flow quickly turns negative. A single month of vacancy alone can wipe out the entire year’s positive cash flow many times over.

This leads to a golden rule:a cash buffer is not optional.Every investor should have a cash buffer in liquid assets equivalent to at least 3–6 months’ worth of loan servicing costs for each property. A cash buffer is not unproductive “dead capital”; rather, it is insurance that allows you to maintain your portfolio even when a single property is temporarily unprofitable. A forced sale at the wrong time is the most costly mistake a real estate investor can make—and a cash buffer is precisely what prevents it.

Margins – A Small Number, a Big Impact

The bank margin is the fixed surcharge added to the Euribor reference rate. Unlike Euribor, the margin isnegotiable and varies by bank and by customer. A typical margin is currently around0.5–1.2 percent, and for real estate investors it is often slightly higher than for buyers of their own homes—depending on the bank’s policy, the scope of the customer relationship, and the strength of the collateral.

The impact of the margin at the portfolio level is significant. Let’s consider an investor with a loan portfolio of 500,000 euros.

An annual difference of 3,000 euros may sound small, but over a twenty-year period, it amounts to60,000 euros—even without the compound interest effect. Competing on margins is therefore not a minor adjustment, but one of the most strategically significant individual steps an investor can take to improve their returns.

Competition among banks has intensified as the housing market has slowed, which strengthens the negotiating position, particularly for investors who own multiple properties and have a comprehensive banking relationship with one or a few banks. The most effective bargaining tool is a credible threat to switch banks: once another bank has made a concrete offer, your current bank has a reason to respond. It’s also worth reviewing the margin on existing loans—many people are paying a higher margin on an old loan than they would under a new agreement.

Fixed or Variable Interest Rate – A Strategic Choice

Fixed-rate mortgages remain a timely issue, as the future direction of the Euribor is uncertain. Geopolitical shocks can cause oil prices—and, consequently, inflation and interest rates—to fluctuate very rapidly: in the spring of 2026, a conflict in the Middle East drove up crude oil prices and widened the spread in interest rate expectations. Although the situation has since begun to ease, the episode served as a reminder of how quickly the outlook can change. Inflationary pressures may keep interest rates higher than expected, but on the other hand, a slowdown in economic growth could push them down. No one knows for sure which factor will prevail.

From a pure cash flow perspective, a fixed interest rate is a form of insurance that comes at a cost. If the Euribor falls as expected, you’ll pay extra with a fixed rate. If the Euribor rises unexpectedly, the fixed rate protects you. Since the future is unpredictable, the most sensible approach at the portfolio level isto diversify: some loans should have variable rates, some fixed rates, and ideally with different interest rate terms. This reduces the impact of a single interest rate scenario on the entire portfolio and ensures that the entire loan portfolio does not come due at the same unfavorable time.

Diversification also applies to the choice of benchmark rate. A short-term benchmark rate (3-month Euribor) reacts quickly to market conditions and is beneficial when interest rates fall, whereas the 12-month Euribor offers predictability and protection against short-term spikes. Both have their place in different investment strategies.

Right to Deduct Interest – An Often-Overlooked Part of Income

A financing strategy cannot be considered in isolation from taxation. Unlike interest on a mortgage for one’s own home,interest on debt related to rental operations is fully deductible from rental income. In practice, this means that leverage reduces taxable rental income: the higher the interest expense, the lower the taxable net income.

This is part of the reason why moderate leverage can be justified from a tax perspective even when an investor could afford to purchase the asset entirely with their own capital. However, the interest deduction does not make an expensive loan free—it merely mitigates its impact. The deduction applies to interest, not principal payments, and its value depends on the investor’s tax rate. High leverage solely for the sake of a tax deduction is rarely sensible: the risk increases faster than the tax benefit.

A 40-year loan term—how does it affect the calculations?

A regulatory change that took effect in early June 2026 extended the maximum term of a mortgage from 30to 40 years. The decision had already been made in the spring—the Parliament’s Finance Committee even went further than the government’s original proposal of 35 years—but the law did not take effect until the first day of June. The aim of the change was to boost the stagnant housing market and give households more flexibility.

From a real estate investor’s perspective, a longer loan term is a double-edged sword.A longer loan term reduces the monthly payment, which improves the property’s cash flow and frees up capital for new investments. At the same time, however, itsignificantly increases total interest expenses, as the principal is paid down more slowly and interest is paid for a longer period. The Bank of Finland has also noted that longer loan terms increase interest expenses and may encourage borrowers to take out larger loans.

It is crucial for investors to understand thata 40-year loan term is not a fixed choice but rather an option that offers flexibility. A longer maximum term provides breathing room during periods of weak cash flow, but the loan can—and should—be paid off more quickly when circumstances allow. A strategically smart approach is to officially take out a loan with a long repayment term for a safety margin, but in practice pay it off according to a shorter schedule. This way, you get the benefits of flexibility without paying the full price in total interest costs. A longer loan term only becomes a problem if it’s used as an excuse to buy more than your finances can actually handle.

Annual Update of the Financing Strategy

A real estate investor’s financing strategy is not a one-time plan but a process that requires ongoing monitoring. At least once a year, it’s a good idea to review your entire loan portfolio and check:

• Marginsrelative to current market levels—and seek competitive bids if the difference is significant.
• The status of collateralrelative to the current value of the properties. An increase in value can free up collateral for new acquisitions; a decrease in value can weaken one’s negotiating position.
• Cash flow under different interest rate scenarios, so you know at what point your buffer starts to dwindle.
• The adequacy of buffersrelative to the size of the portfolio and the level of interest rates.
• The timeliness of interest periods and the fixed/variable distribution.

Especially now, when market conditions have changed rapidly and regulatory changes have opened up new opportunities—longer loan terms, fiercer competition among banks—active financial management is one of the best ways to improve portfolio returnswithout making a single new real estate purchase. Negotiating a better margin or restructuring interest rate risk can yield more than the total annual rent increases combined.

Summary

Leverage is a real estate investor’s most important tool, but its value depends entirely on how it is used. A well-structured financing strategy does not aim to maximize leverage but to optimize it: sufficient equity and a cash buffer, competitively negotiated margins, diversified interest rate risk, and realistic stress testing form a comprehensive approach that can withstand even tough times. It is precisely this resilience—not squeezing every last percentage point of return during a boom—that distinguishes the long-term investor from those who are forced to sell at the wrong time.

The changes coming in 2026—above all, the 40-year loan term and fiercer competition among banks—will provide investors with new tools. They will reward those who use this flexibility judiciously—and penalize those who interpret it as a license to take on more risk than the economy can bear.

This article is a general overview and is not a substitute for personalized financial or investment advice. Interest rates, margins, and regulations are subject to change, and every investor’s situation is different. Financial decisions should be made based on your overall situation and a discussion with a professional.

Frequently asked questions

What is an appropriate level of leverage in real estate investing?As a general risk management recommendation, the loan-to-value (LTV) ratio for a single property should be kept at no more than 70–75 percent, and the debt ratio for the entire portfolio at 60–65 percent. The most important factor is not a single figure, but rather that cash flow can withstand rising interest rates, falling rents, and months of vacancy all at the same time.

Should a real estate investor take out a 40-year loan?A longer loan term reduces monthly payments and improves cash flow, but increases total interest costs. It’s best to use this as a flexible option—take out a loan with a long repayment period for security, but pay it off faster when cash flow allows. It becomes a risk, however, if the longer term tempts you to buy beyond your means.

How much of a cash buffer should a real estate investor have?As a rule of thumb, the amount should be at least equivalent to 3–6 months of loan servicing costs for each property. The buffer prevents a forced sale in a situation where the property is temporarily unprofitable, for example, due to a gap in tenants or a spike in interest rates.

Can you negotiate the margin on a mortgage?Yes. The margin varies by bank and is negotiable, typically ranging from about 0.5 to 1.2 percent. Your best bargaining chip is a competing offer from another bank. It’s also a good idea to check the margin on your existing loans, not just new ones.

Can interest on a loan for a rental property be deducted for tax purposes?Yes. Interest on a loan for rental property is fully deductible from rental income, unlike interest on a loan for one’s own home. The deduction applies to interest, not principal payments.

Sources

• Bank of Finland – Euribor Rates and Lending by Monetary Financial Institutions:https://www.suomenpankki.fi/fi/tilastot/rahalaitosten-tase-ja-luotonanto/
• Financial Supervisory Authority – Mortgage Loans and Maximum Loan-to-Value Ratio (Loan Cap):https://www.finanssivalvonta.fi/kuluttajansuoja/lainat/asuntolaina/
• Financial Supervisory Authority – Maximum loan-to-value ratio (loan cap):https://www.finanssivalvonta.fi/saantely/makrovakausvalvonta/enimmaisluototussuhde/
• Finanssiala ry – Finance Committee’s Position on a 40-Year Maximum Loan Term:https://www.finanssiala.fi/uutiset/asuntolainaa-voisi-lain-mukaan-saada-jopa-40-vuodeksi-talousvaliokunnalta-ennakkoluuloton-linjaus/
• Finlex – Government Proposal on Changes to Mortgage Lending Regulations (HE 190/2025):https://www.finlex.fi/fi/hallituksen-esitykset/2025/190
• Finnish Tax Administration – Taxation of Rental Income and Deduction of Interest Expenses:https://www.vero.fi/henkiloasiakkaat/omaisuus/vuokratulot/
• Nordea – 12-Month Euribor and Interest Rate Outlook:https://www.nordea.fi/henkiloasiakkaat/palvelumme/lainat/asuntolainat/euribor.html