Tilgung, or principal repayment, is a fundamental concept in German mortgage financing that directly impacts your cashflow, equity buildup, and total interest costs. Choosing the right Tilgung rate is one of the most important decisions a real estate investor makes, balancing monthly payment affordability against long-term wealth building.
How Tilgung Works in the German Annuity Mortgage
In the standard German annuity mortgage (Annuitätendarlehen), the Tilgung rate determines how quickly you repay the loan principal. At the start of the loan, the monthly payment consists mostly of interest (Zinsen) and a small amount of Tilgung. Over time, as the outstanding principal decreases, the interest portion shrinks and the Tilgung portion grows, while the total monthly payment remains constant. This automatic acceleration of principal repayment is a powerful wealth-building mechanism that distinguishes the German annuity structure from interest-only or variable-repayment mortgages used in other countries.
- The initial Tilgung rate (Anfangstilgung) determines the starting repayment speed
- Monthly payment = Zinsen (interest on remaining balance) + Tilgung (principal repayment)
- As principal decreases, the Tilgung share of the fixed monthly payment automatically increases
- This acceleration effect means a 2% initial Tilgung rate grows to 3-4% or more over 15-20 years
- Most German banks require a minimum initial Tilgung of 1%, though 2% or more is strongly recommended
Choosing the Right Tilgung Rate as an Investor
The Tilgung rate represents a trade-off between monthly cashflow and long-term equity buildup. A higher Tilgung rate means faster debt reduction and lower total interest paid over the loan's lifetime, but it increases your monthly payment and reduces cashflow. For investment properties, many German investors choose a lower Tilgung rate (1-2%) to preserve cashflow, especially in high-price markets where rents barely cover mortgage payments. However, this decision should be made deliberately, understanding the long-term financial implications.
- 1% Tilgung: Lowest monthly payment, maximizes cashflow, but loan takes 40+ years to repay and total interest is very high
- 2% Tilgung: The most common choice for investment properties, a balanced approach with loan repayment in approximately 25-30 years
- 3% Tilgung: Faster equity buildup, significantly lower total interest, loan repaid in approximately 20-23 years, but higher monthly payment
- Sondertilgung (special repayment): Most German mortgages allow 5-10% annual extra repayment without penalty, a valuable flexibility option
The Impact of Tilgung Rate on Total Interest Costs
The difference in total interest paid over the life of a loan between a 1% and 3% Tilgung rate is dramatic and often underestimated by novice investors. Higher Tilgung rates reduce the outstanding principal faster, which means less interest accrues each year, creating a compounding savings effect. Understanding this relationship helps investors make informed decisions that balance short-term cashflow needs against long-term profitability.
- At 3.5% interest, a 1% Tilgung on €250,000 generates approximately €230,000 in total interest over the life of the loan
- The same loan at 3% Tilgung generates approximately €115,000 in total interest, saving over €115,000
- Higher Tilgung also means faster equity buildup, improving your loan-to-value ratio for future refinancing
- A better LTV ratio at refinancing time typically qualifies you for lower interest rates
Practical Example: Tilgung Rate Comparison
Consider a €250,000 mortgage at 3.5% interest. Scenario A, 1% initial Tilgung: Monthly payment €937.50. After 10 years: €27,400 principal repaid, remaining balance €222,600. Total interest paid in 10 years: €85,100. Full repayment: approximately 46 years. Scenario B, 2% initial Tilgung: Monthly payment €1,145.83. After 10 years: €59,200 principal repaid, remaining balance €190,800. Total interest paid in 10 years: €78,500. Full repayment: approximately 28 years. Scenario C, 3% initial Tilgung: Monthly payment €1,354.17. After 10 years: €94,700 principal repaid, remaining balance €155,300. Total interest paid in 10 years: €67,800. Full repayment: approximately 21 years. The €416.67 monthly difference between 1% and 3% Tilgung results in €67,300 more equity and €17,300 less interest paid over 10 years.
Tips
- •Always negotiate Sondertilgungsrecht (special repayment right) of at least 5% annually in your mortgage contract, as this gives you the flexibility to make extra principal payments when you have surplus cash without incurring a Vorfälligkeitsentschädigung (prepayment penalty).
- •For investment properties with tight cashflow, start with a lower Tilgung rate (1-2%) but plan to increase it at refinancing when the fixed-rate period ends, since by then, rental increases and the lower remaining balance may allow a higher Tilgung without straining your cashflow.