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Common mortgage questions
What is the monthly payment on a €300,000 mortgage?+
On a €300,000 annuity mortgage at 4.5% over 25 years, the monthly payment is approximately €1,667. Total repaid over the term is around €500,100, of which €200,100 is interest. At 3.5%, the monthly payment drops to €1,502 — saving €165/month and €49,500 in total interest.
How does a 1% interest rate rise affect my mortgage?+
A 1% rate increase on a €300,000 / 25-year mortgage adds roughly €155/month. Over the full 25-year term, that extra 1% costs around €46,000 more in total interest. Even small rate changes have a large long-term impact — use the calculator to compare different scenarios.
Is a serial loan cheaper than an annuity mortgage?+
Yes. A serial loan (fixed principal each month) always costs less in total interest because the balance reduces faster. On a €300,000 / 25-year loan at 4.5%, a serial loan saves roughly €40,000–€50,000 in total interest compared to an annuity loan. The trade-off: the first monthly payment is around €2,125 — significantly higher than the annuity equivalent of €1,667.
How much of my payment goes to interest vs. principal?+
In early years, most of each annuity payment is interest. On €300,000 at 4.5%, the first payment of €1,667 splits roughly €1,125 interest / €542 principal. By year 20, the split reverses: ~€300 interest / €1,367 principal. The full year-by-year breakdown is shown in the repayment schedule table above.
Does overpaying my mortgage make a big difference?+
Yes — significantly. On a €300,000 / 4.5% / 25-year mortgage, overpaying just €100/month cuts the term by around 3 years and saves approximately €18,000 in interest. Overpaying 10% of the monthly payment (€167) saves even more. Even small consistent overpayments compound over time due to the reducing balance.
Annuity vs. serial loan — what's the difference?
Annuity loan
Monthly payment = P × [r(1+r)ⁿ] / [(1+r)ⁿ−1]
Every monthly payment is the same. Early payments are mostly interest; later payments are mostly principal. Common in the UK, US, and much of Europe. Easy to budget for.
Serial loan
Monthly payment = (P ÷ n) + (remaining balance × monthly rate)
The principal repaid each month is fixed. Because the balance falls faster, interest decreases every month — so your payment is highest at the start and lowest at the end. You pay less total interest than an annuity loan. Known as a serielån in Norway and Denmark, lineaire hypotheek in the Netherlands, and Tilgungsdarlehen in Germany. Less common but available in many countries.
Which costs less overall?
A serial loan always costs less in total interest than an annuity loan at the same rate and term — because the balance reduces faster. The trade-off is that the first payments are significantly higher.
How does the interest rate affect payments?
A 1% rate increase on a €300,000 / 25-year annuity loan adds roughly €150 per month. On a serial loan the impact is largest in year 1 and shrinks over time.