Rechnerpilot Calculator

Mortgage financing calculator

Model a German property financing from capital need, equity, borrowing rate and initial repayment or desired payment, including balance and schedule.

Available

Inputs

Enter values

Live

Payment from rate and repaymentDetermine the monthly payment from initial repayment

Kapitalbedarf

Purchase price

EUR

Purchase costsi

EUR

Gesamtbetrag, zum Beispiel aus dem Kaufnebenkostenrechner.

Equity

EUR

Annual borrowing rate

Annual initial repayment

Fixed-rate period

Jahre

Maximum projection term

Jahre

Optional annual extra repaymenti

EUR

Modellhaft am Ende jedes vollen Darlehensjahres; Vertrag ist maßgeblich.

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Explanation

How Mortgage financing calculator works

The calculator uses the same central annuity and amortisation functions as the existing loan calculators. It links capital need with payment, fixation, balance and optional annual extra repayment.

Two calculation directions

Payment from initial repaymentMonatsrate = Darlehen × (Sollzins + Anfangstilgung) / 12

Percentages are divided by 100 before calculation.

Initial repayment from paymentAnfangstilgung = Monatsrate × 12 / Darlehen − Sollzins

The payment must exceed the initial monthly interest.

Monthly scheduleZins = Restschuld × Sollzins / 12; Tilgung = Rate − Zins

At each full year-end, the optional extra repayment reduces the balance.

Practice

Practical examples

Payment from rate and initial repayment

€400,000 price, €40,000 costs, €100,000 equity, 3.5% borrowing rate, 2% initial repayment, ten-year fixation and no extra repayment.

Result: Loan €340,000; initial monthly payment €1,558.33.

Repayment from desired payment

Total need €440,000, equity €100,000, borrowing rate 3.5% and desired payment €1,800.

Result: Loan €340,000; calculated initial repayment about 2.85% and modelled term about 22 years 11 months.

Notes

Common mistakes

Omitting purchase costs from the loan need
Only the purchase price is planned.
Enter purchase costs and available equity completely.
Confusing fixation with total term
The end of fixation is read as full repayment.
Review the fixation-end balance and modelled term separately.
Planning extra repayment without contract rights
Any annual payment is assumed possible.
Use only contractually permitted amounts and dates.

FAQ

Frequently asked questions

How is the loan amount determined?

Purchase price and costs are added and equity is deducted. A negative amount is limited to zero.

How is the annuity calculated?

In repayment mode, the initial annual annuity is loan times borrowing rate plus initial repayment. Payment mode uses the entered monthly payment.

What does desired-payment mode calculate?

It derives initial repayment from payment, loan and rate and simulates the term with the shared amortisation schedule.

What is the balance at the end of fixation?

It is the loan balance after modelled payments and extra repayments. A different rate may apply to follow-on financing.

How is extra repayment handled?

The engine applies the entered amount at the end of each full loan year. Contractual dates and limits may differ.

Are total interest costs binding?

No. They assume a constant borrowing rate over the model term. Follow-on rates, fees and commitment interest are omitted.

What if the payment is too low?

If it does not cover initial interest, no repayment occurs and the input is rejected.

What do equity and loan-to-purchase ratios show?

Equity is related to total capital. The simplified loan ratio uses purchase price and is not a bank loan-to-value assessment.

What is in the amortisation schedule?

It summarises annual payments, interest, principal and remaining balance from the shared annuity model.

Is this a loan offer or advice?

No. It is a model and does not assess creditworthiness, actual terms or personal affordability.

Limits

Limitations

The borrowing rate remains constant after fixation; no follow-on rate is forecast.
Fees, commitment interest, subsidised loans, rate changes and individual payment dates are omitted.
The loan ratio is a simple purchase-price ratio, not a bank valuation.
No financing approval or personalised financial advice.

Sources

Sources and references

ImmobilienkreditBundesanstalt für Finanzdienstleistungsaufsicht (BaFin)
Official consumer information on property loans, fixation, repayment and risks.
View source
§ 489 BGB – Ordentliches Kündigungsrecht des DarlehensnehmersBundesministerium der Justiz / Bundesamt für Justiz
Official legal basis for borrower termination rights; the engine does not test its conditions.
View source
§ 17 PAngV – Immobiliar-VerbraucherdarlehenBundesministerium der Justiz / Bundesamt für Justiz
Official disclosure rules for property consumer loans; the calculator does not determine the legally relevant offer APR.
View source

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