A long fixed-interest period initially provides predictability. However, it does not necessarily mean that the entire loan will have been repaid by its end. If a residual debt remains, it must be clear how this will be financed or settled from other funds. A simple burden test helps to understand the scale long before a concrete follow-up offer is available.
The starting point is the residual debt at a specific date
Take the current repayment schedule and clarify to which reference date the expected residual debt relates. Special repayments already made or changed instalments can overtake an old schedule. If anything is unclear, ask the financing institution for a current statement. Do not confuse the originally borrowed loan amount with the amount that will actually still be outstanding later.
Also note when the agreed fixed interest period (Sollzinsbindung) ends and whether several loans have different dates. Two loan components for the same property can require different proceedings. A single reminder with the word “Hauskredit” is often too imprecise for that.
A simple initial comparison instead of an interest-rate forecast
For a rough comparison you can multiply the residual debt by the sum of the assumed nominal interest rate (Sollzins) and the initial annual repayment, and divide by twelve. That shows an approximate initial monthly instalment of an annuity loan. It does not replace a full repayment schedule nor a comparison of the effective interest rate or a cost calculation of a concrete offer.
Fictitious example with no relation to current market interest rates: With a residual debt of 180.000 euros and assumed 3 percent nominal interest plus 2 percent initial repayment, you get roughly 750 euros per month. With 5 percent nominal interest and the same initial repayment it is roughly 1.050 euros. The difference is 300 euros per month. These interest rates are scenarios, not a recommendation and not a prediction.
The comparison makes visible how much additional leeway would be required. It does not yet explain whether a bank will offer these conditions or whether the remaining term fits your personal planning. For that you need concrete offers and complete payment schedules in the next step.
Do not treat repayment as a convenient residual variable
A lower repayment can reduce the initial instalment, but it makes the residual debt disappear more slowly. Therefore compare not only the monthly instalment but also the debt level and the term. Ask which instalment would be necessary to be debt-free at your desired date. A particularly low start can conceal a high later burden.
Our editorial recommendation: First calculate one variant with an unchanged instalment and one with an unchanged desired debt-free duration. That way you can see whether a different interest assumption mainly shifts your monthly amount or your target year. Use a comprehensible calculation tool for this or ask for corresponding bank calculations; check the inputs each time.
Contractual rights have their own deadlines
§ 489 BGB contains termination options for loans, including for loans with fixed nominal interest in principle after ten years since full receipt with six months’ notice. Later agreements can be relevant for the decisive starting point. This is not a blanket calendar note “ten years after signing”; have the specific deadline run checked before you make arrangements. [DE-489]
Financing is also subject to rules on creditworthiness assessment. § 505a BGB also contains special provisions for certain follow-up agreements. This does not imply an automatic new full assessment in every case nor a right to any desired follow-up financing. [DE-505A] Therefore clarify early with the parties involved which documents and decisions are necessary for your variant.
Translate the burden test into a work plan
If the higher example instalment overwhelms your budget, that is a reason to continue calculating. Check your actual expenses, possible reserves and sensible repayment variants. A special repayment must not be planned with money that is needed for foreseeable necessary repairs. A calculation result alone does not yet lead to a suitable financing decision.
Finally record three things: the examined starting position, the assumptions made and the next date for updating. You will later replace an offer with its actual figures. In this way the planning remains useful even if income, property or the interest environment change. For an individual decision qualified financing advice is advisable.