Borrowing capacity estimates how much a household may finance from income, existing monthly obligations, loan term and interest rate. It connects an affordable payment with a debt-to-income reference and a possible loan principal. The result is useful before property hunting or a bank conversation, but it is not a loan approval.
Borrowing capacity = affordable payment × (1 - (1 + monthly rate)^-months) / monthly rate
The calculation first estimates the maximum monthly payment: net monthly income × 35% − existing monthly obligations, using the debt-to-income reference retained by the page. That payment is then converted into principal with the standard amortizing-loan formula: principal = payment × (1 − (1 + monthly rate)^−number of months) ÷ monthly rate.
Example: with €3,000 net monthly income and €200 of existing obligations, a 35% reference leaves €850 available for the new loan. Assuming a 4% loan rate over 20 years, that supports roughly €140,300 of principal before closing costs, insurance and down payment decisions.
Read the figure as a starting envelope. The same payment does not buy the same amount at different rates, terms, insurance costs or fee levels. If the remaining cash flow is too low, a theoretical capacity may be uncomfortable or may not pass a lender's full review.
The first step is turning income into a maximum payment. A €3,000 income does not automatically free €1,050 if other loans, support payments, retained rent or recurring obligations are already present.
For the same monthly payment, a higher rate lowers the supported principal because more of each payment goes to interest. A one-point change can move a property budget by thousands over a long term.
A longer term spreads repayment and increases the possible principal. It also extends the period during which interest is paid. Comparing 20, 25 and 30 years shows whether extra budget is worth the extra cost.
Borrowing capacity is not the same as purchase price. Closing costs, guarantees, brokerage, moving costs, repairs and furniture may need separate cash or may reduce the realistic budget.
An acceptable debt-to-income ratio can still hide stress. Food, transport, energy, healthcare, children, emergencies and savings should still fit after the mortgage payment.
A lender does not rely on the formula alone. It reviews income stability, account history, savings after purchase and project quality. The calculator prepares a conversation; it does not replace underwriting.
For a financial decision, do not keep only the payment, return or final amount. Check total cost, fees, duration, possible inflation and available cash flow to understand what the result really implies. This extra context makes the estimate easier to compare with a quote, statement or long-term plan.
Increase the rate, lower the expected return or add fees to see how resilient the result is. If a small change removes the safety margin, treat the number as a fragile assumption rather than a secured target. Keep the cautious case visible before committing money.
An online finance calculation helps prepare comparisons, but it does not replace a bank offer, statement, tax document or contract. Before acting, reconcile the result with official documents and rules that apply to your situation.
Keep the entered values, date, currency, rate, term and fees included or excluded. This record makes the simulation repeatable and explains why two similar outputs can lead to different decisions.
Use the result to set a search range before adding closing costs, moving costs and possible repairs.
Use a prudent average or guaranteed recurring income rather than one exceptional month.
A car loan, support payment or other credit reduces the available payment directly in this model.
Test a shorter term for total cost and a longer term for monthly comfort.
This estimate is general information, not a personalized financial recommendation or a credit decision. Lenders may also assess job stability, savings, account behavior, insurance, age, household situation, property type and internal risk rules.
It is a common reference. Real lending decisions can vary with income level, remaining cash flow and risk profile.
Include it if it will remain after the purchase. Exclude it if it disappears and is replaced by the new mortgage payment.
More of the same payment goes to interest, leaving less room to repay principal.
No. It helps prepare the budget, but approval depends on the lender's full review.
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