How to Use This Calculator
Enter monthly take-home household income and recurring debt or essential obligations. Choose the percentage of income remaining after those obligations that you want to model as a mortgage payment. Then enter the annual interest rate, term and available deposit for the financing scenario you want to test.
How Mortgage Affordability Is Calculated
Supportable Mortgage Payment = Available Monthly Income × User-Selected Mortgage Allocation %
Supportable Loan Principal = Present Value of the monthly mortgage payments using the entered interest rate and term
Indicative Property Price = Supportable Loan Principal + Available Deposit
Mortgage Payment and Loan Principal
The calculator first determines the monthly payment budget. It then works backward through the standard amortizing-loan formula to estimate the principal that payment could support at the entered rate and term. A higher rate generally supports a smaller principal for the same payment, while a longer term generally increases principal capacity but can increase total interest paid.
Deposit and Property Price
The entered deposit is added to the estimated loan principal to show an indicative property price. This does not mean a lender will accept that deposit or finance the resulting property. Provider-specific minimum equity requirements and property eligibility rules still apply.
Acquisition Costs
Legal, agency, documentation, valuation and other acquisition costs are not automatically financed in this model. The optional acquisition-cost field is shown separately to remind the buyer that the deposit is not necessarily the only cash needed. Use the Property Purchase Cost Calculator for a detailed transaction breakdown.
Interest Rate and Term
Finelib does not insert a supposedly current mortgage rate because rates can vary by provider, borrower, product and time. Enter the rate applicable to the scenario being evaluated. The same principle applies to loan term and repayment-allocation assumptions.
Mortgage Affordability in Nigeria
Mortgage products and underwriting criteria can vary across Nigerian providers and programmes. Eligibility can depend on income evidence, employment or business history, age, property documentation, deposit/equity, credit assessment and other requirements. This calculator therefore models the mathematics while leaving lender-specific rules to verified current sources.
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Frequently Asked Questions
How much mortgage can I afford?
The calculator estimates a loan principal from your entered net income, obligations, chosen mortgage-payment allocation, interest rate and term.
Does the result mean a lender will approve me?
No. It is a mathematical planning scenario, not an approval or underwriting decision.
Does Finelib use a standard mortgage interest rate?
No. Enter the annual rate applicable to the financing scenario you want to test.
Why does the interest rate change how much I can borrow?
For the same monthly payment and term, a higher interest rate directs more of the scheduled payments toward interest and supports a smaller initial principal.
Does a longer mortgage term always make a mortgage cheaper?
No. It may reduce the payment required for a given principal or support a larger principal at the same payment, but total interest over the full term can be higher.
Are legal and property-purchase costs included in the mortgage amount?
Not automatically. This calculator shows entered acquisition costs separately. Whether any cost is financeable depends on the provider and product.
Should I use gross or take-home income?
This planning model is designed around net or take-home income. A lender may use a different income basis in its own underwriting.