Estimate your monthly mortgage payment, toggle interest-only repayment, itemize transfer fees, evaluate time-bounded bond optimizations, and analyze risk profiles.
The Mortgage as a Financial Asset (Lender Perspective)
An analysis of mortgage credit origination, long-term cash flow generation, and portfolio revenue scaling from the lending institution's balance sheet perspective.
Originated Credit Asset ($t=0$)—
Cumulative Scheduled Cash Receipts ($t=N$)—
Cumulative Gross Interest Harvest—
Gross Revenue Harvest Multiple—
Where your mortgage payments go
A visual breakdown of your total lifetime repayment commitment into loan principal vs compounding interest.
Standard Plan Total: ——
Optimized Plan Total: ——
Principal Repaid Lifetime Interest Charges Optimized Principal Optimized Interest
What that represents in your time
Converts mortgage financial commitments into income-equivalent working hours based on your net hourly earnings.
Net hourly income after taxes and payroll deductions.
Total Repayment Commitment30 years
Working Time for Interest Alone8,910 equivalent working hours
Additional Ownership Costs (Owner Burden)Not included—enter your costs
With Selected Optimizations (Savings)0 hours saved
*Note: Additional ownership costs (property taxes, insurance, maintenance) represent the property owner's operational burden and are kept strictly separate from lender receipts. Working-hour calculations express income equivalence and do not imply literal labor performed for the lender.
Interest Rate Stress Test (ARM Risk Mitigation)
Evaluate how adjustable rate mortgage (ARM) rate hikes or cuts impact your monthly payment under normal or interest-only terms.
%
Simulated Rate—
Standard Payment under Adjustment—
Monthly Payment Impact—
Optimization Interest Cushion—
Macroeconomic Risk & Decision Settings
Enter your local economic parameters (e.g. 10-year average inflation) to evaluate whether prepaying principal is more advantageous than holding cash or investing.
Erodes real debt burden over time.
Net return from alternative assets (e.g. equities, index funds).
Lender Capital & Profitability Model (Optional Assumptions)
Model estimated lender Net Interest Margin (NIM) and Return on Allocated Equity (ROE) by configuring explicit regulatory capital and funding cost assumptions.
Assumed Tier 1 shareholder equity allocated per loan (e.g. 3.5% under Basel III 35% LTV risk-weighting).
Assumed interest rate paid on central bank borrowing or deposit liabilities.
Allocated Shareholder Equity Outlay ($t=0$)—
Estimated Net Interest Income (NIM Basis)—
Estimated Net Return on Allocated Equity (ROE)—
Average Annual Return on Equity (Simple ROE / Term)—
*Disclaimer: Figures represent a hypothetical financial model based strictly on user-entered assumptions. Actual bank profitability depends on institutional capital structures, hedging strategies, default provisions, and loan servicing overhead.
What changes with extra repayments?
Enable optimization options below to calculate savings.
Total repayments · standard plan—
Total repayments · selected plan—
Interest saved—
Total interest · selected plan—
Repayment period reduced by—
Payoff month · selected plan—
Bond Optimization Controls
Visual Progress Chart
Standard repaymentsWith selected optimization
How the transaction is recorded (Balance Sheet & Credit Creation)
Your Mortgage: Two Sides of the Agreement
An accounting breakdown of contractual obligations, balance sheet entries, and scheduled cash flows between borrower and lender.
Accounting & Legal Dimension
Borrower (Homebuyer)
Lender (Commercial Bank)
Mortgage at Origination (t=0)
€400,000.00 Contractual Debt
€400,000.00 loan asset + matching deposit liability created
Scheduled Principal Repayments
€400,000.00 Principal Paid
€400,000.00 principal received; loan asset reduced
Scheduled Lifetime Interest
€222,752.29 Cash Outlay
€222,752.29 Gross Revenue Received
Total Scheduled Cash Outlay / Flow
€622,752.29 Total Scheduled Outlay
€622,752.29 Gross Cash Collected
Repayment Ratio per Unit Borrowed
€1.56 Repaid per €1.00 Borrowed
€1.56 received per €1.00 lent
Property Collateral & Security
Property pledged as security
Security interest in the property*
*Note: Priority of title lien and personal recourse liability depend on the specific loan agreement and legal jurisdiction. Assumes standard scheduled repayments retained by the lender over the full term without early prepayment. Excludes bank operating costs or funding expenses.
1. Modern Credit Origination
According to central bank publications, commercial banks do not act merely as intermediaries lending out pre-existing customer deposits. When a commercial bank issues a mortgage, it creates brand-new digital credit by recording the borrower's loan contract as an asset and crediting the borrower's account with a matching deposit liability.
2. The Principal vs. Interest Discrepancy
While the loan principal is created digitally upon loan origination, the cumulative interest required to service the loan over 20 or 30 years is not created simultaneously. Borrowers must compete for existing liquidity within the broader economy through earned income and real productive labor to service interest obligations.
3. Debt Extinguishment via Bond Optimization
During monthly repayment, the interest portion forms bank gross revenue while the principal portion cancels out the matching deposit liability created at origination. Applying targeted extra prepayments (such as Double Monthly Payment or Salary Accelerator) accelerates principal destruction, permanently extinguishing the credit liability early and eliminating compounding interest.
Official Primary Sources & Empirical Literature
Bank of England (2014): McLeay, M., Radia, A., & Thomas, R., "Money creation in the modern economy", Bank of England Quarterly Bulletin, 2014 Q1, pp. 14–27.
Deutsche Bundesbank (2017): "The role of banks, non-banks and the central bank in the money creation process", Monthly Report, April 2017, pp. 13–33.
Prof. Richard A. Werner (2014): Werner, R. A., "Can banks individually create money out of nothing? — The theories and the empirical evidence", International Review of Financial Analysis, Vol. 36, pp. 1–19.
Repayment schedule (amortization)
Month
Regular payment
Interest
Principal*
Extra paid
Balance
Educational & Legal Disclaimer: This calculator and its accompanying guides are provided exclusively for educational and illustrative purposes. Calculations exclude potential early repayment charges (ERCs), administrative fee adjustments, or individual tax obligations. Commercial bank balance sheet mechanics described herein reflect empirical central bank literature (e.g., Bank of England, 2014; Deutsche Bundesbank, 2017). This tool does not constitute binding financial, legal, or tax advice. Consult a qualified professional and your specific loan contract before making financial decisions.