Indicative estimates only. Monthly reducing-balance interest; monthly repayments at period end. A rate change is applied from month 13. Service fees and insurance are assumed fixed. Balloon is due as a separate final payment. No statutory fee caps or lender-specific formulas are implied.
| Month | Payment | Principal | Interest | Fees + insurance | Balance |
|---|
Explore how your balance, interest and principal change over the life of the loan. Move your pointer or tap the graph for a detailed breakdown.
Stress tests assume a fixed rate throughout; results are estimates, not lender quotes. Cost totals exclude the deposit and any unentered costs.
Model settling an existing loan at a selected repayment month, or making a lump-sum payment and continuing. Uses the loan assumptions above; actual settlement quotes may include accrued daily interest, fees and contractual charges.
For home loans, estimate property appreciation, renovation spending, potential value uplift, sale proceeds and equity. All growth and renovation effects are user assumptions, not market forecasts.
| Year | Property value | Loan balance | Equity | Maintenance (year) |
|---|
Save scenarios from the calculator, then select them below. Lower total cost is not always the best fit if terms or loan amounts differ.
This is a cash-flow planning aid, not a credit approval, statutory affordability assessment, or lender quote. Income taxes are assumed already deducted.
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Reducing-balance interest
Interest is charged on the amount still outstanding, not repeatedly on the original loan. Early payments often contain more interest; later payments contain more principal.
Nominal annual interest vs effective cost
An 18% nominal annual rate corresponds to 1.5% monthly under this model. Fees and insurance increase the total borrowing cost; the headline rate alone does not reflect them. This app does not calculate a legally defined APR.
Balloon / residual
A lump sum still owed at the end of the agreed term. It lowers ordinary instalments but can substantially increase interest and creates a large final obligation.
Extra repayments
Additional amounts paid directly toward principal can reduce interest and shorten the term, subject to your credit agreement and any early-settlement charges.
Fixed and variable rates
A fixed rate stays constant in this projection. For a variable-rate scenario, you can model one change after month 12; real lender changes may occur at other dates.
South African considerations
Ask the lender for its full pre-agreement statement and quotation, including initiation fees, monthly service fees, insurance, all compulsory costs, any residual and early settlement conditions. Home purchases can also involve transfer duty, conveyancing, bond registration, rates and insurance, which are not automatically calculated here.
Investment Studio
Explore saving, compound growth, recurring deposits, inflation, fees, tax assumptions and the impact of market volatility. All rates are assumptions you control.
The model compounds monthly using an effective annual return assumption, then deducts estimated percentage fees and tax drag monthly. Tax drag is a simplified scenario, not a calculation of South African income tax, dividends tax or capital gains tax. Actual investment returns fluctuate and may be negative.
Investment outlook
Select a year on the graph to inspect its values.
| Year | Invested | Balance | Growth net of fees | Today's purchasing power |
|---|
Uses the projected investment balance as the starting retirement pot. Withdrawals occur at the end of each month. Does not model tax, sequence-of-returns risk or regulatory withdrawal limits.
Pay Off Debt or Invest?
A practical side-by-side comparison of putting extra money into your home loan versus investing the same amount. See which strategy could leave you better off at your chosen date.
Same monthly cash budget in both strategies. Once the bond is paid off, its former normal repayment plus the extra amount is invested until the comparison date. Returns are smooth illustrative assumptions; taxes, risk, rate changes and lender charges are excluded.
| Year | Extra to bond: net position | Invest extra: net position | Difference |
|---|
My Financial Journey
Put your home, mortgage, savings and investments on one timeline. Change the assumptions and see how your estimated net worth evolves. This is a planning model, not a prediction.
The model keeps other assets and other debts constant, and assumes regular monthly mortgage and investment payments. It does not include property sale costs, property running expenses, taxes, changes in rates, income changes or unexpected events.
The graph shows projected nominal values. Net worth includes property equity, investments and other assets, less other debt.
| Year | Home value | Mortgage left | Home equity | Investments | Net worth | Today's rands |
|---|
Property Decision Studio
Compare renting against buying, then evaluate an investment property's rental yield, cash flow and long-term equity.
Where does the money go?
| Sell after | Buying: net sale proceeds | Renting: invested savings | Difference |
|---|
The renter invests the deposit and purchase costs, plus any monthly savings compared with ownership. When renting costs more, the model deducts that difference from the renter's investment pot. No tax, financing fees, tax relief or changing bond rates are modelled.
Gross yield, net operating yield, cash-on-cash return and projected equity are estimates. Cash flow excludes tax, capital improvements after purchase, special levies, unexpected repairs and tax on sale.