MoneySmartCalc publishes educational tools based on standard financial formulas. This page explains what each tool calculates, which assumptions it uses and where its limits are.
Editorial principles
- We show formulas and assumptions clearly so users can review the results.
- We do not personalize recommendations or sell financial products.
- We do not store entered numbers: calculations run in the browser.
- When a variable depends on your country, lender or tax situation, we leave it editable.
Mortgage
The mortgage calculator uses the fixed-rate loan amortization formula: payment = principal × monthly rate / (1 − (1 + monthly rate)^−n). Principal is home price minus down payment and n is the number of monthly payments.
It does not include insurance, property taxes, HOA fees, lender fees or future rate changes on adjustable loans. Add those costs separately before making a real decision.
Salary after tax
The salary after tax calculator applies editable tax and contribution percentages to annual income. It is useful for quick budgeting, not as a substitute for an official payslip or tax return.
Savings goal
The savings goal calculator estimates the monthly contribution needed to reach a future target, accounting for current savings, timeline and expected annual return. The return is converted into a monthly compounded rate.
Compound interest
The compound interest calculator adds the future value of an initial investment and the future value of monthly contributions. The formula assumes regular contributions and a constant annual return, so it simplifies real market volatility.
Debt payoff
The debt payoff calculator uses monthly amortization to estimate how long it takes to clear a balance. If the monthly payment does not cover monthly interest, the tool warns that the debt will not decline.
Limitations
Results are educational estimates. Before signing a mortgage, refinancing debt, investing or making tax decisions, compare the numbers with official documents and a qualified professional.