Short answer
Monthly payments show cash burden but not necessarily economic cost. Principal builds wealth, term shifts cost and one-off payments can disappear from the advertised amount. RATIOXA therefore compares total impact and ending wealth.
Important variables
- Principal versus interest
- One-off payments
- Term and remaining balance
- Residual value or ending wealth
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Worked example
A €1,500 mortgage payment and €1,200 rent are not directly comparable if €600 of the mortgage payment builds equity and the renter invests their capital.
Break-even: What changes the result?
For pure consumption payments, the payment is closer to cost. Once ownership, balance or residual value exists, the comparison needs a balance-sheet perspective.
Common mistakes
- Equating cash flow and cost
- Counting principal twice as cost
- Omitting ending wealth
Terms in this guide
Sources & assumptions
- European Central Bank — Nominal and real interest rates (2026-08-17)
- RATIOXA — Methodology and formulas (2026-08-17)
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