About the Upfront vs Installments Comparator
Whenever we make a purchase, the question arises: 'Should I accept this small discount to pay cash upfront, or divide it and keep the money?'. This tool answers exactly that by calculating the Present Value and Opportunity Cost of your purchase. If the yield you earn by investing the money is greater than the interest rate hidden in the installments, it is worth paying in installments.
Perguntas Frequentes (FAQ)
What is Opportunity Cost?
It's what you miss out on by choosing one option over another. By depleting your capital (paying all at once), you lose the opportunity to let that same money earn compound interest in a safe investment during the installment term.
Does it always pay to use 'interest-free' installments?
Mathematically, yes! If the upfront price and the installment price are **exactly the same** (zero discount), you will always come out ahead by paying in installments. Inflation slowly erodes the real value of the installment, and the money you held back today will continue yielding returns.
What yield rate should I enter?
Use the net monthly rate (after taxes) of an accessible, highly liquid investment you already hold. Ordinary savings accounts often yield around ~0.5% a month, while government bonds and index funds might yield 0.7% to 1% depending on current central rates.
Important (Behavioral vs Mathematical)
This tool focuses purely on MATHEMATICS. But in personal finance, psychology matters heavily: if paying in installments makes you lose track of billing cycles and leads to debt, paying upfront might be the mentally safer choice even if theoretically less 'profitable'.