Housing · General financial education

Mortgage mechanics

With a repayment (amortising) mortgage you usually pay an instalment that contains interest and principal. Early on the interest share is often higher; later the principal share rises.

In more detail

If the rate is fixed, the payment can look constant while the mix inside it shifts: less interest on a falling balance, more principal. Extra repayments reduce the balance, if the contract allows it. Finmon names no bank.

Background

The end of a fixed-rate period, variable rates and interest-only structures (interest only, balance stays) are different models, not quality scores. Fees and insurance packs do not sit in the pure annuity formula. The loan calculator in Finmon is a scenario, not an offer.

An example

The same sum in the calculator over 10 and over 25 years: the longer variant often shows the smaller payment and the higher total interest: a model, not a bank branch.

A common misconception

The mortgage payment is pure principal, or a bank product from the app.

The payment mixes interest and principal. Finmon does not offer loans.

Source: CFPB · Loan options. Last reviewed: 2026-11-09. Editorially reviewed on 2026-11-09. Next review 2027-11-09. Version 0.2.0. Finmon explains. It does not advise. Not investment, tax or legal advice.