Letâs look at a hypothetical spontaneous chemical reaction: The quantity of usable energy (chemical potential) in a reaction is called the Gibbs Free Energy (DG). DG is the difference between the energy contained in the products of a reaction and the reactants: DG = (energy of products) - (energy of reactants)
That's why some financial experts feel it's more realistic to think in terms of your net income, aka take-home pay, and that you shouldn't use any more than 25% of your take-home on your mortgage payment.
What percentage of your net income should go towards a home mortgage? Lets say you have $5000 coming in per month, how much is a safe amount to spend on a mortgage, while still saving some for car payments, other loans, insurance, groceries, emergencies, etc? My dad said a 1/4 of your net income is a good idea per month to spend on your home payments...agree? disagree?