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.
This looks at how much you make in proportion to how much the mortgage will cost you each month, including extras like private mortgage insurance, homeowners insurance and property taxes. Typically, lenders cap the mortgage at 28 percent of your monthly income.his looks at how much you make in proportion to how much the mortgage will cost you each month, including extras like private mortgage insurance, homeowners insurance and property taxes. Typically, lenders cap the mortgage at 28 percent of your monthly income.