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.
How much can you afford per month for house payments today? The main wildcard we haven't talked about yet is the realtor's best friend, the mortgage tax deduction. That's why I included the first year interest in the tables above. Going back to the median, let's say you purchase a home with a $200,000 mortgage at 5%.et's look at a $200,000 mortgage, a reasonable proxy for the average in the US. If you live in an state or a town with low property taxes, you can still expect to pay $2,000 a year above and beyond your mortgage.