To find out how much you will be able to pay for your new home, you need to analyze your taxable income along with the amount of debt that you have to pay off through monthly payments. If it is your main residence that you are going to purchase, calculate approximately 32% of your income to make the mortgage payment, property taxes and heating costs.
Next, you need to calculate 40% of your taxable income and from that, deduct all of your other monthly payments such as car loans, credit card bills and other such debts. The lesser of these two calculations will be used to determine how much of your income may be used towards housing related payments, including your mortgage.
Apart from what the ratios tell you, you should make calculations of your own to determine how much you can afford. If the payment amount you are comfortable with is less than 32% of your income you may want to settle for the lower amount rather than stretch yourself financially. Make sure you take all other expenses into consideration too so that you can easily afford the basic luxuries.