Understanding and Controlling Your Finances

      Mortgage Ratio Calculator


      The maximum amount of money that a mortgage lender will allow you to borrow depends on two tests. The first test, which could be called the allowable monthly housing cost test, ensures that your monthly mortgage payments will not exceed 28% of your gross annual income. The second test, which could be called the allowable total monthly debt payment test, ensures that your total monthly payments for all debt including your mortgage payments do not exceed 36%. These ratios are good things because they help people to avoid overextending themselves. For example, if you bring home $2,000 per month and had to make a $1,500 mortgage payment each month, it is virtually guaranteed that you would either starve to death or default on your loan. The first test tries to prevent this from happening. In the same way, if you have a number of outstanding loans for cars, boats, furniture, etc. and tried to load another large loan on top of the pile, then it is also likely that you would eventually default. Test 2 guards against this problem.

      The first calculator on this page helps you to calculate your 28% and 36% ratios. Subsequent calculators help you to determine the monthly payment for your mortgage, the total monthly payment for the mortgage plus all additional expenses (you can then compare this number with the allowable monthly housing cost), and your total monthly debt payment (you can compare this number with the allowable total monthly debt payment).

      Head of Household Annual Income - Enter the gross annual income of the head of the household.
      Spouse's Annual Income - If you are married and your spouse works, enter your spouse's gross annual income. Otherwise enter 0.
      Click this button to calculate the ratios.
      Allowable monthly housing cost - Your monthly mortgage payment plus your property taxes, insurance, and any monthly maintenance fees (for town houses and condos) cannot exceed this number.
      Allowable total monthly debt payment - The total monthly payments on all existing loans plus your monthly mortgage payment plus your property taxes, insurance, and any monthly maintenance fees (for town houses and condos) cannot exceed this number.
      So, now that you know your limits, let's see how your borrowing needs fit into them. First we need to calculate the monthly payment for your loan. Use the calculator below to do this.
      Price of the house - Enter the total price of the home you plan on purchasing.
      Down Payment - Enter the down payment you plan to make on the house. 10% of the house price is a fairly standard figure if you are guessing.
      Interest rate- Enter the interest rate you expect to get for the loan. If you expect the rate to be 8.5%, enter 8.5 in the field. You should be able to find the current mortgage interest rate average for your area in the business section of your sunday paper.
      Duration - Enter either 15 or 30 in this field, depending on whether you are expecting to obtain a 15-year or a 30-year mortgage.
      Click this button to calculate the monthly payment for your mortgage.
      Monthly mortgage payment - This number represents the amount you can expect to pay each month for your mortgage.
      Now you know your monthly mortgage payment. You must add to this number insurance costs, city and county taxes, and any monthly fees. Doing this will give you your total monthly cost of owning a home. Use the calculator below to do this.
      Monthly Mortgage payment - Enter the monthly mortgage payment number calculated by the previous calculator.
      Annual Insurance Bill - Enter the amount you expect to pay each year for home-owner's insurance. If you have no idea enter 500.
      Tax Value of Home - Enter the tax value of your home. Generally (but not always) if will be roughly in line with the purchase price of the home. If you have no idea, use the purchase price.
      County tax rate - Enter your county tax rate. Tax rates are normally stated as "amount per $100 of valuation". So if the tax rate in your county is "$0.95 per $100" enter 0.95. If you have no idea, enter 1.00.
      City tax rate - Enter your city tax rate if your home is located inside the city limits. Tax rates are normally stated as "amount per $100 of valuation". So if the tax rate in your city is "$0.95 per $100" enter 0.95. If you have no idea, enter 1.00. If your house is outside the city limit and not subject to city taxes, enter 0.
      Maintenance fee - If you are contemplating moving into a condo or town home, enter the expected monthly maintenance fee. If you have no idea, enter 100.
      Private Mortgage Insurance (PMI) premium - If your down payment is less than 20% of the purchase price of the home, many lenders will require you to buy Private Mortgage Insurance. This insurance guarantees that the loan is repaid even if you go bankrupt or default on the loan. Enter the annual cost of this insurance here. If you have no idea enter 250.
      Click this button to calculate the total monthly cost of home ownership.
      Total Monthly Cost of home ownership - This number represents the amount you can expect to pay each month for your mortgage and all related expenses. This number must be less than the allowable monthly housing cost from the first calculator. If it is not, then you can either look for a less expensive home, hope interest rates fall, or increase the amount of the down payment.
      Now you know your Total Monthly Cost of home ownership. You must add to this number all other debt payments to determine your total monthly debt load. Use the calculator below to find your total monthly debt load.
      Total Monthly Cost of home ownership - Enter the Total Monthly Cost of home ownership number calculated by the previous calculator.
      Car Payments - Enter the total of all monthly car payments made by your household.
      Credit Card Payments - If you are carrying a balance on your credit cards, enter the total of all monthly credit card payments made by your household.
      Student Loans - Enter the total of all monthly student loan payments made by your household.
      Other loan payments - Enter the total of all other monthly loan payments made by your household.
      Click this button to calculate the total monthly cost of all debt.
      Total Monthly Cost of all debt - This number represents the amount you can expect to pay each month for all of your debts once you purchase your home. This number must be less than the allowable total monthly debt payment calculated by the first calculator. If it is not, then you can either look for a less expensive home, hope interest rates fall, or increase the amount of the down payment, or pay off some of your existing debts.
      If you look at all of these numbers and everything looks good, then congraulations! You are well on your way to home ownership. If you find that you are falling short, here are some things to try:
      • Reduce your expenses and debt - Several of the previous articles in this series talk about lowering your expenses. To buy a house you also need to reduce debt. You might be able to do this by selling your car (if you are driving a new one). You can then pay off its loan and eliminate the monthly payments. Buy a much less expensive used car to replace it.
      • Work to pay off other debt - Pay down all other existing loans (see other articles in this series for advice) to eliminate debt and monthly payments on it. Start saving the extra money this frees up each month.
      • Save a larger down payment - By saving a larger down payment you reduce the size of the mortgage you have to apply for. You may also be able to eliminate PMI if you can accumulate a 20% down payment.
      • Wait for interest rates to fall - If interest rates are relatively high, you may be able to wait a year for them to fall.

      • Return to originating article
      • Go to the series Introduction




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