Boston residents can use online mortgage calculators to estimate their monthly mortgage payments, including taxes and insurance, by following these steps:

1. Find a reliable online mortgage calculator. There are several websites that offer free mortgage calculators, such as Bankrate (https://www.bankrate.com/calculators/mortgages/mortgage-calculator.aspx) and Zillow (https://www.zillow.com/mortgage-calculator/).
2. Enter the necessary information. The calculator will typically ask for details such as the loan amount, interest rate, loan term, and down payment amount.
3. Include taxes and insurance. To estimate the complete monthly payment, including taxes and insurance, look for options to input property taxes and insurance costs. These fields may be labeled differently depending on the calculator, but they are usually present.
4. Provide information specific to Boston. Some mortgage calculators may ask for additional details related to the location, such as the property's zip code or the estimated annual property tax rate specific to Boston. This helps in accurately estimating the tax and insurance components of the monthly payment.
5. Calculate the monthly payment. Once all the necessary information is entered, click on the "Calculate" or "Estimate" button to generate the monthly payment amount.

For example, let's say a Boston resident is looking to purchase a home with a loan amount of $300,000, an interest rate of 3.5%, a loan term of 30 years, and a down payment of 20%. They can use an online mortgage calculator to estimate their monthly payment, including taxes and insurance.

If the property's zip code is 02108 and the estimated annual property tax rate is 1.2%, they would enter these additional details into the calculator. The calculator will then provide an estimate of the monthly payment, taking into account the principal, interest, taxes, and insurance.

It's important to note that online mortgage calculators provide estimates and may not include all the factors that affect the actual monthly payment. It's always a good idea to consult with a mortgage professional or lender for more accurate and personalized information.

References:

• Bankrate Mortgage Calculator: https://www.bankrate.com/calculators/mortgages/mortgage-calculator.aspx
• Zillow Mortgage Calculator: https://www.zillow.com/mortgage-calculator/