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How is my monthly mortgage payment calculated?

Financial Toolset Team5 min read

Your monthly mortgage payment consists of four main components, often called PITI: (1) Principal - the amount that goes toward paying down your loan balance, (2) Interest - the cost of borrowing mo...

How is my monthly mortgage payment calculated?

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How Is My Monthly Mortgage Payment Calculated?

Understanding how your monthly mortgage payment is calculated can empower you to make informed decisions when shopping for a home loan. Knowing what goes into this calculation helps you better evaluate loan offers and manage your budget effectively. Your mortgage payment typically includes more than just the loan repayment; it also covers property taxes and insurance. Let's break down the components and how they work together to form your monthly payment.

Core Components of a Monthly Mortgage Payment

Your monthly mortgage payment consists of four main components, often abbreviated as PITI:

  1. Principal: This is the amount you borrowed to purchase your home. Over time, your payments will gradually reduce this balance.

  2. Interest: The cost of borrowing money from the lender, calculated on your outstanding loan balance. Initially, a larger portion of your payment goes toward interest, but as the principal decreases, the interest portion reduces.

  3. Property Taxes: These are usually collected by your lender in monthly installments and held in an escrow account. The lender then pays your annual property tax bill on your behalf.

  4. Insurance: This includes homeowners insurance and possibly private mortgage insurance (PMI) if your down payment was less than 20%. Like taxes, insurance payments are often escrowed by the lender.

The Amortization Formula

The principal and interest portions of your mortgage payment are determined using an amortization formula. This formula ensures that your loan is completely paid off by the end of the term. Here’s the formula used in the United States:

[ c = \frac{rP(1+r)^{N}}{(1+r)^{N}-1} ]

Practical Example

To illustrate, consider a $350,000 loan with a 7% interest rate over 30 years:

  • Monthly interest rate: 0.00583 (0.07 divided by 12)
  • Total payments: 360 (30 years × 12 months)

Plugging these into the formula gives you a monthly payment focused on principal and interest.

For a more straightforward example, say you have a $200,000 loan at a 6.5% interest rate over 30 years. Using the formula, your monthly principal and interest payment would be approximately $1,264.14.

Adding Property Taxes and Insurance

While the formula gives you the principal and interest, your actual monthly payment will likely be higher once property taxes and insurance are added. Here's a breakdown using hypothetical numbers:

ComponentEstimated Monthly Cost
Principal & Interest$1,264.14
Property Taxes$300
Homeowners Insurance$100
PMI$70
Total$1,734.14

Common Mistakes and Considerations

Bottom Line

Your monthly mortgage payment is a combination of principal, interest, taxes, and insurance. Understanding each component can help you make better financial decisions and prepare you for the long-term commitment of a mortgage. Use the amortization formula or online calculators to experiment with different scenarios, ensuring you choose the mortgage that best fits your financial situation.

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Common questions about the How is my monthly mortgage payment calculated?

Your monthly mortgage payment consists of four main components, often called PITI: (1) Principal - the amount that goes toward paying down your loan balance, (2) Interest - the cost of borrowing mo...
How is my monthly mortgage payment calculated? | FinToolset