Excel Tip: Estimating Mortgage Payments

With mortgage rates still hovering around historic lows, you might be wondering whether you can afford to purchase a new home or if you would benefit from refinancing your home mortgage.  Here is a quick way to use Excel to calculate what your new monthly payment would be.  Type this formula into any cell in an Excel spreadsheet to calculate the monthly payment (principal + interest) on a fully-amortizing mortgage loan.

=PMT(interest/12, term, balance)

  • interest = the annual interest rate, entered as a decimal
  • term = the loan term in months
  • balance = the loan balance, entered as negative

For example, for a 110-month loan at 6.5% with a balance of $405,000, you would enter:

=PMT(0.065/12, 110, -405000)

If you determine that your monthly savings from refinancing would be enough to justify the transaction costs, the next step is to determine if you qualify.  For most people that purchased their homes in the last decade, the biggest hurdle to refinancing is not having enough equity.  Fortunately, even people with little or no equity in their homes may still have a chance to refinance, particularly if their existing mortgage is being held by Fannie Mae or Freddie Mac.

If you would like some assistance in determining whether you might benefit from refinancing, or if you would like the name of a trustworthy mortgage professional who can help you explore your options, then your friends at Ghirardo CPA are ready to assist you.

Featured Client for June 2011 - Indian Valley Golf Club

Jeff McAndrew “Ghirardo CPA has been our CPA for many years...they consistently provide a high level of professional service for our businesses. Their staff is knowledgeable, prompt, and accurate. I have faith in their tax and accounting services for our local, family-owned business.“

-- Jeff McAndrew, General Manager Indian Valley Golf Club


At Ghirardo CPA, we pride ourselves on combining technical excellence with a passionate commitment to helping our clients achieve their goals. Let’s explore how we can be your partner in success. contact us

Featured Client for May 2011 - Buck’s Saw Service

Jeff Keegan & Mark Bailey

Ghirardo CPA provides us with fast, friendly, and reliable accounting and tax service. Their quality of work is excellent. Their streamlining suggestions have allowed me to spend more time working with my customers, not administration. My days are now much more pleasurable!”

--Jeff Keegan & Mark Bailey, Co-Owners, Buck’s Saw Service


Our commitment to helping our clients succeed is the cornerstone of our business. Let us know how we can assist you.

Featured Client for April 2011 - Marty Kropelnicki

Marty Kropelnicki "Excellent professional firm and a locally owned business.

They make my tax planning easy."

--Marty Kropelnicki, Finance Executive, Former CPA, Marin County resident.


We pride ourselves on combining technical excellence with a passionate commitment to helping our clients achieve their goals. Let’s explore how we can be your partner in success. contact us

Featured Client for March 2011 - Inn Marin & Rickey’s Restaurant

John Marshall “Ghirardo CPA team members are genuinely concerned for the success of our business. They handle our taxes and accounting and are vey professional and personable. Plus, their consulting capabilities are exceptional!”

--John Marshall, Proprietor, Inn Marin & Rickey’s Restaurant


Our commitment to helping our clients succeed is the cornerstone of our business. Let us know how we can assist you.