MTA - 12-Month Treasury Average Index - Mortgage (ARM) Indices

The Monthly Treasury Average, also known as 12-Month Moving Average Treasury index (MAT) is a relatively new ARM index. This index is the 12 month average of the monthly average yields of U.S. Treasury securities adjusted to a constant maturity of one year. It is calculated* by averaging the previous 12 monthly values of the 1-Year CMT.

* The MTA Index is calculated by us monthly at or about 7:00 PM on the last business day of each month using the reported Treasury Yield Curve Rates and is usually published on our website by the first business day of the following month. We calculate the average by adding the 12 most recently published monthly yields together, dividing the result by 12 and rounding it to the nearest 10,000th of one percentage point.

Because this index is an annual average, it is more steady than the 1-Year CMT index. The MTA and CODI indexes generally fluctuates slightly more than the 11th District COFI, although its movements track each other very closely, as illustrated on our historical graph.

MTA [or MAT] vs. 1-Yr CMT, 11th District COFI, CODI, 1990-2009
MTA vs. 1-Yr CMT, 11th District COFI, CODI, 1990-2009 { Obtaining Permission to Reproduce }

The MTA and COFI-indexed ARMs work much the same way. ARMs tied to the MTA index may have the potential for negative amortization (like those tied to the 11th District COFI). The MTA is the most widely used Option ARM loan index.

Historical Data: Mortgage-X compiles historical values for the indexes which are widely used on adjustable rate mortgages (ARMs). Click here for a history of the MTA index. See also: historical performance of the MTA index over the last 50 years.

Mortgage Professionals Offering MTA-indexed Loans: If you are looking for an MTA-indexed ARM and need more information or advice, we invite you to take advantage of our database of the most competitive lenders available. Just complete a short loan request form and the best lenders in your local area will contact you with their rates and fees.

Note: The MTA index is also sometimes referred to as the 12-Month Moving Average Treasury (MAT).

MTA: Frequently Asked Questions

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