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Monthly ARM Indexes: MTA - Moving Treasury Average (aka 12-MAT), 1991-present

MTA (aka 12-MAT) is an index used to govern changes in certain Adjustable Rate Mortgages (ARMs), notably Option and FlexPay-style ARMs which feature monthly adjustment periods. MTA stands for "Moving Treasury Average".

The MTA, sometimes called MAT or 12-MAT, is a "derived" ARM index. It is produced by adding together other published index values and dividing the sum by the number of entries to produce a final single value.

To produce the monthly value for the MAT, a lender will add the last twelve monthly values of the one-year US Treasury Constant Maturity (not Treasury "bill") and divide the total by 12 (entries). The result is the new index value.

To that value, the lender will add a markup, called a "margin", and the sum of the two becomes your loan's new interest rate. For Option and FlexPay ARMs, the margin is typically 250 basis points (2.5%). Different lenders may use larger or smaller margins.

Since a "moving average" series could use any number of Treasury values, some lenders identify the MTA as 12-MAT (their own shorthand for 12-month moving average of the one-year Treasury).

Because it is a moving average, the MTA isn't as volatile as the index it is derived from (see this chart for a graphic demonstration). This can work to your advantage when interest rates are rising, but when rates are falling, the moving average will prevent your mortgage rate from falling rapidly.

Indexes comparable to the MTA include the 11th District Cost of Funds (COFI) and COSI, the cost-of-savings index produced by Wells Fargo Bank, the successor to an earlier index produced by Wachovia and Golden West Financial (World Savings).

ARM Indexes: MTA - Moving Treasury Average, aka 12-MAT from Jul 2015 to Jul 2016

See Graph
Index Month
MTA - Moving Treasury Average, aka 12-MAT
Jul-2015
0.19833
Aug-2015
0.22083
Sep-2015
0.24250
Oct-2015
0.25583
Nov-2015
0.28500
Dec-2015
0.32167
Jan-2016
0.35000
Feb-2016
0.37583
Mar-2016
0.41000
Apr-2016
0.43750
May-2016
0.46667
Jun-2016
0.48917
Jul-2016
0.50667

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