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Cost of Savings Index (GDW COSI): Historical Data
(no longer exists as an index)

The new index: Wachovia Cost of Savings Index (Wachovia COSI or W-COSI)

Since the merger of Wachovia and World Savings the Wachovia family of companies no longer uses the original COSI index for new mortgages. The original COSI index (a.k.a. GDW COSI or World Savings COSI) has been discontinued. The final COSI value {4.79} was released in September, 2007 for the month of August 2007.

Starting from August 1, 2007 Wachovia offers the new Wachovia Cost of Savings Index.

In October 2008 Wachovia discontinued providing updates to the new Wachovia Cost of Savings Index rate to the public. It is still being provided for existing customers though (until they are migrated over to a new index).

Starting from January 1, 2009, our ability to report and forecast the Wachovia Cost of Savings Index is limited.

About the COSI ~ Current Value ~ Historical Data Starting from January of 1990 ~ COSI Rate Forecast

Historical performance of the Cost of Savings Index (COSI) over the last 22 years.
Historical performance of the Cost of Savings Index (COSI) over the last 22 years.

The Cost of Savings Index Values Starting from January of 1984

 

1984 1985 1986 1987 1988 1989 1990
January 9.84 10.15 8.46 7.31 7.22 7.49 8.07
February 9.87 9.76 8.40 7.2 7.35 7.6 8.01
March 9.79 9.55 8.37 7.12 7.41 7.65 7.99
April 9.73 9.44 8.30 7.03 7.43 7.81 7.94
May 9.73 9.27 8.14 6.97 7.44 8.01 7.91
June 9.78 9.10 7.99 6.93 7.34 8.13 7.94
July 9.98 8.91 7.93 6.96 7.35 8.23 7.90
August 10.20 8.73 7.84 6.97 7.28 8.28 7.90
September 10.33 8.70 7.74 6.96 7.27 8.27 7.99
October 10.42 8.67 7.68 6.98 7.30 8.22 7.87
November 10.55 8.51 7.51 7.08 7.40 8.20 7.84
December 10.40 8.44 7.39 7.13 7.44 8.14 7.81
The Cost of Savings Index is calculated by using the weighted annualized average rate paid by World Savings on their checking and savings accounts.

Historical Data: Mortgage-X compiles historical values for the indexes which are widely used on adjustable rate mortgages (ARMs):

Mortgage Professionals Offering COSI-indexed Loans: If you are looking for a COSI-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.

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