AUBURN NATIONAL BANCORPORATION, INC

In addition to results presented in accordance with U.S. generally accepted

accounting principles (GAAP), this quarterly

report on Form 10-Q includes certain designated net interest income

amounts presented on a tax-equivalent basis, a non-

GAAP financial measure, including the presentation and calculation

of the efficiency ratio.

The Company believes the presentation of net interest income on a tax-equivalent

basis provides comparability of net

interest income from both taxable and tax-exempt sources and facilitates comparability

within the industry. Although

the

Company believes these non-GAAP financial measures enhance investors’

understanding of its business and performance,

these non-GAAP financial measures should not be considered an alternative

to GAAP.

The reconciliations

of these non-

GAAP financial measures to their most directly comparable GAAP financial measures

are presented below.

Second

First

Fourth

Third

Second

Quarter

Quarter

Quarter

Quarter

Quarter

$

7,344

7,045

6,969

6,790

6,709

Tax-equivalent adjustment

Net interest income (Tax

-equivalent)

$

7,363

7,062

6,988

6,811

6,728

$

14,389

13,366

Tax-equivalent adjustment

Net interest income (Tax

-equivalent)

$

14,425

13,405

Table 2

• Selected Quarterly Financial Data