
128 Mich. App. 196 (1983)
339 N.W.2d 871
PRODUCTION CREDIT ASSOCIATION OF LANSING
v.
DEPARTMENT OF TREASURY
Docket No. 66162.
Michigan Court of Appeals.
Decided August 17, 1983.
Dickinson, Wright, Moon, Van Dusen & Freeman *197 (by Peter S. Sheldon and Anthony Ilardi, Jr.), for petitioner.
Frank J. Kelley, Attorney General, Louis J. Caruso, Solicitor General, Richard R. Roesch and Charles E. Liken, Assistants Attorney General, for respondent.
Before: MacKENZIE, P.J., and M.J. KELLY and S. EVERETT,[*] JJ.
S. EVERETT, J.
Petitioner has appealed from the order of the Tax Tribunal affirming the determination and redetermination by respondent that there was a deficiency in petitioner's franchise fee liability for the years 1975 and 1976. The sole issue presented is what is the proper method for determining a reserve for losses through loans made in the course of petitioner's business. Such a reserve may be subtracted from the surplus in determining the proper franchise fee tax.
Both parties agree that petitioner is entitled to such a reserve. It is the method of determining it which is in dispute. By federal law, petitioner must create a reserve equal to three and one-half (3-1/2) percent of its loans. The petitioner contends that this is the appropriate reserve. Respondent, however, claims that the proper reserve is one which it employs for all similar transactions. It takes the loss for the tax year, and the four years preceding this, and limits the reserve to the average of such actual losses.
We start on the premise that the longstanding interpretation of a statute by those charged with the duty of executing it is entitled to the most respectful consideration and ought not to be overruled *198 without cogent reasons. Margreta v Ambassador Steel Co, 380 Mich 513, 519; 158 NW2d 473 (1968).
It appears that the interpretation complained of has been in effect for more than half a century, and has never before been challenged. Basically, appellant contends that federal legislation requiring a fixed amount to be maintained as a loss reserve is determinative of the issue and binding on the states. No authority for this proposition is cited, nor does it appear to us to be a valid one.
The method used by the Department of Treasury is uniform. It takes into account the necessity, in certain types of commercial activity, for a reserve for future losses. Its determination of the amount of such reserve to be subtracted from surplus seems logical and realistic. Actually, in a given five-year span, the amount determined by the Department of Treasury could be greater than that required by federal law. We do not find cogent reasons for reversing the administrative determination and redetermination, and therefore affirm the decision of the Tax Tribunal.
Affirmed.
NOTES
[*]  Circuit judge, sitting on the Court of Appeals by assignment.
