Assuming this question is regarding California Form 100S for an S-Corp, the number of shareholders on Line G flows to the California form from the federal Sch K-1 Wks.
Using Forms Mode in TurboTax Business, click on the first instance of Sch K-1 Wks in the left column. After the form opens, scroll down in the large window to Total number of shareholders... under Total number of K-1's. The number to the right should be in a blue font in a yellow box. This indicates that you can manually enter a number on this line. Be sure you have set up as many shareholders as the number you enter. Then check Form 100S Line G to be sure the number is corrected.
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Please clarify - are you working in the Federal version of Sch K-1 Wks or the one under California? You won't be able to change the number on the State version.
Your other option is to review your entries under Shareholder Information in the Step-by-Step section of Business Info. TurboTax should count the number of shareholders that you see under Shareholder Information Summary. If you have only one shareholder, you may not see this screen. You could try adding another shareholder, then deleting it to reset the calculation of number of shareholders.
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