Are shareholder loans to an S corporation used in calculating ownership basis?

Do loans made to an S-corp by a 55% and a 45% shareholder have to be considered in calculating % ownership basis?  Answered all the questions in Step-by-Step TurboTax for Business and was never asked about the loans; only if they had been repaid. But, I see there is a form for 1120S labeled, "Stock and Loan Basis Information Worksheet" that TT never asked me to fill out.