The amount called in respect of a share but not paid before or on the date fixed for payment is referred to as:

The amount called in respect of a share but not paid before or on the date fixed for payment is referred to as a "call in arrears". When a company issues shares, it may require shareholders to pay for them in installments. These installments are known as "calls" and the amount that is due but not paid on the due date is called a "call in arrears". For example, let's say a company issues 100 shares with a nominal value of $10 per share. The company may require shareholders to pay for the shares in two installments, with $5 due on the issue of the share and $5 due in six months' time. If a shareholder pays only $4 on the due date of the second installment, they would have a call in arrears of $1. It is important for companies to keep track of calls in arrears because they represent unpaid capital that the company is entitled to collect. The company can take legal action to recover the amount owed, or it may declare the shares forfeited if the shareholder fails to pay the amount due within a specified period of time. In summary, a call in arrears is the amount that a shareholder owes to a company for a share that has been issued but not fully paid for on the due date. It represents unpaid capital that the company is entitled to collect, and the company may take legal action or declare the shares forfeited if the shareholder fails to pay the amount due.