The main difference between authorized capital and issued capital is that issued capital is a part of authorized capital. While authorized capital is the maximum amount that a company is allowed to raise from public. Issued capital is the part of authorised capital that is offered to public for subscription.
Authorized stock is the max amount of shares that a company can issue. Generally, a company will not issue 100% of the authorized stock, so issued stock will be less than the authorized amount. Issued stock can be held by the company, held by employees, or held by the general public.
Authorized shares are the total number of shares a company can legally issue, while issued shares are the number the company has issued to date. The number of authorized and issued shares may be the same or different, in which case there would be more authorized than issued shares.
Authorized shares, or authorized stock, are simply a legally allowed maximum number of shares that a company can issue to investors. The number of authorized shares is specified in the company's articles of incorporation. You can also see the number in the capital accounts section on the balance sheet.