Yearly charges would depend on whether you set up a company in Delaware or Wyoming.
For the registered agent service, it will be a $99/year subscription.
To have a US business address which is mandatory to form a company in the US, we offer Firstbase Mailroom subscription for $35/month as an online mail service manageable from anywhere!
For Delaware, you will be required to pay the franchise fee. The Franchise Tax for a Delaware LLC is a flat annual rate of $300. The Franchise Tax for a corporation is based on your corporation type and the number of authorized shares your company has -- your registered agent will be able to calculate this fee for you.
In Wyoming, there is an Annual Report License Tax of $50 to keep your company's license.
Please note that there may be other fees associated with maintaining your business depending on the industry, employment status, number of employees, etc., so please consult with a lawyer or tax specialist for further information about your unique business needs.
Please check the pricing page for further information on Firstbase agent and Firstbase Mailroom.