If you are on a monthly plan, you will be billed .50 cents for each document over your limit (up to the next tier amount) Once you hit the next tier amount — which differs per plan — you will need to upgrade to that or a higher tier in order to continue adding documents. For an annual plan, there are no overages. Once you hit your document limit, you will be provided an option to renew your plan early OR switch to a monthly plan. Note, you can always go back to an annual plan at any time.