Our experience suggests mixing annual and monthly recurring giving options on the same page is not optimal. It adds another decision point which means another option for them to say no. Furthermore, it complicates the form.
We realize that some clients, however, already have an annual giving program and want to continue. Fortunately, it is possible to make any form with a monthly recurring giving option into an annual recurring giving option by adding some parameters to the URL.
The parameter to add is "Frequency=annual". Here is an example:
If you want to turn the recurring giving option on, add ";Sustainer=Yes" to the URL. Here is another example:
Note that both sets of parameters are case sensitive.