This model IRS form is used by the employer to establish a SEP plan and define eligibility criteria for employees when deciding to offer a SEP plan for their employees. The form should be reviewed or updated every year.
The 5305-SEP form is used to establish the SEP plan and communicate the intent of the employers to offer SEP IRA plans to employees, but is not filed with the IRS and does not create an obligation for the employer to contribute.
Once the form has been filled out or modified the employer must make it available to all employees within 30 days per Department of Labor rules.
Within the form no contribution amount is defined. Even though it may be the intention of the employer to make a contribution to the employees they may choose to make no contribution for the calendar year.
You can find an example of the 5305-SEP form here: