Bird, do you have anything that supports your scholarly opinion?
From the SIMPLE, SEP, and SARSEP Answer Book (10th Ed)
QUOTE
Q 2:51 May an employer amend its plan each year to lengthen the service requirement for eligibility?
Yes. It should be noted, however, that if new employees are added to the workforce, the successive amendments are likely to result in prohibited discrimination under Code Section 408(k)(3). That may be so because the present employees who are highly compensated employees could not meet the eligibility requirements for new employees at the time the plan was originally established (see Q 2:53). Another way to achieve the same effect is to terminate the plan each year and establish a new plan. In either case, it might be prudent to seek written assurances from an attorney familiar with the Employee Retirement Income Security Act of 1974 (ERISA) or submit a request to the IRS for a private letter ruling on such a scheme. [Rev Rul 73-382, 1973-2 CB 134; Rev Rul 70-75, 1970-1 CB 94]
Note. Code Section 414(o) provides that the Secretary of the Treasury shall prescribe such regulations as may be necessary to prevent the avoidance of any employee benefit requirement listed in Code Section 414(m)(4) or 414(n)(3). Both of those subsections refer to SEPs.
The employer must provide a copy of the amendment and a clear explanation of the amendment's effect to employees. A failure to clearly explain the effect of the amendment may subject the plan to the full reporting and disclosure requirements of ERISA (see Qs 4:5, 4:15).