The universal availability rules took effect in 1989.
House Committee Report on TRA '86 for IRC § 403, under the heading
Elective Deferrals, there is explained that (emphasis added)—
QUOTE
The bill provides a special coverage and nondiscrimination rule applicable to tax-sheltered annuity programs that permit elective deferrals. * * * Under the bill, a tax-sheltered annuity program that permits elective deferrals will be considered discriminatory with respect to those deferrals unless the opportunity to make elective deferrals is made available to all employees of the entity sponsoring the tax-sheltered annuity program.
Initial IRS guidance on the universal availability requirement was provided in Notice 89-23 (IRB 1989-8, February 21, 1989) (emphasis added):
QUOTE
If contributions to a 403(b) annuity plan may be made pursuant to a salary reduction agreement within the meaning of section 3121(a)(5)(D), the plan meets the nondiscrimination requirements applicable to such contributions only if each participant who elects to make salary reduction contributions may elect to reduce annually his or her salary by more than $200 and the opportunity to make such contributions is available to all employees on a basis that does not discriminate in favor of highly compensated employees.
An EE generally does not have an opportunity if he is not aware of it. Annual notice to all eligible employees is generally deemed sufficient by the Employee Plans Correction Units (EPCUs), at least EPCU closes its review if the ER explains that such notices are so provided. One of the questions on the EPCU compliance check questionnaires sent out with IRS Letter 1562-F re 403b universal availability asks: "5) Describe how the opportunity to make deferrals is communicated to employees to ensure that they are aware of their right to participate in the section 403(b) plan. If the method differes by groups of employees or if there are different hiring packages, explain that as well."
The EPCU follows up with Letter 1564-B (7-2007) when the responses from the ER suggest a possible failure of universal availability. EPCU gives the ER 240 days to correct by the ER making a 'lost opportunity cost" contribution for each EE equal to 1.5% of pay, or if less and calculated, 1/2 of the average of the deferral percentages by those that were in fact given the opportunity.