29 CFR § 452.87 - Dues paid by checkoff.
A member in good standing whose dues are checked off by his employer pursuant to his voluntary authorization provided for in a collective bargaining agreement may not be disqualified from voting by reason of alleged delay or default in the payment of dues. For example, the constitution and bylaws of a labor organization call for suspension of members whose dues are three months in arrears. Dues to be paid directly by a member are two months in arrears when the union changes to a checkoff system. The member may not be denied the right to vote merely because the employer is late in submitting the checked off dues for the first month. It would not be inconsistent with the Act, however, for a union to require a new member who executes a checkoff authorization to pay one month's dues in advance on the date he becomes a member in order to be in good standing for the current month.
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