Vt. Stat. Ann. tit. 21, § 1337

If not later than three years after the date on which any contributions or interest thereon became due, an employer who has paid such contributions or interest thereon shall make application for an adjustment thereof in connection with subsequent contribution payments, or for a refund thereof because such adjustment cannot be made, and the Commissioner shall determine that such payments or any portion thereof were erroneously collected, the Commissioner shall allow such employer to make an adjustment thereof, without interest, in connection with subsequent payments by him or her, or if such adjustment cannot be made, shall refund said amount without interest from the fund. For like cause and within the same period, adjustment or refund may be so made on the Commissioner's own initiative.