Massachusetts recently published an update to Technical Information Release (TIR) 18-3, Interest on Overpayments and Underpayments. These interest rates relate to overpayments and underpayments of certain tax types, including withholding tax. These rates are published on a quarterly basis.
The interest rates have increased by one percent (1%) for the Second Quarter of 2018: interest on overpayments is now 4%, and interest on underpayments is now 6%.
To review TIR 18-3 in full, please click here.