If a time is fixed for payment of money due a county or a county retirement system, the debtor shall, if notified by the county treasurer at least thirty days before such time, pay interest thereon at the rate of eight per cent per annum from such fixed time until payment.
Mass. Gen. Laws ch. 35, § 24
Overdue accounts; interest charge
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.