List of current and historical rates
| Effective Date | Monthly Interest Rate | Annual Interest Rate |
|---|---|---|
| February 1, 2023 | 1.02% | 12.99% |
| February 1, 2022 | 0.82% | 10.27% |
| February 1, 2021 | 0.83% | 10.39% |
| February 1, 2020 | 0.95% | 11.97% |
| February 1, 2019 | 0.99% | 12.53% |
| February 1, 2018 | 0.90% | 11.40% |
| February 1, 2017 | 0.86% | 10.83% |
| February 1, 2016 | 0.85% | 10.69% |
| February 1, 2015 | 0.83% | 10.46% |
Pursuant to 220 C.M.R. 26.10(4), the late payment charge shall be calculated at an annual rate of interest which is the equivalent of the rate paid on two-year United States Treasury notes for the preceding 12 months ending December 31 of any year, plus 10%, i.e. 1000 basis points.