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Last Updated: 11/8/2017

Interest Rate

​The 2018 interest rate is 4%.

If tax is paid late, interest is calculated from the regular due date and also applies to any penalties that are assessed on the unpaid tax.

The chart below shows the interest rates for the last 10 years.
 
Year​ ​Interest Assessed on Unpaid Taxes Interest Paid on Delayed Refunds​
2017​ 4% ​4%
2016​ ​3% ​3%
2015​ ​3% ​3%
​2014 ​3% ​3%
​2013 ​3% 3%
​2012 3%​ ​3%
​2011 3% 3%
​2010 3% 3%
​2009 ​5% 5%
2008​ 8% 8%