General 11: Colorado Civil Tax Penalties and Interest

year to year, it may be necessary to use multiple rates to calculate interest due. For example, if the tax was due April 15, 2016, but was not paid until October 1, 2017, the interest rate for 2016 will be used to calculate the interest accrued from April 15, 2016 to December 31, 2016 and the interest rate for 2017 will be ................
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