CO - Underpayment Interest Rates

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Colorado Underpayment Interest Rates

If payment of tax, or agreement to pay, is made within 30 days of notice of underpayment or nonpayment, then a rate 3% lower than what is shown below applies. This lower rate also applies when a tax underpayment or nonpayment is cured voluntarily without notification from the Department of Revenue


Year Qtr 1
1/01 - 3/31
Qtr 2
4/01 - 6/30
Qtr 3
7/01 - 9/30
Qtr 4
10/01 - 12/31
2013 6% 6% 6% 6%
2012 6% 6% 6% 6%
2011 6% 6% 6% 6%
2010 6% 6% 6% 6%
2009 8% 8% 8% 8%
2008 11% 11% 11% 11%
2007 11% 11% 11% 11%
2006 9% 9% 9% 9%
2005 7% 7% 7% 7%
2004 7% 7% 7% 7%


For more information, see Federal Underpayment Interest Rates, which includes federal rates as well as links to other states.

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