diff --git a/extra/taxes/usa/usa-tests.factor b/extra/taxes/usa/usa-tests.factor
index a529762c81..002299fef1 100644
--- a/extra/taxes/usa/usa-tests.factor
+++ b/extra/taxes/usa/usa-tests.factor
@@ -1,6 +1,6 @@
 USING: kernel money tools.test
 taxes.usa taxes.usa.federal taxes.usa.mn
-taxes.utils taxes.usa.w4 usa-cities ;
+calendar taxes.usa.w4 usa-cities ;
 IN: taxes.usa.tests
 
 [
diff --git a/extra/taxes/utils/utils.factor b/extra/taxes/utils/utils.factor
deleted file mode 100644
index a5c2240625..0000000000
--- a/extra/taxes/utils/utils.factor
+++ /dev/null
@@ -1,10 +0,0 @@
-! Copyright (C) 2008 Doug Coleman.
-! See http://factorcode.org/license.txt for BSD license.
-USING: math ;
-IN: taxes.utils
-
-: monthly ( x -- y ) 12 / ;
-: semimonthly ( x -- y ) 24 / ;
-: biweekly ( x -- y ) 26 / ;
-: weekly ( x -- y ) 52 / ;
-: daily ( x -- y ) 360 / ;