Hi, Tavis, > FSET _tax(x) (wkdaynum(x) == 1 && day(x) != 15) > REM OMITFUNC _tax Mon Tue Wed Thu 15 Apr AFTER CAL Tax Day That looks right and seems to match Wikipedia. I've updated the file in https://git.skoll.ca/Skollsoft-Public/Remind/commit/0fa8eed11f9d0a6500ace02a1da3f4c0a23a0a15 Thanks! Regards, Dianne.