Default Value in Table

I need a default value in my table to be the date value of another field in
the table + 25 days. When I try to place this in the default value box, it
says there is a type mismatch.

="ANLDate" + 25

Both fields are short date format.

Any help is greatly appreciated.

When you use ="ANLDate" + 25 you are trying to add a number to a text string
and that don't work. It would be =[ANLDate] + 25 but that will not work as
the default is used when a new record is created and [ANLDate] is null upon
creation of a new record.

There is no reason to store the calculation as you can always do it in a
query or report.