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The formula underlined works perfectly when there is a date in the relevent cell. When their is no date (data) it returns a error.
Ive had a go at trying to figure it out below.
=DATE(YEAR([Invoiced Date]2), MONTH([Invoiced Date]2) + 1, 20)
=DATE(YEAR,IFERROR([Invoiced Date]3),""), MONTH,IFERROR([Invoiced Date]3),"-"), + 1, 20)