Format a cell as DATE somewhere on the top of the sheet and enter 20th of
that month.

Then select the amount in the first row and click Conditional Formatting.
Select 'Formula Is' and enter 'Date Cell Reference' < today()
Then Click Pattern and the colour of your choice whether to change the Font
or the Cell.

Then copy the cell and select all the remaining amounts and Paste Special,
Formats

Though the above will work as you want, It won't make sense until you have a
'Date Paid' column.

"Nooshoos" wrote:

I have a spreadsheet that has the following:
Column 1 = Person's name
Column 2 = Amount due

I need cells to change colour if the amount due is not paid by the 20th of
the month. I have managed to figure out the date bit but unsure of what to
put for the value as the amount due for each person is different.

I hope this makes sense.

Any help would be greatly appreciated.