The colours of the text in TaxCycle fields tell you something about the type of data.
Data entry fields (black text)
Blank until you type in them. After you type data in them, the text appears in black. If you want to show zeros in these fields when there is no data, change the setting in Display options.
Fields with carry forward data (purple text)
Contain values carried forward from a prior year. These field behave the same way as data entry fields. If you change the amount in the field, the purple text changes back to black.
Calculated fields (blue text)
Contain calculated amounts or values transferred from other forms. You can type in the field to override the calculated value (by pressing the F2 key). Many of these fields also contain jump links (F6 key) to direct you back to the source of value.
Fields with overrides (red text)
Show a red asterisk in the corner.
Non-edit fields (green text)
Contain calculated or transferred values that cannot be overridden.
Fields with imported data (italic text)
Contain values imported from DoxCycle. These field behave the same way as data entry fields. If you change the amount in the field, the italic will disappear.