usage of 'due' as an adjective

I am wondering if the adjective ‘‘due’’ could be used with the future tense to refer to a planned future event, for example:
‘‘My test result will be due next Friday.’’
or it is more appropriate to say
‘‘My test result is due next Friday.’’
Thanks for your clarification.

Hi and welcome to the site,

‘Will be due’ and ‘is due’ are both fine. There is a very small difference in that ‘will be’ is a little more emphatic and you would use that almost to remind yourself or the other person as in:

‘Remember that your tax payment will be due at the end of the month, so don’t forget’.

Hope that helps.