“Incentive” used in a sentence

"The extra money for hardworking workers is an incentive for me to work hard" makes more sense seeing as an incentive doesn't necessarily apply to you as individual but to everyone.

“The extra money for hardworking employees is my incentive to work hard.”

This means "The thing that motivates me is that other people get money for working hard."

“The extra money is my incentive to work hard.”

This means that you are motivated to work hard by extra money.

Possessive determiners are not used all that often with 'incentive/s' (see these Google ngrams), but Collins gives one example sentence (though it's not totally clear whether the phrase 'their incentives' applies to the incentivisers or those so incentivised):

That way, their incentives will be provided through wealth rather than income at risk. Times, Sunday Times (2017)

So

• The extra money for hardworking employees is my incentive to work hard.

is totally acceptable; using '... an incentive for me to work hard' would of course suggest that there may well be other incentives involved.