This is in keeping with recent seasons when the same arrangement has been struck by the two competing sides, the unlucky losers will walk away from Cardiff with in the region of £1.3m.
The game is dubbed as the richest in club football with a minimum of £30m at stake for the winners, but United chairman Ken Bates today confirmed that the losing team will not leave Cardiff empty-handed.
"We've agreed with Watford, as is tradition in this game, that because the winners get so much money the team that loses will keep the money from the final," said Bates.
"The worst case scenario is that we will walk away with £1.3m and that will be going on ground improvements. If we win it is a bonus."
And Bates also admits that United's current budget is based on a mid-table Championship finish and any cash made through the play-offs will represent an additional financial windfall.
"This season, we'd budgeted for finishing in mid-table and getting knocked out of both cups," added Bates.
"We budgeted to make £50,000 in both cups, we made £540,000. That's how to run the business, not expecting to win the Champions League every year."
The money generated through the play-off semi-finals goes into a central Football League pot with 50 per cent of the cash being distributed among all the Championship member clubs.
The participating clubs shared the remainder of the monies generated. But the final is a separate entity with over £1m at stake.