Dionne Warwick -- $1.2 Million Break in Unpaid Tax Case

It might be the first time the United States has ever admitted it was wrong -- after mistakenly accusing Whitney Houston's cousin Dionne Warwick of owing more than $2 million in back taxes -- and TMZ has proof of the apology.

Uncle Sam filed a federal tax lien against Dionne back in 2009, claiming the singer owed $2.2 million in unpaid taxes from the 90s -- but THE UNITED STATES OF AMERICA WAS WRONG.

The IRS just filed new docs admitting it too, officially revoking its claim that Dionne owes the government the massive $2.2 million sum.

According to the IRS, it made an accounting mistake -- and Warwick now only owes just under one million.