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Estimating the tax bill on tonight's $323 million Mega Millions jackpot

  • The $323 million Mega Millions jackpot is the 10th largest in the game's history.
  • Federal tax withholding on the $199.8 million lump sum would be nearly $50 million.

The Mega Millions jackpot has jumped to $323 million, after Tuesday's drawing failed to yield a winner for the top prize.

If the prize amount doesn't go up before the 11 p.m. ET drawing tonight, it will be the 10th largest Mega Millions jackpot (although, only the 29th largest in U.S. lottery history).

The most recent big Mega Millions win — $536 million in July 2016 — was the third-largest in the game's history, and the seventh-largest in U.S. history. It was the most ever awarded to a single Mega Millions winner, and the highest cash-value jackpot awarded to a single winner in a U.S. lottery.

Of course, if you are lucky enough to pick the winning combo, you won't walk away with the full amount.

Lottery site USAMega.com estimates the federal tax withholding on the $199.8 million lump sum would be nearly $50 million, and state taxes could knock out up to another $17.6 million (with New York the worst offender). Those figures are just the amounts withheld up front; your final tax burden is likely to be even higher.