With no one hitting the Mega Millions jackpot Tuesday night, the prize has climbed to $422 million. If you win big in Friday night’s drawing, you should be prepared to field an onslaught of requests for a piece of the bounty. While it can feel good to share your newfound wealth, doing so also can eat up more of your windfall than anticipated. “Some people give away too much money to family and friends, and they do it to a point that it damages their own life goals,” said certified financial planner Jim Shagawat, president of Windfall Wealth Advisors in Paramus, New Jersey. “When the gifting starts, it’s difficult to stop.”

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For starters, remember that you won’t really have the advertised amount once you pay taxes on your winnings. The winner gets to choose between taking an immediate lump sum or receiving annual payments over 30 years. Either way, Uncle Sam will shave 25 percent off your check (or checks). For example, if you chose the lump sum option of $254 million, the Internal Revenue Service would take $63.7 million of it, leaving you with $191.1 million. On top that, you face state taxes unless you live in one of a handful of places where lottery wins are tax-free. In states that do take a piece, the range is from a high of 8.82 percent in New York to a low of 2.9 percent in North Dakota, according to lottery site USAMega.com.

Largest Mega Millions jackpots Rank Amount Date Number of winning tickets Where tickets were bought 1 $656 million 3/30/2012 3 Kansas, Illinois, Maryland 2 $648 million 12/17/2013 2 California, Georgia 3 $536 million 7/8/2016 1 Indiana 4 $533 million 3/30/2018 1 New Jersey 5 $522 million 7/24/2018 1 California 6 $451 million 1/5/2018 1 Florida 7 $414 million 3/18/2014 2 Forida, Maryland 8 $393 million 8/11/2017 1 Illinois 9 $390 million 3/6/2007 2 Georgia, New Jersey 10 $380 million 1/4/2011 2 Idaho, Washington

Your final tax bill to both your state and the IRS could also be much higher, depending on your individual situation. Of course, you'll still be far wealthier than you were before winning. To protect the amount remaining after taxes, you should create a financial plan to ensure the winnings last and allow you to meet your life goals. Part of that means knowing how to say no.

Appoint a gatekeeper

The first thing you should do when you win is assemble a team of experienced professionals, including an accountant, a financial advisor and an attorney (this should be your first call). One of those pros should be your gatekeeper for all requests for money, whether from family, friends or others. The more people who know about your newfound wealth, the greater the chance you’ll be approached. This means you should maintain your anonymity if possible, which is easier in some states than others. More from Personal Finance:

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Several states file suit against federal government over new tax law Either way, having a gatekeeper to screen all requests and fend off outstretched palms can ease any pressure or guilt that could lead you to making foolish financial decisions. “I tell clients to tell all of their friends and relatives that they can’t make any donations, gifts or investments without running it by me as their advisor,” said Jason Kurland, a partner at Rivkin Radler, a law firm in Uniondale, New York.

The big no-no's

Shagawat advises clients not to cosign a loan. While your wealth may enable a family member or friend to qualify for, say, a loan on a pricey car, you have to assume you’ll eventually be on the hook for it. Basically, if the person couldn't qualify for financing on their own, there's a good chance they won't be able to keep up with the payments.