I'll be doing the opposite. Since tax returns are essentially a zero-interest loan to the government (it's YOUR money you're getting back), I typically have way too little taken out of my paycheck. I think I pay something like $30 in federal off every paycheck, when it should be closer to $250, and I use a part of that freed up money to buy bitcoins every paycheck.
So, instead of using my tax return to buy bitcoins, I'll be using the bitcoins I have been buying over the year to pay my tax bill (since I obviously still owe more in taxes). Except those bitcoins, which have been bought with money that otherwise would've went to taxes, are now worth 3 to 4 times more. Yay for being a financial analyst!