By increasing the number of allowances on your W-4, you reduce the amount of tax being withheld.
This seems like an instant pay increase, but it isn't. Indeed, your checks will be bigger, but you have to be disciplined enough to put a portion (similar to what was originally being withheld) in an account. But if you choose an interest-bearing account, it's worth it.
This also sticks it to the government. When you normally withhold all that money every paycheck, it's like giving the government an interest free loan for which they make interest off of before you get that money back to pay taxes.
Basically, you are choosing to make interest off of your money instead of the government.
Again, to make this work, you need the discipline to set that money aside to pay income taxes. With online banking automated features, this becomes easy.
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