Increasing w-4 allowances will the net pay in your paycheck and your total tax burden.

The answer is Increase and Decrease
W-4 allowance is deducted directly from the total of your salary by the employers.This means that the amount of money that you could take home will be reduced.
Since the employers now in the possession fo a certain percentage of your income, the tax burden is now no longer in your hands, which will reduce your amount of tax payment.