1. No, if you choose Married Filing Jointly, that is the same as the old Married Filing Jointly, not the one that allowed you to withhold at a higher rate
2. No, check 2c does not automatically deduct additional withholdings, you actually must do the calculations yourself then enter the additional amount you want withheld on line 4c.
Say you are making $101,000 and your wife is making $43,000. On the right of the table under Married Filing Jointly you will look at the column that says $100,000-$149,000 then at the top you will look for the row that say $40,000-$49,000 and find the point they intersect which in this example is $8,370.
You will enter the $8,370 on line 1 of your W4 page 3, then you will divide this number by the number of times per year you get paid. So if you get paid every other week, you would divide $8,370 by 26 for a total of $321.92. You would then enter the $321.92 as the amount you wanted for extra withholdings on Step 4c of your W2.
The purpose of this is so that you are taxed at the rate you should be with both incomes taken into consideration instead of just your income counted.
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