Let’s use some entirely fake, made up numbers.
Assume tax rates (except for the MWP credit) stayed the same in 2008 and 2009 and everything else stayed the same between the two years.
I will use the $400 per taxpayer number, not the $800 per married couple figure.
If we round off to 50 weeks, that’s $8 a week.
In 2008, let’s say they withheld $100 a week in income taxes from your pay. (And to make it easy, let’s say you worked 50 weeks, not 52 weeks.) At the end of the year, they have withheld $5000 in taxes. You fill out your Form 1040 and discover you only owed $4000 in taxes. You get a $1000 refund.
In 2009, they adjusted the withholding tables. Based on the same salary and the same W-4, they only withheld $92 a week from you. At the end of the year, they have withheld $4600. You fill out your Form 1040 and you discover that since you earned the same amount as last year, you owe $4000 in taxes. But you get to take the $400 MWP credit this year, that that reduces the amount that you owe for 2009 to $3600. So you get a $1000 refund ($4600 - $3600) just like last year.
Withholding is an inexact science because a lot of people don’t get the same exact amount every week or work every week, so it may not have worked out exactly even for everybody.
Now, let’s say you worked two jobs and they withheld $50 a week from each job during 2008. At the end of the year, you have paid $5000 in taxes again. You fill out Form 1040 and discover that you owed $4000. You get a $1000 refund.
Then in 2009, they make the changes to the withholding and withhold only $42 a week from each job. At the end of the year, you have paid $4200. You fill out your Form 1040 and again discover that your tax is $4000 and then you subtract the $400 MWP credit from that for a net tax of $3600. But this year you would only get a $600 refund ($4200 - $3600).
If your withholding was less than $8 a week, then yes, you would have had to wait until the end of the year to collect your full $400. But for most workers, it was passed out in $8 a week chunks.
Sorry, Ruken. You type faster than I do!
And the MWP credit was refundable, so it was possible to get back more than you had withheld.