It appears that mostly everyone gets it who had earned income as there was no real credit that occurred technically during the year....simply that the tax tables were lowered, and therefore people paid less in and ended up with a bigger check. That may account for what happened to you. However, you are able to take this credit, as long as you don't go over the threshold MAGI.
Here is more information on how it works.....
How much is the credit?
The maximum allowable credit is $400 for working individuals and up to $800 for married taxpayers filing joint returns. The credit is figured at a rate of 6.2% of earned income.
It will phase out for individual taxpayers with modified adjusted gross income over $75,000 or $150,000 for married couples filing jointly; the phase out is at 2%, which means taxpayers who earn more than those limits will still qualify for the credit but will not receive the full amount.
Since I already had money taken out of my paycheck, does that mean I can't claim the credit?
No. If you were paid a wage or salary by an employer, you saw a little more in your paycheck over the year because of the adjusted withholding tables. This means less money was withheld from your check. You did not actually receive any credit during the year.
A credit is a dollar-for-dollar reduction in your tax bill. When you calculate your tentative tax due, credits are applied to that tentative tax and reduce your overall tax bill. You can think of credits as an additional "payment" toward your tax due. So, in this case, a $400 Making Work Pay credit will reduce your tax bill by $400.
It's not a windfall, however.
The purpose of the credit is to offset the reduced federal withholding you paid in over the year with the adjusted tables. If you qualify for the full Making Work Pay credit (and most taxpayers should qualify), you should end up with no difference at the end of the tax year. The tax rates did not change -- you just paid in less.
http://www.walletpop.com/blog/2010/02/19/are-you-eligible-for-the-making-work-pay-tax-credit/and here's more to reiterate and clarify:
BANKRATE'S 2010 TAX GUIDE
TAXES
Claiming the Making Work Pay creditBy Kay Bell • Bankrate.com
TAX TIP No. 12
Most workers saw a bit more in their paychecks from April to December last year. The few extra dollars each pay period was courtesy of the Making Work Pay tax credit, which came to $400 per eligible individual or $800 if you're married and file a joint return.
Now that filing season has arrived, credit recipients will have to account for that money by filing a new form, Schedule M.
The IRS wants this new document if you file a long Form 1040 or the slightly shorter 1040A. Nonresident taxpayers who send in Form 1040NR also will use this new schedule. Folks who can use the shortest return, 1040EZ, will simply use a work sheet on the back of that form.
Schedule M also addresses the $250 sent last year to folks who receive various retirement benefits.
Why the extra work?
The goal of all this extra work is to reconcile the confusion taxpayers and employers encountered when the new credit and revised withholding tables went into effect last April.
Although most eligible workers effectively got the credit amount because Uncle Sam took less money from their paychecks, that's not the official credit claim. The IRS still wants every filer to fill out the new Schedule M.
Once you complete Schedule M, you'll transfer the dollar figure you come up with on line 14 of that document to either line 63 of Form 1040, line 40 of Form 1040A or line 60 of Form 1040NR. Form 1040EZ filers will take their work sheet calculation and enter it on the EZ's line 8.
All these lines on the various tax returns are in the section that records all your tax payments. This includes withholding amounts from your W-2s, certain 1099s and any estimated tax payments you made.
Essentially, at filing time the credit is treated as additional withholding that can increase your refund or reduce any tax you might owe.
Who might be affected?
Schedule M could benefit, or cost, some filers depending upon their personal tax circumstances.
If your employer didn't start using the new tables soon enough (or at all) and you had too much withheld, Schedule M will sort that out and make sure you get your full $400 credit for 2009.
Similarly, if your boss did reduce your withholding, but you're not eligible for the credit, that too will be taken into account on the new schedule.
This could happen if you can be claimed as a dependent on another taxpayer's return.
You also might have had too little collected under the revised payroll Making Work Pay tables if you and your spouse both work, each had your withholding reduced by $400, but your combined modified adjusted income, or MAGI, makes you ineligible for the credit.
The Making Work Pay amount is reduced for joint filers whose MAGI is between $150,000 and $190,000. Other taxpayers whose MAGI is more than $75,000 but less than $95,000 also won't get the full credit amount. If your adjusted income is greater than the maximum for your filing status, then you won't get any of the credit.
And self-employed folks who have no payroll withholding taken out of their earnings will be able to claim the credit on Schedule M if they didn't adjust their quarterly estimated tax payments to reflect the tax break.
Retirees, too
Schedule M also applies to the $250 payment to certain retirees that was authorized by the American Recovery and Reinvestment Act, otherwise known as the stimulus package, signed into law last February.
These checks went to persons who get any kind of Social Security benefit including retirement, survivors and disability benefits; Railroad Retirement payments; Veterans Administration, or VA, disability pensions; and most people who receive Supplemental Security Income, or SSI.
If in addition to the retiree check, you (or your spouse if you file jointly) worked and you paid less in withholding thanks to the Making Work Pay credit, you'll need to file Schedule M. That form will account for these two tax benefits, since your credit amount will be reduced by your $250 retiree payment.
http://www.bankrate.com/finance/taxes/claiming-the-making-work-pay-credit-1.aspx