I efiled my taxes today. I heard the stimulus money is going to be based on latest tax information that was filed. I would like to undo my taxes and hold it for 3 weeks.

[DoninGA]

Once a tax return has been e-filed it cannot be canceled, retrieved or changed.

For the stimulus - 

Are there income limits on checks? The amount of the checks would start to phaseout for those earning more than $75,000 ($150,000 for joint returns and $112,500 for heads of household). This is adjusted gross income (AGI), not taxable income - so before your standard or itemized deductions.

[VolvoGirl]

I saw….
The payments are expected to be $1,200 per adult for those with adjusted gross incomes of up to $75,000. The threshold for married couples is $150,000 – they are eligible for $2,400 and $500 per child.

The phase-out rate is $5 for every $100 above the threshold.
For example, for individuals earning $75,500, the check would be reduced to $1,175.
The benefit phases out entirely for those earning more than $99,000 ($146,500 for heads of household with one child and $198,000 for joint filers without children).