$4 trillion to keep in place for the next decade. I think that was from the CBO. However, here's some different takes:
http://www.politifact.com/truth-o-meter/statements/2009/jun/24/paul-krugman/bush-tax-cuts-health-care-probably/"The left-leaning Center on Budget and Policy Priorities agrees with Krugman. The center's 2009 report on the Bush tax cuts states:
"The 2001 and 2003 tax cuts added about $1.7 trillion to deficits between 2001 and 2008. Because they (were) financed by borrowing — which increases the national debt — this figure includes the extra interest costs resulting from that additional debt. This figure also includes the cost of 'patching' the Alternative Minimum Tax to keep the tax from hitting millions of upper-middle-class households, a problem the tax cuts helped cause. Over the next decade (2009-2018), making the tax cuts permanent would cost $4.4 trillion, assuming that the tax cuts remain deficit-financed."
http://www.newshounds.us/2010/03/22/cavuto_overlooks_bush_tax_cuts_to_scaremonger_about_health_care_bill.phpAs Media Matters noted, The CBO projected that George W Bush's 2001 Economic Growth and Tax Relief Reconciliation Act would "reduce projected total surpluses by approximately $1.35 trillion over the 2001-2011 period." The CBO estimated that bill, the tax cut bill, would cost $1.22 trillion in its first 10 years.