Receipts from tax returns filed by the April 15 deadline were about 6 percent higher than such receipts last year, about what CBO anticipated when it prepared its most recent budget projections in March. Nevertheless, the federal government recorded a deficit of $151 billion for the first seven months of fiscal year 2008, CBO estimates—$70 billion more than the shortfall incurred in the same period last year. ... Because of the large inflow of tax payments due by April 15, the government runs a budget surplus in April. This year, that surplus was $160 billion, CBO estimates, or $17 billion less than the surplus recorded in the same month last year. That reduction was due to the effect of the calendar on the timing of certain outlays. ... Through April, withholding of income and payroll taxes rose by about $49 billion (or nearly 5 percent), reflecting continued increases in wages and salaries. Those receipts grew at a slower rate than the nearly 7 percent increase recorded in both 2006 and 2007. CBO: Monthly Budget Review