The White House just spent six months jamming a massive legislative package through Congress with almost no margin for error. Now comes the real challenge.

Because the deduction starts to phase out for single filers earning over $75,000 and married couples making over $150,000 — with full disqualification at incomes above $175,000 for individuals and $250,000 for couples — the Urban-Brookings Tax Policy Center projects that middle- and upper-middle-income households stand to gain the most.

The bill, ushered through Congress by Republican leadership and signed by Trump Friday, includes $4.5 trillion in tax cuts, slashes spending on Medicaid, and creates temporary tax deductions for overtime and tipped income. It includes $170 billion for immigrant detention and for new personnel for Immigration and Customs Enforcement.