Welcome to Tax Watch, a new feature in The Hill’s Business & Economy newsletter focused on the fight over tax reform and the push to extend the 2017 Trump tax cuts this year.

Starting next week, lawmakers will be on the Hill for four weeks in a row as GOP committees meet to hash out the particulars of their tax cut and spending bill.

The extension of the 2017 Tax Cuts and Jobs Act (TCJA), which is the centerpiece of the legislation, won’t pose nearly as much of a challenge as how to incorporate the additional tax cuts that President Trump proposed while campaigning last year. They include getting rid of taxes on tips and overtime pay and creating a credit for family caregivers, among others.

Some reports suggest Republicans are considering sunsetting those proposals after a few years to limit the cost of the package.

However Republicans decide to handle them, legislative experts say that’s where their attention will be focused.

“The expiring stuff is expiring — that’s easy. The TCJA orphans — that’s not that hard to draft. Even the expansion of the child tax credit — the levers and the dials available there are pretty well known … But the president’s campaign proposals are the ones that require the most new intellectual capital,” Rohit Kumar, a former top aide to former Senate majority leader Mitch McConnell, told The Hill earlier this month.

—  Tobias Burns