House Democrats are willing to consider ways to fix errors in the Republican tax law, but any changes are likely subject to “heavy negotiation” between the two political parties, the House Ways and Means Committee’s chief tax counsel said.

Democrats are hesitant to fix drafting mistakes in a law that they weren’t involved in writing or passing, Andrew Grossman, the top tax lawyer for the panel’s Democrats, said at a Jan. 29 tax conference in Washington.

One error prevents retailers and restaurants, including Target and KFC-owner Yum! Brands, from writing off renovation costs immediately. Attorneys also have expressed...