Rep. Mark Meadows, R-N.C., chairman of the House Freedom Caucus, walks through Statuary Hall in the Capitol on Wednesday, March 22, 2017.

Proposals for a second part of the Republican tax-reform plan could be released as early as April 15, Rep. Mark Meadows said Monday.

Possible tweaks unveiled on Tax Day could include making individual tax cuts permanent or indexing capital gains for inflation, said the chairman of the conservative House Freedom Caucus.

"There's been real talks," the Republican from North Carolina added.

A rollout of additional tax changes this year would come as Republicans try to hold off Democratic momentum and keep a majority in the House. The GOP aims to use its tax plan passed in December as a midterm appeal to voters, but it has so far not shown conclusive results as a selling point.