The number of wealthy Americans paying the individual alternative minimum tax could grow if a change in the House-passed Republican tax-and-spending package remains in place.

The 2017 GOP tax law slashed the number of taxpayers owing the AMT -- a regime meant to ensure the wealthiest pay a minimum tax rate -- from millions to about 200,000. The AMT has different rules and exemptions from the regular tax system. High-income earners pay whichever is highest, regular income taxes or the AMT.

The House legislation seeking to renew expiring parts of the 2017 tax law includes a last-minute amendment, moving the base year for calculating ...