Clinton was president until January 20, 2001. You're technically correct but wrong about who signed the bill:
The Economic Growth and Tax Relief Reconciliation Act of 2001 was passed and signed on June 7, 2001. The Act cut tax rates, and it also included a rebate of fiscal year 2000 taxes of up to $300 for single taxpayers, $500 for single taxpayers with dependents, and $600 for married couples.
Clinton was president until January 20, 2001. You're technically correct but wrong about who signed the bill: