Interest and Penalties. In 2018, Paul, who is single, has a comfortable salary from his job as well as income from his investment portfolio. However, he is habitually late in filing his federal income tax return. He did not file his 2018 income tax return until December 4, 2019 (due date was April 15, 2019) and no extensions of time to file the return were filed. Below are amounts from his 2018 return:

Taxable income	$140,000
Total rax liability on taxable income	27,890
Total federal tax withheld from his salary	22,490

Paul sent a check with his return to the IRS for the balance due of $5,400. He is relieved that he has completed his filing requirement for 2018 and has met his financial obligation to the government for 2018. Has Paul met all of his financial obligations to the IRS for 2018? If not, what addi-tional amounts will Paul be liable to pay to the IRS?