What is Tax Liability?
Definition Tax liability is the total amount of tax you owe for the year based on your taxable income, before subtracting payments already made through withholding and estimates. Credits reduce this liability directly, while payments and withholding are applied against it to determine your final balance due or refund. It is distinct from the amount you write a check for at filing.
Distinguishing total liability from the balance due helps clients understand where their tax actually comes from and where planning can reduce it.