Earlier quoted context omitted.
When you get a new job, you fill out some forms that tells the government how much money to withhold from your paycheck based on your expected earnings, deductions, etc. Later, at the end of the year, you file your return of what you actually made, what your actual deductions were, etc. And then the government will either pay you if you paid too much or they will ask you to pay if you did not pay enough.
Thanks. Presumably such a person wouldn't need tax-return software? The system here in the UK is similar, except that "regular workers" don't file a tax return. Work-related deductions/additions (e.g. private health plans) are reported by the employer and are automatically accounted for. Non-work stuff like capital gains on personal property sales are mostly dealt with as part of the transaction.
Wrong. I did my first tax return by manually filling out the PDF form. Even though I only had a single income and was filing the EZ form, it took at least an hour or two. Then there were state taxes.