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Skip the forecasting. Pay 90% of this year's tax or 100% of last year's (110% if last year's AGI topped $150,000) and the underpayment penalty cannot apply.

If you own a sole proprietorship, partnership or S corporation, you may be able to deduct up to 20% of your business profit. Above certain income levels, the rules get stricter.

Exercising ISOs creates no regular tax, but the spread counts as AMT income. Here is where the 2026 AMT starts, with a worked example.

Vested shares are wages. Many employers withhold a flat 22% on them, and if your bracket is higher, you pay the difference when you file.

Some tax moves expire on December 31. Others wait until the filing deadline. Here is how to sort them, with the 2026 limits and a worked example.

An extension moves the filing deadline to October 15. It never moved the payment deadline, and interest has run on any balance since April 15.

The state line runs through the Charlotte metro, and so does your tax bill. Here is how the two returns relate, and why neither state’s withholding settles the question on its own.

Depreciation is a deduction you take for years and a tax you meet once, at the sale. Knowing the size of that bill beforehand changes what you do first.

It is the part of a freelancer’s bill that nobody mentions until April, and it is not the same thing as income tax.

Half of this page points away from hiring me: the line is about whether your return contains decisions, not about what you earn.

The election trades self-employment tax on your profit for payroll filings, a second return, and a salary number you have to defend.

No safe harbor percentage, no 60/40 rule, no dollar floor: what exists is a published set of factors, a line of Tax Court cases, and a memo you write before the year starts.

The election is real money for a practice owner and mostly noise for a moonlighter, and the difference comes down to the Social Security wage base.

What a moonlighting dollar actually keeps, how to get the tax paid without a penalty, and why the solo 401(k) is smaller than the calculators promise.

Four payments, unequal windows, and one rule that keeps the penalty off your return even in a year when you write a large check in April.

Most IRS mail is a computer reporting that its records and your return disagree, and the code in the upper right corner tells you which kind of disagreement you have.

Most IRS mail is a computer comparing your return against documents it already had, which is a different problem than an audit and takes a different fix.

Most of these claims fail on the word exclusive, long before anyone gets to the arithmetic.

Engineering work sits close enough to the line that the same person can be a legitimate contractor on one project and an employee on the next.

A single filer with $120,000 of wages in 2025 sits in the 24% bracket and pays 14.9% of that income in federal tax, and both of those numbers are correct.

What the refund number actually measures, how withholding works now that allowances are gone, and how to change yours without walking into an underpayment penalty.

Three years is the default, four exceptions stretch it, and the records tied to an asset you still own follow a rule of their own.

Your old preparer's cooperation is helpful, not required, and nothing about the calendar says this has to wait until January.