Quarterly estimated taxes are payments you make throughout the year on income that doesn’t have taxes automatically withheld. If you’re a contractor, business owner, or self-employed in any capacity, nobody takes taxes out before you receive your money. The IRS still expects payment as you earn, not in one lump sum at filing time.

W-2 employees don’t think about this because employers handle it. Taxes come out of every paycheck automatically. By April, most of what’s owed has already been paid. When you work for yourself, that responsibility shifts to you.

The due dates are April 15, June 15, September 15, and January 15 of the following year. You owe payments to both the IRS and the Utah State Tax Commission. Federal payments use Form 1040-ES. Utah uses Form TC-546. Both can be paid online through their respective payment portals.

Calculating your quarterly amount can be done two ways. The safe harbor method is simpler. Pay at least 100% of last year’s total tax divided into four equal payments and you avoid underpayment penalties regardless of what you actually owe this year. If your adjusted gross income exceeded $150,000, the safe harbor increases to 110% of last year’s tax.

The other approach estimates your current year income and pays taxes on it as you go. This makes more sense when income varies significantly. For contractors and construction businesses, project timing can make one year look nothing like the next. A big payment in December might skew everything. Estimating based on current year profit gives you more accurate payments but requires better tracking throughout the year.

Miss a payment or pay less than you should and the IRS charges an underpayment penalty. The penalty is calculated on the amount you were short and how long you were short. The rate changes quarterly, typically running around 7-8% annually. Not devastating, but it adds up if you’re consistently behind.

Set aside money for taxes as income arrives. Many business owners use 25-30% as a starting point, though your actual rate depends on your tax bracket and deductions. Keep it in a separate savings account so the money is actually there when due dates arrive. Treating taxes as a fixed cost that gets funded first prevents the cash crunch that catches people every April.

The cleaner your books, the easier quarterly estimates become. When you know your actual profit rather than just your bank balance, you can calculate taxes from real numbers. Guessing leads to either overpaying and waiting months for a refund or underpaying and facing penalties plus a large balance due.

If quarterly taxes feel confusing or you’re never sure how much to set aside, that’s worth addressing. Contractors running jobs don’t have time to track every expense and calculate tax liabilities on top of everything else. Working with bookkeeping services in American Fork helps you understand your numbers so quarterly payments are based on actual profit data instead of rough estimates.