Quarterly Estimated Taxes for the Self-Employed: A Guide for Consultants, Fractional Execs and Coaches

Short answer: Self-employed professionals, including independent consultants, fractional executives, coaches, freelancers and other 1099 contractors, pay federal income tax and self-employment tax through four estimated payments a year, due April 15, June 15, September 15 and January 15. The simplest way to avoid penalties is the safe harbor rule: pay 100% of last year's total tax in four equal parts, or 110% if your adjusted gross income was over $150,000. Software that tracks income as it arrives, like Sumly, can calculate the right number before each deadline.

Who has to pay quarterly estimated taxes?

If you expect to owe $1,000 or more in federal tax for the year after withholding and credits, the IRS expects estimated payments. For most self-employed people on 1099 income, whether you are a consultant, fractional exec, coach or sole proprietor, that is everyone: no client withholds tax for you. It is also one of the most common reasons people come to Sumly: almost half of new Sumly users say simplifying quarterly tax payments is one of their goals. Most states with an income tax have their own estimated payments too.

When are quarterly taxes due?

The four "quarters" are not equal, which catches many people out:

When a date falls on a weekend or holiday, the deadline moves to the next business day. The next payment for 2026 income is due January 15, 2027.

How much should a self-employed person pay each quarter?

You have two reliable ways to set the number.

Safe harbor, the simplest option. Take last year's total tax from your return, multiply by 100%, or 110% if last year's AGI was over $150,000, and split it into four equal payments. Pay that, and you avoid the underpayment penalty even if you earn more this year. You settle any difference when you file.

Current-year estimate, the most accurate option. Estimate this year's net profit, calculate income tax plus self-employment tax, and pay at least 90% of that total across the four deadlines.

Worked example. A fractional CMO's total tax last year was $32,000 and her AGI was above $150,000. Her safe harbor target is $32,000 × 110% = $35,200, or $8,800 a quarter. If her income jumps this year, she still avoids penalties as long as those four payments arrive on time.

Want your own number? The free Sumly Quarterly Tax Calculator estimates your next payment in about two minutes.

What goes into a self-employed tax estimate?

Self-employment tax: 15.3% on 92.35% of your net earnings, covering both halves of Social Security and Medicare. The Social Security part stops at the annual wage base.

Federal income tax: on your total taxable income, after business expenses and deductions such as half of your self-employment tax and qualifying retirement contributions.

State income tax: in most states, paid on its own quarterly schedule.

Your net profit drives all three, which is why accurate bookkeeping is the foundation of an accurate estimate. Every missed business expense raises your tax bill.

What if my self-employed income is uneven?

Uneven income is common: more than 70% of Sumly users have uneven income from month to month. For consultants and fractional execs it is a big retainer in March and a slow summer; for coaches, a busy January and a quiet August. Two options help:

• Use safe harbor and ignore the swings. The payments stay the same whatever you earn.
• Use the annualized income method, Form 2210 Schedule AI, which lets you pay less in quarters where you earned less. It takes more calculation, so it is worth it mainly when income is heavily back-loaded.

A simple habit keeps either approach painless: move 20% to 30% of every client payment into a separate tax savings account the day it lands.

How do I pay estimated taxes?

Pay federal estimates online through IRS Direct Pay, your IRS online account or EFTPS, and choose "estimated tax" (Form 1040-ES) for the right year. Keep the confirmation number. Your state has its own payment portal.

What happens if I miss a payment?

The IRS charges an underpayment penalty, calculated like interest on the amount that was late, for the time it was late. Paying late is better than not paying: the penalty stops growing once the payment arrives.

Which tools help self-employed people plan for quarterly taxes?

Frequently asked questions

Do I have to pay quarterly taxes in my first year of self-employment?

Yes, if you expect to owe $1,000 or more. If you had no tax liability last year and were a US citizen or resident for the full year, you may not owe a penalty for the first year, but paying estimates still avoids a large bill in April.

Can I pay all four quarters at once?

You can pay early at any time. Paying the full year's estimate by April 15 meets every deadline.

Does a fractional executive with an S-Corp still pay quarterly taxes?

Salary paid through S-Corp payroll has tax withheld, but distributions do not, so many S-Corp owners still make estimated payments.

What is the penalty for underpaying estimated taxes?

It is calculated on each late or short payment, based on the IRS interest rate and how long the amount was unpaid. Safe harbor payments avoid it entirely.

How much should I set aside for taxes as a consultant or freelancer?

A common range is 20% to 30% of net income, depending on your state, income, and deductions. A calculation from your actual income is more accurate than a flat percentage.

Rules and limits are published by the IRS in its estimated taxes guidance and Form 1040-ES. Tax situations vary, so confirm specifics with your tax professional.

Never guess your quarterly number again

Sumly tracks every client payment and expense as it happens, calculates your estimate before each deadline and reminds you when it is due, with access to a real tax pro for anything unusual.