Let’s look at an example of how estimated tax is calculated.
Say you’re a freelance web developer and calculate your estimated quarterly tax payments based on how much income tax and self-employment tax you owe. You expect to make $80,000 this year from your freelance projects. You anticipate incurring $10,000 in
business deductions.
- $80,000 (estimated income) - $10,000 (above-the-line deductions) = $70,000. This is your AGI.
Next, you subtract the standard deduction for single taxpayers, which is $14,600.
You can also deduct 50% of your
self-employment tax of $11,304 (calculated below), which gives you a deduction of $5,652. So, your total estimated taxable income is:
- $70,000 - $14,600 - $5,652 = $49,748.
Next, you multiply your adjusted gross income by your income tax rate based on the 2024 tax bracket. Let’s say your effective tax rate is 15%. Your estimated income taxes owed for the year work out to:
- $49,748 x 15% = $7,462.20.
Since you earned more than $400 this year, you will also have to pay self-employment tax. To calculate this, you first multiply estimated total income ($80,000) by 92.35% to find your self-employment taxable income.
- $80,000 x 92.35% = $73,880.
Then, you multiply that by the self-employment tax rate of 15.3%:
- $73,880 x 15.3% = $11,304.
For the final step, you add your estimated income tax and self-employment tax for the year and divide the total by four to find your estimated tax payment for 2024.
- $7,462.20 (estimated income tax owed) + $11,304 (estimated self-employment tax) = $18,766.20
- $18,766.20 / 4 = $4,691.55 (Your estimated tax payment for 2024).
This process can be extremely tedious. If you use an
estimated tax calculator (like the one FlyFin has), all you have to do is enter a few details about your income and deductions, and all the work is done for you.
If you’re using the
Annualized Income Installment Method, the process is more complicated. The AIIM calculates your income by “annualizing” it, which means estimating your yearly income based on your earnings over a specific time period. To use this method, you break the year into four periods.
For each period, you’ll determine your adjusted gross income and then multiply that by a set “annualization amount,” which reflects how much of the tax year is left. For instance, in the first period, the annualization amount is “4” since it represents a fourth of the year. Again, using an estimated tax calculator can make it easier to pay estimated taxes accurately and on time.