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Calcimator

Small Business Tax Calculator

Estimate quarterly self-employment and federal income tax.

Inputs

$
$
$
$

Results

Total Estimated Tax

$22,287.77

≈ 11 gaming PCs

Federal Income Tax$9,571.17
Self-Employment Tax$12,716.60
Effective Tax Rate24.8%
Quarterly Estimate$5,571.94
Net Business Income$90,000.00
Remaining Tax Due$22,287.77

Figures current as of 2026. Sources: IRS Rev. Proc. 2025-32, SSA 2026 COLA Fact Sheet (Oct 24, 2025)

How to Use This Calculator
  1. Enter your gross business income and total deductible business expenses.
  2. Enter your self-employment income (net earnings subject to self-employment tax).
  3. Select your filing status (1 = Single/Head of Household, 2 = Married Filing Jointly) and enter any quarterly payments already made year-to-date.
  4. Review the Total Estimated Tax, Federal Income Tax, and Self-Employment Tax outputs.
  5. Use the Effective Tax Rate, Quarterly Estimate, and Remaining Tax Due outputs to plan upcoming estimated payments.

How the result changes with Gross Income

Gross IncomeTotal Estimated Tax
$10,000,000.00$3,649,264.28
$35,000,000.00$12,899,264.28
$65,000,000.00$23,999,264.28
$90,000,000.00$33,249,264.28

What each input means

Gross Income
Total annual gross business income.
Business Expenses
Total deductible business expenses.
Self-Employment Income
Net earnings subject to self-employment tax.
Filing Status (1=Single, 2=Married)
1 = Single/HoH, 2 = Married Filing Jointly.
Quarterly Payments YTD
Total estimated tax payments made year-to-date.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Gross Income = 120000, Business Expenses = 30000, Self-Employment Income = 90000, Filing Status (1=Single, 2=Married) = 1 = 5 input(s) provided
  2. Calculate Total Estimated Tax
    Total Estimated Tax
    22287.77 = $22,287.77
  3. Calculate Federal Income Tax
    Federal Income Tax
    9571.17 = $9,571.17
  4. Calculate Self-Employment Tax
    12716.6 = $12,716.6

Figures and sources

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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