# Self-employment Contribution Calculator — United States

> Estimate ordinary US self-employment contributions, UK Class 4/voluntary Class 2, or Irish annual self-assessed Class S PRSI. Income tax, USC, capital gains and special exemptions are separate. USD planning view; stated limitations apply.

Page: https://askcalculators.com/us/self-employment-tax/
Definition: https://askcalculators.com/us/self-employment-tax/definition.json
JSON Schema: https://askcalculators.com/us/self-employment-tax/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/us/self-employment-tax/?profit=60000&wages=0&additional=0&rulesConfirmed=0

## Inputs
- profit: Annual net business profit; type=money; required; default=60000; min=0; max=1000000000000
- wages: US Social Security wages already paid this year; type=money; required; default=0; min=0; max=1000000000000
- additional: Other independently verified contribution/additional Medicare; type=money; required; default=0; min=0; max=1000000000000
- rulesConfirmed: Country/year, contribution eligibility and additional charges verified; type=checkbox; optional; default=false

## Outputs
- contributionBase: Modeled contribution base; format=currency
- contribution: Modeled contributions; format=currency; primary
- halfDeduction: US half-SE-tax adjustment before separate limitations; format=currency

## Formula
US: net earnings × Social Security/Medicare rates, subject to remaining SS wage base. UK: 2026/27 Class 4 marginal bands plus eligible voluntary Class 2. Ireland: 2026 blended Class S rate and minimum.

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.