Fidamen

1099 Tax Calculator

This calculator provides an estimate of federal self-employment tax (Social Security and Medicare), an approximate federal income tax, an estimated state tax, total estimated tax due after withholdings and prior estimated payments, and suggested quarterly payment amounts.

Estimates are intended for planning and budgeting. They do not replace official tax preparation or filing and should be used alongside IRS guidance and a qualified tax professional when necessary.

Updated Nov 29, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 1f3be4232517 • Reviewed by Fidamen Standards Committee

Fast estimate using standard self-employment tax calculation and a simplified federal income tax approximation.

Inputs

Results

Updates as you type

Estimated self-employment tax

$7,771.25

Estimated federal income tax

$7,452.87

Estimated state income tax

$0.00

Estimated total tax due (after withholdings)

$15,224.13

Suggested quarterly payment

$3,806.03

Recommended percent of gross to set aside

2768.02%

OutputValueUnit
Estimated self-employment tax$7,771.25USD
Estimated federal income tax$7,452.87USD
Estimated state income tax$0.00USD
Estimated total tax due (after withholdings)$15,224.13USD
Suggested quarterly payment$3,806.03USD
Recommended percent of gross to set aside2768.02%%
Primary result$7,771.25

Visualization

Methodology

Self-employment tax is calculated from net business earnings after allowable business expenses. The tool uses the employer-equivalent adjustment (92.35% of net earnings) to determine the Social Security and Medicare components, and applies a Social Security wage base cap to the Social Security portion.

Federal income tax is approximated using a conservative effective-rate approach in detailed mode to keep calculations transparent and fast. For precise bracket-by-bracket liability, consult IRS tax tables or tax preparation software.

Data handling and quality follow recognized engineering and security practices. This product references general standards for data integrity and security (NIST, ISO, IEEE) and adheres to general workplace safety documentation practices (OSHA) for internal operational procedures.

Key takeaways

Use the Quick estimate for a fast planning number. Use Detailed mode when you want conservative set-aside guidance and clearer component breakdowns.

This tool is for planning only. For precise filing figures, use IRS resources or consult a tax professional.

F.A.Q.

Is this the exact tax I will owe?

No. This is an estimate for planning. It uses standard formulas for self-employment tax and a simplified federal income tax approximation. Final liability can differ due to credits, itemized deductions, tax credits, AMT, Additional Medicare Tax, exact bracket calculations, and state-specific rules.

Does this account for the Social Security cap and Additional Medicare Tax?

The calculator applies a Social Security wage base cap for the Social Security portion. It does not automatically calculate Additional Medicare Tax thresholds by filing status; consult IRS guidance or a tax advisor for high-income situations.

Can I rely on the quarterly payment suggestions to avoid penalties?

Quarterly suggestions are a guideline. Avoiding underpayment penalties depends on meeting safe-harbor rules and paying sufficient amounts during the year. Use IRS resources or a tax professional for compliant payment planning.

How accurate is the federal income tax estimate?

The federal income tax estimate is intentionally conservative and simplified to keep the tool fast and transparent. For exact bracket-level calculations, use IRS tax tables or full tax-preparation software.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: 1f3be4232517

What changed (latest)

v1.0.0 • 2025-11-29 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 29, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-29 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 8b7449389680