2026 OASDI Wage Base ($184,500) and Self-Employment Tax for W-2 + 1099 Sole Props

Byline: Shortell Designs · Updated September 6, 2026

2026 OASDI / Social Security wage base: $184,500

For earnings in 2026, the Social Security (OASDI) contribution and benefit base is $184,500. That figure is published by the Social Security Administration and appears on Form 1040-ES (2026) and Schedule SE worksheets.

• SSA: Contribution and Benefit Base
• IRS: Form 1040-ES (2026)

Employee and employer each pay 6.2% OASDI on wages up to that base. Self-employed people generally pay the combined 12.4% Social Security portion of SE tax on net earnings from self-employment (subject to the shared annual base), plus Medicare.

SE tax rates and the 92.35% net-earnings factor

Under the usual Schedule SE framework (confirm on the current form):

1. Start with net profit from self-employment (generally Schedule C).
2. Multiply by 92.35% to get net earnings from self-employment subject to SE tax.
3. Apply 12.4% Social Security (OASDI) SE tax on net earnings up to the remaining wage base.
4. Apply 2.9% Medicare (HI) SE tax on net earnings — Medicare has no wage-base cap for this purpose (Additional Medicare Tax can apply separately at higher income; see IRS Topic 560).

So the headline SE combination people quote is 12.4% + 2.9% on 92.35% of net — with the Social Security slice limited by the annual OASDI base.

OASDI / Social Security wage base

$184,500

SE net-earnings factor

92.35%

SE Social Security

12.4%

SE Medicare

2.9% (no wage-base cap)

Remaining base after W-2 Box 3 (why the day job matters)

Social Security tax on wages and Social Security SE tax on self-employment share one annual base of $184,500 for 2026.

On Form W-2, Box 3 shows Social Security wages. Those wages already used up part of the base. A practical planning step for mixed W-2 + 1099 filers:

Remaining OASDI base ≈ $184,500 − W-2 Box 3 Social Security wages (not below zero).

• If Box 3 is already $184,500 or more, you generally do not owe more 12.4% Social Security SE tax on side-hustle earnings (Medicare SE tax can still apply).
• If Box 3 is lower, only the remaining base is still available for the 12.4% SE Social Security tax on net earnings from self-employment.

Do not invent numbers. Read your actual W-2 Box 3 and the current Schedule SE / Form 1040-ES worksheets. Schedule SE and self-employment tax pages are the official references.

What a W-2 + 1099 spreadsheet can track

A bookkeeping kit can log W-2 Box 1 and Box 3, estimate remaining OASDI base, and rough out SE tax + income-tax reserve for quarterly planning. That is an estimate, not a filed Schedule SE or Form 1040-ES.

Official sources to re-check