The landscape · Self employed and owners
The deduction for half of self employment tax
A self employed person pays both halves of Social Security and Medicare tax, and the law lets half of that tax be deducted from income to mirror the employer half that a company would have deducted.
Who this exists for. This exists for anyone who pays self employment tax on freelance, gig, or business income reported on Schedule C or from a partnership. Ticks that show it: I earn money on my own (freelance, gig, side work); I own a business with revenue.
How it works
Self employment tax is 15.3 percent on 92.35 percent of net earnings, made of 12.4 percent for Social Security up to the wage base of this year's official social security wage base (not yet verified here; see the official source below) and 2.9 percent for Medicare with no cap, plus an extra 0.9 percent Medicare tax above an income line for high earners. An employee pays only half of the 15.3 and the employer pays the other half and deducts it as a business expense. To level this, a self employed person deducts one half of the self employment tax as an adjustment to income on the personal return. The deduction reduces income tax but not the self employment tax itself. It is computed on Schedule SE, and the same figure feeds the base for SEP and solo 401(k) contributions and for the qualified business income deduction.
What it gives
It is automatic on Schedule SE and needs no receipts.
It lowers adjusted gross income, which helps with phase outs elsewhere on the return.
It is taken whether or not the person itemizes.
What it costs, or where the catch is
The other half of self employment tax is still paid in full, which many new freelancers do not expect.
The deduction does not reduce the self employment tax, only the income tax.
A person with wages near the Social Security wage base has to coordinate the two sources on Schedule SE.
A worked example
Kofi earns $50,000 of net profit from driving and delivery work. His self employment tax is $50,000 times 0.9235 times 0.153, about $7,065. Half of that, about $3,532, is deducted from his income. At a 12 percent rate the deduction saves $3,532 times 0.12, about $424 of income tax, while the full $7,065 of self employment tax is still owed.
Where it goes wrong
The common miss is a first year freelancer who budgets for income tax alone and is surprised by the 15.3 percent on top, with the half deduction softening only a small part of it.
Who confirms it for you
Nobody has to; it is arithmetic you can check yourself with the numbers above.
The official source
IRS: Self employment tax, Social Security and Medicare taxes. Every figure that changes by year comes from the site's rules table, which the watcher checks against the official page on a schedule; where a figure is not yet verified, this page says so instead of printing a number.
Ask about The deduction for half of self employment tax
A model reads this page and answers from it. It will say when the answer is not on the page. Education, not personalized advice.
Nearby doors
- The health savings account
This applies when a person is covered by a qualifying high deductible health plan and has no other disqualifying coverage, which opens the door to a health savings account.
- The traditional IRA and the deduction phase out
This exists for anyone with earned income who opens an IRA on their own, and especially for a worker who also has a plan at work, since that changes whether the contribution is deductible.
- The Roth IRA and its income phase out
This exists for anyone with earned income below the Roth income lines who wants an account where qualified withdrawals come out tax free.
- The backdoor Roth and the pro rata rule
This exists for a person whose income is above the Roth IRA phase out and who has no pretax money in any traditional IRA.
- The spousal IRA
This exists for a married couple filing jointly where one spouse has little or no earned income and the other spouse earns enough to cover both contributions.
- IRA catch up at 50
This applies when a person who contributes to a traditional or Roth IRA turns 50 during the year, which adds a catch up amount to the yearly cap.
Education, not advice. Wealthy Habitat explains how rules work and never recommends what to do with your money. The No Advice Disclosure.