On $13,000 of 1099 profit in 2026, you owe about $1,837 — all of it self-employment tax. This 1099 tax calculator walkthrough shows the two-step math, with a calculator below to run your own number. You owe even under the standard deduction: that deduction only removes income tax, and self-employment tax starts at $400 of profit.

How do I calculate self-employment tax on 1099 income?

Multiply your net profit by 92.35%, then by 15.3% — that's the whole formula, straight off Schedule SE. Two steps, and the order matters:

• Step 1 — net profit × 92.35%. Start with profit (1099 income minus business expenses), not the gross on your 1099. The 92.35% comes from §1402(a)(12): it's 100% minus 7.65%, Congress handing the self-employed the same break an employee gets, because the employer's half of payroll tax is never taxed as wages.
• Step 2 — × 15.3%. That's 12.4% for Social Security plus 2.9% for Medicare. The 12.4% piece stops at the 2026 wage base of $184,500 (per the Social Security Administration); the 2.9% Medicare piece never stops. Most first-year contractors never come near the cap.

The 15.3% comes straight from the statute: IRC §1401 imposes 12.4% for old-age, survivors and disability insurance plus 2.9% for hospital insurance on self-employment income. Net effect: SE tax runs about 14.1% of your net profit (15.3% × 92.35% = 14.1%). One more break comes later — §164(f) lets you deduct half of the SE tax when you compute income tax, which softens the second calculation below. For a line-by-line walkthrough written for 1099 workers, see our guide to how self-employment tax is calculated.

How do I calculate income tax on top of self-employment tax?

Net profit minus half your SE tax, minus the standard deduction, taxed at the 2026 brackets — that's the stack, in that order:

• Adjusted gross income: net profit − ½ of SE tax (the deductible half allowed by §164(f)).
• Taxable income: AGI − the 2026 standard deduction ($16,100 single / $32,200 MFJ).
• Apply the brackets: they're marginal. A single filer's 2026 brackets start at 10% up to $12,400 of taxable income, then 12% up to $50,400, then 22% up to $105,700 (Rev. Proc. 2025-32). You never multiply your whole income by one rate.

I tell clients to treat this as a separate stack that starts only after the SE tax is computed. One more deduction most gig earners qualify for: the 20% qualified business income deduction under §199A. Below the 2026 threshold of $201,750 (single) or $403,500 (MFJ), it's simply 20% of qualified business income, subject to the taxable-income limit — no phase-out gymnastics. It reduces income tax only, never SE tax.

What does the math look like on a real number?

On $13,000 of net 1099 profit, a single filer in 2026 owes about $1,837 — all of it self-employment tax, none of it income tax. I use this exact number because it matches the situation I see most often in a first year: someone who went 1099 mid-year and cleared five figures of profit. Here's the whole bill, using 2026 figures:

• SE tax: $13,000 × 92.35% = $12,005.50; then $12,005.50 × 15.3% = $1,836.84, call it $1,837.
• The deductible half: $1,837 ÷ 2 = $918 (rounded) comes off before income tax.
• Income tax: $13,000 − $918 = $12,082; then $12,082 − $16,100 standard deduction = less than zero. $0.
• Total federal bill: roughly $1,837 — all of it self-employment tax, owed on income that was "under the standard deduction."

That's the April surprise in one example: zero income tax, a four-figure bill anyway. Nothing about it is a penalty or a mistake — it's just the tax nobody withheld for you.

Do I owe tax if my 1099 income is under the standard deduction?

Yes — you owe self-employment tax, just not income tax. This is the single most common first-year misunderstanding, and it's exactly what one new contractor asked on the TurboTax community after going 1099 mid-year:

"My 1099 Contractor work will not exceed my standard deduction of 14k income by year's end, likely will come in around 13k. Question(s): How do I estimate quarterly taxes? Do I even need to pay them if my 1099 income will not exceed my standard deduction of 14k?" — NB36, TurboTax Community, August 28, 2024

The answer he got was right: even with income under the standard deduction and zero regular income tax, self-employment tax still applies. His $14,000 figure was the 2024 standard deduction — for 2026, the single filer's standard deduction is $16,100 under Rev. Proc. 2025-32 ($32,200 married filing jointly, $24,150 head of household). But the logic hasn't changed. Two different taxes, two different rules:

• Income tax is calculated on taxable income after the standard deduction. Under $16,100 (single, 2026) usually means $0 of income tax.
• Self-employment tax ignores the standard deduction entirely. Per Schedule SE, it kicks in at $400 or more of net profit and funds your Social Security and Medicare — the payroll taxes your old employer used to split with you.

So "under the standard deduction" is not a free pass. It's a pass on one of the two taxes. For the bigger picture beyond this one calculation, our self-employed and 1099 tax planning page covers it.

What happens if you skip the self-employment tax?

The IRS's Automated Underreporter program matches the 1099s filed against you to your return and bills you for the self-employment tax you skipped — plus a penalty. That's not hypothetical; it's exactly what happened in Clark v. Commissioner, T.C. Memo. 2025-13 (Docket No. 16969-22, filed February 4, 2025).

A freelance movie-review writer since 1995 who also sold movie memorabilia on eBay received $8,250 from his writing and $41,972 through PayPal in 2019 — and PayPal sent both him and the IRS a Form 1099-K. With help from a representative at an H&R Block location, he reported the $50,222 total as "other income" on line 7a of his return instead of on Schedule C, claimed the $12,200 standard deduction, and paid $4,369 of income tax. He thought he was done. In June 2021, the IRS's Automated Underreporter program sent him a CP2000 notice, followed by a notice of deficiency for the self-employment tax he never computed. The Tax Court held he owed self-employment tax on both activities and sustained the $1,025 accuracy-related penalty — a $6,670 deficiency on $50,222 of profit. Those are 2019 figures; the mechanics are identical today.

One caveat: a T.C. Memo decides one taxpayer's facts, so read it as an illustration, not a rule for everyone. The move it hands you is universal: run SE tax first on every dollar of 1099 or 1099-K profit, then income tax, then set the money aside.

When are 2026 quarterly estimated taxes due on 1099 income?

April 15, June 15, September 15, 2026, and January 15, 2027 — those are the four due dates for 2026 estimated payments, and they apply if you expect to owe $1,000 or more for the year. The IRS doesn't wait until April for self-employed income. Per Form 1040-ES, those are the 2026 dates. Went 1099 on July 1? Your first payment was the September 15 one — you only pay for the quarters you were actually in business.

To keep the underpayment penalty off the table entirely, §6654 sets a safe harbor: pay in the smaller of 90% of your 2026 tax or 100% of the tax shown on your 2025 return (110% if your 2025 AGI was over $150,000). That settles the question no matter how the year goes. For the four 2026 due dates and how to actually send the money, see our guide to paying quarterly taxes for the first time.

Does the new $2,000 1099-NEC threshold change what I owe?

No — it changes what gets reported, not what gets taxed. For payments made in 2026, businesses only have to issue a Form 1099-NEC once they've paid you $2,000 or more, up from the $600 floor that applied to 2025 payments (per the 2026 1099-NEC instructions). But every dollar of self-employment income is taxable whether or not a form shows up. If a client paid you $1,500 and sent no 1099, it still goes on your Schedule C.

How much should I set aside from each payment?

25% to 30% of every net dollar — 25% in no-income-tax states, 30% in California, and more in an unusually profitable year. My standing advice is to sweep it into a separate tax account the day you get paid. That's not an IRS rule; it's the arithmetic above turned into a habit. SE tax takes about 14.1% of profit, a typical first-year contractor's federal bracket adds 10–12%, and state tax covers the rest. Set it aside monthly and April becomes a reconciliation, not a crisis. More on the system in how much to set aside for taxes.

What else do first-year 1099 workers ask about their tax bill?

The short answers: SE tax runs on profit, the $400 trigger still requires filing, skipping quarterly payments adds a penalty, and QBI never reduces SE tax. The fuller versions:

Run your own numbers through the calculator above. The move is simple: compute SE tax first, income tax second, then divide the year's expected bill across the quarterly due dates and sweep the money aside as it comes in.

Want a second set of eyes on your 1099 numbers before your next quarterly payment? N&T Tax & Advisory Group helps first-year contractors calculate their self-employment and income tax, set the right quarterly payments, and capture every deduction they're entitled to — by phone or video, nationwide. Book a meeting with our team here.