For first-time Schedule C filers · 2026
Self-employment taxes, read off the IRS form — one job, one line at a time.
Trade Tax Desk reads the IRS form a specific job actually files — one tax year, one line at a time. Every number traces to an IRS document, a tax year, a line, and a check date; draft forms are labeled as drafts.
What applies right now
Due dateArticle 11
January 15, 2027
The fourth 2026 estimated-tax installment is due. The safe-harbor comparison at Worksheet 2-1, lines 12a–12c, is what decided the year's required annual payment.
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Late-year startArticle 4
First income in October?
The annualized-income method — Form 2210 and its Schedule AI — exists for exactly that: each period recomputed from the income actually received by its cutoff.
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On the 2026 returnArticle 2
Schedule SE, line by line
Your Schedule C net profit is where Schedule SE starts. The self-employment tax is figured there line by line — and half of it is deducted on Schedule 1, line 15.
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Start with your job
6 job hubs · 21-article catalogueHub 01Schedule C
Real Estate Agent
Start: quarterly estimated taxes on Form 1040-ES, line 15.
6 articles
Hub 02Schedule C
Owner-Operator Truck Driver
For owner-operators — not company W-2 drivers.
In preparation
Hub 03Schedule C
Solo Creator
Start: where creator income lands on Schedule C, line 1.
2 articles
Hub 04Schedule C
Freelance Designer / Consultant
Start: Schedule C line by line, down to line 31.
4 articles
Hub 05Schedule C
Marketplace Seller
Start: your Form 1099-K is gross — walk it to Schedule C, line 1.
3 articles
Hub 06Schedule C
Booth/Suite Hairstylist & Barber
Start: the booth renter's Schedule C walk — tips in line 1, booth rent on line 20b.
4 articles
Find it by form line
You have the form open. Look up the line.Form 1040-ES (2026)Line 15
Amount of each estimated tax payment
Pub. 505, Worksheet 2-1Line 12c
Required annual payment (safe harbor)
Schedule SE (2026)Line 12
Self-employment tax
Schedule SE (2026)Line 3
Net earnings — the notary dotted-line subtraction
Schedule 2 (2026 draft)Line 4
Self-employment tax — box 3, code "EN", when no Schedule SE is filed
Schedule C (2026)Line 1
Gross receipts or sales
Schedule C (2026)Line 7
Gross income
Schedule C (2026)Line 9 · Part IV 43–47b
Car and truck expenses
Schedule C (2026)Part IV · Lines 47a–47b
Information on Your Vehicle — the evidence questions: written evidence, another vehicle, off-duty availability
Schedule C (2026)Line 30
Expenses for business use of your home
Schedule C (2026)Line 31
Net profit or (loss)
Schedule C (2025 final)Part III · Lines 35–42
Cost of goods sold — figured in Part III, entered on line 4
Schedule C (2026)Line 20b
Rent on other business property (booth rent)
Schedule AI (Form 2210)Line 27
Annualized income installment
Schedule 1 (2026 draft)Line 16
Retirement plan contributions
Schedule 1Line 8j
Nonbusiness (hobby) income — routed off Schedule C
Form 2553Line E
Effective date of S-corp election
Form 1099-KBox 1a
Gross amount of payment card / third party network transactions
Form 1099-NEC (2026)Box 1a
Nonemployee compensation — amounts paid to the payee; box 1b designates the cash tips included in box 1a
Publication 463 (2025)Ch. 5 · Table 5-1
How to prove certain business expenses — amount, time, place or description, business purpose
The $1,000 Line
Reads a single line of the 2026 Estimated Tax Worksheet — line 14b, the $1,000 test — and prints the four 2026 payment dates and the January 31 filing exception, with its sources on the page.
Sources: Publication 505 (2026) · Form 1040-ES (2026)
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