1099 Tax Calculator for Poshmark Sellers — GigWorker Tools

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Default Tax Deductions for Poshmark Workers

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131| As a Poshmark independent contractor, you can deduct these common business expenses on your Schedule C. All deductions must be ordinary (common in your industry) and necessary for your work. 132|

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✓ Cost of goods sold (COGS) — inventory purchase
✓ Platform fees and commissions (20% on sales above $15)
✓ Shipping supplies
✓ Product photography
✓ Storage space (home office / closet)
✓ Label printing
✓ Payment processing fees
✓ Return processing and refund losses

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Key Tax Facts for Gig Workers

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📋 All gig platform income is reported on Schedule C (Form 1040)
💰 Self-employment tax is 15.3% — you pay both halves
🚗 Business mileage rate is $0.725/mile for 2026
📅 Quarterly estimated taxes are due Apr 15, Jun 15, Sep 15, Jan 15
📝 Keep a mileage log — IRS requires contemporaneous records
🏠 Home office deduction: up to $1,500 (simplified method)
📱 Phone and internet: deductible at your business-use percentage

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