Amazon Flex vs. Walmart Spark: Which Gig Keeps More After Taxes?
Flex and Spark look alike from the driver's seat — packages, groceries, a 1099 at year end. But they pay differently, and that changes how much tax you owe per hour worked. Below is a realistic comparison you can reproduce in the Amazon Flex tax calculator and the Walmart Spark tax calculator.
How each one pays
Amazon Flex pays a fixed block rate (often $18–$25/hour in scheduled blocks) with tips on Fresh and Whole Foods orders. Spark pays per offer — base pay plus incentives plus customer tips — so hourly earnings swing more. Both treat you as an independent contractor: no withholding, and you pay the full 15.3% self-employment tax.
The mileage difference is the tax difference
Flex blocks often send you on long routes from a single station, so drivers commonly log 18,000–22,000 miles on $40,000 gross. Spark trips are shorter loops from local stores, frequently 12,000–16,000 miles on the same gross. More miles cost you more in gas and wear, but they also produce a bigger $0.70/mile deduction, which shrinks taxable profit.
Side-by-side example
Both drivers gross $40,000, single, in Texas (no state income tax), with $1,200 in phone and supply expenses.
Flex driver: 20,000 miles
Mileage deduction $14,000. Net profit about $24,800. SE tax roughly $3,500, federal income tax roughly $1,000 after the standard deduction and half-SE deduction. Total about $4,500 — roughly 11% of gross.
Spark driver: 14,000 miles
Mileage deduction $9,800. Net profit about $29,000. SE tax roughly $4,100, federal income tax roughly $1,500. Total about $5,600 — roughly 14% of gross.
But the Flex driver isn't richer
The Flex driver drove 6,000 extra miles. At a real cost of $0.35–$0.45 per mile in gas and depreciation, that's $2,100–$2,700 of actual car cost — more than the $1,100 tax saving. Lower tax does not mean higher profit. Compare real take-home, not just the tax bill.
1099s and paperwork
Amazon issues a 1099-NEC through its tax portal for $600+ in earnings. Spark issues a 1099-NEC through Branch/Spark's tax provider. If you do both, both totals go on one Schedule C, and your miles from both go into one log.
How much to set aside
For most drivers in no-income-tax states, 12–16% of gross covers Flex and Spark taxes. In states like California or New York, plan on 16–22%. Pay quarterly using Form 1040-ES to avoid underpayment penalties.
Frequently asked questions
+Does Amazon Flex or Walmart Spark withhold taxes?
Neither does. Both pay you as an independent contractor, so you owe self-employment tax and should make quarterly estimated payments.
+Which gig has lower taxes, Flex or Spark?
Flex drivers often owe less tax per dollar because they drive more miles, but those extra miles cost real money. Compare net profit, not just tax owed.
+Can I do both Amazon Flex and Spark on one tax return?
Yes. Combine both 1099-NEC totals and your total business miles on one Schedule C for delivery driving.
+Are Spark tips taxable?
Yes. Tips are included in your Spark earnings and are taxable self-employment income.
Ask about this article
Answers are grounded in “Amazon Flex vs. Walmart Spark: Which Gig Keeps More After Taxes?”. Educational info, not tax advice.
About the author
Javed Niamat · Founder & Editor, GigTax
Javed Niamat founded GigTax to make self-employment tax math understandable for rideshare drivers, delivery couriers, creators and freelancers. He builds and maintains every calculator on this site and writes the guides that explain the numbers behind them.
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