I am building Profenor because Shopify sellers deserve to actually see their numbers, not guess at them. I am working with a small group of real sellers while we build, so your feedback shapes what we ship. The free week costs nothing and needs no card. You can reach me directly any time at info@profenor.com. — Dexter Rozario, founder, Profenor
The $0.30 flat fee is quietly killing your small-order margin — here's the math
"2.9% + $0.30" hides a fixed cost that hits small orders hardest. See the real effective rate by order value — a $10 order pays nearly double the headline rate.
Read the guide → Fees & profitHow to calculate net profit per Shopify order — a worked example
Revenue minus fees minus cost isn't the whole story. Walk through a single order end to end and see what you actually keep.
Read the guide → The wedge · IRS codeIs your Shopify app subscription tax-deductible? (And the IRS code that covers it)
Almost always, yes — and there's a specific line of the tax code (§162) that says so. Where it lands on your Schedule C, and the edge cases to watch.
Read the guide → Schedule C · IRS codeThe Shopify seller's guide to Schedule C (Form 1040)
Every line that matters to a DTC store — gross receipts, COGS via Part III, the key expense lines, plus self-employment tax and quarterly estimates.
Read the guide → Is X deductible? · IRS codeAre Shopify fees tax deductible? (Payment processing, subscriptions, and apps)
Subscription, processing fees, transaction fees, apps, themes and domains under §162 — where each lands, plus the gross-vs-net trap that overstates your profit.
Read the guide → Estimated taxes · 1040-ESQuarterly estimated taxes for Shopify sellers (1040-ES)
No one withholds tax on your store's profit — the IRS generally expects you to pay as you go. The pay-as-you-go rule, the safe harbors, and the four deadlines, in plain English.
Read the guide → NexusEconomic nexus for Shopify sellers, explained — the mechanism, not the scary numbers
Why a store can owe sales tax in a state it's never visited. The rule after Wayfair, in plain English, without a wall of thresholds.
Read the guide → Nexus · ChecklistEconomic nexus for Shopify sellers: a plain-English checklist
What triggers an evaluation, what to track per state, the common myths (marketplace-only, "I'm under the line"), and when to call a sales-tax pro.
Read the guide → Nexus · Multi-channelMulti-channel nexus: why selling on Shopify + Amazon + Etsy changes the picture
Marketplaces collect for their own sales, but your combined footprint (and sometimes your fulfillment network's own inventory) is what actually drives your nexus picture.
Read the guide →Guides are educational and are not tax, accounting, or legal advice. Verify any tax treatment with a qualified professional. Profenor is bookkeeping software, not a CPA firm. © Profenor (RJ-DCF LLC).