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Guides and how-tos on profit, margin, ad attribution, DATEV and OSS.
- Featured · PROFIT · 6 October 2026 · 6 min
Calculating Shopify profit: revenue, costs and an example
An order can bring revenue and still contribute little. Calculate net values, cost of goods, shipping, fees, advertising and returns separately, with a complete example.
Iron Saleh - COMPARISON · 2 July 2026 · 10 min
Triple Whale alternative 2026: the honest DACH comparison (with DATEV & OSS)
A DACH comparison should consider DATEV account and format review, OSS reports and the tax advisor workflow alongside analytics. Here is a decision aid, including the cases where Triple Whale can fit.
Iron Saleh - COMPARISON · 28 May 2026 · 8 min
Triple Whale too expensive? Comparing options for German shops (2026)
With Triple Whale, Polar, TrueProfit and DACH offerings, compare not just the list price but also data sources, DATEV, OSS and the tax advisor workflow.
Iron Saleh - GUIDE · 21 May 2026 · 7 min
Do I need a separate app for everything? All-in-one vs. tool stack in e-commerce
Analytics, accounting, invoices and receipts can be spread across several systems. Here is how to compare costs, data handovers and specialised functions in a traceable way.
Iron Saleh - GUIDE · 14 May 2026 · 7 min
Which profit tool for my shop? An honest decision guide (DACH 2026)
There is no single best profit tool. It depends on channels, shop size and whether you need accounting/DATEV in the same tool. This guide helps you decide honestly.
Iron Saleh
- GUIDE · 7 May 2026 · 6 min
Calculating contribution margin in e-commerce: formula + example (Shopify & co.)
The contribution margin shows what is left after all variable costs of an order. Here is the formula, a worked example and the most common mistake.
Iron Saleh - HOW-TO · 30 April 2026 · 7 min
Preparing a DATEV export from Shopify: reviewing account assignment and tax keys (2026)
What DATEV needs to import shop revenue, how to settle account assignment, OSS, fees and credit notes with your accountant, and what NorthProfit can do today: review account assignment, but not yet create a DATEV file.
Iron Saleh - GUIDE · 23 April 2026 · 6 min
MER vs ROAS: what is the difference, and which metric really counts?
ROAS measures per channel (and is often counted twice). MER measures the overall efficiency of all ad spend. For real profitability, MER is the more honest number.
Iron Saleh - GUIDE · 12 March 2026 · 9 min
The true margin: which costs can be missing from your D2C calculation.
If “revenue minus cost of goods” is your margin calculation, you are driving blindfolded. Here is what really counts, and how to calculate it cleanly.
Iron Saleh - DEEP-DIVE · 8 March 2026 · 14 min
Checking Amazon FBA fees 2026: the reliable SKU workflow.
Fees depend on store, category, dimensions and programme status. Here is how to work with Amazon's current fee overview, the fee preview and your real transactions.
Iron Saleh - PLAYBOOK · 28 February 2026 · 18 min
OSS for Shopify: a guide for German D2C brands with deadlines and the BZSt portal (2026)
The One-Stop Shop can bundle EU VAT obligations for certain cross-border B2C sales. Here are data requirements, deadlines and control steps.
Iron Saleh - GUIDE · 12 February 2026 · 8 min
TikTok Shop DACH: calculating COGS correctly despite dynamic fees.
Use the actual settlement items of your account instead of flat commission rates. TikTok Shop is available at NorthProfit for shops in Germany; where a value is missing it shows “unknown”, never 0.
Iron Saleh - TAX · 12 June 2026 · 8 min
Taxdoo alternative after 30.04.2026: separating OSS, DATEV and profit cleanly
Taxdoo discontinued its VAT services and the DATEV add-on on 30.04.2026. Here is how to redistribute filing, data preparation and profit analysis, and how to classify what NorthProfit takes over and what it does not.
Iron Saleh - TAX · 12 June 2026 · 8 min
Preparing an OSS report from Shopify: deadlines, BZSt portal and process (2026)
The OSS procedure bundles certain cross-border B2C sales into one quarterly return with the BZSt. Here is how to prepare the data from Shopify, keep deadlines and payment, and separate reporting, review and filing.
Iron Saleh - TAX · 12 June 2026 · 7 min
E-invoicing obligation 2025–2028 for online merchants: deadlines, exceptions and formats
Since 01.01.2025 domestic businesses must be able to receive e-invoices. From 2027 issuing becomes mandatory for businesses with more than €800,000 prior-year revenue, from 2028 for everyone, with exceptions. What this means for shop owners.
Iron Saleh - COMPARISON · 20 June 2026 · 9 min
TrueProfit vs. NorthProfit: the honest comparison for German shops (2026)
Compare profit analytics, data sources and the DACH tax advisor workflow using current product documentation. NorthProfit details refer to the documented status in its own product.
Iron Saleh - COMPARISON · 18 June 2026 · 8 min
Polar Analytics alternative for DACH: when switching pays off (2026)
Compare analytics flexibility, setup effort and the DACH tax advisor workflow using your requirements and the vendor's current documentation.
Iron Saleh - GUIDE · 16 June 2026 · 8 min
Lexware Office/sevDesk + profit tracking: comparing two tools cleanly (2026)
Compare a separate accounting and analytics stack with an integrated solution using current plans, data handovers and your tax advisor workflow.
Iron Saleh - GUIDE · 14 June 2026 · 9 min
Calculating true shipping costs and returns into your margin (calculation guide)
Outbound shipping is only part of the logistics costs. This guide uses a clearly labelled worked example to show how return labels, handling and loss of value can be included.
Iron Saleh - GUIDE · 12 June 2026 · 9 min
Meta CAPI vs. Pixel: classifying tracking signals and profit metrics
Browser and server events have different technical limits. Here is how to classify deduplication, consent, attribution and profit metrics without confusing platform data with accounting truth.
Iron Saleh - HOW-TO · 10 June 2026 · 8 min
Reviewing Shopify data for DATEV with your accountant (2026)
How to settle accounts, tax keys, fees and corrections with your firm, test a closed period and document adjustments before shop data lands in DATEV.
Iron Saleh