Where SellerMaths gets its source logic
SellerMaths Sources
This page explains the source families used across SellerMaths, what they support, how to read a source note, and why one official document can support more than one calculator, guide, template, or trust page.
Last updated: 2026-03-25
Source page last reviewed: 2026-03-25
What this page helps you verify
Use this page when you want to check where a rule, fee assumption, disclosure, or pricing concept comes from before relying on it.
- Verify what kind of source supports a page.
- Check whether the source is platform, government, or trust-policy based.
- Understand how source notes connect to calculators, guides, templates, and trust pages.
- See why a single official document can support more than one page.
The main source families
SellerMaths does not treat all sources as interchangeable. Different pages need different kinds of support.
- Marketplace and payment sources support fee rules, payout logic, and platform-specific pricing behavior.
- Government business and tax sources support recordkeeping, gross-receipts logic, break-even thinking, and business-cost treatment.
- Privacy, advertising, and disclosure sources support trust pages, consent, analytics, disclosure language, and site-policy scope.
Marketplace and payment sources
These sources matter most when a page estimates transaction fees, payment processing costs, shipping-related fee scope, payout impact, or platform-specific seller charges.
- Typical page connections: calculators, compare pages, fee guides, and payout explainers.
Government business and tax sources
These sources matter when a page explains recordkeeping, cost coverage, gross receipts, mixed expenses, break-even logic, or spreadsheet structure for seller decisions.
- Typical page connections: pricing guides, profit explainers, templates, and methodology-support sections.
Privacy, advertising, and disclosure sources
These sources matter on trust pages that explain privacy choices, disclosures, analytics, ads, consent tooling, and the limits of what the site claims.
- Typical page connections: privacy policy, disclaimer, terms, about, and methodology trust references.
How to read a source note
A useful source note should help you answer three practical questions.
- What kind of source supports this page?
- What part of the page does it support?
- What scope or limitation still matters after reading it?
- A source note is not there to impress. It is there to help you decide whether a page fits your country, seller type, fee path, or workflow before you rely on it.
Why one source can support multiple pages
The same official document can support more than one page because different parts of the rule apply to different seller decisions.
- One fee page can support a calculator, a compare page, and a guide.
- One business guidance document can support a template and a pricing explainer.
- Reuse is normal when the scope stays honest and page-level limits stay clear.
What this page does not claim
This page improves transparency, but it does not guarantee that every official page stays unchanged, that every rule applies the same way in every country, or that a source link removes the need for page-level judgment.
Where to go next
- Go to Methodology to see how source logic becomes seller-facing calculations
- Go to Calculators to test one fee or payout scenario
- Go to Guides to understand the pricing rule behind the source
- Go to About if you want the full project scope and audience
- Go to Disclaimer or Privacy Policy for trust-page scope
- Go to Privacy Policy for privacy, consent, and disclosure scope
FAQ
Why can one official document support multiple SellerMaths pages?
Because different parts of the same rule can affect different seller decisions, page types, or calculation paths.
Does a source note guarantee that a page is fully accurate for my case?
No. A source note improves transparency, but your country, account type, tax setup, fee path, or platform settings can still change how a rule applies.
What should I do if an official source changes?
Use the page verification date, check the linked source directly, and treat SellerMaths as a decision-support layer rather than a substitute for platform review.
Are all SellerMaths pages based only on official platform sources?
No. Some pages rely on platform documentation, some on government business or tax guidance, and some on privacy, advertising, or disclosure sources depending on the page type.
Does last reviewed mean every linked source is still unchanged today?
No. It means the page was reviewed on that date. Individual source pages may still change later.
Sources
Use this registry to see which source family a reference belongs to and what kind of page logic it supports across SellerMaths.
| Source / topic | Source family | What it supports |
|---|---|---|
| Etsy Fees & Payments Policy Etsy · Last verified 2026-03-20 | Marketplace and payment | Fee rules, listing assumptions, and payment-related logic |
| eBay UK fees for business sellers eBay UK · Last verified 2026-03-20 | Marketplace and payment | Business seller fee structure and UK compare logic |
| Stripe pricing Stripe · Last verified 2026-03-14 | Marketplace and payment | Payment processing logic and standard pricing references |
| PayPal US merchant fees PayPal · Last verified 2026-03-20 | Marketplace and payment | Merchant fee scenarios and variable fee paths |
| Shopify pricing plans and billing overview Shopify Help Center · Last verified 2026-03-20 | Marketplace and payment | Subscription and plan-based cost assumptions |
| IRS recordkeeping guide for small businesses Internal Revenue Service · Last verified 2026-03-15 | Government business and tax | Recordkeeping, cost tracking, and spreadsheet structure |
| IRS Form 1099-K gross amount guidance Internal Revenue Service · Last verified 2026-03-15 | Government business and tax | Gross receipts logic and payout-reporting context |
| SBA break-even point guide U.S. Small Business Administration · Last verified 2026-03-15 | Government business and tax | Break-even logic and price-floor reasoning |
| FTC business privacy and security guidance Federal Trade Commission · Last verified 2026-03-15 | Privacy, advertising, and disclosure | Privacy expectations and trust-page framing |
| Google Publisher Policies privacy disclosures Google AdSense Help · Last verified 2026-03-15 | Privacy, advertising, and disclosure | Publisher privacy and disclosure wording |