Knowledge Base
Practical, source-backed guides for independent contractors, small business owners, and retail sellers. Step-by-step formulas, deduction checklists, and compliance rules.
Independent contractors and freelancers must pay both halves of FICA taxes totaling 15.3%. Deductible Schedule C business expenses, the 92.35% net earnings multiplier, and quarterly estimated tax deadlines determine your final tax bill.
Confusing margin with markup is one of the fastest ways a small business loses money. Master the mathematical differences, learn how to price products from Cost of Goods Sold, and avoid cash flow traps.
Over thirty US states now tax Software as a Service (SaaS) or digital downloads, but definitions and exemptions vary widely. Understand digital tax sourcing, economic nexus rules, and state-by-state compliance.
Whether delivery fees are taxable in the United States depends on state statutes, separately stated line items, and product taxability. Master the three core tests and mixed-order allocation math.
The way a price reduction is funded determines whether sales tax is calculated before or after the discount. Understand the difference between store discounts, manufacturer coupons, and rebates.
Purchasing inventory tax-free is essential for wholesale and retail margins. Learn the legal difference between permits and certificates, understand multi-state MTC rules, and avoid audit liabilities.
Our statutory research desk is preparing and peer-reviewing the following cornerstone guides:
Sales Tax on Shipping & Handling: 2026 State-by-State Rules
Separately stated exemptions, handling traps, common carrier rules, and proportional freight allocation on mixed orders.
Discounts, Coupons & Manufacturer Rebates Sales Tax Guide
Why store discounts reduce taxable sales price, why manufacturer coupons do not, and how cash discounts work under state tax laws.
Resale Certificates & Exemption Compliance Guide (2026)
How small businesses purchase wholesale inventory tax-free, state resale certificate requirements, and audit verification procedures.
Sole Proprietorship vs. Single-Member LLC: Complete Small Business Tax Guide
Pass-through taxation mechanics, Schedule C deductions, liability distinctions, and S-Corp election thresholds.
Yes. All guides reflect current IRS inflation adjustments, Social Security wage caps, standard deductions, and state tax rules for the 2026 calendar tax year.
GlobCalc guides are compiled and maintained by our Tax Research Desk using primary government records: the Internal Revenue Code (Title 26), official IRS publications, and state Department of Revenue bulletins, under the technical direction of founder Paarath Sharma.
GlobCalc guides are designed for educational planning, accurate math estimation, and workflow preparation. For complex corporate audits, legal disputes, or personalized estate planning, consult a licensed Certified Public Accountant (CPA) or tax attorney.