Methodology and Sources

This page explains how CedarBill calculators, templates, and educational content are produced and reviewed.

Reviewed by: CedarBill Editorial Team
Review date: July 14, 2026

Salary calculations

The salary calculator uses the amount, hours per week, and weeks per year entered by the user.

• Annual pay = hourly rate × hours per week × weeks per year.
• Hourly rate = annual salary ÷ hours per week ÷ weeks per year.
• Monthly pay = annual pay ÷ 12.
• Biweekly pay = annual pay ÷ 26.
• Weekly pay = annual pay ÷ weeks per year.
• Daily pay assumes five working days per week.

The default schedule is 40 hours a week for 52 weeks, or 2,080 hours a year. Results are gross figures before tax, benefits, unpaid leave, overtime, or other deductions. Occupational wage comparisons link to the U.S. Bureau of Labor Statistics Occupational Employment and Wage Statistics.

1099 self-employment tax estimate

The 1099 calculator applies the federal self-employment tax calculation to net self-employment income:

• Net earnings subject to self-employment tax = net self-employment income × 92.35%.
• Social Security tax = 12.4% of covered net earnings, limited by the 2026 Social Security wage base and reduced by W-2 wages already subject to Social Security tax.
• Medicare tax = 2.9% of covered net earnings.
• Net self-employment income below $400 returns no self-employment tax estimate.

The calculation follows the general IRS self-employment tax guidance and references the Social Security contribution and benefit base. It does not calculate federal or state income tax, credits, deductions, filing-status effects, or the additional 0.9% Medicare tax that may apply above statutory thresholds. The 25–30% set-aside range is a planning heuristic, not a tax liability calculation.

Sales tax reference data

State sales tax pages use statewide rates and population-weighted average combined state and local rates from the Tax Foundation state and local sales tax rate dataset, recorded as of January 1, 2026.

These pages are state-level references and average-rate estimators. They are not ZIP-code, street-address, city, county, product-taxability, nexus, or filing lookups. Local rates and taxable categories vary. Users should verify the applicable rate with the relevant state department of revenue or local tax authority.

Invoice templates and guidance

Profession pages are based on common billing patterns such as hourly work, project fees, milestone billing, deposits, materials, retainers, and net payment terms. The examples are editable starting points, not required contractual language. Legal, tax, licensing, and invoice requirements vary by location and business type.

Source selection

We prefer primary government sources for legal or tax requirements and clearly identified data publishers for aggregated statistics. A page should identify the source, reference date, assumptions, and important limitations near the result rather than hiding them in a general disclaimer.

Review and update process

Material calculator or factual pages display a review date and the CedarBill Editorial Team as reviewer. We review a page when its source publishes a new period, when a law or rate changes, or when a credible correction is received. A visible review date means the page was checked on that date; it does not guarantee that every external rule remains unchanged afterward.

Corrections

Send corrections to support@cedarbill.com with the affected URL, the disputed statement or value, an authoritative source, and the effective date. We update confirmed errors and revise the review date when the underlying content has materially changed.