The SunnyBill Team

What we do

We build free, privacy-first tools for people who work for themselves: an invoice generator, a 1099 tax calculator, and a library of plain-English guides on invoicing, pricing, and US self-employment taxes. Everything runs in your browser, and we do not ask you to sign up or hand over your data.

How we research our guides

Our tax and money content is what search engines call YMYL ("your money or your life"), so we hold it to a higher bar. For every guide and calculator we:

• Start from primary government sources (the IRS, the Social Security Administration, and state tax agencies) rather than secondary summaries.
• Cite the specific tax year. Self-employment tax rates, standard deductions, the Social Security wage base, and mileage rates change annually, and our calculators encode the figures for the stated year.
• Review each guide when the IRS publishes new figures, and show a visible "Updated" date so you know how current the page is.
• Keep the math transparent. Where a guide states a rule of thumb (for example, setting aside 25-35% for taxes), we explain the assumptions behind it so you can adjust for your own situation.

Primary sources we rely on

• IRS Self-Employment Tax (Social Security and Medicare), Schedule SE, and Schedule C guidance.
• IRS Estimated Taxes (Form 1040-ES) and the safe-harbor rules.
• IRS Qualified Business Income (QBI) deduction guidance under Section 199A.
• The Social Security Administration's annual wage base announcements.
• IRS standard mileage rates and home-office deduction rules for the relevant year.

An important note

Our guides and calculators are educational and built to help you plan and format documents. They are not tax, legal, or accounting advice, and they do not replace a qualified professional. Tax rules vary by state and by individual circumstance, so verify anything important with a CPA or enrolled agent before you file or make a major decision.

Corrections

If you spot a figure that looks out of date or a rule we have stated imprecisely, we want to fix it. Accuracy is the whole point of these tools, and we update them when the underlying law changes.