Last updated October 12, 2026.
Who these terms are with
These terms are between you and Electric Flock Ltd, a company registered in England and Wales (no. 16375990), registered office 27 Old Gloucester Street, London WC1N 3AX, United Kingdom. By using the site you agree to them. If you do not agree, please do not use it.
What the site is
QuarterTaxCalc is a free calculator that gives estimates of US federal estimated tax for tax year 2026. It is a planning tool. It is not tax, legal, accounting or financial advice, it does not prepare or file tax returns, and it does not create a professional relationship between you and us. Read the Disclaimer.
No affiliation
We are not affiliated with, endorsed by or sponsored by the Internal Revenue Service, the US Treasury or any government agency. The names of agencies, forms and any other products or services mentioned are trademarks or names of their owners and are used only to identify them.
Your responsibility
You are responsible for your own tax return, payments and deadlines, and for checking any figure with the IRS or a qualified tax professional before you rely on it. Results depend on what you enter and on the assumptions listed on the How it works page.
Acceptable use
Do not misuse the site: do not try to break or overload it, probe it for vulnerabilities without permission, scrape it at a rate that harms it, or use it for anything unlawful.
Our content
The site, its text, design and code are owned by Electric Flock Ltd or its licensors. You may use the calculator for your own personal or business planning and you may link to the site. Please do not copy or republish the site as a whole without asking.
Links to other sites
We link to IRS and other sources. We do not control those sites and are not responsible for them.
No warranty
The site is provided as is and as available. We do not promise that it is accurate, complete, current or free of errors, or that it will always be available. Tax rules and figures change.
Limit of liability
To the fullest extent the law allows, Electric Flock Ltd is not liable for any loss or penalty arising from your use of, or reliance on, the site, including underpayment penalties, interest, or taxes owed. Nothing in these terms limits liability that cannot be limited by law, or any consumer rights you have that cannot be waived.
Changes and ending use
We may change the site or these terms at any time by posting an update here. We may suspend or end access if the terms are broken or the site is withdrawn.
Governing law
These terms are governed by the laws of England and Wales, and the courts of England and Wales have jurisdiction, except that mandatory consumer protection laws where you live still apply to you.
Contact
A contact email address is being set up. Until it is live, you can write to us by post at the registered office below. Registered office: 27 Old Gloucester Street, London WC1N 3AX, United Kingdom.