Free IRS Tax Tools
Straight answers to the questions people actually ask us, worked out on your device from the IRS's own published rules. No account needed.
Earned Income Credit
Find out whether you qualify, and roughly how much, in about five minutes.
Why did my paycheck change?
Compare two pay stubs and see exactly which line moved — and what that usually means.
What do I owe this quarter?
What to send the IRS, and by when, including the safe harbour rule that can cap it.
What should I bring to my appointment?
A list built from your own year, ready to print and take with you.
Everything here is worked out on your device. Your answers are not sent to us, and nothing is saved unless you ask us to save it.
This is an estimate, not tax advice, and it is not a tax return. Your actual credit depends on your full situation.
Lopez Tax Service is not the IRS and is not endorsed by the IRS. This tool uses tax rules the IRS publishes as open source.