Your state, your last day, your rate — and the verdict prints your owed-by date, the penalty in dollars, your vacation verdict, and one total-owed number. Free, and nothing leaves your browser.
Most states set a deadline for your final paycheck. In about a third of them, missing that deadline has a price that grows by the day — a waiting-time penalty. It is not a fine paid to the state. In the strong states it is money owed to you, on top of the wages, and it exists because legislatures understood that a worker who just lost a job cannot wait six weeks for money already earned.
Penalty math is statutory maximum math. Where a penalty requires a willful failure, an employer with a genuine, good-faith dispute about the amount owed has a defense to the penalty (never to the wages). Our checker prints the maximum the statute allows and names the willfulness condition in the same breath — because a number you cannot defend in your own letter is worse than no number.
"You're late" is ignorable. "Under §203 the check now carries $2,340 in waiting-time penalties, accruing $78 a day" is a line item a payroll department has to book. The penalty is rarely collected in full — it is leverage, and it is the part of this system no free deadline calculator computes. Ours does: run your numbers.