A deadline that limits how long the government has to collect a tax debt.

"Deadline" is the key part. After a tax is properly assessed, the taxing authority does not get forever to chase payment. "Government" can mean the IRS or a state revenue agency. "Collect" means real enforcement steps, not just sending letters: tax liens, levies, wage garnishment, bank account seizures, and lawsuits. And "tax debt" means an assessed balance, not just a return that has not been processed yet.

For federal taxes, the main rule is in Internal Revenue Code § 6502: the IRS generally has 10 years from the assessment date to collect. Tax pros often call the end date the Collection Statute Expiration Date or CSED. That clock can be paused, though. Common tolling events include bankruptcy, certain installment agreement requests, an offer in compromise, collection due process hearings, and time spent outside the country. So the smart move is to get the actual assessment date and account transcript before assuming the clock has run.

Why this matters in real life: if the deadline is close, pushing into a bad payment deal can accidentally give the collector more time. If the deadline has passed, forced collection may no longer be legal. In a personal injury case, unpaid tax debt can still cause trouble if a refund is intercepted or a bank levy hits settlement money after deposit. Timing matters, and paperwork matters even more.