San Franciscoâofficially known as the City and County of San Franciscoâis a consolidated city-county, a status it has held since the 1856 secession of what is now San Mateo County. It is the only such consolidation in California.
Under New York's Tax Law, there is generally a three-year statute of limitations on tax audits, though in some cases (such as when fraud exists or when a substantial understatement has been made on an income tax return), the statute of limitations can last for as long as six years.
The IRS gets six years to audit you if it can show a large understatement of income, and if it can show that your return is fraudulent, it can open the audit and assess at any time; there is no statute of limitations on a fraudulent return. The FTB, on the other hand, assesses the increased tax as soon as it smells a problem.