Am unemployed.how many years back tax can you claim?

In the United States, you can generally claim a tax refund for up to three years from the original due date of the tax return. If you haven't filed a return for those years, you should do so to claim any potential refunds. However, if you owe taxes for those years, the IRS can keep your refund to cover that debt. It's advisable to check with a tax professional for specific guidance based on your situation.