Where do i send my 1040 federal tax return?

To send your 1040 federal tax return, the mailing address depends on your state and whether you're enclosing a payment. Generally, you can find the correct address on the IRS website or on the instructions provided with your 1040 form. If you're filing without a payment, you typically send it to the address listed for your state in the form's instructions. For payments, there is usually a different address specified.