Piggyback / federal / state:
The state tax return is attached and transmitted with the federal return, and the federal return must be accepted before the state return can be processed.
If the federal return is rejected, the state return will also be rejected.
State-only return:
The state return can be processed independently of the federal return. It's a common misconception that these returns aren't sent to the IRS—they are.
However, the IRS sets aside these returns for processing by the states, in most cases, prior to acceptance of the federal return or the federal return being e-filed.
Direct or standalone:
The state return is entirely separate from the federal return, and acknowledgements are processed separately.
The exception for a direct return state is Illinois, which utilizes IRS common processing through the KC service center.
Piggyback only Piggyback/State only Standalone/Direct
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