It's a really good idea to "auto populate" your tax information and/or your parent's tax information using the tool IRS Data Retrieval Tool in the FAFSA. This makes the process easier and guards against typing mistakes. Another benefit is that you are less likely to have your FAFSA audited--which can really slow down the process of getting aid. 
Because the FAFSA becomes available in October for the NEXT school year, the tax information it requires is from the PREVIOUS completed tax year. See the chart below for details. Since more than one FAFSA is available at a time, be sure to select the correct school year when you complete the FAFSA.

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