What happens if I file early December and then the Trump tax plan makes changes that change deductions etc. Will my return be adjusted or do I lose out? Tks. Ron.

[macuser_22 · Accepted solution]

You cannot file in December.   The IRS will not open the 2017 filing season until late January but has not even given a date yet pending tax law changes.     There is no new law yet, but most changed are for the 2018 tax year and beyond, very few changes that would affect 2017 taxes.

[SweetieJean]

Do you mean early January?   It is already mid-December.  The answer above still stands.

[dmertz]

If a law is passed that makes changes that are retroactive to your 2017 tax return (such as the percentage of AGI used for determining the amount of medical-expenses that are deductible) and you filed your tax return without taking that change into account, the IRS might detect the error and refund a larger amount.  If they don't, you can always file an amended tax return to make the correction up to 3 years after the due date of your tax return