SEP contribution for extended tax filing amendment

[zamh]

I want to contribute more to a SEP than the amount stated on my filed return before the 10/16 deadline, (which TurboTax calculated would reduce my tax bill). When I reopened TurboTax to file the amendment, it says the SEP amount can only be entered by those filing a schedule C, although there will be no change to my Schedule C. My understanding is that only changed info is added to an amendment. Can you tell me what steps to take to make the necessary change? Thanks.

[dmertz]

A change to your previously reported SEP contribution (within the permissible limit for a SEP contribution) will change your AGI.  Unless there is some other change to your tax return due to the change in AGI  or the reduction in income available to support a regular IRA contribution causing some portion of an IRA contribution for the year to become an excess IRA contribution, forms beyond the Form 1040X will be present in your amendment.  The change in AGI will be shown on line 1 of Form 1040X and the Form 1040X will include your explanation that the AGI changed due to a change in the amount of SEP contribution reported.

If you originally told TurboTax to maximize your SEP contribution amount, that's the amount that you contributed and you have no change in your net profit from self employment, you are not permitted to contribute any more to the SEP-IRA for that tax year.