I forgot to add to my SEP account do I have to amend my taxes I’m self employed but filed a standard deduction.

[Zbucklyo · Accepted solution]

If you made the SEP contribution by the 4/15 filing deadline, you will want to amend your tax return to add the contribution, as it may reduce your tax liability.  If you haven't yet made the contribution, and you did not file an extension form with the IRS, it is too late to make a SEP contribution for 2018.

[danielleburnett]

I put on my taxes I made a contribution but I forgot to.

[Zbucklyo]

In that case, you will also have to amend your tax return to remove the contribution, and pay the additional tax due, if any.  Depending on your state of residence, you will also be required to amend your state tax return.  It is now past the deadline to make a contribution.