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Add-on service

Something wrong on a filed return? We'll fix it properly.

Amended 1120S and 1040 returns, prepared and filed to correct a mistake, add a missed form, or respond to a change.

When to amend.

You may need to amend if you left income off, missed a deduction or credit you were entitled to, received a corrected W-2 or 1099 after filing, or had a K-1 change after your personal return went in.

Not every error needs an amendment, and some the IRS corrects on its own. We'll look at what changed and tell you honestly whether amending is worth it.

What we do.

We prepare the amended return (Form 1120-S with the amended box, or Form 1040-X for individuals), document what changed and why, and file it.

If the amendment affects shareholder K-1s, we reissue those too, since a changed 1120S usually ripples into each owner's personal return.

How it's priced.

Quoted per amendment, since the work depends entirely on what's changing. You'll know the cost before we start.

Need to file the original return first?

Amendments require a previously-filed return. If yours never went in, see Prior-year returns instead.

Filing now · FY 2026

Pick your form.
We'll take it from there.

Two forms, two deadlines, one workflow. Tell us which return you're filing and we'll send the SmartVault link and document checklist within the hour.

S-Corp · Form 1120S Mar 15
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Individual · Form 1040 Apr 15
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