We have complex tax returns every year, and every year, since moving to San Diego, we have trusted this tax preparation service with our complicated returns. Very personable/professional staff and phenomenal knowledge of tax law.
Mistakes can be fixed.
If you make an error on your tax return, you can fix the mistake by filing an amended tax return.
It is best to take care of this sort of thing quickly, because the IRS charges interest and penalties if you wind up owing them additional tax.