High-Dose Iodine for Hypothyroid Symptoms. This is the most common reason why people take iodine supplements, but the evidence is not simple and in fact may show some danger from the high-dose pills. In healthy people, iodine deficiency is clearly related to hypothyroid disorders, and adequate iodine intake is preventative. But too much of a good thing is not necessarily better. This study, for example, found that iodine overnutrition also contributed to autoimmune thyroid disorders and hypothyroidism.
Instead, you can use your Social Security Number and report your income and expenses on a Schedule C tax form (http://www.irs.gov/pub/irs-pdf/f1040sc.pdf). However, many sole proprietors still elect to use an EIN because it reduces the chances of identity theft and banks often require one to open a business account.
If you need a more precise accounting of Social Security taxes paid, check your W-2 statements, which break down the contributions to Social Security as well as Medicare. You can request past statements from your current and former employers, or request a complete copy of your past tax returns, including any W-2 forms filed with those forms, by completing Form 4506 and sending it to the Internal Revenue Service.