ACA Affordable Care Act (aka 'Obama-Care')
DC District Coordinator
Dividends Q: What is the difference between ordinary and qualified dividends?
A: Ordinary dividends are taxed at ordinary income rates, while qualified dividends receive more favorable tax treatment by being taxed at capital gains rates.
EFIN Electronic Filing Identification Number
EIC Earned Income Credit (ref Form 8889)
EIN Employer Identification Number
ERO Electronic Return Originator
Health Insurance Marketplace Federal exchange where health insurance can be purchased.
ITIN Individual Taxpayer Identification Number
Kiddie Tax If a child claimed as a dependent on a tax return has unearned income more than $2,100, see IRS Topic Number: 553 for guidance on how to report that income.
LC Local Coordinator (aka Site Leader)
Medicaid Medicaid provides medical coverage to low-income individuals and families. Individual states and the federal government share the cost of the Medicaid program. Medicaid services in Florida are administered by the Agency for Health Care Administration.
MEC Minimum Essential Coverage (Health Care)
PAB Private Activity Bonds
These bonds are typically issued by, or on behalf of, local or state government for the purpose of providing special financing benefits for qualified projects.   The income from these bonds is not subject to regular Income Tax, but may be subject to the Alternative Minimum Tax on Form 1040 Line 45 & Form 6251.
PTC Premium Tax Credit (Form 8962)
A payment made by the Federal Government to an insurance company on behalf of a taxpayer (or dependent) to reduce his/her monthly premiums for health insurance. PTC assistance was based on anticipated annual income claimed on the PTC application, so it must be reconciled with actual annual income on the tax return for that year.
QR Quality Review or Quality Reviewer
Scope Tax topic limitations
SEP, SIMPLE, and Qualified Plans Taxslayer has a nice explanation.
SRP Shared Responsibility Payment
Owed by the taxpayer for any individual(s) on his/her tax return who did not have MEC health insurance for all or part of 2017.
VITA/TCE Volunteer Income Tax Assistance (VITA) / Tax Counseling for the Elderly (TCE)