| ACRS | accelerated cost recovery system |
| AFDC | Aid to Families with Dependent Children |
| AGI | adjusted gross income |
| AMT | alternative minimum tax |
| CBO | Congressional Budget Office |
| CDCTC | child and dependent care tax credit |
| CDE | community development entity |
| CRS | Congressional Research Service |
| CTC | child tax credit |
| CY | calendar year |
| DB | defined benefit |
| DC | defined contribution |
| DEFRA | Deficit Reduction Act of 1984 |
| DISC | domestic international sales corporation |
| EEC | European Economic Community |
| EITC | earned income tax credit |
| EGTRRA | Economic Growth and Tax Relief Reconciliation Act of 2001 |
| ERISA | Employee Retirement Income Security Act of 1974 |
| ERTA | Economic Recovery Tax Act of 1981 |
| ETI | extraterritorial income exclusion |
| ETR | effective tax rate |
| EU | European Union |
| FSC | foreign sales corporation |
| FY | fiscal year |
| GAO | General Accountability Office |
| GDP | gross domestic product |
| GNP | gross national product |
| HI | Hospital Insurance (under Medicare) |
| HSA | health savings account |
| IRA | individual retirement account |
| IRS | Internal Revenue Service |
| JCT | Joint Committee on Taxation |
| JGTRRA | Jobs and Growth Tax Relief Reconciliation Act of 2003 |
| MSA | medical savings account |
| NTJ | National Tax Journal |
| OASDI | Old Age, Survivors, and Disability Insurance (Social Security) |
| OASI | Old Age and Survivors' Insurance |
| OBRA | Omnibus Budget Reconciliation Act (various years) |
| OMB | Office of Management and Budget |
| OTA | Office of Tax Analysis (Treasury) |
| OTP | Office of Tax Policy (Treasury) |
| PAYGO | pay-as-you-go |
| PILOTS | Payments in Lieu of Taxes |
| PRWORA | Personal Responsibility and Work Opportunity Reconciliation Act of 1986 |
| REA | retirement equity act |
| SCHIP | state children’s health insurance program |
| SSI | Supplemental Security Income |
| TANF | Temporary Assistance for Needy Families |
| TEFRA | Tax Equity and Fiscal Responsibility Act of 1982 |
| TRA | Tax Reform Act (various years) |
| VAT | value-added tax |
| WTO | World Trade Organization |
| WtW | Welfare-to-Work |