1. Abandonment
  2. Ability to pay
  3. Above-the-line deduction
  4. Abstract of title
  5. Accelerated cost recovery system
  6. Accelerated depreciation
  7. Acceleration clause
  8. Acceptance
  9. Accident and health insurance
  10. Accounting method
  11. Accounts receivable turnover
  12. Accrual accounting
  13. Acquiring financial institution
  14. Acquisition fee
  15. Actual cash value
  16. Actuary
  17. Ad valorem tax
  18. Add-on interest
  19. Add-on interest loan
  20. Add-ons
  21. Addendum
  22. Additional principal payment
  23. Ademption
  24. Adjustable-rate mortgage
  25. Adjusted balance
  1. Adjusted basis
  2. Adjusted gross income
  3. Adjustments to income
  4. Administrator
  5. Adoption credit
  6. Adoption taxpayer identification number (ATIN)
  7. Advance medical directive
  8. Adverse possession
  9. Affinity credit card
  10. Affordable Care Act
  11. Aftercare
  12. Aggressive growth
  13. Agreed boundary
  14. Agreement of sale
  15. Air miles
  16. Alienation clause
  17. Allowable cost
  18. Allowance
  19. Alpha
  20. Alternative minimum tax
  21. Alternative mortgage
  22. Ambulatory benefits
  23. Amended return
  24. American Opportunity Tax Credit
  25. Amortization