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