Client tax organizer (if you use one)
Copy of last year’s tax returns (new clients only)
W-2: wages 
1099-R: pensions, annuities, IRA’s, rollovers
K-1: Partnership, S-corporation, trust reporting documents
1099-INT: interest earned
1099-DIV: dividends earned
1099-B: stock sales, need purchase dates and cost
1099-G: unemployment compensation, state tax refund, stimulus rebate amount 
1099-SSA: Social Security benefits
W-2G: lottery, gambling winnings
Form 5498: annual report of IRA balances
Federal and state estimates: provide date and amounts paid
Name, address, ID, amount paid to each child care provider
1098: mortgage interest statement(s)
Closing statements for real estate bought and sold
Closing statement for purchase of property that you sold this year
Receipts for charitable contributions including non-cash
Social security cards for new dependents and new clients
Business/rental income and expense by category
Any IRS or state correspondence received during year
December 31st odometer reading for business auto
Real estate taxes paid if not escrowed by your bank
Personal property taxes paid for your auto, boat, RV, motorcycle, trailers, etc.
Tax preparation fees paid last year (new clients only)
Union dues paid
Investment expenses paid
College tuition and fees for you, spouse and dependents
Student loan interest paid
Educator expenses paid – necessary teacher’s supplies
IRA contributions made
Health insurance costs (not pre-tax dollar)
Doctors, dentists, hospital, nursing home costs paid
Prescription medicines paid
Eye-care costs paid
Summary of miscellaneous medical expenses
Medical mileage driven
Charitable mileage driven
Utilities, insurance, and repairs if you have a home office
Square footage of your home and office used for business
Description, cost and purchase date of business assets
List of capital assets traded/sold/disposed of
Meal and entertainment costs if for business purposes
Copy of Profit and Loss statement for your business
Copies of 1099-MISC issued to independent contractors
Year-end payroll reports if you had employees 
Interest expense on business autos, or on equipment
  
Plus anything else you think might be needed at your appointment!