As a 1099 contractor, you can deduct all ordinary and necessary expenses related to your business. Here are some of the most common 1099 write-offs:

1. Advertising expenses
2. Auto expenses
3. Business insurance premiums
4. Contributions to retirement plans
5. Health insurance premiums
6. Home office expenses
7. Interest on business loans
8. Legal and professional fees
9. Office expenses
10. Phone and internet expenses
11. Supplies and materials
12. Travel expenses
13. Meals and entertainment expenses
14. Education and training expenses
15. Depreciation of property and equipment
16. Tax advice

Its important to note that not all expenses are deductible, and some may have limitations or restrictions. For example, car expenses can only be deducted if they are used for business purposes, and there are limits on the amount of depreciation that can be claimed for certain types of property. Additionally, some deductions may require you to fill out specific forms or meet certain criteria. Its always a good idea to consult with a tax professional to ensure that you are taking advantage of all the deductions you are eligible for.