
Self-insurance costs fall into two categories:

Fixed Costs
1
State application or filing fees:
These will vary from $100 to over $1,000.
2
Self-insurance bond:
$15 to $45 per $1,000 of bond amount.
3
Letter of Credit:
1% to 2% of amount of LOC. (each state requires a bond or LOC as assurance that funds will be available to pay future claims).
4
Claims administration and loss control:
8% to 13% of standard workers' compensation premium (often charged "per claim").
5
Excess Insurance:
9% to 13% of standard workers' compensation premium (combined specific and aggregate coverage).

Variable Costs
1
Claims:
Paid as necessary. A qualified broker or insurance consultant can help you project estimated future claim costs based on your past experience.
2
State taxes and assessments:
These also may vary by state, but are usually
1% to 4%
of either incurred or paid losses or manual workers' compensation premium. In some states these are a set amount and would be in the "fixed cost" category.