Surplus Lines Filing Resources

Guides written for MGAs, wholesalers, and retail brokers who actually have to file. Filing-platform overviews, compliance checklists, and detail on how SLTax360 itself works under the hood.

May 13, 2026 · 7 min read

Surplus Lines Tax Calculator — How It Works

Where the rates come from, how the math is done, and how the free public calculator differs from the production REST API used inside SLTax360.

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