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.

Aug 15, 2026 · 9 min read

How Surplus Lines Filings Actually Reach Each State

Every vendor says "all 50 states." Very few say which states are true electronic filing and which are a person typing into a portal. Here is the honest map (API, portal automation, batch workbook, or prepared filing) and what each one means for your month.

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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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