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Start here · The flagship guide

The STR Entity Foundation Guide

Why 'just form an LLC' is the wrong start, and how separating the property, the operations, and the owner gives you one frame for liability, taxes, financing, and a growing portfolio.

New to Builders Finance? Start here. This guide introduces the whole Entity Structure system, and links to every supporting guide you'll need as you put it in place.

Reading time14 min
Edition2026.1
AuthorMatt Nunn
Living reference — kept current as rules, tools, and operating practices change.
What it covers
  • The three-separations frame
  • What each separation protects
  • Right-sizing structure to your stage
  • Where every decision fits
Read the Foundation Guide →

Start with the flagship above — everything else in Entity Structure supports it.

Supporting guides

The guides, in order

In dependency order — Separate the property, the operations, and the owner.

01
Property

The Three Separations & the Single-Member LLC

The frame the whole domain runs on — and how an LLC actually holds the asset.

02
Owner

Insurance vs. the LLC — Two Layers

Insurance pays claims; the LLC contains what's left. You want both.

03
Operations

The Management-Entity Layout

When the business warrants its own entity, and how S-corp fits.

04
Portfolio

Structuring a Growing Portfolio

Isolating multiple properties, and putting co-ownership in writing.

Browse all Entity Structure guides chronologically →
Decision guides

When there's a real choice

Judgment calls, not how-tos — each weighs the options for your situation.

Decision Guide

Should I Put My STR in an LLC?

What an LLC does and doesn't protect, and whether it's worth it for your stage.

Work through it →
Decision Guide

Should I Elect S-Corp Status?

Only for substantial-services STRs — how the SE-tax math works and when it backfires.

Work through it →
Decision Guide

How Should I Structure a Growing Portfolio?

Separate LLCs, a Series LLC, or a holding company — matched to what you can finance and reliably maintain.

Work through it →
Templates & tools

High-Value Resources

The guide teaches; the tool implements.

Pillar Guide

Entity Comparison Matrix

The five decision layers — legal structure, tax, insurance, separateness, financing — on one reference sheet.

Pairs · Structure your STR
Decision Guide

Pre-Formation Checklist

Decide, insure, check financing, form, then make the boundary real — in order. Fillable.

Pairs · Put it in an LLC?
Concept Guide

Operating-Agreement Essentials

The co-owners' decisions to put in writing — capital calls, guarantees, buy-sell. Fillable.

Pairs · Multi-Member LLCs
The Informed Operator

Stay ahead of the changes.

A weekly email on the financial side of short-term rentals — what changed, why it matters, and what owners should understand. Plus the STR Tax Mistake Checklist.

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Further Reading

Deeper articles that complement the core curriculum.