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Tax guides, free.

S-Corp vs LLC vs C-Corp. Quarterly estimates. State tax registration. R&D credit. QSBS. 83(b). Plain-English.

220,000+ businesses SOC 2 Type II 4.9★ from 8,200+
File.Business · Content · Tax Guides
Free
Forever
Federal
+ state
Decision
Guides
Annual
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In a nutshell

The quick answer.

What is it?

A tax guide library covering federal and state business taxes.

Who needs it?

Founders, ops leads, CPAs comparing strategies for clients.

Why does it matter?

Tax decisions compound over years. Get them right early.

When to act?

Read before structure decisions and at year-end.

What you get

Real outcomes.

Not features — outcomes. Time saved, money saved, deadlines hit, anxiety reduced.

F

Federal + state

All angles.

S

S-Corp vs LLC vs C-Corp

Decision guide.

Q

Quarterly

Estimated taxes guide.

R

R&D credit

How to claim.

Q

QSBS

5-year holding.

8

83(b)

30-day deadline.

How it works

A clean handoff, in 4 steps.

1
Step 01

Browse.

By topic.

2
Step 02

Read.

Plain-English explanation.

3
Step 03

Compare.

Side-by-side decision guides.

4
Step 04

Ask.

BosAI for follow-up.

Why File.Business

The reasons 220,000+ chose us.

BosAI on every page. SOC 2 audited. All 51 jurisdictions. Real specialists, not bots. Compliance Subscription that pays for itself in the first missed deadline you avoid.

Federal + state

All angles.

Decision guides

S-Corp vs LLC vs C-Corp.

Specialist topics

R&D, QSBS, 83(b).

Plain-English

No jargon.

Updated

Annual.

Free

No paywall.

By the numbers

Content · Tax Guides, measured.

Free
Forever
Federal
+ state
Decision
Guides
Annual
Refresh
Customer voice

"The S-Corp vs LLC guide saved me 6 weeks of research. Read it Saturday, made my decision Monday."

E
Erik H.
Founder, Hartley AI Labs
FAQ

Common questions.

Cost?

Free.

Federal + state?

Both.

Decision guides?

Yes, side-by-side.

Specialist topics?

R&D, QSBS, 83(b), foreign withholding.

Plain-English?

Yes.

Updated?

Annual.

CPE/CPB credits?

Not currently.

Cite-able?

Yes.

Audio?

Planned.

Cited by Forbes The Wall Street Journal Inc. Bloomberg TechCrunch

Browse tax guides.

Federal + state. Decision guides. Specialist topics.

Browse tax guides today →
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