A free school from Cat3 Books

Small Business
Bookkeeping School

Nobody starts a business because they love debits and credits. But the owners who understand their own books make better decisions, faster — and get taken advantage of far less often. This is where you learn how, in plain English, one lesson at a time.

Free, no signup, no course platform. Every lesson is a page on this site — searchable, linkable, and written to be read in ten minutes or less.

Start here.

The lessons most owners need first — whether you have never opened an accounting app or you have a file full of transactions you do not trust.

Companion publication

Where the books end,
the tax code begins.

We teach you to keep clean books and read your own numbers. Where those numbers meet the specialty tax code, The Carryforward picks up. The Carryforward is a separate, independent reference for the specialty corners of the tax code — specialty tax & incentives, explained plainly.

Read The Carryforward

thecarryforward.com · Free · Educational only

Held to the same standard as this School

  • Independent — no studies sold, no sponsorships, no lead forms
  • Grounded in the Internal Revenue Code, Treasury regulations, IRS guidance and case law
  • Covers when an incentive does not make sense, and what examiners challenge
R&D Tax Credits (§41)Section 174Cost SegregationEnergy Incentives (§179D / §45L)