By Timothy LeGendre, CPA · Florida License #AC62625 · Last reviewed 2026-05-25
Everything startup founders need to know about bookkeeping — setting up your books, DIY vs hiring, common mistakes, and when to bring in a CPA.
I wrote this guide to help startup founders understand why bookkeeping matters from day one and how to avoid the most common financial mistakes new businesses make. The guide covers six critical bookkeeping errors I see startups repeat — from mixing personal and business finances to neglecting quarterly estimated tax payments — and explains how each one can cost you money or trigger IRS scrutiny. I walk through four steps to set up your books properly, including choosing between cash and accrual accounting, opening a dedicated business bank account, selecting bookkeeping software, and establishing a chart of accounts. The DIY versus CPA section provides an honest comparison: when managing your own books makes sense, when the complexity justifies hiring a professional, and how to evaluate the true cost of each approach. I also explain what is included when you hire a CPA for monthly bookkeeping — transaction categorization, reconciliation, financial statements, and tax-ready books — and how that investment typically pays for itself through better deductions and fewer surprises at tax time.
Timothy LeGendre CPA LLC | Florida CPA License #AC62625 (firm #AD72267) | Mount Dora, FL | (407) 417-1064 | Contact
Find me on LinkedIn, YouTube, Google Business, and the BBB.