Quick question before you scroll: what did it cost you to acquire your last customer? If the answer is "uhh, whatever I spent on ads divided by... something" — this post is for you. Everybody talks about customer acquisition cost. Almost nobody can calculate it, because their books aren't set up to answer the question. Here's the fix, and it starts in a place nobody wants to look: your chart of accounts. I split all marketing-related spend into three buckets in QuickBooks: 𝟭. 𝗠𝗮𝗿𝗸𝗲𝘁𝗶𝗻𝗴 𝗖𝗔𝗖 — direct costs to acquire a customer. Ads, paid lead sources, attribution tools. If it exists to get a stranger to raise their hand, it goes here. 𝟮. 𝗦𝗮𝗹𝗲𝘀 𝗖𝗔𝗖 — the cost to convert those leads. This is the one everyone misses. Sales staff, the answering service, the assistant who follows up on quotes. If a person only sells part-time, I split their cost proportionally by how much of the role is actually selling. 𝟯. 𝗠𝗮𝗿𝗸𝗲𝘁𝗶𝗻𝗴 𝗢𝘃𝗲𝗿𝗵𝗲𝗮𝗱 — brand presence stuff. Website, content tools, the things that make you look legit but don't directly produce a customer. Keeping this separate stops it from polluting your CAC number. That's it. Now the monthly report totals drop straight into a simple dashboard, and I get a rolling 12-month CAC — split by one-time customers, recurring customers, and blended. Why bother? Because once you know the real number, ad spend stops being a leap of faith and becomes a dial. My blended CAC right now is $118.73, and my lifetime gross profit per customer runs 16x that. When you know you get $16 back for every $1 in, "should I spend more on marketing?" answers itself. You can't manage what you can't measure — and you can't measure what your bookkeeping lumps into one bucket. So: do you actually know your CAC? And if not — what's stopping you from setting this up this month?