Learning how to split your ad budget across platforms is what separates businesses that scale from ones that just spend. The instinct is to spread money everywhere so you "cover all your bases" — that's exactly the mistake. A small budget spread thin learns nothing. Here's a simple, honest framework for dividing your spend without lighting it on fire.
Rule one: don't split too early
If you're spending under about $1,000 a month, you probably shouldn't split at all. Put it all on the single channel most likely to reach ready buyers — usually search — and prove it works. Spreading $500 across three platforms gives each too little data to optimize, so all three underperform and you can't tell why.
Concentrate first. Split later, once you have money and a proven winner.
The 70/20/10 starting point
Once you've got enough budget to divide, a workhorse framework is 70/20/10:
- 70% to your proven channel — the one already producing customers at a cost you're happy with. This is your engine; feed it.
- 20% to a scaling channel — a second platform showing promise that you're growing into.
- 10% to testing — new platforms, new audiences, experiments. Expect most of these to fail. That's fine; the 10% is tuition.
Adjust the numbers to your reality, but the principle holds: most money on what works, some on what's growing, a little on learning.
Match platforms to how people buy
Don't split evenly for the sake of fairness. Weight toward where your customers actually decide:
- Search (Google): Captures existing demand. For most local service businesses, this earns the biggest share.
- Social (Facebook, Instagram): Creates demand and retargets. Strong secondary channel.
- Everything else (TikTok, Reddit, etc.): Testing money until proven, not core budget.
If you're not sure which deserves the lead share, our guide on paid search vs paid social and which comes first walks through it.
Let the numbers move the money
The split isn't set-and-forget. Every month, look at cost per lead and cost per customer by channel, then shift money toward whatever's producing customers cheapest. If search is delivering leads at $30 and social at $80, move budget to search until that changes. Discipline here beats any clever strategy.
Don't forget the foundation
Paid ads all point to your website. If that site is slow, thin, or invisible in organic search, every dollar works harder for less. A little spent on your SEO and AI score and fixing what it flags makes every paid channel convert better — it's the multiplier under all of this.
A simple monthly rhythm
- Check cost per customer by channel.
- Shift money toward the cheapest reliable channel.
- Keep the 10% test bucket running.
- Kill anything that's been losing for two months.
The bottom line
Splitting your budget isn't about being everywhere — it's about putting most of your money where it already works, a little where it might, and constantly moving dollars toward results. Start concentrated, expand deliberately, let the numbers decide.
If tracking cost per customer across platforms and reallocating every month sounds like more than you signed up for, that's precisely the work Arbor handles when we run your ads. There are more growth guides if you want to sharpen up before you spend.