Open Meta Ads Manager, Google Ads, and TikTok Ads Manager side by side and add up the "purchases" or "conversions" each one is claiming credit for. Now compare that total to what your bank account actually shows in new revenue for the same period. If you're spending real money across more than one platform, there's a good chance the platforms are collectively claiming more conversions than your business actually generated.
That's not fraud. It's not even really a bug. It's the predictable result of every platform running its own attribution model, on its own tracking pixel, with every incentive in the world to credit itself for a sale it merely touched. Nobody upstream is reconciling the numbers for you — that's on you, or on whoever's running your reporting.
Why platform-reported numbers can't be trusted blindly
Each platform's attribution window is generous by design. A 7-day click / 1-day view window (Meta's old default, still common) will happily credit an ad for a purchase that happened because someone saw a retargeting ad, ignored it, then came back three days later after a Google search for your brand name. Google will claim that same purchase under branded search. TikTok might claim it too, if the person saw a video days earlier. Three platforms, one sale, three "wins."
This is why a business running $20K/mo can look at platform dashboards and see a blended ROAS that implies they should be growing 40% a quarter — and then look at their actual bank balance and see something much more modest. The gap isn't a mystery. It's math nobody did.
None of this means the platforms are useless for reporting. It means you can't use any single platform's dashboard as your source of truth for whether the business is actually growing. You need a number that doesn't care which channel wants credit.
MER and nCAC: the numbers that don't lie
Marketing Efficiency Ratio (MER) is total revenue divided by total marketing spend, full stop — no attribution model, no platform politics. If you spent $30,000 across every channel last month and did $120,000 in revenue, your MER is 4.0. It doesn't matter which platform "gets credit" for which sale; the number is anchored to what actually happened financially.
New Customer Acquisition Cost (nCAC) is total spend divided by new customers acquired in the period — not "conversions," not "purchases" (which double-count repeat buyers), specifically new customers. This is the number that tells you whether your growth engine is actually getting more efficient or whether you're just spending more to stand still.
Track both over time, blended across all channels, and you have a number that's honest by construction. It can't be gamed by an attribution window, because it isn't using one.
Building a reporting setup you can trust
- Get GA4 configured correctly. Most GA4 implementations are broken in small, compounding ways — duplicate events, missing conversion tagging, sampling issues on high-traffic properties. An audit before you trust any GA4 number is not optional.
- Move to server-side tagging where you can. Browser-based pixels lose more data every year to ad blockers, Safari's Intelligent Tracking Prevention, and third-party cookie restrictions. Server-side tagging (via Google Tag Manager's server container, for example) recovers a meaningful chunk of that lost signal.
- Build one blended dashboard. MER, nCAC, and revenue by channel (self-reported, clearly labeled as such) side by side — not five separate platform dashboards you have to mentally reconcile every Monday.
- Separate "platform-reported" from "actual." Keep both numbers visible. The gap between them is itself useful information — a growing gap usually means attribution windows are getting more generous (or your tracking is degrading), not that performance is improving.
- Revisit quarterly, not never. Tracking setups drift. A pixel someone "fixed" six months ago for an unrelated reason can quietly break a conversion event and nobody notices until reporting looks weird for a month.
The questions this actually answers
Once you have a trustworthy blended view, the questions you can answer change. Instead of "is my ROAS good," you can ask: is my MER trending up or down over the last two quarters? Is nCAC rising faster than my average order value is growing? Are we actually more efficient than we were six months ago, or does it just feel that way because one platform's dashboard looks better?
Those are the questions that actually determine whether the business is compounding or just spending more to stay flat. Platform dashboards were never built to answer them — they were built to keep you spending inside that platform.
If your reporting setup can't answer "are we actually more efficient than last quarter" with a straight face, that's a tracking and attribution problem before it's a media problem — see Analytics & Reporting for how we build the blended view most accounts are missing. Or book a growth audit and we'll show you the gap between what your platforms claim and what your bank account says.