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Last-Click Attribution Is Lying to Your Budget

September 19, 2026

PPC Hero made the case this week for incrementality testing: instead of trusting last-click attribution, you run holdouts and measure what actually changes when the spend disappears. Simple idea. Almost nobody in multifamily does it.

Here's why that matters for your 2027 budget. Last-click attribution hands the credit to whoever touched the lead last, usually a listing site, because the prospect searched your community name after already deciding to tour. That's not the ILS driving demand. That's the ILS collecting a receipt for demand you already paid to create somewhere else. Your CRM is doing improv and filing it as data, and every renewal conversation with a vendor rep is built on that improv.

Incrementality testing asks a meaner question: if you turned this channel off for four weeks, would leases actually drop? For paid search, that's testable. Pause branded search in half your markets, keep it running in the other half, compare lease volume. If nothing moves, you've been paying Google to intercept people who were coming anyway.

Do this before you sign next year's ILS contracts, not after. A geo holdout on your top two listing sites for a month will tell you more than any attribution dashboard they hand you. It costs you a little short-term data noise. It's worth it to stop grading vendor homework using a rubric the vendor wrote.

Unknown: whether any major ILS will let you structure a clean test against their own platform without pushback. Ask anyway.

Source: PPC Hero, September 16, 2026