Where Should the Next $100,000 of Marketing Budget Go? A Four-Step Test

A growth consultant who audits B2B SaaS marketing budgets says the best use of an extra $100,000 is often not paid search but onboarding, retention and AI search visibility. The author lays out the process in a first-person analysis built around a composite Series A client. "Fieldline" is fictional, but the numbers come from real client patterns, the author writes.

Why does paid search usually win the budget?

After a good quarter, CEOs ask the author a version of one question: "We have another $100,000. Where should it go?" Most already have an answer. It is more of what worked last quarter, which usually means paid search, "because paid search has the cleanest dashboard." The money lands on what already works. The constraint on growth goes unfunded because it belongs to no single channel.

What does the hypothetical reveal?

Fieldline is a B2B SaaS scheduling vendor for home services firms with 20 to 200 employees. It has $8 million in ARR and a $24,000 average contract value. Marketing spends $90,000 a month: $45,000 on paid search, $20,000 on content and SEO, $10,000 on events, and $15,000 on tools and contractors. The board approved an extra $100,000; the VP of Marketing wants $60,000 for paid search and $40,000 for content.

The first step maps the entire funnel over 90 days, past closed-won. Fieldline's month: 40,000 site visits convert at 0.9% to 360 demo requests; 50% become sales-accepted leads (180); 50% become opportunities (90); 20% close (18 deals); 78% remain active at month 12.

Two numbers stand out. A 20% win rate is low for a $24,000 sales-led product. And 22% first-year churn means "nearly $1.8 million in annual revenue walking out the back door, most of it in the first 90 days." Neither figure appears on the marketing dashboard, which showed traffic up 14% with flat cost per demo.

What is each option worth?

The author prices every competitor for the money:

• Paid search: $60,000 buys roughly 3,300 non-brand clicks at $18 each, yielding one or two deals and about $36,000 in new ARR.
• Conversion rate optimization: lifting the demo rate from 0.9% to 1.1% adds roughly $1.1 million in annual ARR for $15,000 — the best ratio on the list, if the tests hit.
• Retention: cutting first-year churn from 22% to 16% preserves about $480,000 a year.
• AI search visibility: Fieldline appears in 5 of 20 answers to its five main buyer prompts across ChatGPT, Gemini, Perplexity and Google's AI Mode; competitors appear in 15 and 12. Each point of win rate is worth about $260,000 a year.
• More content: unlikely to move win rate or churn. Customer research is the cheapest option and validates the other estimates.

How does the $100,000 get spent?

The author first spends 10% on research: 15 interviews with recent buyers, 10 with customers who churned inside 90 days, a review of 30 Gong sales calls, and an AI-assisted "How did you hear about us?" form field. The finding: churned customers left before field technicians used the mobile app, and 9 of 15 won customers built shortlists in ChatGPT, where Fieldline's two visible competitors won the lost deals.

The allocation: $30,000 to onboarding and lifecycle, $30,000 to AI search visibility (entity cleanup, comparison pages, digital PR), $15,000 to demo-flow CRO, $15,000 held in reserve until day 45. Paid search gets nothing extra and nothing cut. Each line has one kill metric; if technician activation has not moved by day 45, the $30,000 returns to the pool.

The author's closing instruction: "Before your next budget meeting, put retention on the same page as traffic and see which number you'd fund first." The gap between marketing's top of the spreadsheet and finance's bottom, the author argues, is usually where the next $100,000 belongs.