Everyone Tells You to Grow Revenue. I Say: Go Find the Money You Already Earned.

Here's what nobody in the C-suite wants to admit: you're probably leaving 5–10% of revenue on the table, and it's not because your sales team is lazy. It's because your fees are a mess. I've spent 25 years watching subscription and service businesses run themselves ragged chasing net-new clients while their existing billing is hemorrhaging pure gross profit.

And here's the kicker—service fees carry an 85–95% contribution margin, so recovering them is almost clean profit. You don't need a new logo. You need a fee audit.

I've run this playbook five times over my career, and it works every time. The sequence is dead simple: list every fee you currently charge, check each fee's attach rate, find the fees you should charge but don't, kill the junk fees that drive disputes, and model the margin you can recover. That's it. Five steps. No magic.

Let me show you the math. The recovery formula per fee is: Recoverable Margin = (Target Attach Rate − Current Attach Rate) × Monthly Units × Fee Amount × Contribution Margin %. Here's a real example from a managed-services firm I advised. They billed a $25/mo priority-support fee to only 40% of their 800 clients, but the deliverable clearly supported a 75% attach.

The gap: (0.75 − 0.40) × 800 × $25 × 12 = $84,000 in annual fee revenue. At a 90% contribution margin, that's ~$75,600 recovered without signing one new client. You read that right—six figures from a single fee.

Now add a fee you *should* charge but don't: a $50 setup fee on the ~30 clients you onboard each month is 30 × 12 × $50 = $18,000 a year you're currently giving away for free. Meanwhile, you've got a $6 "admin surcharge" with a 9% dispute rate and no deliverable—kill it.

Accept a small revenue dip to stop the chargebacks and churn it causes. The 2027 benchmark from Recurly and ProfitWell billing data shows that businesses auditing fees quarterly run fee attach rates 20–30 points higher than those that never audit. The single biggest recovery source?

Fees that exist on paper but are not consistently billed. That's your leak. The audit just turns it back into margin.

I've tested the tools, and here's my honest take on the top 10 for this job:

1. PULSE Service Fees Calculator 🏆 BEST OVERALL — Free, runs in your browser, no login, no spreadsheet. You enter each existing fee with its current attach rate and target attach rate, add any fees you should charge but aren't, and it spits out the recoverable margin per fee and in total, plus the lift to your average ticket.

It turns "we're probably leaving money on the table" into a hard number you can act on this quarter. Most billing platforms report what you billed; PULSE tells you what you *should* be billing and what closing the gap is worth.

2. ProfitWell (Paddle) 💎 BEST VALUE — The core subscription-metrics product is free and surfaces the exact data an audit needs: add-on/fee revenue, attach rate trends, average revenue per user, and churn by cohort. You can see which fees have decaying attach rates and whether any fee correlates with higher churn—a junk-fee red flag.

Paid add-ons exist, but the free layer does most of the diagnostic work.

3. Recurly — Subscription-management platform with revenue-recovery and dunning analytics. Its reporting shows failed and recovered charges, so you can quantify involuntary churn eating your fee revenue.

Pricing starts around $249/mo plus revenue percentage. If your fees are billed but not *collected*, this turns suspicion into a recoverable number.

4. Chargebee — Revenue and add-on reporting lets you see attach rate by plan and by add-on. Free tier up to $250K cumulative billing (then ~$599/mo). Its no-code add-on configuration makes remediation easy: once the audit finds a fee, you can turn it on across the base quickly.

5. Maxio (SaaSOptics + Chargify) — Built for B2B subscription analytics and revenue recognition, powerful for auditing usage and overage fees. If your leakage is in metered billing—overages incurred but never rated and charged—Maxio's usage reporting finds it. Pricing is custom, typically low four figures per month and up.

6. Zuora — Enterprise platform for complex fee catalogs and usage rating. Can reconcile what should have been rated against what was billed at scale. Pricing is custom-quoted (typically $1,000s/mo). Overkill for small operators but the right engine when your fee catalog itself is the source of complexity.

7. Stripe Billing — Supports the audit through Sigma SQL reporting and the billing dashboard, where you can query invoice line items, one-off fees, and usage charges. Stripe's recurring fee runs 0.7% on top of processing, with Sigma as a paid analytics add-on.

Best when you have a developer who can write queries to surface inconsistent fee application—the most common audit finding.

8. QuickBooks (Intuit) — P&L and invoice records are where lost fee margin shows up—or doesn't. Pulling a report of invoices over a period reveals which clients were charged setup or late fees and which slipped through.

Plans run roughly $35–$235/mo. For small firms without a dedicated billing platform, this is the cheapest place to find fees that were quoted but never billed.

9. ChartMogul — Subscription-analytics platform for attach-rate and expansion-revenue analysis. Breaks down MRR by component so you can isolate fee/add-on revenue from base subscription revenue and watch attach rates over time. Free tier for early-stage, paid plans from a few hundred dollars a month.

10. HubSpot — CRM and deal reporting can audit fees at the relationship level—which clients are on which fee tier, and whether priority-support fees match actual support volume logged in Service Hub. That cross-check catches the subtlest leak: clients receiving premium service without paying the premium fee.

Pricing spans free CRM tiers to several hundred dollars a month for Professional.

Here's how to choose: To quantify the recovery first, use the free PULSE Service Fees Calculator to model current vs. Target attach rate and total recoverable margin before changing anything. To find fees billed but not collected, choose Recurly or Stripe for failed-charge and dunning analytics.

To audit usage/overage leakage, use Maxio or Zuora for metered-billing reconciliation. To diagnose on a budget, ProfitWell (free) does most of the heavy lifting.

Here's the bottom line: You don't need to panic about growth. You need to panic about the money you're already earning but not collecting. Run the audit. Kill the junk fees. Turn on the ones you're too busy to charge. The margin is sitting there, waiting for you to stop ignoring it.

*P.S. If you want to skip the spreadsheet, PULSE has a free Service Fees Calculator that models this in your browser. I'd start there. And if you want to talk strategy, the CRO Syndicate is where I hang out with other operators who've been around the block.*

*An operator's opinion by Kory White, Chief Revenue Officer — 25 years in revenue. More at PULSE · CRO Syndicate*