Internet Sales Manager's Checklist for Auditing Lead Sources for Quality Monthly

Run a monthly audit of your lead sources by tracking conversion rates, cost-per-sale, and lead quality metrics from each channel. Pull data from your CRM and DMS for the previous month, compare actual vs. expected performance by source, flag underperformers, and adjust your budget or messaging accordingly. A proper audit takes 2–3 hours and catches problems before they drain your advertising spend.

Why Monthly Lead-Source Audits Matter for Internet Sales

Most dealerships spend money on lead sources without looking back. You buy leads from a marketplace, run Google ads, build email campaigns—and then you assume it's all working. Months pass. Then the general manager asks why the internet department's cost-per-unit is up 18% year-over-year.

A monthly audit prevents that conversation. You catch a lead source that's sending tire-kickers instead of serious buyers. You spot a marketplace that's double-charging you for duplicates. You notice that your organic search traffic dropped because someone turned off a high-performing campaign. These things slip past if you're only looking quarterly or—worse,not looking at all.

The best internet sales managers treat their lead sources like inventory. You wouldn't buy vehicles and never check the cost basis, reconditioning cost, or sell-through rate. Lead sources deserve the same rigor. A $2,000-per-month ad spend is $24,000 a year. A bad lead source is cash bleeding out.

The Monthly Audit Checklist: Step by Step

1. Pull Clean Data from Your CRM and DMS

Start by exporting your lead activity for the past month. You need:

• Lead source (marketplace, Google, email list, organic search, social, referral, direct traffic)
• Lead-in date
• Follow-up activity and timing
• Conversion status (sold, not sold, lost to competitor, no contact)
• Sale date and gross profit on the vehicle sold (if applicable)
• Cost paid to the lead source

This is the kind of workflow Dealer1 Solutions was built to handle,keeping lead source tracked alongside every sale so you can pull clean month-over-month comparisons without manual spreadsheet stitching.

If your DMS and CRM don't talk to each other, you'll spend an hour pulling data from one, then matching it to the other. That's not ideal, but it's doable. Set a calendar reminder to export this same report every month on the same date (the 1st or 5th works well). Consistency helps you spot trends.

2. Calculate Your Key Metrics by Source

For each lead source, compute:

• Number of leads: How many came in?
• Conversion rate: (Leads sold ÷ Total leads) × 100. What percentage became a deal?
• Cost per lead: (Total cost paid to source ÷ Total leads). What did each one cost?
• Cost per sale: (Total cost paid to source ÷ Leads sold). How much did you spend to close one?
• Average gross profit per sale: Total gross from that source ÷ Units sold.

Let's say a marketplace sent you 47 leads in December at $35 per lead. That's $1,645. You sold 6 of them. Your conversion rate was 12.8%, your cost per sale was $274, and your average gross per sale was $1,890. Those are your baseline numbers for that source in December.

Actually,scratch that, you also want to track how long those leads take to close. Some sources send you tire-kickers who take 60 days to cycle through and never buy. Others send hot leads that close in 7 days. A 9% conversion rate that closes in 14 days is better than a 12% conversion rate that needs 45 days because you're tying up BDC time.

3. Compare Month-over-Month and Year-over-Year

Don't just calculate this month's numbers in a vacuum. Pull last month and last year for the same source.

• Is your cost per sale trending up? (Red flag.)
• Is your conversion rate staying flat or climbing? (Green light.)
• Did you spend more this month? Did you get proportionally more sales?
• How does this source rank against your other sources?

Create a simple comparison table:

Lead Source	Nov Conversion %	Dec Conversion %	Nov Cost/Sale	Dec Cost/Sale	Trend
Marketplace A	11.5%	12.8%	$298	$274	✓ Improving
Google Ads	18.3%	14.1%	$156	$189	⚠ Declining
Marketplace B	6.2%	7.8%	$412	$398	✓ Slight gain

That table tells a story. Google Ads lost efficiency month-over-month. That needs investigation this week. Your primary marketplace is getting better. Marketplace B is weak overall but trending the right direction, so maybe you give it one more month before cutting it.

What to Look For: Red Flags and Wins

Red Flags

• Cost per sale up 15% or more month-over-month: Something broke. Either the lead quality dropped, your follow-up slowed, or the source raised prices. Dig in.
• Conversion rate under 5%: You're paying for window shoppers. Consider pausing or renegotiating.
• More leads in, fewer sales out: Volume up, sales flat. The leads are worse. Stop paying for that volume.
• Leads not being touched for 72+ hours: This is a BDC management issue, not a lead-source issue, but it tanks your conversion rate. If your team can't follow up fast enough, your lead source is wasted no matter how good it is.
• Duplicate leads you're paying for twice: Pull a sample of 10 leads from two different sources in the same month. Are they the same customer? If you're buying the same lead twice, renegotiate or walk.

Wins

• Conversion rate 15% or higher: That's a quality source. You can probably afford to bid higher or increase your monthly spend here.
• Cost per sale under $200: Excellent efficiency. This source is paying for itself and putting margin in your pocket.
• Average gross per sale over $2,000: You're attracting buyers with real purchase intent, not just tire-kickers.
• Leads closing in under 14 days: Your team moves faster on these, which means less holding cost on inventory and faster cash cycle.

The Three Actions You Take After the Audit

Keep, Grow, or Cut

Keep: Sources performing at or near your historical average. No change needed this month.

Grow: Sources showing strong conversion, low cost per sale, and high gross per unit. Increase budget by 15–25% the next month and watch to see if quality holds.

Cut or Pause: Sources underperforming for two months straight or bleeding cost per sale. Pause for 30 days, renegotiate terms, or kill it permanently.

Don't get attached to a lead source just because you've been buying from it for two years. Markets change. Competitors outbid you. The vendor's quality drops. You have to be willing to move money.

Flag Underperformers for Deeper Investigation

If a source dropped performance suddenly, don't just cut it. Ask why:

• Did you change your vehicle lineup? (Maybe the source is good for Civics but bad for Pilots.)
• Did your pricing move? (Customers are clicking but bouncing on price.)
• Did your BDC team turnover? (New reps might not be following up aggressively.)
• Did the source change its delivery or filtering? (Some marketplaces tweak their algorithm and quality shifts.)
• Did you run a special or promotion last month that pulled your best customers? (This month looks weak because you already moved that inventory.)

Sometimes a source deserves a second chance if the problem is on your end.

Report and Align with Management

Take your audit findings to the general manager or dealer principal in a one-pager. Show which sources are earning their keep and which are losing money. Propose your budget shifts. Get buy-in before you reallocate dollars.

A strong one-pager looks like this:

• Top 3 sources by conversion rate (and current spend level)
• Most expensive sources (cost per sale, and whether it's worth it)
• Proposed action: Increase spend on source A by $1,500/month, pause source B, renegotiate with source C
• Expected impact: "These changes should improve our overall cost per sale from $267 to $241 by March."

Tools and Setup to Make Audits Easier

If you're pulling data manually every month, you're wasting time. Set up one-time automation where you can:

• Export your lead data and sales data on the 1st of every month automatically (or set a standing calendar reminder)
• Use a shared Google Sheet or Excel template that calculates conversion rates and cost per sale automatically
• Create a visual dashboard in your DMS or a BI tool so you can see trends at a glance

You don't need fancy software. A simple spreadsheet with formulas saves you 30 minutes per month and ensures you're using the same math every time. Consistency matters more than complexity.

Common Mistakes to Avoid

Mistake 1: Only looking at conversion rate. A source with 10% conversion but $400 cost per sale is losing you money. Look at the full picture.

Mistake 2: Not segmenting by vehicle type or price range. A lead source might be great for used trucks but terrible for new compact cars. Dig one level deeper if a source is borderline.

Mistake 3: Letting one bad month trigger a panic. One down month doesn't mean you cut a source. But two down months in a row? Time to act.

Mistake 4: Auditing but not communicating. You run the audit, find problems, and then... nothing changes because the dealer didn't approve the spend shift. Build this into your monthly meeting rhythm.

Frequently asked questions

How much time should I spend on a monthly audit?

Between 90 minutes and 3 hours, depending on how many lead sources you're running and whether your CRM and DMS share data cleanly. Set aside a 2-hour block on the first Friday of the month, pull your reports, run your calculations, and you're done.

What's a "good" cost per sale for internet leads?

That depends on your market, inventory mix, and average gross profit. As a rule of thumb, anything under $250 cost per sale is solid; $250–$350 is acceptable if your gross is strong; over $350 needs scrutiny. Compare to your own historical data first,your baseline is more important than an industry standard.

Should I count leads that came in but haven't sold yet in my conversion rate?

Not in your monthly audit. Track "leads that converted within 30 days of intake" or "leads still in pipeline." Separate the two. A lead that came in this month but closes next month gets counted next month. This prevents double-counting and keeps your trends clean month-to-month.

What if a lead source is expensive but sends high-quality buyers?

Track gross profit per unit from that source, not just cost per sale. If a source costs $350 per sale but the average gross is $2,300, it's worth it. Some sources send volume; others send quality. Both can be profitable if you understand which is which.

How do I know if my BDC is the problem, not the lead source?

Run a follow-up audit: Pull a sample of 20 leads from a supposedly bad source. Check how long before your team first contacted the customer, how many touches they made, and how long the lead stayed in your pipeline. If your team touched them once and gave up, that's not the lead source's fault. If they worked it hard for 21 days with no answer, the source sent you a window shopper.

When should I increase spend on a high-performing source?

After two consecutive months of strong performance. Don't react to one good month,that could be luck. See the trend hold for 8 weeks, then increase by 15–25%. Monitor the new spend level for another month to make sure quality doesn't drop as volume rises.