How Do I Know Which Leads Actually Came From Which Marketing Thing I Did?

You sponsor a local event, send a referral email, post on LinkedIn, run a small Google Ads campaign, and ask existing customers for introductions. A month later, leads have come in—but you cannot tell which effort brought the good ones.

Someone says, "The event seemed to work." Someone else says the ads did. Your CRM has a few sources, many blank fields, and several leads marked "website" even though they clearly came through a partner referral.

That makes marketing feel like a string of expensive guesses.

You do not need a complicated attribution model to fix this. You need a simple way to record the original source when a person first enters your world, preserve it, and connect it to the deal when they become a real opportunity.

Track the first source, not every touch

A small business owner usually needs to know three things:

1. How did this person first hear about us?
2. Which source created qualified conversations?
3. Which source turned into revenue?

Start there.

Create a short, controlled source list. For example:

• Referral
• Google search
• Paid Google ad
• LinkedIn
• Local event
• Partner
• Existing customer
• Website direct
• Other

Your list should match the ways you actually market the business. If you only run one paid channel, do not create fifteen ad-related options. If referrals matter, do not bury them under "Other."

Capture the original source on the contact record and the deal source on the deal record. In many cases they will match. Sometimes they will not. A past customer may first come from Google but create a new deal after a referral campaign. Keeping those two ideas separate lets you learn without rewriting history.

Make source capture easy enough to happen

A source field that is 20% complete is worse than no field at all. Your report will look official, but it will reflect whoever happened to remember to fill it in.

For web forms, ask a simple "How did you hear about us?" question only if you cannot reliably capture the source another way. Keep it short. If the form has twenty options, people will choose the first one.

For phone leads and referrals, teach the team one question: "Who can I thank for connecting you with us?" Add the answer during the first conversation, not after the deal is already in proposal stage.

For imports, include source in the spreadsheet before it enters the CRM. "Imported list" is not a useful marketing source unless the list itself is the campaign you are evaluating. "Chamber breakfast, May 2026" is useful.

Do not make source a free-text field. "Google," "Google Search," "searched online," and "internet" become four separate categories, and your report becomes a manual cleanup job. Use one dropdown with defined values.

Use tags for campaigns, not as a substitute for source

This is where tags help.

Tags group contacts by category. Custom fields store structured, filterable data. Your original source should be a structured field because you need consistent reporting. A campaign tag can add context: "Spring referral push," "2026 chamber event," or "September newsletter."

Use both for their distinct jobs, not interchangeably.

A practical ceiling is five to seven tags per contact. Review and prune tags every six months. If every small action creates a permanent tag, the tag list will become as confusing as a free-text source field.

For example, a contact can have:

• Source: Referral
• Campaign tag: Summer customer-introduction email
• Service interest tag: Bookkeeping

That is useful. It tells you the person came through a referral, which effort prompted it, and what they care about.

Measure qualified leads and wins, not just form fills

A channel that sends 100 weak inquiries may look better than a channel that sends 10 excellent referrals if you only count lead volume.

Set one definition for a qualified lead. Maybe it means the prospect fits your service area, has a real need, and has booked a discovery call. Then measure each source against that definition.

At the end of each month, review:

• New contacts by original source
• Qualified deals by source
• Closed-won revenue by deal source
• Average deal size by source

You do not need a giant dashboard. A simple monthly report with four rows can change how you spend next month's marketing budget.

If source is blank too often, do not blame the report. Fix the point where the information should have been captured. Usually that is a form, an import process, or the first sales conversation.

Key takeaway

You don't need multi-touch attribution — you need one clean original-source field, captured consistently, tied to qualified leads and revenue.

Next step: Choose no more than eight lead-source options today and add them as a required dropdown for new qualified contacts and new deals. For the next 30 days, review every new deal at your weekly pipeline meeting and fill in the source before moving on to the next item.