Partnership Marketing: A One-Page Sheet Before You Start

Every partnership marketing deal answers three questions, whether or not anyone asks them out loud: who sends the message, who pays for it, and who counts what comes back. Small business partnerships usually stall because two owners agreed on the idea in a friendly conversation and never agreed on those three answers. The idea survives; the follow-through does not.

HubSpot’s explainer on co-marketing defines it as two or more companies working together so each benefits from the combined effort, and lists formats including ebooks, guest posts, webinars, videos and events. That list tells you what a partnership can look like. It does not tell you how to keep it from going soft in week three. What follows is a one-page sheet with six lines. Both owners fill in every line before a single post, email or flyer goes out.

Line 1: The shared customer

Pick a partner by the customer, not the product category. Finish this sentence out loud: someone who just bought from me next needs ___, and my partner sells it. If the blank takes more than a few seconds to fill with a specific thing, the partnership is a favor, not a plan. That test is ours, not a published method, but it is a cheap way to catch the most common failure before it costs anything.

Two small-business examples in Shopify’s roundup of collaboration ideas (published December 20, 2024) show what a shared customer looks like in practice. Cheerfully Made Goods, Kentfield Kids and nine other shops in Almonte, Ontario split one monthly magazine ad page between them. Third Shift Vintage worked with six other vintage-store owners on gift guides, coordinating over Slack.

Hypothetical, for illustration: a bakery and a coworking space share a customer, the person who works from the same building five days a week and wants a reason to leave their desk at 3 p.m. Line 1 would read: “People who work in this building and want a midday break.”

Line 2: The one offer

Write one offer, with one end date, in the same words on both sides. Two offers split attention and give nobody a reason to act this week. If the offer works as a sign-up (a guide, a tasting, a trial), the same logic applies as in our playbook on targeted lead magnets: name the exact buyer and make the offer fit that person.

Hypothetical: “Show your coworking badge at the bakery counter before the end of the month for a free coffee with any pastry.” One sentence, one condition, one end date.

Line 3: Who sends

Swapping email lists feels like doubling your reach. Do not do it. Each partner should send the offer to its own list, from its own name, with its own unsubscribe link.

The reason is on the FTC’s page. In its CAN-SPAM compliance guide for business, the agency says that when an email carries information from more than one company, the business that is identified in the “from” line and is promoting its own goods or services counts as the sender responsible for compliance. The same guide says each separate email in violation can draw penalties of up to $53,088 and that more than one person may be held responsible. It also says opt-out requests must be honored within 10 business days, and that once people have opted out you cannot sell or transfer their addresses, even as a mailing list. A list you hand to a partner is a list you may no longer be able to control.

Our take, beyond the legal minimum: people gave their address to one business, and a pitch from a stranger’s brand arriving under that business’s name spends a trust the owner built over years. Sending to your own list, under your own name, keeps that trust where it belongs. If the offer collects sign-ups, tell people on the form who will receive them. This is not legal advice; for anything beyond the basics, ask your email provider or an attorney.

HubSpot’s explainer says both partners share the downloads from a joint offer and so get twice the leads they would normally get. Read that as the best case. It assumes both partners promote with equal energy, and it is written by a company that sells marketing software.

Line 4: Who pays

Write the split in dollars before any work starts. The best illustration in the Shopify roundup is Emily Arbour, owner of Cheerfully Made Goods, on the shared magazine page: “Instead of it costing us a thousand bucks, we each pay $80 a month.” The point is not the number; it is that every shop knew its share before the ad ran.

If the deal is a fee or free product in exchange for promotion, one more rule applies. The FTC’s Disclosures 101 guide for social media influencers says a material connection includes a financial relationship, such as a brand paying someone or giving them free or discounted products, and that the disclosure must be hard to miss and placed with the endorsement itself. Put the disclosure wording on the sheet. If your deal is a per-customer referral fee instead of a shared promotion, that is a different structure, covered in our Small Business Partnerships: A 30-Day Referral Build.

Line 5: Who counts

Give each partner its own way to be counted, and agree on what counts. We suggest a redemption (someone actually used the offer), not a click or a like. Three ways to do it, depending on where your customers buy:

• A tagged link. Google’s Campaign URL Builder adds utm_source, utm_medium and utm_campaign to a web address so traffic can be attributed. Google Analytics states it is free of charge.
• A code at checkout. Shopify supports discount codes, so each partner can have its own. As read on Shopify’s pricing page on October 4, 2026: Basic is $39 a month billed monthly or $29 a month billed yearly, with a trial of 3 days free and then $1 a month for 3 months.
• A tally at the counter. For in-person sales, the free option is a tally sheet by the register, or your point-of-sale system’s discount feature if it can name a discount per partner. Check that before you promise a partner a number.

HubSpot advises comparing the lead-to-customer conversion rate of a joint campaign against your solo campaigns. That is the right comparison, and it only works if line 5 produced a real count. If you have never priced your own acquisition, our post on customer acquisition cost: count hours, not just cash shows how to include the hours you spend on a partnership.

Line 6: The exit

Decide, in writing, when the partnership ends and who decides to continue. Put the end date on the offer itself. Then set a review date and a stop rule that each owner writes in their own words, such as the number of redemptions below which you will not run it again. A partnership with no exit is a standing obligation, and the person who most wants out will say nothing until it is a grievance.

A partner who won’t fill in line 6 has told you something useful, and it cost you one conversation.

Where AI helps, and where it stops

An AI assistant such as ChatGPT, Claude or Gemini can draft the sheet, tighten the offer wording and write the outreach note to a partner, and the owner approves every line. It cannot know whether your partner’s customers are really your customers; only the two of you can answer line 1. The same goes for lines 3 and 4, which depend on your email setup, your margins and your partner’s willingness to be counted.

BusinessPrompter lists a Pro prompt called Partnership Marketing Strategy, summarized on its page as “Develop co-marketing strategies with complementary businesses.” The prompt itself sits behind a Pro upgrade, so we have not run it and will not describe its steps. One caution from reading the page: its “About This Prompt” panel currently describes a long-term vision document rather than partnership marketing, which looks like a mismatch on that page, so go by the title and the one-line summary.

Your next step this week: send lines 1 and 6 to one prospective partner and ask them to fill in their half. If both owners can answer those two in a single message thread, the rest of the sheet will go quickly.