TheSpringSaleYouShouldn'tRun

January ends. Revenue dips. Someone on the team says: "Should we run a spring promotion to get things moving?"

It sounds reasonable. Sales are soft. A 20% off promotion will spike conversions, generate some cash flow, and give the team something positive to report. What's the harm?

The harm is structural. And it compounds.

What discounting trains

Every promotion teaches two things: customers and algorithms.

It trains customers to wait

If you run a Black Friday sale, a January clearance, and a spring promotion, you've told your customers that full price only lasts 6-8 weeks at a time. They learn the pattern. They wait. They add to basket, leave, and come back when the next promotion arrives.

This is measurable. Brands that run frequent promotions see declining full-price conversion rates over time. Not because the products are worse - because customers know a sale is coming.

It trains Smart Bidding to expect promotions

Google's Smart Bidding algorithms learn from historical patterns. If you run promotions regularly, the algorithm learns that promotional periods generate higher conversion rates. It starts to expect them. When you return to full-price selling, the algorithm sees a drop in conversion rate and responds by either increasing CPCs to maintain volume or reducing impressions because it expects lower returns.

In other words, your promotions are creating a dependency. The algorithm performs best during sales because you've trained it to. And it performs worst at full price because the full-price data always looks worse by comparison.

The margin mathematics

A 20% discount on a product with a 50% gross margin doesn't reduce your profit by 20%. It reduces it by 40%.

Consider a £100 product with a 50% margin:

• Full price: £100 revenue, £50 gross profit
• 20% off: £80 revenue, £30 gross profit (COGS remain the same at £50)
• Profit reduction: 40%, not 20%

To generate the same gross profit at 20% off, you need to sell 67% more units. That rarely happens. And even if it does, the fulfilment cost of 67% more orders further erodes the economics.

Most spring promotions don't increase volume enough to offset the margin erosion. They just convert people who would have bought at full price into discount buyers.

When a Q1 promotion does make sense

• Clearing genuine excess inventory. If you have dead stock from Q4 that's tying up cash and warehouse space, a targeted clearance makes commercial sense. But run it as a separate campaign with its own margin targets - don't discount your entire catalogue
• Acquiring genuinely new customers. If the promotion is targeted exclusively at new customer acquisition with a known CAC target and LTV model, it can be justified as an investment. But "20% off sitewide" doesn't qualify
• Category-specific seasonal relevance. If you sell garden furniture and spring is your peak, a launch promotion to capture early-season demand is different from a desperation discount

What to do instead

• Sell harder, not cheaper. Improve your product pages, your ad copy, and your shopping feed. The conversion rate improvement from better creative often exceeds the conversion rate boost from discounting - without the margin hit
• Focus on full-margin hero products. Instead of discounting everything, put more budget behind the products that sell well at full price
• Use Q1's lower CPCs to test. The cheaper clicks make this the perfect time to experiment with new products, new audiences, or new creative - all at full margin
• Let competitors discount. While they race to the bottom, maintain your positioning and capture the customers who value quality over price

The spring sale feels like a solution. It's usually a habit. Break it, and your full-year margin profile improves.