What winning a line review actually costs: slotting, free fill, MDF, and TPR.

The hardest cost in retail isn't the cost of goods. It's the cost of winning shelf space — and most founders don't see it until the first invoice arrives, sometimes ninety days after the line review.

This post is the punch list of what actually comes out of your bank account when you win a national program, in roughly the order you'll see it. None of these numbers are public, all of them are negotiable, and every one of them needs to be in your gross-margin model before you sit down at the line review.

The four buckets of post-win cost

Every retail program win produces four categories of vendor expense that don't appear in your wholesale price:

1. Slotting fees — the up-front cost of space on the planogram.
2. Free fill — the first PO, sometimes free or deeply discounted, that fills the DCs and stores.
3. Market Development Funds (MDF) — the percent of net sales the retailer expects you to fund for marketing, advertising, and category support.
4. Temporary Price Reduction (TPR) co-pay — the dollars you commit to fund the retailer's price promotions during the program year.

Together these four buckets routinely add 12–22 points of effective margin compression on top of your wholesale price. A 35% gross-margin SKU at the wholesale level frequently lands at 18–22% margin after the program is fully loaded. If you didn't model that, you didn't model anything.

Slotting fees: what's actually charged

Slotting is the entry ticket. You're paying the retailer to physically allocate shelf space and to set up the SKU in their item master, planogram, and DC. The numbers are highly category- and retailer-dependent, but here are realistic 2026 ranges for automotive aftermarket:

• Walmart: $5,000–$25,000 per SKU for most automotive consumables; up to $50,000+ for hot end-cap or aisle-feature placement. Often waived or reduced for established vendors.
• AutoZone, O'Reilly, Advance: $1,000–$10,000 per SKU is more typical. Often called a new item fee rather than slotting. Frequently waived for proven performers.
• Smaller regional chains: Often no formal slotting, but expect a discounted first PO instead.
• Costco and Sam's Club: Typically no slotting, but membership warehouses extract their cost via aggressive cost-plus pricing.

The mistake founders make is treating slotting as a sunk cost. It isn't. It's amortized against your expected first-year units. A $20,000 slotting fee on a SKU that sells 80,000 units the first year is $0.25 per unit — meaningful but workable. The same $20,000 on a SKU that sells 12,000 units is a $1.67/unit drag, and that's a SKU that's about to get cut at the next reset.

The other thing slotting buys you is the right to be in the item master. If you ever want to launch a second SKU into the same retailer, you've already paid the relationship cost, and the next slotting conversation is materially easier.

Free fill and the first-PO problem

Free fill is the retailer's request that your first PO — the one that fills every DC and every store — be discounted, sometimes to 50% off wholesale, sometimes to free. The math behind it is the retailer's: they're absorbing the working-capital cost of standing up a brand-new SKU across their network, and they want you to share that cost.

Realistic numbers for an automotive program at a Walmart-scale account:

• 4,200 stores × 12-unit case pack × 2 weeks of safety stock = ~100,800 unit store seed
• Plus DC seed: 8 DCs × 4 weeks × ~38,500 unit weekly draw = ~1.2M units
• Total first PO: ~1.3M units

If you offer 25% free fill on that PO at $5.50 wholesale, you've just absorbed roughly $1.79M in margin in a single concession. You have to factor this. It is rare to win a national program at a major retailer without some form of free-fill negotiation, and a flat refusal is almost never the right play — but the right number is.

The negotiation play is to trade free fill against MOQ commitment, a longer initial program (12 months vs. 6), or a guarantee against the first 90-day sell-through. Free fill on its own is a one-way concession.

MDF and TPR: the funded-promotion math

MDF — Market Development Funds — is a percent of net sales, typically 2–6% in automotive aftermarket, that the retailer keeps as a credit against your invoice and uses for category-level marketing, promotion, end-cap funding, and POS support. Some MDF is highly directed (you're funding a specific end-cap event); some is general (the retailer deploys it across the category as she sees fit).

TPR — Temporary Price Reduction — co-pay is different. When the retailer drops your SKU's retail price for a four-week sale, they expect you to fund some or all of the gross margin they give up. Standard ask in 2026: a 50% co-pay on the retail-price reduction during TPR weeks.

Run the math on a typical wiper program:

• Wholesale: $7.00, retail: $13.99, GM rate: 50%
• Annual units at base price: 600,000
• TPR program: 4 events × 4 weeks each = 16 weeks at $11.99 retail
• Lift during TPR weeks: +35%, so units in those 16 weeks = ~285,000
• Retailer margin give-up at TPR retail: $1.00/unit × 285,000 = $285,000
• 50% co-pay = $142,500/year

Add 4% MDF on the program ($7 × 600,000 × 4% = $168,000) and you're at $310,500 of funded promotion before you've shipped a unit beyond the first PO. That's a real number that has to live in your model.

Building these costs into your program from day one

The vendors who survive their second line review are the ones who model all four buckets in the original program proposal. Three rules that work:

1. Bake an effective wholesale price into your math, not the headline wholesale price. If your headline is $7.00 and your loaded wholesale — after slotting amortization, free fill, MDF, and TPR — is $5.85, the retailer is effectively buying at $5.85. Plan to that number, not the headline.
2. Negotiate every bucket separately, never as a lump. Retailers package these into all-in asks at the end of the meeting. Force them out into line items and you'll find some are flexible (slotting, free fill) and some are policy (MDF percentage). Trade across buckets, not within them.
3. Make every concession contingent on a commitment. Free fill in exchange for a 12-month program. Slotting waiver in exchange for an exclusive in your sub-category. TPR co-pay in exchange for guaranteed end-cap weeks. Every dollar you give up should buy something specific.

What this means for your next line review

The line review is the negotiation. Anything you didn't model going in, you'll fund coming out. The vendors who win at retail aren't the ones with the lowest wholesale price — they're the ones who walked in with all four buckets pre-funded in their margin stack and a clear position on every concession the buyer might ask for.

Slotting is amortized. Free fill is traded. MDF is policy. TPR is co-paid. Build the model first. Then build the SKU.