Merchandise Planner Job Description

The merchandise planner is the financial architect of a fashion department. Working as the buyer's commercial partner, the planner decides how much the department should sell, at what margin, with how much stock, and therefore how much money the buyer may spend — the open-to-buy — before a single garment is ordered. Through the season the planner watches the plan meet reality and leads the response: reforecasting sales, moving money between categories, calling for markdowns or reorders while they can still change the outcome. It is the central planning role from which this whole category takes its shape.

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Building the Plan: Sales, Margin, Stock and Open-to-Buy

A plan is built before the season, at department and category level, in sales value, margin and units. The planner starts from history — last year's sales by month and category, the margin achieved, the stock carried and what it cost in markdown to clear — then adjusts for everything the business intends: new stores or channels, categories being grown or exited, price moves, and the market direction the trend analysis supports. The result is a month-by-month framework: planned sales, planned receipts of new stock, planned markdown, and the closing stock the department may hold at each point without starving trade or drowning in inventory.

Open-to-buy is the plan converted into spending authority. It tells the buyer, at any moment, how much money remains uncommitted for future delivery months after orders already placed are counted. Managing it is a balancing act the planner owns: hold too much back and the season's best opportunities cannot be chased; commit too early and there is nothing left when an unexpected winner appears or a category suddenly accelerates. The planner also frames the range plan in numbers — how many options, at what average price, in what depth — so the buyer's creative choices assemble into a range the stock budget can actually carry.

Planning the Range with the Buyer

Planning and buying are a partnership, and the planner's half is evidence. In range reviews the planner brings the category's story in numbers: which sub-categories and price points earned their space last season, where breadth outran depth and produced broken sizes, which styles sold at full price and which only moved on promotion. The buyer brings product knowledge and market instinct. Together they shape a range that is both commercial and coherent, and the planner then translates the agreed range into order quantities, delivery phasing and store allocations budgets, checking the total against the plan one final time before orders are committed.

Delivery phasing is an under-sung part of the craft. A season's stock arriving in one early drop ties up cash, ages on the rail and forces early markdown; the same stock phased across the season keeps the offer fresh and the stockturn healthy. The planner therefore plans intake by month and defends that phasing against the pressures of factory minimums and freight economics, which always argue for fewer, bigger shipments. Where a business sells through its own stores and online, the planner also splits the plan by channel, because the two trade on different rhythms and stock cannot simply be shared without rules.

In Season: Reforecasting and Trading the Plan

Once trading begins, the plan becomes a forecast to be corrected. The planner reforecasts sales and stock weekly or monthly from actual performance — a cold spring, a competitor's collapse, a viral style — and the reforecast drives the season's real decisions. Money moves from categories missing their numbers to categories beating them. Winners are identified early enough to reorder within the season where lead times allow. Losers are marked down deliberately, at the depth and moment the planner calculates will clear them for the least margin damage, rather than in a late panic that destroys the season's result and trains customers to wait for sales.

The season closes with the review that starts the next plan: what the department planned, what happened, and why — price, depth, phasing, trend calls and range shape each examined honestly. Planners who run this discipline tightly are the reason some fashion businesses end seasons with clean stock and margin intact while competitors with similar ranges do not. The difference the role makes is rarely visible in any single decision; it is the compound interest of hundreds of small financial corrections made early.

Skills, Qualifications and Career Path

Retail math is the planner's language: sales, margin, markdown, stockturn, weeks of cover and return on inventory investment, handled fluently in spreadsheets and planning systems and explained clearly to non-numerical partners. Commercial judgment sits on the arithmetic — the planner must know when the data argues for backing a buyer's instinct and when it argues for restraint — and communication skill decides whether that judgment lands, because the planner's most important conversations are often the ones where the numbers say no, or not yet, or less.

Planners usually enter as planning or merchandising assistants, allocators or assistant buyers with strong numerical records, and degrees in fashion merchandising, business, finance or numerate subjects are common. Employers train planners on their planning systems and seasonal calendar; what they screen for is spreadsheet strength, accuracy and a feel for how ranges make money. Progression runs to senior planner and planning manager, owning whole divisions and the planners within them, with sideways routes into the combined planning and allocation functions and toward buying leadership for planners who add product flair to the numbers.