Repair Shop Parts Inventory: 30% Tied Up Capital (Accelerate Turnover)
- Why Repair Shops Overstock
- The Inventory Math
- Just-In-Time Parts Supply
- AskBiz Parts Turnover Tracking
- The Repair Shop's Real Trade-Off: Stockout Cost vs Carrying Cost
- Building Supplier Relationships That Actually Support Just-In-Time Ordering
- Turning Slow-Moving Parts Into Recovered Cash Instead of Dead Stock
Mobile phone repair shop SGD 200K annual revenue. Parts inventory: SGD 50K (6 months of stock). Turnover: 4x/year (sell through entire inventory every 3 months). Working capital: SGD 50K tied up = 25% of annual revenue. Cost of capital: 4% = SGD 2K/year. Optimization: reduce to 90-day stock (SGD 30K) via just-in-time + supplier reliability = free SGD 20K + save SGD 800/year interest.
- Why Repair Shops Overstock
- The Inventory Math
- Just-In-Time Parts Supply
- AskBiz Parts Turnover Tracking
- The Repair Shop's Real Trade-Off: Stockout Cost vs Carrying Cost
Why Repair Shops Overstock#
Parts are cheap individually (SGD 10-500). But variety is huge (100+ part SKUs for phone repair). Most shops stock "just in case" = overstocking by 50-100%. Result: SGD 50K tied up, slow turnover (4x/year), obsolescence risk (parts become irrelevant as devices change).
The Inventory Math#
Repair shop SGD 200K annual revenue, 40% COGS (parts + labor) = SGD 80K parts cost. Stock SGD 50K = 7.5 months of parts on hand. Turnover: 4x/year (sell through 1/4 of inventory per quarter). Better: turnover 6-8x/year (2-month stock = SGD 13K-20K). Free capital: SGD 30K-40K.
Just-In-Time Parts Supply#
(1) Supplier partnerships: identify top 5-10 part suppliers. (2) Weekly orders: order exactly what you need (short-lead-time parts). (3) Safety stock: only high-volume parts (chargers, screens). (4) Obsolescence management: depreciate slow-moving parts every quarter.
AskBiz Parts Turnover Tracking#
Tracks turnover per part. "Chargers: 24x/year turnover (0.4 months stock = SGD 200). Screen replacements: 12x/year (1 month stock = SGD 1K). Camera modules: 2x/year (6 months stock = SGD 5K, slow mover). Recommendation: reduce camera module stock to 3 months (if supplier reliable), free SGD 2.5K. At 4% cost of capital, save SGD 100/year."
The Repair Shop's Real Trade-Off: Stockout Cost vs Carrying Cost#
Reducing parts inventory too aggressively creates a different, often more expensive problem than overstocking: a customer walks in with a broken screen, you don't have the part in stock, and they walk straight to a competitor down the row who does. A phone and laptop repair shop in a busy electronics mall cut their screen inventory too sharply after reading generic inventory optimisation advice, aiming purely for faster turnover without weighing the cost of a stockout against the modest carrying cost of holding an extra unit. Within six weeks, the shop tracked eleven walk-in customers who left without a repair because a common screen model wasn't in stock — and given that mall's dense cluster of competing repair kiosks, every one of those customers almost certainly completed their repair at a competitor within the same building, a total loss of the transaction plus the lost opportunity for a repeat customer relationship. The shop recalibrated by keeping their genuinely high-turnover items (the top 15–20 SKUs covering the most common phone models in the local market) at a slightly higher safety stock than pure turnover math would suggest, while applying aggressive just-in-time ordering only to lower-volume, less commonly requested parts. The right inventory target isn't a single turnover number applied uniformly — it's a stockout-cost-weighted target that varies by how walkable the competition is and how price-sensitive customers are to waiting even a single day for a part.
Building Supplier Relationships That Actually Support Just-In-Time Ordering#
Just-in-time parts ordering only works if the supply chain behind it is genuinely reliable — and many repair shops that attempt to cut inventory learn the hard way that their existing supplier relationships weren't built for that kind of responsiveness. A watch and small electronics repair business switched to a lean, weekly-order parts model, expecting their existing parts distributor to keep pace, only to discover that distributor's own stock levels were unpredictable, occasionally leaving the repair shop without a part for a week or more when the distributor themselves ran short. After several frustrating stockouts that directly cost completed jobs, the shop deliberately cultivated a second, smaller backup supplier specifically for their highest-volume parts categories — accepting a marginally higher unit cost from the backup supplier in exchange for genuine reliability as a fallback whenever the primary distributor was out of stock. This dual-sourcing approach cost slightly more on a small share of orders but effectively eliminated stockout-driven lost jobs, illustrating that just-in-time inventory strategy is inseparable from supplier reliability — cutting stock levels without first confirming your suppliers can genuinely support faster replenishment cycles just relocates the risk rather than eliminating it.
Turning Slow-Moving Parts Into Recovered Cash Instead of Dead Stock#
Every repair shop accumulates a tail of genuinely obsolete parts — components for discontinued device models nobody brings in for repair anymore — and the default response of simply letting them sit in a drawer indefinitely is a quiet, ongoing waste of both shelf space and tied-up capital that was never going to be recovered through normal sales. A multi-brand electronics repair shop conducting their first full parts audit in three years found nearly SGD 6,000 worth of components for phone models that had been out of production for years, parts that had zero realistic chance of selling through the normal repair workflow. Rather than writing the full amount off as a total loss, the owner listed the batch on a specialist parts resale marketplace used by other repair shops and hobbyist repairers, recovering roughly 35% of the original cost — not a great outcome, but meaningfully better than the zero recovery of leaving them on a shelf indefinitely or the cost of simply disposing of them. Building a standing quarterly review specifically for parts with zero movement in six-plus months, with a default action (resell, return to supplier if possible, or write off) rather than an indefinite default of doing nothing, converts what is otherwise a permanent drag on working capital into at least a partial cash recovery.
People also ask
What inventory turnover is healthy for repair?
Best: 8-12x/year (monthly stock). Good: 6-8x/year. Average: 4-6x/year. Poor: <4x/year.
How do I manage obsolescence?
Quarterly review: depreciate parts not sold in 6 months by 50%. If still not sold in 12 months: write off (loss). Reduces tied-up capital.
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