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Inventory Policies & Rules

Inventory policies are the automated rules that keep your inventory healthy without constant manual intervention. This section teaches you how to set them up and use them effectively.

What You'll Learn​

This section covers the automated decision rules that govern your inventory:

  1. Policy Fundamentals — What policies are and why they matter
  2. ABC Rules & Prioritization — Treat products differently by importance
  3. Reorder Points & Safety Stock — When and how much to order
  4. Min-Max Inventory Levels — Keep inventory in the healthy zone
  5. Location-Based Policies — Different rules per warehouse

Why Policies Matter​

Smart inventory policies help you:

✅ Reduce manual work — Automation flags what needs attention
✅ Prevent stockouts — Safety stock buffers catch demand spikes
✅ Reduce overstock — Max levels prevent excess
✅ Optimize capital — Right amount invested in inventory
✅ Fair allocation — Grade A products get priority
✅ Consistency — Same rules applied everywhere
✅ Flexibility — Different rules for different locations

The Policy Hierarchy​

Company-Wide Defaults
    ↓
├─ By Product Grade (A/B/C)
│  ├─ Grade A: High safety stock, frequent checks
│  ├─ Grade B: Medium safety stock, standard checks
│  └─ Grade C: Low safety stock, less frequent
│
├─ By Product Type (Seasonal/Volatile/Stable)
│  ├─ Seasonal: Adjust seasonally
│  ├─ Volatile: Higher buffers
│  └─ Stable: Minimal buffers
│
└─ By Location (Warehouse/Retail)
   ├─ Warehouse: Higher volumes, consolidation
   ├─ Retail A: Medium volumes, split orders
   └─ Retail B: Lower volumes, less frequent orders

Four Key Policy Types​

1. Reorder Point Policy​

What: Automatically trigger when to place orders

Formula: (Lead Time × Average Daily Sales) + Safety Stock

Example:

Lead time: 30 days
Average daily sales: 10 units
Safety stock: 50 units
Reorder point: (30 × 10) + 50 = 350 units

Action: When inventory drops to 350, order more

2. Reorder Quantity Policy​

What: How much to order each time

Methods:

  • Fixed quantity (e.g., always order 500 units)
  • Optimal order quantity (balances holding vs. ordering costs)
  • Cover X weeks (e.g., order enough for 6 weeks)

Example:

Method: Cover 6 weeks of sales
Average weekly sales: 70 units
Reorder quantity: 70 × 6 = 420 units

Action: When you reorder, buy 420 units

3. Safety Stock Policy​

What: Minimum buffer to protect against demand spikes

By Grade:

  • Grade A: 15-20 days of inventory
  • Grade B: 8-12 days of inventory
  • Grade C: 3-5 days of inventory

Example:

Grade B product
Average daily sales: 15 units
Safety stock days: 10 days
Safety stock quantity: 15 × 10 = 150 units

Minimum inventory to maintain: 150 units

4. Min-Max Policy​

What: Keep inventory between minimum and maximum levels

Formula:

  • Minimum = Reorder Point
  • Maximum = Reorder Point + Reorder Quantity

Example:

Minimum (reorder point): 350 units
Reorder quantity: 420 units
Maximum: 350 + 420 = 770 units

Action: Keep between 350-770 units

Real-World Policy Example​

Company: Multi-location apparel store
Product: Blue T-Shirt (Grade B - core product)

Policy Settings​

Reorder Point Calculation:
├─ Lead time: 30 days
├─ Average daily sales: 8 units
├─ Safety stock: 80 units (10 days × 8)
└─ REORDER POINT: (30 × 8) + 80 = 320 units

Reorder Quantity:
├─ Method: Cover 6 weeks
├─ Weekly sales: 56 units (8 × 7)
├─ Weeks to cover: 6
└─ REORDER QUANTITY: 56 × 6 = 336 units

Min-Max Levels:
├─ Minimum: 320 units
├─ Maximum: 320 + 336 = 656 units
└─ Keep between 320-656 units

Safety Stock Monitoring:
├─ Days of stock at minimum: 40 days (320 ÷ 8)
├─ Days of stock at maximum: 82 days (656 ÷ 8)
└─ Healthy range maintained

How It Works Monthly​

December 1: Inventory = 450 units (healthy, in range)
├─ Status: Normal, monitor

December 10: Inventory = 380 units (still above reorder point)
├─ Status: Normal, monitor

December 15: Inventory = 320 units (hits reorder point!)
├─ Action: REORDER 336 units
├─ Order date: December 15
├─ Expected arrival: January 14
├─ Status: Order created

December 20: Inventory = 300 units (used some while waiting)
├─ Status: Below reorder point (expected during lead time)
├─ Monitor daily

January 14: Inventory = 250 units
├─ Action: Incoming order arrives (+336 units)
├─ New inventory: 586 units
├─ Status: Back in healthy range

January 15: Inventory = 586 units (in range)
├─ Status: Normal, monitor
└─ Cycle repeats

Policy by Grade (A/B/C)​

Grade A Products (High Priority)​

Characteristics: High revenue, important to sell

Policies:

  • Reorder point: Higher (more safety stock)
  • Reorder frequency: More often (weekly checks)
  • Safety stock days: 12-15 days
  • Service level: 95%+ (rarely stockout)

Example:

Top winter jacket (50% of revenue)
Reorder point: 500 units
Safety stock: 120 units (15 days)
Checked: Every week
Allowed stockouts per year: <5 days

Grade B Products (Medium Priority)​

Characteristics: Core products, steady sellers

Policies:

  • Reorder point: Medium (standard safety stock)
  • Reorder frequency: Bi-weekly (every 2 weeks)
  • Safety stock days: 8-10 days
  • Service level: 90%+ (occasional stockout OK)

Example:

Blue T-Shirt (20% of revenue)
Reorder point: 320 units
Safety stock: 80 units (10 days)
Checked: Every 2 weeks
Allowed stockouts per year: 10-15 days

Grade C Products (Low Priority)​

Characteristics: Slow movers, impulse buys

Policies:

  • Reorder point: Lower (minimal safety stock)
  • Reorder frequency: Monthly (once per month)
  • Safety stock days: 3-5 days
  • Service level: 80%+ (stockouts acceptable)

Example:

Niche specialty item (2% of revenue)
Reorder point: 80 units
Safety stock: 20 units (3 days)
Checked: Once per month
Allowed stockouts per year: 30-60 days

Day 1: Foundations (75 minutes)​

  1. Policy Fundamentals — Concepts (15 min)
  2. ABC Rules & Prioritization — Grading by importance (20 min)
  3. Reorder Points & Safety Stock — When to order (20 min)
  4. Min-Max Inventory Levels — How much to keep (20 min)

Day 2: Implementation (60 minutes)​

  1. Location-Based Policies — Multi-location rules (20 min)
  2. Real-world application examples (20 min)

Next Steps​

Ready to set up policies?

Questions?​

Each guide has:

  • Step-by-step setup instructions
  • Real examples with numbers
  • Common mistakes & fixes
  • FAQ sections

Need help? → Contact support@synplex.io