In the context of the Nairobi Coffee Exchange (NCE) and Kenyan coffee trade, the Total Contribution refers to the final financial breakdown of a Lot after all deductions have been made from the gross auction price.
Because you are targeting premium grades (AA/AB) and high density, your “Total Contribution” is where you see the financial reward for your husbandry.

  1. The Calculation Flow
    The “Total Contribution” is essentially the Net Pay to the grower (or the Cooperative Society). It follows this standard formula:
    A. Gross Auction Price
    This is the “Hammer Price” at the auction (e.g., $420 per 50kg bag).
  • Grade Bonus: In 2026, Grade AA lots from quality factories (like Gachatha or Gititu) have been hitting premiums of up to $500, significantly boosting the gross contribution.
    B. Mandatory Deductions (Statutory)
    Before you see the money, the government and the exchange take their share:
  • Ad Valorem Levy (2%): A percentage of the gross value paid to the Coffee Directorate.
  • Auction Levy (0.2% – 0.3%): Paid to the Nairobi Coffee Exchange for hosting the trade.
  • County Cess (1%): A local tax for infrastructure development in the coffee-growing region.
  1. Operational Deductions (The “Cost” of Quality)

    These are the costs incurred to get your coffee to that high physical standard you saved (Screen 17/18 and 11.5% moisture).
    Cost Item Typical Rate (Approx.) Impact on your Lot
    Milling Charges $40 – $60 per Tonne Hulling parchment into clean beans.
    Brokerage Commission 1% – 1.5% The fee for the marketing agent/broker.
    Warehousing Per bag/week Storage while waiting for the auction date.
    Color Sorting Variable Optional: Essential for hitting your “Zero Defect” density goals. The “Out-turn” Contribution Ratio
    A critical part of your contribution is the Milling Out-turn.
    • The 6.5 Rule: Historically, it takes about 6.5kg of Cherry to produce 1kg of Clean Coffee.
    • Your Advantage: Because you are targeting a high Density (820–850 g/L), your out-turn ratio may improve (e.g., 6.0:1). This means more of your harvest contributes to the high-value “Main Grades” (AA/AB) and less ends up in the low-value “Lights” or “T” grades.
    1. The Direct Settlement System (DSS)
      In 2026, the Total Contribution is managed via the Direct Settlement System (DSS).
    • Transparency: You receive a statement showing exactly what the buyer paid and every cent deducted.
    • Speed: Once the “Prompt Date” (usually 5 working days post-auction) is reached, the net contribution is wired directly to the factory or estate account.
      Why your 22° BRIX matters here:
      Higher sugar content and density usually correlate with higher cup scores. In the auction, a cup score of 87+ can trigger a “Quality Premium” from specialty buyers, which can increase your Total Contribution by 20–50% above the market average.

Here is a mock Out-turn Statement for a high-quality delivery. In 2026, these are processed through the Direct Settlement System (DSS), ensuring you see the “Total Contribution” clearly.
This example assumes a delivery of 10,000kg of Cherry with the high-density and ripening parameters you are targeting.
Mock Coffee Out-turn Statement (2026)
Grower ID: Estate/Factory #4021 | Out-turn No: 26-MIL-0452
Date: February 24, 2026

  1. Milling & Grading Results
    Grade % of Total Weight (Clean Coffee) Price/50kg (USD) Gross Value (USD)
    AA (Screen 17/18) 45% 720 kg (12 bags) $480.00 $6,912.00
    AB (Screen 15/16) 35% 560 kg (9.3 bags) $420.00 $4,746.00
    PB (Peaberry) 10% 160 kg (2.6 bags) $400.00 $1,040.00
    C / Undergrade 10% 160 kg (2.6 bags) $250.00 $650.00
    TOTAL 100% 1,600 kg Avg: $416 $13,348.00 Husbandry Impact: Because you targeted a density of 820–850 g/L, your AA/AB percentage is a high 80%. Poorly managed farms often see this drop to 50%, with the rest falling into low-value “Lights.”
    1. Mandatory Statutory Deductions
      Description Rate Amount (USD)
      Ad Valorem Levy 2.0% $266.96
      County Cess 1.0% $133.48
      NCE Auction Levy 0.3% $40.04
      Total Statutory $440.48 Operational Costs (Service Providers)
      Description Rate Amount (USD)
      — — —
      Milling Fees $50 / Tonne Clean $80.00
      Brokerage Fee 1.5% $200.22
      Warehousing/Handling Flat rate $45.00
      DSS Transaction Fee Standard $12.00
      Total Operational $337.22 Final Contribution Summary
      • Gross Auction Value: $13,348.00
      • Total Deductions (Statutory + Operational): ($777.70)
      • TOTAL CONTRIBUTION (Net Pay): $12,570.30
        What this means for your Harvest
        In 2026, the Direct Settlement System triggers this payment to your bank within 2–5 days of the buyer paying the NCE.
        By hitting your initial BRIX of 22°, you are essentially “packing” more weight into every cherry. If your density was lower (say 780 g/L), you would have needed nearly 11,500kg of cherry to get that same $12,500 check. Your focus on husbandry is literally increasing your “pay per kilo.”