diff --git a/services/targo-hub/lib/legacy-reports.js b/services/targo-hub/lib/legacy-reports.js
index 179dc26..590d944 100644
--- a/services/targo-hub/lib/legacy-reports.js
+++ b/services/targo-hub/lib/legacy-reports.js
@@ -22,15 +22,26 @@
  *
  *   Effective monthly price of a service line:
  *     base   = service.hijack=1 ? service.hijack_price : product.price
- *     // Annual plans (SKU ends in "ANN", e.g. FTTH_ANN @ 480$/yr) are
- *     // normalized to a monthly equivalent so the threshold compares apples
- *     // to apples — otherwise a $480/yr (=$40/mo) plan falsely shows as $480.
+ *     // product.price is ALREADY the monthly unit price regardless of the
+ *     // service's billing frequency — a semestrial FTTH1500I has price
+ *     // 109.95 (same as the monthly one) and is billed 6×109.95 every 6
+ *     // months. Verified against the legacy billing logic (LEGACY-
+ *     // ACCOUNTING-ANALYSIS.md §6.1: "prix = quantité × prix_unitaire").
+ *     // So we do NOT divide by service.payment_recurrence.
+ *     // The one exception: true annual plans (SKU ends in "ANN", e.g.
+ *     // FTTH_ANN @ 480$/yr where price IS the yearly amount) → normalize /12.
  *     monthly = base / (sku LIKE '%ANN' ? 12 : 1)
  *
  *   Only recurring lines count: product.price_recurr_type = 1. Type 0 is
  *   one-time charges (equipment, installation) which don't belong on a
  *   recurring monthly bill.
  *
+ *   Expired credits excluded: a discount line (price<0) whose service
+ *   actif_until is in the past no longer reduces the real bill — counting
+ *   it would understate what the client actually pays today. (Per
+ *   LEGACY-ACCOUNTING-ANALYSIS.md §10: promo credits carry an actif_until
+ *   end date.)
+ *
  *   Internet product categories:
  *     32 Mensualités fibre, 4 Mensualités sans-fil, 23 Internet camping
  *     (add-ons) 16 Téléch. supp, 17 IP fixe, 21 Location point-à-point
@@ -106,6 +117,7 @@ function buildQuery (url) {
     JOIN product  p ON p.id = s.product_id
     WHERE p.category IN (${catPlaceholders})
       AND p.price_recurr_type = 1
+      AND NOT (p.price < 0 AND s.actif_until IS NOT NULL AND s.actif_until > 0 AND s.actif_until < UNIX_TIMESTAMP())
       ${commercialClause}
     GROUP BY d.id
     HAVING net_internet > ?