diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index 12b1e7d..d081e03 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -7160,7 +7160,7 @@ impl Strategy for PlatformExprStrategy {
                 slot_working_symbols.remove(symbol);
             }
 
-            if !self.config.aiquant_transaction_cost || !same_day_sold_symbols.is_empty() {
+            if !self.config.aiquant_transaction_cost {
                 aiquant_available_cash = projected.cash();
             }
             let fixed_buy_cash = aiquant_total_value * trading_ratio / selection_limit as f64;
@@ -16736,6 +16736,7 @@ mod tests {
         cfg.stop_loss_expr.clear();
         cfg.daily_top_up_enabled = true;
         cfg.intraday_execution_time = Some(NaiveTime::from_hms_opt(9, 33, 0).unwrap());
+        let base_cfg = cfg.clone();
         let mut strategy = PlatformExprStrategy::new(cfg);
         strategy.rebalance_day_counter = 20;
 
@@ -16772,6 +16773,51 @@ mod tests {
             "{:?}",
             decision.order_intents
         );
+
+        let mut aiquant_portfolio = PortfolioState::new(4_000.0);
+        aiquant_portfolio
+            .position_mut("000003.SZ")
+            .buy(prev_date, 1_000, 10.0);
+        let aiquant_ctx = StrategyContext {
+            execution_date: date,
+            decision_date: date,
+            decision_index: 20,
+            data: &data,
+            portfolio: &aiquant_portfolio,
+            futures_account: None,
+            open_orders: &[],
+            dynamic_universe: None,
+            subscriptions: &subscriptions,
+            process_events: &[],
+            active_process_event: None,
+            active_datetime: None,
+            order_events: &[],
+            fills: &[],
+        };
+        let mut aiquant_cfg = base_cfg;
+        aiquant_cfg.aiquant_transaction_cost = true;
+        let mut aiquant_strategy = PlatformExprStrategy::new(aiquant_cfg);
+        aiquant_strategy.rebalance_day_counter = 20;
+
+        let aiquant_decision = aiquant_strategy
+            .on_day(&aiquant_ctx)
+            .expect("aiquant platform decision");
+        let aiquant_periodic_buys = aiquant_decision
+            .order_intents
+            .iter()
+            .filter(|intent| {
+                matches!(
+                    intent,
+                    OrderIntent::Value { reason, .. } if reason == "periodic_rebalance_buy"
+                )
+            })
+            .count();
+
+        assert_eq!(
+            aiquant_periodic_buys, 1,
+            "{:?}",
+            aiquant_decision.order_intents
+        );
     }
 
     #[test]