diff --git a/src/components/booking/BookingDialog.tsx b/src/components/booking/BookingDialog.tsx
index bbee39c..effc496 100644
--- a/src/components/booking/BookingDialog.tsx
+++ b/src/components/booking/BookingDialog.tsx
@@ -60,7 +60,8 @@ export function BookingDialog({
 
   const [step, setStep] = useState(0);
   const [participant, setParticipant] = useState<Participant>(EMPTY);
-  const [chosenPlan, setPlanType] = useState<PlanType>("FULL");
+  // Keine Vorauswahl: Preise erscheinen erst unter der gewaehlten Zahlungsweise.
+  const [chosenPlan, setPlanType] = useState<PlanType | null>(null);
   const [voucherInput, setVoucherInput] = useState("");
   const [appliedVoucher, setAppliedVoucher] = useState<string | null>(null);
   const [voucherMessage, setVoucherMessage] = useState<string | null>(null);
@@ -114,11 +115,11 @@ export function BookingDialog({
     };
   }, [open, quote]);
 
-  // Eine nicht (mehr) verfuegbare Ratenvariante faellt auf Einmalzahlung zurueck.
+  // Eine nicht (mehr) verfuegbare Variante gilt als nicht gewaehlt.
   const chosen = quote?.plans.find((p) => p.type === chosenPlan);
-  const planType: PlanType = chosen && !chosen.available ? "FULL" : chosenPlan;
+  const planType: PlanType | null = chosen?.available ? chosenPlan : null;
 
-  const selectedPlan = quote?.plans.find((p) => p.type === planType) ?? null;
+  const selectedPlan = chosen?.available ? chosen : null;
 
   function updateParticipant(field: keyof Participant, value: string) {
     setParticipant((prev) => ({ ...prev, [field]: value }));
@@ -174,6 +175,7 @@ export function BookingDialog({
 
   async function submit() {
     setFormError(null);
+    if (!planType) return;
     const missing: FieldErrors = {};
     if (!consents.adult) missing["consents.adult"] = "Bitte bestätige, dass du volljährig bist.";
     if (!consents.terms) missing["consents.terms"] = "Bitte akzeptiere die Buchungsbedingungen.";
@@ -324,32 +326,29 @@ export function BookingDialog({
                       <legend className="field-label">Wie möchtest du bezahlen?</legend>
                       <div className="mt-2 space-y-3">
                         {quote?.plans.map((plan) => (
-                          <label
+                          <div
                             key={plan.type}
-                            className={`flex cursor-pointer gap-4 rounded-xl border p-4 ${planType === plan.type ? "border-ink bg-paper" : "border-line"} ${plan.available ? "" : "cursor-not-allowed opacity-60"}`}
+                            className={`rounded-xl border p-4 ${planType === plan.type ? "border-ink bg-paper" : "border-line"} ${plan.available ? "" : "opacity-60"}`}
                           >
-                            <input
-                              type="radio"
-                              name="planType"
-                              value={plan.type}
-                              checked={planType === plan.type}
-                              disabled={!plan.available}
-                              onChange={() => {
-                                setPlanType(plan.type);
-                              }}
-                              className="mt-1 h-5 w-5 accent-[var(--color-rosso)]"
-                            />
-                            <span className="flex-1">
-                              <span className="block font-semibold">{plan.label}</span>
-                              {plan.available ? (
-                                <span className="mt-1 block text-[0.9375rem] text-ink/80">
-                                  {plan.installments.map((i) => money(i.amountCents)).join(" + ")}
-                                </span>
-                              ) : (
-                                <span className="mt-1 block text-[0.9375rem] text-stone">{plan.reason}</span>
-                              )}
-                            </span>
-                          </label>
+                            <label className={`flex gap-4 ${plan.available ? "cursor-pointer" : "cursor-not-allowed"}`}>
+                              <input
+                                type="radio"
+                                name="planType"
+                                value={plan.type}
+                                checked={planType === plan.type}
+                                disabled={!plan.available}
+                                onChange={() => {
+                                  setPlanType(plan.type);
+                                }}
+                                className="mt-1 h-5 w-5 accent-[var(--color-rosso)]"
+                              />
+                              <span className="flex-1">
+                                <span className="block font-semibold">{plan.label}</span>
+                                {!plan.available && <span className="mt-1 block text-[0.9375rem] text-stone">{plan.reason}</span>}
+                              </span>
+                            </label>
+                            {plan.available && planType === plan.type && quote.price && <PlanDetails plan={plan} quote={quote} />}
+                          </div>
                         )) ?? <p className="text-stone">Preise werden geladen …</p>}
                       </div>
                     </fieldset>
@@ -384,8 +383,6 @@ export function BookingDialog({
                         {voucherMessage}
                       </p>
                     </div>
-
-                    {quote?.price && <PriceBreakdown quote={quote} />}
                   </div>
                 )}
 
@@ -462,7 +459,7 @@ export function BookingDialog({
                         </a>{" "}
                         gelesen.
                       </Consent>
-                      {planType !== "FULL" && (
+                      {planType !== null && planType !== "FULL" && (
                         <Consent
                           id="installmentMandate"
                           checked={consents.installmentMandate}
@@ -494,7 +491,7 @@ export function BookingDialog({
               <span />
             )}
             {step < STEPS.length - 1 ? (
-              <button type="button" className="btn btn-primary" onClick={next} disabled={step === 1 && !quote?.price}>
+              <button type="button" className="btn btn-primary" onClick={next} disabled={step === 1 && (!quote?.price || !selectedPlan)}>
                 Weiter
               </button>
             ) : (
@@ -509,6 +506,27 @@ export function BookingDialog({
   );
 }
 
+/** Preis und Raten unter der gewaehlten Zahlungsweise. */
+function PlanDetails({ plan, quote }: { plan: QuoteData["plans"][number]; quote: QuoteData }) {
+  return (
+    <div className="mt-3 pl-9">
+      <PriceBreakdown quote={quote} />
+      {plan.installments.length > 1 && (
+        <ul className="mt-3 space-y-1 text-[0.9375rem] text-ink/80">
+          {plan.installments.map((i) => (
+            <li key={i.seq} className="flex justify-between gap-4">
+              <span>
+                Rate {i.seq}, {i.dueDate ? `fällig ${isoDate(i.dueDate)}` : "heute"}
+              </span>
+              <span className="tabular-nums">{money(i.amountCents)}</span>
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+}
+
 function PriceBreakdown({ quote }: { quote: QuoteData }) {
   const p = quote.price!;
   return (