diff --git a/app/config.yml b/app/config.yml
index 3b91aff..38e6132 100644
--- a/app/config.yml
+++ b/app/config.yml
@@ -112,6 +112,7 @@ charge-to:
     phone: "+1-212-555-0100"
     email: accounts@acmecorp.example
     vat-id: "US-EIN-12-3456789"
+    reg-no: ""
     currency: USD
   - display: Example NGO
     name: Example Non-Profit Organisation
@@ -123,6 +124,7 @@ charge-to:
     phone: "+44 20 7123 4567"
     email: finance@examplengo.example
     vat-id: "GB123456789"
+    reg-no: "01234567"
     currency: GBP
 
 # ── Project codes ──────────────────────────────────────────────────────────────
@@ -288,6 +290,11 @@ translations:
     de: USt-IdNr.
     fr: "N° TVA / ID fiscal"
     "no": MVA-nummer
+  registration-no:
+    en: "Registration no."
+    de: "Handelsreg.-Nr."
+    fr: "N° d'enregistrement"
+    "no": "Organisasjonsnr."
   invoice-date:
     en: Invoice date
     de: Rechnungsdatum
diff --git a/app/index.html b/app/index.html
index e691181..cac1a29 100644
--- a/app/index.html
+++ b/app/index.html
@@ -516,29 +516,27 @@ function buildForm() {
         <option value="__other__">${t("other")}</option>
       </select>
     </div>
-    <div id="ct-fields" class="two-col">
-      <div>
-        <div class="fg"><label id="lbl-ctn" for="ctn">${t("charge-to-name")}</label>
-          <input id="ctn" type="text"></div>
-        <div class="fg"><label id="lbl-ca1" for="ca1">${t("charge-to-address1")}</label>
-          <input id="ca1" type="text"></div>
-        <div class="fg"><label id="lbl-ca2" for="ca2">${t("charge-to-address2")}</label>
-          <input id="ca2" type="text"></div>
-        <div class="fg"><label id="lbl-ca3" for="ca3">${t("charge-to-address3")}</label>
-          <input id="ca3" type="text"></div>
-        <div class="fg"><label id="lbl-ca4" for="ca4">${t("charge-to-address4")}</label>
-          <input id="ca4" type="text"></div>
-        <div class="fg"><label id="lbl-cc" for="cc">${t("charge-to-country")}</label>
-          <select id="cc">${countryOpts("")}</select></div>
-      </div>
-      <div>
-        <div class="fi"><label id="lbl-cph">${t("charge-to-phone")}:</label>
-          <input id="cph" type="tel"></div>
-        <div class="fi"><label id="lbl-cem">${t("charge-to-email")}:</label>
-          <input id="cem" type="email"></div>
-        <div class="fi"><label id="lbl-cvat">${t("vat-id")}:</label>
-          <input id="cvat" type="text"></div>
-      </div>
+    <div id="ct-fields">
+      <div class="fg"><label id="lbl-ctn" for="ctn">${t("charge-to-name")}</label>
+        <input id="ctn" type="text"></div>
+      <div class="fg"><label id="lbl-ca1" for="ca1">${t("charge-to-address1")}</label>
+        <input id="ca1" type="text"></div>
+      <div class="fg"><label id="lbl-ca2" for="ca2">${t("charge-to-address2")}</label>
+        <input id="ca2" type="text"></div>
+      <div class="fg"><label id="lbl-ca3" for="ca3">${t("charge-to-address3")}</label>
+        <input id="ca3" type="text"></div>
+      <div class="fg"><label id="lbl-ca4" for="ca4">${t("charge-to-address4")}</label>
+        <input id="ca4" type="text"></div>
+      <div class="fg"><label id="lbl-cc" for="cc">${t("charge-to-country")}</label>
+        <select id="cc">${countryOpts("")}</select></div>
+      <div class="fi"><label id="lbl-cph">${t("charge-to-phone")}:</label>
+        <input id="cph" type="tel"></div>
+      <div class="fi"><label id="lbl-cem">${t("charge-to-email")}:</label>
+        <input id="cem" type="email"></div>
+      <div class="fi"><label id="lbl-cvat">${t("vat-id")}:</label>
+        <input id="cvat" type="text"></div>
+      <div class="fi"><label id="lbl-creg">${t("registration-no")}:</label>
+        <input id="creg" type="text"></div>
     </div>
   </div>
 
@@ -604,7 +602,7 @@ function fillChargeTo(v) {
   const fields = document.getElementById("ct-fields");
 
   if (v === "" || v === "__other__") {
-    if (v === "") ["ctn","ca1","ca2","ca3","ca4","cc","cph","cem","cvat"].forEach(id => f(id, ""));
+    if (v === "") ["ctn","ca1","ca2","ca3","ca4","cc","cph","cem","cvat","creg"].forEach(id => f(id, ""));
     fields?.classList.remove("locked");
     return;
   }
@@ -614,7 +612,7 @@ function fillChargeTo(v) {
   f("ca2",  ct.address2);   f("ca3",  ct.address3);
   f("ca4",  ct.address4);   f("cc",   ct.country);
   f("cph",  ct.phone);      f("cem",  ct.email);
-  f("cvat", ct["vat-id"]);
+  f("cvat", ct["vat-id"]);  f("creg", ct["reg-no"]);
   fields?.classList.add("locked");
 
   // Auto-set invoice currency from recipient config
@@ -886,7 +884,7 @@ function relabel() {
     "lbl-idate":"invoice-date","lbl-icur":"invoice-currency","lbl-pcode":"project-code","lbl-ino":"invoice-no",
     "lbl-ctn":"charge-to-name","lbl-ca1":"charge-to-address1","lbl-ca2":"charge-to-address2",
     "lbl-ca3":"charge-to-address3","lbl-ca4":"charge-to-address4","lbl-cc":"charge-to-country",
-    "lbl-cph":"charge-to-phone","lbl-cem":"charge-to-email","lbl-cvat":"vat-id",
+    "lbl-cph":"charge-to-phone","lbl-cem":"charge-to-email","lbl-cvat":"vat-id","lbl-creg":"registration-no",
     "th-qty":"qty","th-uom":"uom","th-desc":"description","th-price":"price","th-tot":"line-total",
     "lbl-sub":"subtotal","lbl-paid":"paid","lbl-topay":"to-pay",
   };
@@ -980,7 +978,7 @@ function gatherData(renderLang) {
   const ctName = g("ctn");
   const ctAddr = [g("ca1"),g("ca2"),g("ca3"),g("ca4")].filter(Boolean);
   const ctCntry= COUNTRY_MAP[g("cc")] || "";
-  const ctPh   = g("cph"), ctEm = g("cem"), ctVat = g("cvat");
+  const ctPh   = g("cph"), ctEm = g("cem"), ctVat = g("cvat"), ctReg = g("creg");
 
   let sub = 0;
   const rows = [];
@@ -1034,14 +1032,14 @@ function gatherData(renderLang) {
   const toPay = sub + totalTax - paid;
 
   return { dl, td, sName, sAddr, sCntry, sPh, sEm, iDate, pCode, iNo, iCur,
-           ctName, ctAddr, ctCntry, ctPh, ctEm, ctVat,
+           ctName, ctAddr, ctCntry, ctPh, ctEm, ctVat, ctReg,
            rows, sub, taxes, totalTax, paid, toPay };
 }
 
 // ── Build HTML preview ────────────────────────────────────────────────────────
 function buildPreviewHTML() {
   const { td, sName, sAddr, sCntry, sPh, sEm, iDate, pCode, iNo, iCur,
-          ctName, ctAddr, ctCntry, ctPh, ctEm, ctVat,
+          ctName, ctAddr, ctCntry, ctPh, ctEm, ctVat, ctReg,
           rows, sub, taxes, paid, toPay } = gatherData();
 
   const linesHTML = rows.map(row => {
@@ -1089,6 +1087,7 @@ function buildPreviewHTML() {
       ${ctPh  ? `<span><strong>${h(td("charge-to-phone"))}:</strong> ${h(ctPh)}</span>` : ""}
       ${ctEm  ? `<span><strong>${h(td("charge-to-email"))}:</strong> ${h(ctEm)}</span>` : ""}
       ${ctVat ? `<span><strong>${h(td("vat-id"))}:</strong> ${h(ctVat)}</span>` : ""}
+      ${ctReg ? `<span><strong>${h(td("registration-no"))}:</strong> ${h(ctReg)}</span>` : ""}
     </div>
   </div>` : ""}
   <table class="d-lines">
@@ -1143,7 +1142,7 @@ function buildPDF() {
   const sp = (s,w)          => doc.splitTextToSize(String(s??""), w);
 
   const { dl, td, sName, sAddr, sCntry, sPh, sEm, iDate, pCode, iNo, iCur,
-          ctName, ctAddr, ctCntry, ctPh, ctEm, ctVat,
+          ctName, ctAddr, ctCntry, ctPh, ctEm, ctVat, ctReg,
           rows, sub, taxes, paid, toPay } = gatherData();
 
   // ── HEADER ────────────────────────────────────────────────────────────────
@@ -1199,6 +1198,7 @@ function buildPDF() {
     if (ctPh)  ctParts.push(`${td("charge-to-phone")}: ${ctPh}`);
     if (ctEm)  ctParts.push(`${td("charge-to-email")}: ${ctEm}`);
     if (ctVat) ctParts.push(`${td("vat-id")}: ${ctVat}`);
+    if (ctReg) ctParts.push(`${td("registration-no")}: ${ctReg}`);
     const ctContact = ctParts.join("   ");
 
     const boxH = 4.5 + 5 + 5.5 + bLines.length * 4.5 + (ctContact ? 4.5 : 0) + 4;