diff --git a/src/components/TransactionImportDialog.vue b/src/components/TransactionImportDialog.vue
index 0624dafc..16664ef7 100644
--- a/src/components/TransactionImportDialog.vue
+++ b/src/components/TransactionImportDialog.vue
@@ -165,6 +165,7 @@
   import FileInput from './FileInput.vue';
 
   import Upload from 'vue-material-design-icons/Upload.vue';
+  import { Utils } from '../utils/utils';
 
   const transactionService = useTransactionService();
   const splitStore = useSplitStore();
@@ -214,7 +215,7 @@
       lines: [],
       isValid: false,
       validator: (line) => {
-        return !Number.isNaN(Number(line));
+        return !Number.isNaN(Utils.parseNumber(line, decimalSeparator.value));
       }
     }
   });
diff --git a/src/utils/utils.spec.ts b/src/utils/utils.spec.ts
index ab3f4a5d..f06a90d1 100644
--- a/src/utils/utils.spec.ts
+++ b/src/utils/utils.spec.ts
@@ -37,4 +37,23 @@ describe('Utils', () => {
       ]);
     });
   });
+
+  describe('parseNumber', () => {
+    it('should return a number of a string', () => {
+      expect(Utils.parseNumber('123.456')).to.be.equal(123.456);
+    });
+
+    it('should return NaN if it is not a parseable number', () => {
+      expect(Utils.parseNumber('abc')).to.be.NaN;
+    });
+
+    it('should respect decimal separator', () => {
+      expect(Utils.parseNumber('123,456', ',')).to.be.equal(123.456);
+    });
+
+    it('should ignore thousand separators', () => {
+      expect(Utils.parseNumber('12,345.678')).to.be.equal(12345.678);
+      expect(Utils.parseNumber('12.456,789', ',')).to.be.equal(12456.789);
+    });
+  });
 });
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index 5451ebd8..e38fec1f 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -56,4 +56,13 @@ export class Utils {
       decimalDigits ? `${decimalSeparator}${decimalDigits}` : ''
     }`;
   }
+
+  public static parseNumber(numberString: string, decimalSeparator = '.'): number {
+    return Number(
+      numberString
+        .replace(decimalSeparator, '#')
+        .replace(/[\s,.]+/, '')
+        .replace('#', '.'));
+  }
+
 }