diff --git a/financial/price_plus_tax.py b/financial/price_plus_tax.py
new file mode 100644
index 000000000000..43876d35e57c
--- /dev/null
+++ b/financial/price_plus_tax.py
@@ -0,0 +1,18 @@
+"""
+Calculate price plus tax of a good or service given its price and a tax rate.
+"""
+
+
+def price_plus_tax(price: float, tax_rate: float) -> float:
+    """
+    >>> price_plus_tax(100, 0.25)
+    125.0
+    >>> price_plus_tax(125.50, 0.05)
+    131.775
+    """
+    return price * (1 + tax_rate)
+
+
+if __name__ == "__main__":
+    print(f"{price_plus_tax(100, 0.25) = }")
+    print(f"{price_plus_tax(125.50, 0.05) = }")