diff --git a/src/EPR.Calculator.API.UnitTests/UtilTest.cs b/src/EPR.Calculator.API.UnitTests/UtilTest.cs
index c7bd104..27d8cb2 100644
--- a/src/EPR.Calculator.API.UnitTests/UtilTest.cs
+++ b/src/EPR.Calculator.API.UnitTests/UtilTest.cs
@@ -58,5 +58,78 @@ public void GetParameterValueTest_For_Percent()
             Assert.IsNotNull(parameterValue);
             Assert.AreEqual(parameterValue, "100");
         }
+
+        /// <summary>
+        /// Tests that GetFinancialYearAsYYYY returns the first year from a valid financial year string.
+        /// </summary>
+        /// <param name="financialYear">The financial year string to parse.</param>
+        /// <param name="expectedFinancialYear">The expected first year as a string.</param>
+        [TestMethod]
+        [DataRow("2024-25", "2024")]
+        [DataRow("2023-24", "2023")]
+        [DataRow("2022-23", "2022")]
+        public void GetFinancialYearAsYYYY_ValidString_ShouldReturnFirstYear(string financialYear, string expectedFinancialYear)
+        {
+            var result = Util.GetFinancialYearAsYYYY(financialYear);
+            Assert.AreEqual(expectedFinancialYear, result);
+        }
+
+        /// <summary>
+        /// Tests that GetFinancialYearAsYYYY throws a FormatException for an invalid string.
+        /// </summary>
+        /// <param name="financialYear">The invalid financial year string to parse.</param>
+        [TestMethod]
+        [DataRow("2024")]
+        [DataRow("24-25")]
+        [DataRow("2024-2025")]
+        [DataRow("abcd-efgh")]
+        public void GetFinancialYearAsYYYY_InvalidString_ShouldThrowFormatException(string financialYear)
+        {
+            var exception = Assert.ThrowsException<FormatException>(() => Util.GetFinancialYearAsYYYY(financialYear));
+            Assert.AreEqual("Financial year format is invalid. Expected format is 'YYYY-YY'.", exception.Message);
+        }
+
+        /// <summary>
+        /// Tests that GetFinancialYearAsYYYY throws a ArgumentException for a null or empty string.
+        /// </summary>
+        /// <param name="financialYear">The null or empty financial year string to convert.</param>
+        [TestMethod]
+        [DataRow(null)]
+        [DataRow("")]
+        [DataRow(" ")]
+        public void GetFinancialYearAsYYYY_NullOrEmptyString_ShouldThrowArgumentException(string financialYear)
+        {
+            var exception = Assert.ThrowsException<ArgumentException>(() => Util.GetFinancialYearAsYYYY(financialYear));
+            Assert.AreEqual("Financial year cannot be null or empty (Parameter 'value')", exception.Message);
+        }
+
+        /// <summary>
+        /// Tests that GetCalendarYear returns the previous year as a string for a valid financial year string.
+        /// </summary>
+        /// <param name="financialYear">The financial year string to convert.</param>
+        /// <param name="expectedCalendarYear">The expected previous calendar year as a string.</param>
+        [TestMethod]
+        [DataRow("2024-25", "2023")]
+        [DataRow("2023-24", "2022")]
+        [DataRow("2022-23", "2021")]
+        public void GetCalendarYear_ValidString_ShouldReturnPreviousYearAsString(string financialYear, string expectedCalendarYear)
+        {
+            var result = Util.GetCalendarYear(financialYear);
+            Assert.AreEqual(expectedCalendarYear, result);
+        }
+
+        /// <summary>
+        /// Tests that GetCalendarYear throws an ArgumentException for a null or empty string.
+        /// </summary>
+        /// <param name="financialYear">The null or empty financial year string to convert.</param>
+        [TestMethod]
+        [DataRow(null)]
+        [DataRow("")]
+        [DataRow(" ")]
+        public void GetCalendarYear_NullOrEmptyString_ShouldThrowArgumentException(string financialYear)
+        {
+            var exception = Assert.ThrowsException<ArgumentException>(() => Util.GetCalendarYear(financialYear));
+            Assert.AreEqual("Financial year cannot be null or empty (Parameter 'financialYear')", exception.Message);
+        }
     }
 }
diff --git a/src/EPR.Calculator.API/Controllers/CalculatorInternalController.cs b/src/EPR.Calculator.API/Controllers/CalculatorInternalController.cs
index 4547855..5f17409 100644
--- a/src/EPR.Calculator.API/Controllers/CalculatorInternalController.cs
+++ b/src/EPR.Calculator.API/Controllers/CalculatorInternalController.cs
@@ -5,6 +5,7 @@
 using EPR.Calculator.API.Enums;
 using EPR.Calculator.API.Exporter;
 using EPR.Calculator.API.Models;
+using EPR.Calculator.API.Utils;
 using EPR.Calculator.API.Validators;
 using EPR.Calculator.API.Wrapper;
 using Microsoft.AspNetCore.Mvc;
@@ -68,7 +69,7 @@ public IActionResult UpdateRpdStatus([FromBody] UpdateRpdStatus request)
                     var stagingOrganisationData = this.wrapper.GetOrganisationData();
                     var calcOrganisationMaster = new CalculatorRunOrganisationDataMaster
                     {
-                        CalendarYear = "2023", //Take the financial year from Calc Run table and Derive the Calendar year
+                        CalendarYear = Util.GetCalendarYear("2024-25"), //Take the financial year from Calc Run table and Derive the Calendar year
                         CreatedAt = DateTime.Now,
                         CreatedBy = request.UpdatedBy,
                         EffectiveFrom = DateTime.Now,
diff --git a/src/EPR.Calculator.API/Utils/Util.cs b/src/EPR.Calculator.API/Utils/Util.cs
index 3fba1ef..edb0a50 100644
--- a/src/EPR.Calculator.API/Utils/Util.cs
+++ b/src/EPR.Calculator.API/Utils/Util.cs
@@ -1,6 +1,7 @@
 using EPR.Calculator.API.Data.DataModels;
 using EPR.Calculator.API.Dtos;
 using System.Text;
+using System.Text.RegularExpressions;
 
 namespace EPR.Calculator.API.Utils
 {
@@ -195,5 +196,46 @@ public static CreateLapcapDataErrorDto CreateLapcapDataErrorDto(string country,
                 UniqueReference = uniqueReference
             };
         }
+
+        /// <summary>
+        /// Extracts the first year from a financial year string in the format "YYYY-YY".
+        /// </summary>
+        /// <param name="value">The financial year string to parse, in the format "YYYY-YY".</param>
+        /// <returns>The first year as a string.</returns>
+        /// <exception cref="FormatException">Thrown when the format is invalid.</exception>
+        public static string GetFinancialYearAsYYYY(string value)
+        {
+            if (string.IsNullOrWhiteSpace(value))
+            {
+                throw new ArgumentException("Financial year cannot be null or empty", nameof(value));
+            }
+
+            string pattern = @"^\d{4}-\d{2}$";
+            TimeSpan regexTimeout = TimeSpan.FromSeconds(1);
+            if (!Regex.IsMatch(value, pattern, RegexOptions.None, regexTimeout))
+            {
+                throw new FormatException("Financial year format is invalid. Expected format is 'YYYY-YY'.");
+            }
+
+            var years = value.Split('-');
+            return years[0];
+        }
+
+        /// <summary>
+        /// Converts a financial year string to the previous calendar year as a string.
+        /// </summary>
+        /// <param name="financialYear">The financial year string to convert, in the format "YYYY-YY".</param>
+        /// <returns>The previous calendar year as a string.</returns>
+        /// <exception cref="ArgumentException">Thrown when the financial year string is null or empty.</exception>
+        public static string GetCalendarYear(string financialYear)
+        {
+            if (string.IsNullOrWhiteSpace(financialYear))
+            {
+                throw new ArgumentException("Financial year cannot be null or empty", nameof(financialYear));
+            }
+
+            int year = int.Parse(GetFinancialYearAsYYYY(financialYear));
+            return (year - 1).ToString();
+        }
     }
 }