{"id":53834,"date":"2026-06-30T16:57:35","date_gmt":"2026-06-30T11:27:35","guid":{"rendered":"https:\/\/www.tatacapital.com\/blog\/?p=53834"},"modified":"2026-06-30T16:58:07","modified_gmt":"2026-06-30T11:28:07","slug":"what-is-cumulative-interest","status":"publish","type":"post","link":"https:\/\/www.tatacapital.com\/blog\/personal-use-loan\/what-is-cumulative-interest\/","title":{"rendered":"What is a cumulative interest?"},"content":{"rendered":"\n

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Cumulative interest refers to the total interest you have accumulated or paid over a defined period. Its meaning and calculation vary depending on whether it is being applied to a loan or an investment. If you are looking at a loan, cumulative interest is the sum of all interest payments made over time. On the other hand, an investment comprises reinvested interest earnings that earn more interest through compounding. You can make better borrowing decisions if you understand cumulative interest, as it helps you estimate the true cost of credit.<\/em><\/strong><\/p>\n\n\n\n

To calculate cumulative interest, you must add all interest payments made on a loan, or earned on an investment, over a specific time period.<\/p>\n\n\n\n

If you have ever wondered how much interest you have paid on a loan or earned on your savings over time, cumulative interest gives you the complete picture. It is the total interest accrued on a loan, investment, or deposit over a specific period. It sums up all the interest amounts that build up during the chosen period, making it easier to understand the true cost of borrowing<\/a> or the actual return on your money. Since many people want to calculate cumulative interest quickly and accurately, this guide focuses on what cumulative interest means, its calculation formula, and how to calculate it using both Excel and a calculator. It also walks you through a worked example.<\/p>\n\n\n\n

What is cumulative interest?<\/strong><\/h2>\n\n\n\n

Cumulative interest means the total amount of interest charged or earned over a specific period. On a loan, it is the interest paid throughout the loan tenure. For a deposit or investment, it is the total interest earned by the time it matures. It is different from periodic interest, which shows the interest for a single month, quarter, or year. While periodic interest looks at one period at a time, cumulative interest adds together the interest from all periods to show the overall amount.<\/p>\n\n\n\n

How does cumulative interest work?<\/strong><\/h2>\n\n\n\n

Cumulative interest totals the interest earned or charged on an investment or a loan, respectively, over time. Here\u2019s how it works on the two financial products:<\/p>\n\n\n\n

    \n
  1. On loans and debt:<\/strong> It is the total of the interest portions included in all Equated Monthly Installments (EMIs)<\/a> paid so far or across the entire loan tenure<\/a>.<\/li>\n\n\n\n
  2. On savings and investments:<\/strong> The interest keeps accumulating and may earn additional interest through compounding. By the time the deposit matures, the accumulated interest represents the cumulative interest earned during the investment period.<\/li>\n<\/ol>\n\n\n\n

    Cumulative interest vs Compound interest: Are they the same?<\/strong><\/h2>\n\n\n\n

    Many people wonder, \u201cAre cumulative interest and compound interest the same?\u201d No, they are not. Compound interest calculates interest where you earn or pay interest not only on the original principal but also on previously accumulated interest. On the other hand, cumulative interest is the total amount of interest that has accumulated over a period.<\/p>\n\n\n\n

    Let\u2019s understand this with the help of an example.<\/p>\n\n\n\n

    If you invest Rs. 1 lakh at 8% compound interest for 3 years, you will earn a total interest of Rs. 25,971. The interest earned each year is added to the principal, resulting in a higher amount. On the other hand, if you calculate the yearly interest using the simple interest method, you will earn an interest of Rs. 8,000 per year. As a result, the cumulative interest will be Rs. 24,000.<\/p>\n\n\n\n

    Also Read – FD vs. mutual funds<\/a><\/p>\n\n\n\n

    What is the cumulative interest formula?<\/strong><\/h2>\n\n\n\n

    The formula for how to calculate cumulative interest depends on how interest is calculated. If interest is calculated separately for each period, cumulative interest is calculated as follows:<\/p>\n\n\n\n

    Cumulative interest = Sum of each period\u2019s interest<\/strong><\/p>\n\n\n\n

    For calculating compound interest, the formula is:<\/p>\n\n\n\n

    A = P(1 + r\/n) ^ (nt)<\/strong>, where,<\/p>\n\n\n\n

    P is the principal amount<\/p>\n\n\n\n

    r is the annual interest rate<\/p>\n\n\n\n

    n is the number of compounding periods per year<\/p>\n\n\n\n

    To calculate cumulative interest for a compound interest investment, the formula is:<\/p>\n\n\n\n

    A – P, where<\/p>\n\n\n\n

    A is the maturity value<\/p>\n\n\n\n

    P is the principal amount<\/p>\n\n\n\n

    How to calculate cumulative interest (with example)?<\/strong><\/h3>\n\n\n\n

    To calculate cumulative interest, here are the steps you need to follow:<\/p>\n\n\n\n

      \n
    1. Calculate yearly interest by multiplying the principal amount by the interest rate.<\/li>\n\n\n\n
    2. Add the interest from each year.<\/li>\n<\/ol>\n\n\n\n

      So, suppose you invest Rs. 1 lakh at 10% simple interest for 3 years, the yearly interest calculation will be as follows:<\/p>\n\n\n\n

      <\/p>\n\n\n\n

      Year<\/strong><\/td>Interest rate<\/strong><\/td>Interest amount<\/strong><\/td>Cumulative interest<\/strong><\/td><\/tr>
      1<\/td>10%<\/td>Rs. 10,000<\/td>Rs. 10,000<\/td><\/tr>
      2<\/td>10%<\/td>Rs. 10,000<\/td>Rs. 20,000<\/td><\/tr>
      3<\/td>10%<\/td>Rs. 10,000<\/td>Rs. 30,000<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

      The cumulative interest at the end of 3 years will be Rs. 30,000. The maturity value will be Rs. 1,30,000.<\/p>\n\n\n\n

      How to calculate cumulative interest in Excel (CUMIPMT)?<\/strong><\/h3>\n\n\n\n

      Excel allows you to easily calculate cumulative interest using CUMIPMT.<\/p>\n\n\n\n

      = CUMIPMT(rate, nper, pv, start_period, end_period, type)<\/strong><\/p>\n\n\n\n

      Here, the meaning of each metric is as follows:<\/p>\n\n\n\n

      <\/p>\n\n\n\n

      rate<\/td>interest rate per period<\/td><\/tr>
      nper<\/td>total number of payment periods<\/td><\/tr>
      pv<\/td>loan amount<\/td><\/tr>
      start_period; end_period<\/td>the term or range you want to analyze<\/td><\/tr>
      type<\/td>0 for end-of-period payments 1 for beginning-of-period payments<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

      For example, if you have a loan of Rs. 10 lakh at 9% interest rate for a tenure of 20 years with EMIs, the figures in the function will be as follows:<\/p>\n\n\n\n

      = CUMIPMT (9%\/12, 20X12, 1000000, 1, 12, 0)<\/strong><\/p>\n\n\n\n

      This returns the total interest paid during the first 12 EMIs. Always ensure the rate matches the payment period, such as a monthly rate for monthly EMIs.<\/p>\n\n\n\n

      How to use a cumulative interest calculator?<\/strong><\/h2>\n\n\n\n

      You can use a cumulative interest calculator to quickly find the total interest earned or paid over a chosen period. All you need to do is enter the principal amount, interest rate, tenure, and compounding frequency (if applicable).<\/p>\n\n\n\n