Calculation of Interest During Construction in Excel

The calculation of Interest During Construction is different from normal Interest. If you are looking for a way to calculate the interest during your construction period then this article will be helpful for you. The objective of this article is to explain the calculation of Interest During Construction in Excel.

What Is Interest During Construction?

Interest During Construction is the interest that is applied in the construction period. It is calculated on the debt for the project. You will need to know the debt, the interest rate, and some other variables to calculate Interest During Construction.

Step by Step Calculation of Interest During Construction in Excel

Here, I have taken the following dataset to explain this article. The Start Date and the End Date of the construction period are given. The annual Interest Rate is 8%. And the Debt in Year 1 is $88,500 and in Year 2 is $90,550. Now, I will show you the calculation of the Interest During Construction in Excel. Let’s see the steps.

Step-01: Select Drawdown Mode and Frequency

In this first step, I will show you how you can select the Drawdown Mode and the Drawdown Frequency in a dynamic way.

First, create a section for entering the Drawdown Mode and Drawdown Frequency.

Next, select the cell where you want to show the Drawdown Mode. Here, I selected cell C12.
Then, go to the Data tab.
Afterward, select Data Validation.

Consequently, the Data Validation dialog box will appear.
Select the Settings tab.
Then, Click on the drop-down button for Allow from Validation criteria.
After that, select List.

Then, write the options you want in the Source section.
Finally, select OK.

Next, you will see a drop-down button has been inserted in your selected cell which is cell C12.

To select Drawdown Mode, first Click on the drop-down button.
Then, select the mode you want. Here, I selected Quarterly.

After that, you will see that Quarterly is showing as Drawdown Mode.

Next, select the cell where you want to show the Drawdown Frequency. Here, I selected cell C13.
Then, in cell C13 write the following formula.

=IF(C12="Annually",12,IF(C12="Half Yearly",6,3))

Finally, press Enter and you will get your Drawdown Frequency.

🔎 How Does the Formula Work?

IF(C12=”Half Yearly”,6,3): Here, the IF function returns 6 if the logical_test is True. Otherwise, it returns 3.
IF(C12=”Annually”,12,IF(C12=”Half Yearly”,6,3)): Now, the IF function returns 12 if the logical_test is True. Otherwise, it will go to the next IF function.

Step-02: Create Table for Interest During Construction

Now, I will create a table where I will calculate everything I need for the Calculation of Interest During Construction in Excel.

In the beginning, create a table with 4 columns.
Then, name the columns as Date, Drawdown Amount, Cumulative Amount, and Interest.

Step-03: Insert Dates into Table

Here, I will insert the Dates for every drawdown period for the project.

Firstly, select the cell where you want the first Date.
Secondly, write the following formula in that selected cell.

=C4

Thirdly, press Enter to get the Date.

Here, the formula returns the value that is in cell C4. in this case, it returns the Start Date of the construction period.

Afterward, select the cell where you want the second Date. Here, I selected cell B18.
Then, in cell B18 write the following formula.

=IF(B17<$C$5,EDATE(B17,$C$13),"")

Next, press Enter to get the Date.

After that, drag the Fill Handle down to copy the formula to the other cells.

🔎 How Does the Formula Work?

EDATE(B17,$C$13): In the EDATE function, I selected B17 as start_date and C13 as months. The formula will return the date after the months in cell C13 from the date in cell B17.
IF(B17<$C$5,EDATE(B17,$C$13),””): Now, the IF function will check if the value in cell C5 is less than the value in cell C5. if the logical_test is True then the formula returns the Date generated by the EDATE function. Otherwise, it returns blank.

Note: Here, I used Absolute Cell References for the fixed values so that the formula does not change while using Autofill.

Next, you can see that I have copied the formula to the other cells and got my desired output.

In the following image, you can see that the last date is after the End Date. So, I will delete this date.

Finally, this is how my table looks at this stage.

Step-04: Calculate Drawdown Amount

In this step, I will calculate the Drawdown Amount for each period. The drawdown amount refers to the amount by which an investment is down from the peak before it reaches the peak.

First, select the cell where you want to calculate the Drawdown Amount for Year 1.
Then, write the following code in that selected cell.

=$C$9/(12/$C$13)

Next, press Enter to get the result.

Afterward, drag the Fill Handle down to copy the formula to 3 more cells.

Here, in the formula 12 is divided by the value in the cell C13 which is the Drawdown Frequency. And then, the Debt in Year 1 is divided by the result.

Finally, you can see that I have copied the formula and got the Drawdown Amount for Year 1.

Next, select the cell where you want to calculate the Drawdown Amount for Year 2. Here, I selected cell C21.
Then, in cell C21 write the following formula.

=$C$10/(12/$C$13)

After that, press Enter.

Further, drag the Fill Handle down to copy the formula to 3 more cells as the Drawdown Mode is Quarterly.

Now, 12 is divided by the value in cell C13 which is the Drawdown Frequency. And then, the Debt in Year 2 is divided by the result.

Here, you can see that I have copied the formula.

Step-05: Calculate Cumulative Amount

Now, I have reached the 5th step of calculation of Interest During Construction in Excel. In this step, I will calculate the Cumulative Amount.

Firstly, select the cell where you want the first Cumulative Amount. Here, I selected cell D17.
Secondly, in cell D17 write the following formula.

=C17

Thirdly, press Enter.

Here, the formula will return the value that is in cell C17.

After that, select the cell where you want to calculate the next Cumulative Amount.
Next, write the following formula in that selected cell.

=C18+D17

Then, press Enter.

Afterward, drag the Fill Handle down to copy the formula to the other cells.

Here, the formula returns the summation of the values in cells C17 and D17.

Lastly, you can see that I have copied the formula to the other cells and got the Cumulative Amount.

Step-06: Determine Interest

In this step, I will show you how you can determine your Interest.

In the beginning, select the cell where you want to calculate the Interest.
Next, write the following formula in that selected cell.

=D17*$C$6*($C$13/12)

After that, press Enter.

Then, drag the Fill Handle down to copy the formula.

Here, the Drawdown Frequency is divided by 12. And then the result is multiplied by the Interest Rate and Cumulative Amount.

Finally, you can see that I have copied the formula to the other cells and got the Interest.

Step-07: Calculating Interest During Construction in Excel

Now, I have reached the final step of my calculation for Interest During Construction in Excel. I will show you how you can calculate the Interest During Construction.

Firstly, select the cell where you want to calculate the Interest During Construction. Here, I selected cell E26.
Secondly, in cell E26 write the following formula.

=SUM(E17:E24)

Finally, press Enter to get the Interest During Construction.

Here, in the SUM function, I selected cell range E17:E24 as numbers. The formula returns the summation of the cell range E17:E24.

Final Output

In the following picture, you can see the final output of my calculation for Interest During Construction in Excel.

Download Practice Workbook

You can download the practice workbook from here.

Calculating Interest During Construction.xlsx

Conclusion

So, you have reached the end of my article. Here, I tried to cover the calculation of Interest During Construction in Excel. I hope it was clear to you. If you have any questions or suggestions, feel free to let me know in the comment section below.

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