Overdue interest calculator
Work out interest at the rate written in your own terms using your own figures. Check the assumptions before you act on the result.
Your figures
Result
- Overdue interest
- ₹12,575.34
How it is worked out
interest = overdue amount x agreed yearly rate x days overdue ÷ 365
overdue_interest = overdue_amount*agreed_rate_percent/100*days_overdue/365
What it works out
The overdue interest calculator turns records from the business into a figure for this decision: interest at the rate written in your own terms. Use it when the responsible accountant and owner needs a consistent answer for this specific task. The answer uses only the values entered. Record the measurement period beside it.
What you need
| Input | Unit | Where to find it |
|---|---|---|
| Overdue amount (example: ₹6,80,000) | ₹ | Read overdue amount from the invoice-wise Tally ledger, bank statement or cash report. |
| Agreed rate percent (example: 15 %) | % | Use the applicable agreement, portal, bank statement or current verified rule for agreed rate percent. |
| Days overdue (example: 45 days) | days | Enter days overdue using the current job, register or approved business plan. |
Use the same item, period and measurement unit for related inputs. If a figure comes from an estimate rather than an actual record, mark it as estimated. Keep your original figures beside the result.
The formula
In plain words, calculate overdue interest using the measured inputs below. The expressions are shown without hidden rounding so they can be checked by hand.
- overdue interest:
overdue_interest = overdue_amount*agreed_rate_percent/100*days_overdue/365.
Formula basis from the supplied taxonomy: interest = overdue amount x agreed yearly rate x days overdue ÷ 365. The calculation assumes the named inputs describe the same job and accounting period. Keep quantities, rates and measured units consistent.
A worked example
Illustrative example: a distribution business uses the figures in the table above. These are example inputs, not industry averages. For this example, the main figures are overdue amount: ₹6,80,000, agreed rate percent: 15 %, days overdue: 45 days.
- Overdue interest:
overdue_amount*agreed_rate_percent/100*days_overdue/365. With the example figures,680000.0 * 15.0 / 100 * 45.0 / 365gives ₹12,575.34.
How to act: Use the result to decide which customer record needs follow-up. Write down the input date and the assumption that could move most.
How to read the result
Example bands, change them for your business:
- Comfortable: Your result meets the target for this item or reporting period. Keep the calculation with its source records and decide which customer record needs follow-up.
- Watch: The result is close to your action limit, or it changed since the previous calculation. Recheck overdue amount and agreed rate percent using the original records.
- Act: The result breaks a limit already agreed by the manager or owner. Record the difference, name a responsible person, and agree a correction date. For an operational starting point, read [Customers paying late](/problems/customers-paying-late) and [Invoice to payment](/processes/invoice-to-payment). Do not use these example bands as published industry benchmarks.
Copy it into a spreadsheet
Create a sheet with column A for the label and column B for the number or formula. The expressions work in Excel or Google Sheets. Keep input cells editable and result cells protected from typing.
| Cell | Label | Value or formula |
|---|---|---|
| B2 | overdue amount | 680000.000000 |
| B3 | agreed rate percent | 15.000000 |
| B4 | days overdue | 45.000000 |
| B6 | overdue interest | =((((B2*B3)/100)*B4)/365) |
For any formula containing a divisor, enter a value above zero. For any monetary output, format the cell in Indian rupees. Do not replace the cells with rounded figures until the final display.
What this calculator leaves out
- Interest estimates and collection ratios cannot tell whether a customer can pay.
- A single average can hide unusual lots, customers or weeks. Review the underlying entries before making a large decision.
- The formula does not check whether the records are complete. Use invoice-wise due dates from the customer ledger. Keep promises, deductions and disputes visible.
Common mistakes
- Mixing periods. Using overdue amount from one month with agreed rate percent from another produces a number that looks precise but is hard to act on.
- Trusting old figures. Recheck the relevant source record before reusing last month's saved inputs. Prioritise overdue amounts with clear documents and a customer owner assigned.
- Treating an estimate as approval. Record which assumptions were entered by hand. Get the relevant owner, accountant or technician to check unusual values.
A number like this helps only if someone works it out again when things change.
Questions people ask
Where do I find the numbers for overdue interest calculator?
Read overdue amount from the invoice-wise Tally ledger, bank statement or cash report. Use the applicable agreement, portal, bank statement or current verified rule for agreed rate percent. Keep all inputs from the same period.
Can I use this number to approve a purchase or payment?
Use it as a first check. Use the result to decide which customer record needs follow-up. Write down the input date and the assumption that could move most. If the result affects tax, legal duties, workplace safety or a major investment, obtain the appropriate review.
When should I calculate it again?
Recalculate when a meaningful input changes, and at the next regular review of the relevant register. Save the date and the input values so changes can be explained.