Aging Buckets
Enter your receivables data, then click analyze.
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What This Calculator Does
This accounts receivable aging calculator helps accountants, bookkeepers, controllers, and business owners analyze outstanding receivables by aging bucket. It calculates Days Sales Outstanding (DSO), Collection Effectiveness Index (CEI), weighted average age of receivables, and estimated bad debt exposure. The tool segments your AR into current, 31-60 days, 61-90 days, and over 90 days buckets, showing the percentage distribution and applying industry-standard uncollectible rates to estimate your allowance for doubtful accounts.
The Formula
DSO measures the average number of days it takes to collect payment after a sale. A lower DSO indicates faster collections. The formula divides total AR by daily revenue to express the receivable balance in terms of days of sales. The Collection Effectiveness Index (CEI) measures how effectively you collected receivables that were available to collect during a period. CEI above 80% is considered good. The weighted average age multiplies each aging bucket balance by its midpoint age and divides by total AR to produce a single metric.
Step-by-Step Example
Enter aging buckets
Current (0-30 days): $150,000. 31-60 days: $45,000. 61-90 days: $18,000. Over 90 days: $7,000. Total AR: $220,000.
Enter revenue data
Annual revenue: $2,000,000. Daily revenue: $5,479.
Calculate DSO
DSO = $220,000 / $5,479 = 40.2 days. This is within the healthy range for most industries.
Review bad debt exposure
Using standard aging rates (1%, 5%, 15%, 40%), estimated bad debt exposure is $1,500 + $2,250 + $2,700 + $2,800 = $9,250 or 4.2% of total AR.
Real-World Use Cases
Monthly AR Reviews
Controllers and bookkeepers can run aging reports to identify collection problems early and prioritize follow-up on overdue accounts.
Audit Preparation
Calculate the allowance for doubtful accounts using the aging method to support year-end financial statements and audit documentation.
Cash Flow Forecasting
Use DSO trends to predict when receivables will convert to cash and plan for upcoming expenses and debt payments.
Common Mistakes to Avoid
Using total revenue instead of credit sales when calculating DSO. If a significant portion of revenue is cash or prepaid, including it inflates the denominator and understates DSO.
Not tracking DSO trends over time. A single DSO number is less meaningful than the trend. Rising DSO over several months signals deteriorating collections.
Applying the same uncollectible rate to all aging buckets. Older receivables are significantly more likely to become uncollectible. The over-90-day bucket typically has 30% to 50% default rates.
Ignoring customer concentration risk. If one large customer represents a significant portion of your AR and falls behind, your actual bad debt exposure could far exceed the aging-based estimate.
Not reconciling the aging report to the general ledger AR balance. Discrepancies indicate data entry errors, unapplied payments, or missing invoices.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides estimates based on the receivable balances and rates you enter. Actual bad debt experience depends on customer creditworthiness, economic conditions, and collection practices. Always reconcile aging reports to your general ledger. Consult your accountant or auditor for GAAP-compliant allowance calculations.
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