Bad Debt Reserve Explained
Bad Debt Reserve (also known as allowance for doubtful accounts) is a contra-asset account on the balance sheet that reduces the net value of accounts receivable. It represents management's best estimate of how much of the outstanding AR will never be collected.
Under accrual accounting (GAAP and IFRS), companies must estimate and record expected credit losses before they actually occur. This is the matching principle at work: the expense of bad debt is recognized in the same period as the revenue that created the receivable.
For B2B companies, the bad debt reserve is typically calculated using the aging method — applying increasing loss percentages to older receivables. A well-calibrated reserve gives investors and lenders confidence in the true value of your AR, while an under-reserved balance overstates assets and can lead to nasty surprises at year-end.
What You Need to Know About Bad Debt Reserve
- It's a contra-asset, not an expense account. The reserve sits on the balance sheet and reduces net AR. The corresponding bad debt expense hits the income statement when the reserve is increased.
- The aging method is most common in B2B. Apply escalating loss percentages by aging bucket: 1% for current, 5% for 31-60 days, 15% for 61-90 days, 40% for 91-120 days, 75%+ for 120+ days.
- Under-reserving is a red flag for auditors. If your actual write-offs consistently exceed your reserve, your estimates are too aggressive — and your financial statements may be misleading.
- Review and adjust quarterly. As your AR portfolio changes, your reserve should change too. A spike in aged receivables should trigger an immediate reserve adjustment.
- Better collections = lower reserve needed. Every dollar you collect from overdue accounts reduces the reserve you need to carry, directly improving your reported net AR.
How to Calculate Bad Debt Reserve (Aging Method)
Typical loss percentages by aging bucket: Current: 1% | 1-30 days past due: 3% | 31-60 days: 8% | 61-90 days: 20% | 91-120 days: 40% | 120+ days: 75%. Adjust based on your company's actual historical loss experience.
Bad Debt Reserve in Practice: B2B Example
Scenario: Distribution Company, Year-End
Total AR: $2,000,000
Current (not yet due): $1,200,000 × 1% = $12,000
1-30 days past due: $400,000 × 3% = $12,000
31-60 days past due: $200,000 × 8% = $16,000
61-90 days past due: $120,000 × 20% = $24,000
90+ days past due: $80,000 × 50% = $40,000
Required Bad Debt Reserve: $104,000 (5.2% of total AR)
Balance sheet impact: Net AR is reported as $1,896,000 ($2,000,000 - $104,000). If the company can reduce its 90+ day bucket from $80,000 to $20,000, the reserve drops to $74,000 — adding $30,000 to reported net AR.
How AgentCollect Reduces Your Bad Debt Reserve
Shrink Your Reserve by Collecting More
AgentCollect AI agents dramatically reduce the volume of aged receivables — the primary driver of bad debt reserves. By contacting overdue accounts within days (not months), fewer invoices migrate to the high-loss aging buckets that inflate your reserve.
Clients using AgentCollect typically see their 90+ day bucket shrink by 40-60%, which directly reduces the bad debt reserve required on their balance sheet. That improvement flows straight to net AR and strengthens your borrowing base for asset-based lending.
Related AR Glossary Terms
Bad Debt Reserve FAQ
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