
Bad Debt Reserve Accounting: Allowance Method vs. Direct Write-Off, and the Collection KPIs That Keep Your Reserve Honest
GAAP requires the allowance method while the IRS requires direct write-off under Section 166, so most accrual-basis businesses run both and reconcile the difference. This guide gives the journal entries for each, three ways to estimate the reserve (percentage of credit sales, an aging schedule, specific identification), and the five collection KPIs — DSO, CEI, current-bucket share, bad debt to sales, and average days delinquent — that reveal when a reserve has drifted from reality.










