Sloan accrual ratio explained

What the Sloan ratio measures

Accrual accounting records revenue when earned and expenses when incurred, not necessarily when cash moves. The gap between net income and cash from operations is total accruals — working capital changes, non-cash charges, timing differences, and (sometimes) aggressive estimates. Sloan's insight: when accruals are unusually large relative to the firm's asset base, those non-cash components are more likely to reverse, dragging future earnings below what the current income statement implies.

This is distinct from fraud detection. High Sloan accruals can reflect legitimate growth investment, acquisition accounting, or industry seasonality — not manipulation. The signal targets earnings persistence and post-earnings drift, not AAER enforcement. Manipulation screens like Beneish focus on year-over-year index changes that discriminate known manipulators; Sloan focuses on whether today's profit is cash-backed enough to survive into next year.

Formulas and computation

Cash-flow statement method (most common)

Compute total accruals as net income minus cash from operations (CFO), then scale by average total assets:

Sloan accrual ratio = (Net Income − CFO) / Average Total Assets

Use consecutive fiscal-year 10-K data. Average assets = (beginning total assets + ending total assets) / 2. Some practitioners use lagged assets in the denominator; document your choice and keep it consistent across the universe.

Balance-sheet method

An alternative derives accruals from the change in non-cash balance-sheet items (excluding cash and short-term debt):

Accruals = ΔNon-cash current assets − ΔCurrent liabilities (excl. short-term debt) − Depreciation

Scale the result by average total assets. The balance-sheet method can diverge from the cash-flow method when acquisitions, FX translation, or pension remeasurements move accounts without flowing through CFO cleanly. Harbor Software uses the cash-flow method as primary and balance-sheet as a tie-breaker when CFO is distorted by one-time items.

Percentage-of-income variant

Analysts sometimes report accruals as (Net Income − CFO) / Net Income. This is intuitive for single-name review but less comparable across loss-making firms. The asset-scaled Sloan ratio remains the standard for cross-sectional sorts.

The accrual anomaly and decile sorts

Sloan's original sample sorted all NYSE/AMEX firms into deciles by accruals each June. The highest-accrual decile underperformed the lowest-accrual decile by roughly 10 percentage points annually over the following year — a spread that survived transaction costs in early replications, though magnitude varies by era and universe.

The mechanism is earnings persistence. Cash-heavy earnings tend to continue; accrual-heavy earnings mean-revert as receivables collect, inventory clears, deferred revenue amortizes, or reserves release. Markets sometimes overreact to headline EPS without fully pricing how much of it is non-cash, creating post-earnings drift when reality catches up.

• Top decile (high accruals) — elevated risk of negative earnings surprises and downward estimate revisions.
• Bottom decile (low/negative accruals) — cash earnings often exceed reported profit; persistence tends to be higher.
• Middle deciles — weak standalone signal; most production workflows focus on extremes.

Negative Sloan ratios (CFO > net income) are not automatically “good” — they can reflect prepayment, aggressive cost capitalization reversal, or unsustainable working-capital squeezes. Context from earnings quality footnotes still matters.

Harbor Software refactor

Harbor's first pass flagged every name above the 80th percentile Sloan accruals in the Russell 2000 growth index — 22% of the book. Analysts ignored most flags because high-growth software routinely shows positive accruals during billings ramps. Exit churn and missed winners made the overlay unusable.

Layer 1 — sector exclusions. Removed banks, insurers, REITs, and upstream energy where balance-sheet accruals are structurally unlike operating companies.

Layer 2 — two-year CFO trend. Required CFO / net income below 0.7 for two consecutive fiscal years before a top-decile flag triggered a position review. One-year spikes from a large contract prepayment no longer fired alone.

Layer 3 — accrual decomposition. For flagged names, analysts split accruals into working-capital vs non-cash expense buckets using the indirect-method CFO bridge. Receivables-driven accruals routed to high-priority review; deferred-revenue-driven accruals in subscription models routed to a separate SaaS playbook.

Layer 4 — estimate-revision overlay. Top-decile Sloan plus downward consensus EPS revisions in the prior 90 days escalated to a mandatory trim. Accruals alone became a watchlist, not an auto-sell.

Post-refactor, flagged names fell from 22% to under 4% of the growth book. Earnings-disappointment capture stayed above 90% in the software subsample while false-positive-driven exits dropped from 24% to 5%.

Decision table: Sloan vs related screens

Production stacks combine Sloan deciles for persistence risk, Beneish for manipulation triage, and FCF conversion for single-name confirmation — three lenses on the same accrual-vs-cash tension.

Common pitfalls

• Treating top decile as fraud proof — Sloan measures persistence, not intent. Many high-accrual growers are honest.
• Ignoring sector structure — subscription SaaS, construction, and insurers produce accrual patterns the original Sloan sample did not emphasize.
• One-year snapshots — a single spike from an acquisition or working-capital swing creates false flags; use multi-year trends.
• Mixing formulas — cash-flow and balance-sheet methods are not interchangeable; pick one and document it.
• Look-ahead bias in backtests — use filing-date-lagged 10-K data, not restated numbers you only know ex post.
• Shorting on accruals alone — the anomaly has weakened in some periods; combine with catalysts and risk limits.
• Excluding SBC blindly — adding stock-based comp back to CFO flatters conversion; decide whether your mandate treats SBC as cash or non-cash and stay consistent.

Production checklist

• Define investable universe and sector exclusion list (financials, REITs, etc.).
• Pull consecutive fiscal-year 10-K data with filing-date lag enforced.
• Compute Sloan ratio via cash-flow method; log NI, CFO, and average assets.
• Rank into deciles annually (or monthly with stale filing guardrails).
• Route top-decile names to accrual decomposition (WC vs non-cash expense).
• Require two-year CFO / net income trend before mandatory position review.
• Cross-check top decile against Beneish TATA and DSRI for manipulation overlap.
• Read receivables, deferred revenue, and capitalization footnotes on flagged names.
• Overlay consensus estimate revisions for escalation triggers.
• Archive decile assignments and component values for audit trail.

Key takeaways

• The Sloan accrual ratio scales (net income minus CFO) by average assets to rank earnings persistence risk.
• Top-decile accruals historically predict weaker subsequent returns and more negative earnings surprises.
• Harbor Software's layered refactor cut false-positive exits from 24% to 5% while preserving disappointment capture.
• Sloan complements Beneish and FCF conversion — persistence vs manipulation vs single-name cash backing.
• Use multi-year trends, sector exclusions, and footnote decomposition — never trade deciles blindly.

Related reading

• Earnings quality explained — accruals, cash conversion, and accounting red flags
• Beneish M-score explained — manipulation detection and forensic screening
• Free cash flow conversion rate explained — FCF backing of reported profit
• Accrued liabilities explained — expense-before-cash obligations and CFO bridges