How do you model deferred taxes in a detailed DCF?

Answer

Mechanics

A clean 'tax layer' in a DCF goes beyond a simple ETR. Two core formulas:

```
P&L tax = EBT × statutory tax rate ± permanent differences
Cash tax = (EBT + permanent differences − Δ temporary differences)
× statutory tax rate
```

Model these forecast items separately

PP&E component: ΔDTL from the depreciation difference (tax depreciation vs. book depreciation). Shrinks to 0 with stable capex.
NOL utilization: the DTA shrinks as it is used up.
Pension DTA: arises from the difference in the DBO discount rate between the financial-reporting books and the tax books.
Goodwill: in many jurisdictions not tax-deductible, so it produces no DTL effects.

Deep diveShow more details

Simplification in standard models

A single 'Δ deferred taxes' bulk line, estimated at 0.5–2% of forecast EBIT. Detailed DD models use a tax schedule with a statutory-to-ETR reconciliation and a separate PPA tax layer for M&A targets.

Pitch tip

For a DCF of a capex-intensive target, set the cash-tax rate at 22–24% over the first 5 years (vs. a 30% income-statement rate), converging to a long-run rate of 28–30%. This models the DTL buildup; equity-value effect +3–5%.

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