Hebous & Ruf (2017): ACE Systems, Multinational Debt Financing and Investment

Summary

Hebous and Ruf, "Evaluating the effects of ACE systems on multinational debt financing and investment" (Journal of Public Economics 156, 2017, 131–149), is the most credibly identified empirical study of the allowance for corporate equity — the corporate tax design that exempts the normal return and taxes only economic rent. Using administrative data covering virtually all German-based multinationals (with synthetic-control methods and within-multinational variation across affiliates in ACE and non-ACE countries), the authors test what ACE adoption actually changed.[1]

Findings

1. Debt ratios fell at affiliates in ACE countries, as the design predicts — the equity allowance removes the tax subsidy to leverage. The paper's regressions find "an ACE reduces the total debt ratio in ACE countries by about 3 to 5 percentage points on average" — ~3.5pp in the baseline specification, and ~5pp for "hard" (full-stock) ACE regimes such as Belgium's, versus ~2.5pp for "soft" (incremental) versions (verified against the working-paper text this session).
2. Passive investment rose; real investment did not. ACE regimes increased intra-group lending and passive financial positions of affiliates, but had no detectable effect on production (real) investment.[1]
3. The "double dip." A unilateral ACE invites a tax-planning structure: push equity into the ACE country (earning a notional deduction there), then on-lend within the group (earning interest deductions elsewhere). The design's neutrality logic holds in a closed economy; in an open one it creates a new shifting margin unless internationally coordinated or destination-based.[1]

Why This Matters for the Geoist Case

This is the file's central cautionary result for rent-targeting corporate taxation: a base that is rent-only by construction delivered its financing-neutrality promise but not (for multinationals) its real-investment promise, because mobile firms arbitraged the unilateral design. It does not show rent taxation is wrong — it shows instrument design and international coordination carry the burden, exactly as the destination-based variants (DBACE, DBCFT) argue. Set against it, Konings, Lecocq & Merlevede (2022) find positive affiliate employment and investment effects of Belgium's ACE — different sample (affiliates located in Belgium vs. German multinationals' affiliates), and a genuinely open dispute the wiki carries on the ACE page.

See Also

• Allowance for Corporate Equity — the instrument evaluated
• Cash-Flow Tax — the destination-based fix this finding motivates
• Branzoli & Caiumi (2020) — the incremental-design evidence
• Corporate profits increasingly reflect economic rents

Sources

1. Shafik Hebous & Martin Ruf (2017), "Evaluating the effects of ACE systems on multinational debt financing and investment," Journal of Public Economics 156, 131–149 (working-paper version: Victoria Univ. of Wellington/CESifo, Jan. 2017) — used for all findings above; debt-ratio magnitudes (3–5pp; 3.5pp baseline, ~5pp hard-ACE) verified against the working-paper text this session. DOI · SSRN