A few weeks ago we measured safe withdrawal rates across 50+ tactical strategies, and the fairest critique was that our data started in 1990. So we extended HAA's backtest to 1974, through the stagflation that nearly broke the 4% rule. The safe rate came down, and that makes it more believable.

European investors hit a wall the moment they try to run a US TAA strategy through IBKR: PRIIPs blocks AVUV, DBC, and most US-domiciled ETFs from retail purchase. The substitutes exist on XETRA and LSE, but they're not all equal. Some strategies translate cleanly (HAA, GEM, Permanent Portfolio). Others lose 50 to 100bps of CAGR per year through methodology drift on the small-cap-value sleeve. A few don't really translate at all. Here's the working playbook, split into three tiers.

We computed Bengen-style rolling 30-year safe withdrawal rates for 80 variants across 51 published TAA strategies. Every single one clears 4%. The best unleveraged TAA strategies (VAA-G4 SmartStack 15.3%, HAA SmartStack 14.2%) sustain real withdrawal rates 3-4x higher than Classic 60/40. Why TAA defeats sequence-of-returns risk, and four honest reasons you should still anchor your retirement plan closer to 4% than 15%.