Total Cost of Ownership Beyond TER

The three layers, sized honestly

Layer 1: inside the fund (annual, recurring). Its complete measure is multi-year tracking difference: TER, withholding drag, securities-lending credit, sampling and turnover costs, all netted. Typical range for broad equity funds: −0.05% to −0.40% per year, with the variation across near-identical funds usually larger than their TER differences. This is why Chapter 35 crowned TD and why Layer 1 is measured, never estimated.

Layer 2: at the point of trade (one-off, per transaction). The round-trip toll: half-spread on entry plus half-spread on exit, plus commission, plus any FX conversion (0.1–0.5% each way at some brokers), plus whatever premium or discount you crossed. For a flagship fund traded mid-session this can be 0.05–0.10% round trip; for a niche fund at a bad hour, 1%+. Crucially, Layer 2 amortizes over your holding period: a 0.20% round trip costs 0.02%/yr if held ten years and 0.20%/yr if held one.

Layer 3: around the position (annual or per-contribution). Platform fees (flat or percentage), custody charges, savings-plan execution fees (0% to ~1.5% per purchase), wrapper costs (Chapter 29's cannibalization check), and taxes. For a €200/month saver, a 1.5% plan fee is 1.5% of every euro invested: an order of magnitude above any TER difference under discussion.

The arithmetic: one annualized figure

Combine the layers into an annualized total cost of ownership over your realistic holding period H (in years):

Taxes sit outside this formula for most comparisons, because they usually apply identically to two competing funds: except when they don't, which is exactly when they dominate: different domiciles (Chapter 50), different structures (Chapter 54), different wrapper eligibility (Chapter 29). Rule: include tax in the comparison whenever the two candidates differ structurally, exclude it when they don't.

Two worked applications of the formula show how conclusions flip:

Case A: €50,000 lump sum, held 15 years, flagship world funds. Fund 1: TD −0.08%, spread 0.04% round trip, free platform → TCO ≈ 0.08% + 0.003% = 0.083%/yr. Fund 2: TD −0.19%, spread 0.03% → 0.192%/yr. Layer 1 decides; the spread is rounding.

Case B: €150/month savings plan, 20 years, same two funds. Fund 1 is not plan-eligible at her broker: €1.50 per execution = 1.0% of each contribution ≈ ~0.35%/yr on the average balance over the period, added to 0.08% → ~0.43%. Fund 2 is plan-free → 0.192%. Layer 3 reverses the ranking entirely.

Same two funds, opposite answers, because the investor is different. This is why "which ETF is cheapest" has no answer without "for whom, held how, at which broker."

Where costs hide

Six recurring blind spots, each with its fix:

• FX conversion on foreign-currency listings: buy the home-currency line of the same ISIN (Chapters 7, 14).
• Savings-plan promo expiry: free lists rotate; calendar a yearly check (Chapter 16).
• Percentage platform fees on growing balances: a 0.35% platform fee is invisible at €5,000 and brutal at €300,000; flat-fee platforms cross over at some balance: know yours.
• Bid-ask on niche funds at bad hours: the awake-underlying rule (Chapter 12), worth more than any fee shopping.
• Wrapper fees exceeding wrapper benefits: Chapter 29's question 2, the European insurance-product trap.
• Turnover you cause: every rebalance, switch and "improvement" pays Layer 2 again. The cheapest portfolio is usually the one you leave alone (Chapter 63's low-touch methods).

The threshold that matters

A practical calibration, because cost analysis can become its own hobby: differences below roughly 0.05%/yr are noise against everything else in your plan (allocation, savings rate, behavior). Differences of 0.10–0.50%/yr are worth one afternoon of work, once, at setup. Differences above 0.50%/yr are usually structural (wrong wrapper, wrong domicile, expensive platform, active fund) and worth restructuring for.

Spending three weekends to save 3 basis points while holding an unwritten allocation policy is the classic misallocation of investor attention, and this chapter would rather you noticed that than optimized further.

A worked example

Tomas (Chapter 14's Vienna investor) audits his setup after four years.

• Layer 1: his All-World fund's five-year TD is −0.14% against −0.06% for a peer he'd dismissed as "more expensive" (TER 0.22% vs 0.20%). Potential saving: 0.08%/yr.
• Layer 2: he trades twice a year, mid-session, home-currency line: ~0.01%/yr amortized. Nothing to fix.
• Layer 3: his savings plan is free, but he discovers his broker began charging 0.15%/yr custody on balances above €50,000 last year: he crossed it. Cost: 0.15%/yr, larger than both fund differences combined.

His fix, in priority order set by the arithmetic rather than by habit: move brokers (0.15%), then switch fund on next contribution rather than by selling (0.08%, no Layer 2 cost, no tax event). Total improvement ~0.23%/yr, obtained by measuring the layers instead of the fee table.