The Wealth Wingwoman Audit
Audited by Valerie Vance"The clash between flatex and Scalable Capital is a duel between two distinct generations of German-speaking wealth building: the seasoned, independent flat-fee execution house versus Munich’s venture-backed neobroker titan that popularized the modern subscription trading model. Both desks eliminate the primary bureaucratic nightmare of German and Austrian retail investing: both are fully steuereinfach—automatically withholding domestic capital gains taxes (25% German Abgeltungsteuer or 27.5% Austrian KESt), tracking your tax-free allowance (Freistellungsauftrag), netting loss pots (Verlusttöpfe), and calculating the advance lump sum (Vorabpauschale) on accumulating ETFs so you never have to file an Anlage KAP. Assuming they offer an identical service because both automate domestic taxes is an expensive mistake. flatex—operating under flatexDEGIRO Bank AG—is an independent flat-rate execution desk built for transparent, volume-agnostic trading, broad exchange access, and securities-backed Lombard lending. Scalable Capital—backed by BlackRock and Tencent—is an agile fintech platform engineered around automated wealth accumulation: delivering €0 ETF savings plans from just €1, a €0.99-to-flat-rate Prime+ trading model, a 2.60% interest rate on uninvested cash, and a dedicated Junior account setup. Let’s look at the engine block to see where your capital actually compounds with the highest operational efficiency."
The Tale of the Tape
flatex is the domestic discount execution house of flatexDEGIRO Bank AG. Tailored strictly to German and Austrian wealth accumulators, flatex combines statutory German banking deposit protection (EdB up to €100,000) with unconditional domestic tax compliance. It avoids retail consumer banking bloat to focus on an independent, flat-rate trading desk: delivering a flat €7.90 discrete order ticket on standard electronic venues, thousands of automated €0 ETF savings plans, and an integrated securities-backed Lombard line (flatex flex-Kredit).
Scalable Capital is Munich’s dominant neobroker and wealth platform, supervising billions in client assets. Regulated by BaFin and the European Central Bank, Scalable operates using partner bank custody alongside its own expanding banking infrastructure. It features a tiered model: the Free Broker (€0.99 per trade) and Prime+ (€4.99/month flat rate), paired with competitive interest on uninvested cash, fractional savings plans from €1, and its Scalable Kids custody accounts.
The Fine Print Reality Check
Both brokers automate your tax compliance, so the real financial battle is fought over order ticket scaling, savings plan flexibility, cash yields, exchange routing, and family wealth rails.
- The Order Ticket Economics (€7.90 Flat vs. €0.99 / €4.99 Flatrate): Scalable Capital (Free Broker) charges €0.99 per trade on gettex/EIX. Even better: purchases of PRIME ETFs (Amundi, iShares, Vanguard, Xtrackers) of €250 or more are completely €0. If you upgrade to Prime+ (€4.99/month), all trades of €250+ on gettex become €0 flat. Trading on Xetra is available for €3.99 + 0.01%. flatex charges a flat €5.90 base fee + €2.00 third-party flat fee = €7.90 total on standard electronic venues, regardless of trade size. On a €1,000 discrete purchase of an iShares ETF, Scalable executes the order for €0.00 to €0.99, while flatex charges €7.90.
- Savings Plan Thresholds & Stock Plan Drag (€1 vs. €25 & 1.00% Stock Fees): Both brokers offer €0 execution fees on broad-market ETF savings plans. Scalable Capital lets you automate savings plans from just €1 per execution across 2,400+ ETFs and 7,500+ individual stocks—with €0 execution fees on both ETF and stock savings plans. Fractional shares are supported natively. flatex enforces a €25 per month minimum per savings plan. While ETF savings plans are €0, flatex levies a 1.00% execution fee on stock savings plans. If you dollar-cost average €500 a month across individual equities on flatex, you lose €5 every month (€60/year) to execution fees.
- Cash Yields on Uninvested Capital (2.60% Yield vs. 0% Drag): Scalable Capital pays a competitive 2.60% p.a. (variable) interest rate on uninvested cash held in its Overnight account on both Free and Prime+ tiers. Interest is paid out monthly, allowing dry powder to compound while waiting for market pullbacks. flatex pays 0% interest on uninvested clearing account balances (Verrechnungskonto). Leaving €30,000 in cash on flatex costs you roughly €780 a year in lost interest compared to Scalable.
- The Family Wealth Moat (Scalable Kids vs. Adult-Only flatex): Scalable Capital offers Scalable Kids (Junior accounts) opened directly in the minor child’s name. This allows parents to allocate assets to their children to take full legal advantage of the child's independent basic tax allowance (Grundfreibetrag exceeding €11,000/year in Germany) plus their €1,000 Sparer-Pauschbetrag, legally shielding capital gains and distributions from household income taxes. flatex is designed exclusively for adults (18+); it offers no junior custody depots or minor accounts.
- Exchange Connectivity & Execution Depth (Tradegate/Regional vs. gettex-Centric): flatex connects to a broader institutional exchange network: Tradegate, Lang & Schwarz, gettex, Xetra, German regional floor exchanges, and foreign bourses. For illiquid small-caps or bonds, flatex gives you deeper venue choice. Scalable Capital concentrates order flow primarily through gettex (Börse München) and EIX (European Investor Exchange). While spreads on gettex match Xetra during regular market hours, off-market spreads can widen on less liquid counters.
- Lombard Lines & Credit Flexibility (flex-Kredit vs. Scalable Credit): flatex provides an established, flexible securities-backed credit line (flatex flex-Kredit) tied directly to your depot collateral, making liquidity draws seamless without liquidating long-term positions. Scalable Capital offers Credit at tiered variable rates, but qualification is subject to stricter automated underwriting and portfolio balance thresholds.
The Fine Print Translation
Scalable Capital is an automated wealth-compounding machine: offering €0.99 trades (or €0 on Prime ETFs), €0 savings plans from €1 on both stocks and ETFs, a 2.60% interest rate on uninvested cash, and Junior accounts. flatex is a classic flat-fee execution desk: offering broad exchange routing and an established Lombard line, but charging €7.90 on discrete trades, 1.00% on stock savings plans, 0% on uninvested cash, and zero junior depots.
The Daily Driver Test
Your platform experience depends entirely on whether you want an automated, mobile-first fintech cockpit or an established multi-exchange trading desk.
Scalable Capital feels like an agile wealth hub. Available via a sleek mobile app or modern web portal, setting up automated recurring index investments takes thirty seconds. Fractional shares ensure every cent from your monthly allocation is put to work immediately. Switching between your primary investment depot, your Scalable Kids account, and your interest-bearing Overnight cash balance happens in a couple of taps. Setting price alerts, tracking portfolio performance dynamically, and executing limit orders is clean and visual.
flatex feels like an institutional trading terminal. The flatex next mobile app provides clean order execution, while the comprehensive flatex WebFiliale desktop portal gives you access to full order book depth, direct exchange selection (Tradegate, Xetra, regional bourses), and real-time collateral monitoring for your flex-Kredit line. However, the interface carries more legacy banking friction, discrete orders cost €7.90 across the board, and navigating manual corporate actions requires more administrative patience.
The Wingwoman Allocation
Don’t pay €7.90 per order out of habit, and don’t sacrifice exchange choice if you trade niche assets. Allocate your capital based on your trade sizing, cash management, and family structure:
- Deploy with Scalable Capital if: You build wealth through automated monthly savings plans, taking advantage of €0 execution on both ETFs and individual stocks from just €1. You execute discrete orders on core index ETFs or stocks, capturing €0.99 trades on Free Broker or €0 trades on Prime+ and Prime ETFs (beating flatex’s €7.90 ticket by €7+ every trade). You hold uninvested dry powder or emergency reserves and want an automatic 2.60% p.a. interest yield inside your Overnight account. You are investing for your children and want a Scalable Kids (Junior account) to legally harvest their annual Grundfreibetrag and Sparer-Pauschbetrag. You want a modern, mobile-first app with fractional share execution.
- Deploy with flatex if: You execute large lump-sum discrete trades (€10,000 to €50,000+) and demand direct exchange routing through Tradegate or regional German bourses without being funneled into gettex. You actively utilize a securities-backed credit line (flatex flex-Kredit) for short-term liquidity management against your portfolio collateral. You value an independent, established discount bank structure under flatexDEGIRO Bank AG that avoids third-party custodian bank models. You trade complex OTC leveraged certificates and knock-out warrants via flatex’s Premium Partner desks.
Your Wingwoman Move
For modern, long-term wealth builders in Germany and Austria, Scalable Capital is structurally and mathematically superior. You eliminate flatex’s €7.90 discrete order toll, gain access to €0 stock savings plans starting from €1, earn 2.60% interest on uninvested dry powder, and unlock Scalable Kids for tax-advantaged family compounding—all while retaining 100% automated domestic tax reporting (steuereinfach).
Reserve flatex strictly if your playbook requires Tradegate order book depth on illiquid equities or immediate access to a flex-Kredit Lombard line. For pure index compounding and everyday portfolio growth, let the neobroker carry the load. Go get paid.