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Where the fees hide
Exchanges usually quote a maker/taker fee as a percentage of each trade’s value, and both legs of a round trip cost you: one fee when buying, another when selling. On a leveraged or high-frequency strategy those percentages compound into a serious drag, and spreads, withdrawal fees, and conversion charges can add more. Model your actual fee tier rather than the headline 0% marketing number.
A volatile market needs a wider lens
Crypto can deliver double-digit moves in a day, so a single buy-sell snapshot says little about a strategy. Consider what a 30% drawdown after your buy would do to the plan, whether you would hold or exit, and how taxes apply — in the US, each sale or swap is a taxable event just like a stock. Position sizing you can live with beats any projected return.
Contexto local: España
Datos locales clave para cálculos financieros en España — difieren de los valores estándar de EE. UU.:
- IVA: Tipo general 21 %, reducido 10 % (hostelería), superreducido 4 % (alimentos básicos). Los precios al consumidor lo incluyen.
- IRPF (2025): Tramos progresivos del 19 % al 47 % según la comunidad autónoma, con mínimo personal y familiar de 5.550 €.
- Cotizaciones: A cargo del trabajador ≈ 6,7 % del bruto (contingencias comunes 4,7 %, desempleo 1,55 %, formación 0,1 %, horas extra) más la retención de IRPF.
- SMI 2025: 1.184 € al mes en 14 pagas (16.576 €/año) — las pagas extra de julio y diciembre son habituales.
- Propina: Voluntaria; lo habitual es dejar un 5–10 % o redondear la cuenta.
Actualizado: octubre 2026 · valores de 2025, fuentes oficiales arriba.
Preguntas frecuentes
How are the fees calculated?
Each fee applies to that leg’s dollar value: the buy fee to the amount you paid, the sell fee to the amount you received. Enter 0 if your exchange charges no trading fees.
Can I enter fractions of a coin?
Yes — crypto trades in fractions, so 0.5, 0.021, or any decimal quantity works. The math scales the fees proportionally.
Do I owe tax on crypto gains?
In the US and most countries, yes: selling or spending crypto at a gain is a taxable event. Short-term gains usually follow income tax rates and long-term gains the capital gains schedule.