Free crypto calculators for profit, taxes, staking rewards, DCA backtesting and retirement planning. Every crypto money question answered with a number, not an article.https://cryptosums.com/en-ushttps://cryptosums.com/guides/bitcoin-401k-executive-order/https://cryptosums.com/guides/bitcoin-401k-executive-order/The August 2025 executive order didn't put Bitcoin in your 401(k) — it changed who gets blamed if your plan offers it. What savers can actually do now.Sat, 11 Jul 2026 00:00:00 GMThttps://cryptosums.com/guides/crypto-cost-basis-explained/https://cryptosums.com/guides/crypto-cost-basis-explained/Same trades, three basis methods, three different tax bills. How FIFO, LIFO and HIFO work, one worked example across all three, and who may use what.Sat, 11 Jul 2026 00:00:00 GMThttps://cryptosums.com/guides/how-much-bitcoin-to-retire/https://cryptosums.com/guides/how-much-bitcoin-to-retire/A four-step framework for the 'BTC number': spending target, withdrawal rate, price scenarios and sequence risk — with the honest error bars attached.Sat, 11 Jul 2026 00:00:00 GMThttps://cryptosums.com/guides/dca-vs-lump-sum-crypto/https://cryptosums.com/guides/dca-vs-lump-sum-crypto/We backtested monthly DCA against lump-sum buying across five Bitcoin market regimes since 2015. Neither always wins — here's exactly when each does.Sat, 11 Jul 2026 00:00:00 GMThttps://cryptosums.com/guides/how-staking-rewards-are-taxed/https://cryptosums.com/guides/how-staking-rewards-are-taxed/Staking rewards are usually taxed twice — as income when received, then capital gains when sold. Country-by-country rules, with worked examples.Sat, 11 Jul 2026 00:00:00 GMThttps://cryptosums.com/guides/where-stablecoin-yields-come-from/https://cryptosums.com/guides/where-stablecoin-yields-come-from/Every stablecoin yield is payment for a risk someone chose not to hold. The four real sources — T-bills, lending, funding capture, subsidies — and the red-flag checklist.Sat, 11 Jul 2026 00:00:00 GMT