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joellewis avatar

Time Value Of Money

joellewis/finance_skills
454 installs164 stars
Summary

This handles all the classic time value of money calculations: present and future value, NPV, IRR, loan amortization, annuities, perpetuities, and the Gordon growth model. It covers discrete and continuous compounding, so you can compare rates across different frequencies or build a proper mortgage amortization table. Use it when you need to discount cash flows, figure out what a stream of payments is worth today, or evaluate whether a project clears your hurdle rate. The formulas are solid and the examples walk through real mortgage and NPV scenarios with actual numbers. One thing to watch: it mentions a common pitfall about mismatching rate and period frequency but the text cuts off mid-sentence, so double check your own rate conversions.

Install to Claude Code

npx -y skills add joellewis/finance_skills --skill time-value-of-money --agent claude-code

Installs into .claude/skills of the current project.

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Files
SKILL.md

Select a file.

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Categories
Finance & Trading
First SeenJun 3, 2026
View on GitHub

More from joellewis/finance_skills

All 84 skills →
  • Performance Metrics453
  • Performance Reporting453
  • Diversification452
  • Emergency Fund450
  • Bet Sizing449
  • Return Calculations449
  • Anti Money Laundering447
  • Fund Vehicles447
  • Lending447
  • Know Your Customer446
  • Reconciliation446
  • Next Best Action445
  • Tax Efficiency444
  • Digital Assets443
  • Tax Loss Harvesting443
  • Fixed Income Corporate442
  • Forward Risk439
  • Investment Suitability439
  • Regulatory Reporting439
  • Settlement Clearing439
  • Client Onboarding438
  • Equities438
  • Exchange Connectivity438
  • Operational Risk437

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joellewis/finance_skills

Determine how much capital to allocate to individual positions within a portfolio. Use when the user asks about position sizing, the Kelly criterion, fractional Kelly, risk budgeting, or conviction weighting. Also trigger when users mention 'how much to put in one stock', 'maximum position size', 'how concentrated should my portfolio be', 'number of holdings', 'VaR budget per position', 'how big a bet', or ask about scaling position sizes with volatility.
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Analyze digital assets including cryptocurrency fundamentals, blockchain mechanics, DeFi protocols, and on-chain metrics. Use when the user asks about crypto investing, Bitcoin, Ethereum, staking yields, DeFi lending, impermanent loss, or on-chain valuation metrics. Also trigger when users mention 'blockchain', 'proof of stake', 'proof of work', 'smart contracts', 'NFTs', 'stablecoins', 'NVT ratio', 'TVL', 'crypto portfolio allocation', 'halving', or ask about risks and returns of cryptocurrency.
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operational-risk

joellewis/finance_skills

Guide identification, measurement, and management of operational risk in trading and brokerage operations. Use when designing trade error detection and correction procedures, investigating trade breaks and reconciliation failures, classifying loss events under Basel taxonomy, developing key risk indicators (KRIs) and dashboards, responding to system outages or data feed failures or order routing errors, conducting root cause analysis after a trade error or operational incident, planning business continuity and disaster recovery for trading desks, preparing for FINRA or SEC operational risk examinations, or assessing technology risk in OMS and market data systems. Also covers fat-finger errors, error account P&L, and corrective action tracking.
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order-management-advisor

joellewis/finance_skills

Manage the advisor trade lifecycle from order entry through settlement, covering block trading, allocation, pre-trade compliance, custodian routing, and error correction. Use when the user asks about designing an OMS for an RIA, executing model portfolio changes across many accounts, structuring block trades with fair allocation, configuring pre-trade compliance rules or restricted lists, routing orders to multiple custodians, handling trade errors or corrections, managing cash in trading workflows, or evaluating OMS platforms. Also trigger when users mention 'block trade', 'trade allocation', 'order management system', 'iRebal', 'Orion Trading', 'Tamarac Trading', 'best execution', 'trade error', 'mutual fund vs ETF orders', or 'audit trail'.
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savings-goals

joellewis/finance_skills

Plan and track savings for specific financial goals including retirement, education, and home purchase. Use when the user asks about required savings rates, 529 plans, retirement accumulation targets, down payment planning, or goal prioritization. Also trigger when users mention 'how much do I need to save each month', 'am I on track for retirement', 'college savings', 'safe withdrawal rate', '4% rule', 'FIRE savings rate', 'catch-up contributions', 'employer match', or ask how to balance competing savings goals.
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Guide margin lending, margin requirements, and margin call operations for brokerage and advisory accounts. Use when calculating Reg T initial margin or buying power, determining maintenance margin or house requirements, evaluating portfolio margin eligibility under OCC TIMS, generating or resolving margin calls (fed call, house call, exchange call, day-trade call), designing forced liquidation waterfall logic, structuring securities-backed lines of credit (SBLOC), computing margin interest impact on returns, assessing concentrated position margin, understanding pattern day trader rules, or reviewing FINRA 4210 and Reg U requirements. Also covers SMA calculations and short margin mechanics. For OTC derivatives margin (variation/initial margin, CSAs, SIMM) see counterparty-risk.
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