savings-goals - SKILL.md Agent Skill

name: savings-goals description: "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."

Savings Goals

Core Concepts

Required Monthly Savings

To accumulate a future value FV in n periods at rate r per period:

PMT = FV × r / [(1+r)^n - 1]

This is the sinking fund formula (future value of annuity solved for PMT).

Inflation-Adjusted Targets

Always compute goals in future (nominal) dollars:

FV_nominal = FV_today × (1 + inflation)^years

Then solve for the required savings using the nominal return, or use the real return with today's dollars.

Education Funding

529 plans: tax-free growth for qualified education expenses, state tax deductions in many states
Current costs (2025-26, total cost of attendance, College Board Trends in College Pricing): ~$30K/year (public four-year in-state) to ~$65K/year (private nonprofit), growing ~5%/year
Front-loading: maximize early contributions for compound growth
Superfunding: 5-year gift tax averaging (contribute 5× annual exclusion at once)
Financial aid impact: parent-owned 529 assets are assessed at a maximum of 5.64% in the federal Student Aid Index (SAI) formula — FAFSA has used the SAI in place of the Expected Family Contribution (EFC) since the 2024-25 award year

Retirement Accumulation

Target nest egg: annual spending need / safe withdrawal rate
- Example: $80K/year spending / 0.04 = $2,000,000
Safe withdrawal rate: traditionally 4% (Bengen rule), adjusted for fees, taxes, longevity
Required savings rate: depends on starting age, current savings, expected returns
Employer match: always capture full match — it's an immediate 50-100% return
Catch-up contributions: additional 401(k)/IRA contributions allowed after age 50

Down Payment Saving

Typical target: 20% of home price (avoids PMI)
Timeline: typically 2-7 years → conservative allocation (HYSA, short-term bonds)
Include closing costs (2-5% of purchase price) in savings target

Goal Priority Framework

Recommended priority order:

Emergency fund (3-6 months expenses)
Employer 401(k) match (free money)
High-interest debt payoff (>6-8% rate)
HSA (triple tax advantage if eligible)
Max retirement accounts (401k, IRA, Roth)
Education funding (529)
Other goals (home, vacation, etc.)

Multiple Goal Balancing

Allocate savings across goals based on priority, timeline, and flexibility
Non-negotiable goals (retirement) take precedence over flexible goals
Shorter timelines need more conservative investment allocation
Use goal-based investing: separate sub-portfolios per goal with appropriate risk

Savings Rate Benchmarks

Minimum: 15% of gross income for retirement (including employer match)
Aggressive: 25-50%+ for early retirement / FIRE
Savings rate = total savings / gross income

Key Formulas

Formula	Expression	Use Case
Required savings (PMT)	PMT = FV × r / [(1+r)^n - 1]	Monthly savings for a goal
Future value with savings	FV = PV(1+r)^n + PMT×[(1+r)^n - 1]/r	Project goal balance
Inflation adjustment	FV_real = FV_today × (1+π)^t	Convert today's dollars to future
Retirement target	Nest egg = annual spend / SWR	Size the retirement goal
Years to goal	n = ln(FV×r/PMT + 1) / ln(1+r)	How long until goal is funded
Savings rate	SR = total savings / gross income	Track savings discipline

Worked Examples

Example 1: College Savings (529)

Given: Need $200,000 in 18 years, expect 7% annual return, starting from $0 Calculate: Required monthly savings Solution:

Monthly rate: r = 0.07/12 = 0.005833
Months: n = 18 × 12 = 216
PMT = $200,000 × 0.005833 / [(1.005833)^216 - 1]
PMT = $1,166.67 / [3.5125 - 1]
PMT = $1,166.67 / 2.5125 = $464.34/month

Example 2: Retirement Accumulation

Given: Age 30, $50,000 currently saved, wants $2,000,000 by age 65, expects 8% annual return Calculate: Required monthly savings Solution:

Monthly rate: r = 0.08/12 = 0.006667; months: n = 35 × 12 = 420
FV of current savings (monthly compounding): $50,000 × (1.006667)^420 = $50,000 × 16.2925 = $814,627
Remaining needed: $2,000,000 - $814,627 = $1,185,373
PMT = $1,185,373 × 0.006667 / [(1.006667)^420 - 1]
PMT = $7,902.49 / [16.2925 - 1]
PMT = $7,902.49 / 15.2925 = $517/month
With employer match of $200/mo: personal contribution = $317/month

Common Pitfalls

Not inflation-adjusting future goals (college in 18 years costs much more than today)
Neglecting employer match — it's the highest guaranteed return available
Too conservative allocation for long-horizon goals (20+ years can tolerate equity risk)
Saving for college before adequately funding retirement (retirement has no financial aid)
Not revisiting savings rate as income grows (lifestyle creep absorbs raises)
Using average returns without considering sequence risk near goal date

Cross-References

time-value-of-money (core plugin, Layer 0): FV/PV calculations, annuity formulas
emergency-fund (wealth-management plugin, Layer 6): must be funded before other goals
debt-management (wealth-management plugin, Layer 6): high-interest debt payoff competes with savings
tax-efficiency (wealth-management plugin, Layer 5): 529 tax benefits, Roth vs traditional, HSA
investment-policy (wealth-management plugin, Layer 5): goal-based allocation aligns with IPS constraints
asset-allocation (wealth-management plugin, Layer 4): glide paths for target-date retirement savings
finance-psychology (wealth-management plugin, Layer 7): mental accounting, present bias, commitment devices
financial-planning-workflow (advisory-practice plugin, Layer 10): savings goals are key inputs to the comprehensive financial planning process

Running the script

Run the reference implementation directly:

uv run scripts/savings_goals.py      # PEP 723 header resolves dependencies automatically
python3 scripts/savings_goals.py     # standard library only — no installs needed

A bare run prints a demo covering required monthly savings, retirement accumulation, time-to-goal, inflation adjustment, shortfall analysis, education funding, savings rate, and real returns. Use --verify to recompute the demo figures and assert they match this skill's worked examples (prints PASS/FAIL, exits nonzero on mismatch), and --help to list the available classes and functions. The file is primarily meant to be imported as a module (from savings_goals import SavingsGoals) rather than run standalone.