InvestmentCalculators
Tax & Planning

Tax & Planning Calculators

Two tools for the most common investor tax and planning questions — estimating capital gains liability on a realized trade, and tracking your overall financial position with a full asset and liability breakdown.

Know your tax bill.

Capital Gains Tax

Estimate federal short-term and long-term capital gains tax liability.

Your full financial picture.

Net Worth

Track total assets minus liabilities with a clear allocation breakdown.

Tax clarity for investors

Most retail tax surprises come from one of two oversights: misunderstanding holding-period rules (short-term vs long-term capital gains) or ignoring state tax on top of federal. The Capital Gains Tax Calculator addresses both. It uses the full IRS bracket structure by filing status — 0%/15%/20% for long-term gains, and ordinary income brackets (10 – 37%) for short-term gains — and layers the gain on top of your existing taxable income to find the progressive bracket correctly.

State capital gains tax is added on top of federal using a simplified top-marginal approach for each state. Nine states (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming) impose no state income tax. States like California (13.3%), Hawaii (11%), New Jersey (10.75%), and New York (10.9%) have the highest combined federal + state burdens. The calculator flags the effective rate so you can see the total tax bite on a specific gain.

The Net Worth Calculator zooms out to your full financial picture — total assets across cash, investments, retirement accounts, real estate, crypto, and other assets, minus total liabilities across mortgage, student loans, credit cards, auto loans, and other debts. Net worth is the single best metric for tracking financial progress because it captures the cumulative result of every income, saving, investing, and borrowing decision you make.

Both calculators are fully client-side. Your income, balances, and liabilities never leave your browser. No backend, no storage, no tracking.

Frequently asked

About tax & planning calculators

Does your capital gains calculator include the NIIT?
No, the Net Investment Income Tax (3.8% on investment income for high earners with MAGI over $200K single / $250K MFJ) is not included. If your income exceeds those thresholds, add 3.8% manually to the federal tax for a complete estimate. NIIT applies to capital gains, dividends, interest, rental income, and most other investment income.
How does the calculator handle short-term vs long-term gains?
Short-term capital gains (assets held less than a year) are taxed at ordinary income rates — 10%, 12%, 22%, 24%, 32%, 35%, or 37% depending on your bracket. Long-term gains (held a year or more) use the preferential 0%/15%/20% structure. The calculator stacks your gain on top of your existing taxable income and runs the full progressive math, so a partial gain can straddle multiple brackets.
What state-level nuances does the calculator miss?
A few states have specialized treatment for capital gains that a top-marginal rate approximation cannot capture: Washington has a 7% capital gains excise tax on gains above $250K but no general income tax; New Hampshire taxes dividends/interest specifically; some states (like Arkansas and Wisconsin) offer partial capital gains exclusions. For high-dollar events, consult a state-level tax professional.
Should I include my primary residence in net worth?
Yes, but be conservative with valuation and recognize the difference between 'total net worth' and 'investable net worth.' Total net worth includes home equity as an asset; investable net worth excludes it because home equity isn't liquid for spending. For retirement planning (FIRE, safe withdrawal rate), investable net worth is the more useful figure.
How do I value private business equity for net worth?
Conservatively. Use recent arm's-length valuation events if available (funding round, partner buyout, third-party offer). Otherwise use a conservative revenue or earnings multiple from comparable transactions. Avoid aspirational numbers. When in doubt, record book value (assets minus liabilities on the business's own balance sheet).
How often should I update my net worth?
Monthly is common for active accumulators; quarterly is fine for most others. Daily tracking can be counterproductive — normal market volatility generates noise that obscures underlying progress. Some investors use automated aggregators (Monarch Money, Empower, Copilot) that update continuously, and then do a manual review once a quarter.