Idle cash calculator

Idle cash is money without a current purpose after allowing for bills, emergencies, taxes and planned expenses. A large balance alone does not mean you have too much cash. This planner estimates potential surplus only after your stated commitments and selected stress scenario are funded.

Start with household spending, dependable income, upcoming commitments and how long an income interruption could last. This planner starts with an editable six-month interruption; that is a scenario, not a universal recommendation. It reserves listed goals today and keeps one month of spending at month-end. Variable income, dependents or business commitments can justify more liquidity.

Consider accessible insured savings for emergencies. For a dated goal, compare CDs or Treasury bills with maturities that match when you need the money. Check withdrawal penalties, settlement time and the risk of selling before maturity. FDIC coverage is generally $250,000 per depositor, per insured bank, per ownership category. Money market mutual funds are investments, not FDIC-insured deposits.

After protecting liquidity, consider a diversified mix of investments appropriate to your goal, time horizon and ability to absorb losses. Five years is not a guarantee against loss. The planner illustrates an assumed return and an adverse path; it does not choose investments or estimate the probability of success.

Review an employer match and workplace retirement plan, an HSA if eligible, and IRA eligibility and deductibility before deciding on additional taxable investing. Limits, income restrictions and existing contributions matter. Workplace deferrals generally come from payroll; cash may support the household budget while deferrals increase. Enter only independently verified remaining capacity. The planner does not determine eligibility or evaluate backdoor Roth conversions.

Compare what you keep after taxes as well as access and risk. Bank interest is generally federally taxable. Direct Treasury interest is federally taxable but exempt from state and local income taxes; fund treatment requires separate verification. The planner uses your entered marginal rates and an additive approximation, not a tax return calculation. Missing tax inputs leave comparisons unavailable.

A home purchase, estimated taxes, uncertain employment, retirement spending or a business capital call can justify substantial cash. The purpose and timing matter more than salary alone. Model earlier payment dates, reduced income and extra reserve months before treating a balance as available to invest.

Compare the earnings from the current account with a suitable alternative after taxes and fees. For illustration, $50,000 earning 1% instead of 4% for one year earns $1,500 less before tax, assuming constant annual yields. These are hypothetical rates, not current offers. An investment return is uncertain and is not interchangeable with a savings yield.

At an assumed 5% annual compound return for 10 years, with no additions or withdrawals, those amounts become about $40,722, $81,445 and $162,889 respectively, before taxes, fees and inflation. This is arithmetic, not a forecast or a live rate. The interactive planner separately models your tax, fee and inflation assumptions and shows adverse scenarios.

Use it as a starting point for a decision, then verify account terms, coverage, contribution capacity and tax treatment before moving money. Revisit it when your goals or income change. Returns and stress assumptions are user-entered scenarios; no live product quotes are supplied. This free educational tool is not personalized investment or tax advice.