Evaluation & Sample Scenarios

A planning engine you can actually see into

NestVida is a privacy-focused, browser-native planning engine. It simulates the parts of retirement that usually sit behind a paywall — multi-bracket tax forecasting, Medicare IRMAA surcharges, and Roth-conversion optimization — while your financial inputs never leave your device.

Sample scenarios & outcome projections

Three distinct planning profiles, simulated in NestVida and set beside the kind of results common commercial planners produce for similar inputs.

Illustrative estimates — not measured head-to-head test runs. The comparison ranges below are typical figures for tools in each category, not the output of running identical inputs through named products. NestVida figures are produced by the live engine.

Scenario A

Early FI / FIRE

Profile: Age 42, single
Assets: $1.5M pre-tax / taxable
Retire: Age 48
Spend: $6,000 / mo

68%

NestVida success rate

Subscription planner~65–70%

Aggregator-based tool~72%

Primary risk: pre-Medicare healthcare costs over a long horizon.

Scenario B

Traditional married couple

Profile: Married 55 / 53
Assets: $1.2M 401(k), $200k Roth
Retire: Age 65
Spend: $8,500 / mo

84%

NestVida success rate

Subscription planner~85%

Aggregator-based tool~82%

Primary risk: sequence-of-returns risk in the years before Social Security starts.

Scenario C

High net worth / RMD-heavy

Profile: Married 62 / 60
Assets: $3.5M pre-tax, pensions
Retire: Age 65
Spend: $15,000 / mo

92%

NestVida success rate

Subscription planner~90–94%

Aggregator-based tool~95%

Primary risk: tax drag from required minimum distributions starting at age 75.

Feature parity & readiness checkpoints

NestVida models tax rates, bracket creep, and the sequence of withdrawals with high fidelity for standard deterministic plans, and its Monte Carlo survival probability tracks closely with mainstream engines. Federal and state tax, the standard-vs-itemized deduction shift, and Medicare IRMAA step-downs are built in — features often reserved for paid tiers elsewhere.

NestVida (client-side)

✓ Basic cash flow & net worth
✓ Social Security / pension stagger
✓ Roth conversion laddering
✓ Medicare IRMAA surcharge tracking
⚠ Long-term care expense injection

Commercial tools (typical)

✓ Automated account syncing
✓ Multi-bracket tax modeling
✓ Estate planning & legacy goals
✓ Custom inflation assumptions
✓ Long-term care & special events

An honest review

Strengths

Zero data footprint. Everything runs in your browser — no aggregators (Plaid/Yodlee), no stored login tokens, no financial data leaving your device.
Instant recalculation. Move a slider — spending, retirement age, market return — and tax brackets, RMDs, and success rates update live, with no network round-trip.
Advisor-grade tax & Roth logic. Conversion insights that usually require a paid platform come standard.
Transparent by design. The engine uses published 2026 figures you can inspect — no black-box "score."

Limitations

Manual input overhead. No live account linking — you enter balances yourself and update them over time.
Simplified asset volatility. Monte Carlo captures general market distribution but is less granular than holdings-level equity/bond/alternative analysis.
One scenario at a time. The focus is a single, deeply-modeled plan rather than a library of saved side-by-side scenarios.

The verdict

If you want advisor-grade tax and Roth modeling without handing your financial life to an aggregator, NestVida punches well above its price. Bring your own numbers, and in return you get a fast, private, transparent engine that shows its work. It is a planning instrument, not an account dashboard — and for the people who want exactly that, it is hard to beat.