Most retirement planners give you a single projection at a fixed return rate. Enter your numbers, get a line chart, done.
That misses two things that matter most for early retirees: what happens when returns are randomized across hundreds of scenarios, and what happens when you want to compare two different versions of your plan. Today we're shipping the BridgeToRetired online planner for Pro members — with scenario saving, Monte Carlo simulation, and contextual guidance on every input.
Why We Built This
The Excel planner we shipped with Pro v3 is powerful. But it has a fundamental limitation: it lives on your computer. You download it once, enter your numbers, and that's it. There's no reason to come back. No cloud save. No comparison between scenarios.
That's a problem for two reasons.
First, early retirement planning is not a one-time exercise. You revisit it when markets move, when spending assumptions change, when a partner's income situation changes, when you get a new SS estimate. A file on your desktop doesn't support that.
Second, the most useful thing a retirement planner can do is let you compare two versions of your plan — "Retire at 52 with $40K spending" vs "Retire at 55 with $45K spending." The Excel file can't do that without opening two copies and manually comparing.
The online planner fixes both.
Free Excel vs Pro Excel vs Online Planner
What the Online Planner Does
Scenario saving — the core feature
Every plan you build can be named and saved. Up to 5 scenarios per account. They live in the cloud and reload instantly when you click them in the sidebar.
The names are yours to set — "Retire at 52 aggressive," "Retire at 55 conservative," "What if we move to Texas," "Part-time income bridge." When you load a saved scenario, every input repopulates and all results recalculate immediately. No re-entering numbers.
Auto-calculation
Change any input and results update automatically. Change your retirement age from 55 to 52 and watch the Monte Carlo success rate drop in real time. Change your spending from $50K to $40K and watch it recover. This is the right way to build intuition about your plan — not by reading numbers, but by watching them change as you adjust assumptions.
Why Monte Carlo matters more than a fixed-return projection
A fixed-return projection assumes you get 6.5% every single year. That never happens. Some years are +20%, some are -30%, and the order matters enormously.
If the bad years come first — right after you retire — you are selling assets at the bottom to fund spending. That damage compounds and never fully recovers. A fixed-return projection misses this entirely because it assumes returns arrive in a smooth, predictable order.
Monte Carlo runs 200 randomized return sequences, each with a different order of good and bad years. The success rate is how many of those 200 sequences end with money still in the portfolio. For early retirees with 35-40 year horizons, this is one of the most important numbers to know — because sequence risk is highest at the start of a long retirement.
Benchmarks: 90%+ is robust. 75-90% is acceptable with spending flexibility. Below 75% means the plan needs structural changes before retiring.
9 risk flags — live
The Risk Flags tab runs 9 automated checks and updates every time inputs change: withdrawal rate, bridge gap, 401k penalty risk, cash buffer, ACA cliff exposure, SS delay opportunity, IRMAA trigger, portfolio survival to life expectancy, and Monte Carlo success. Each flag is color-coded and includes a plain-English explanation with what to change.
Contextual help on every input
Click any input field and a help card slides in below it with three parts: what the field is, why it matters for early retirees, and a concrete example. The SS benefit field warns that early retirement leaves zeros in the 35-year calculation. The taxable brokerage field explains why it's the most important number for bridge funding. The volatility field explains standard deviation in plain English.
A Real Example — 21% to 94% Monte Carlo
Here is what the planner showed on a scenario that looked fine until Monte Carlo ran.
The inputs: Age 49, retiring at 52. $515K in a 401k, $9K Roth, $150K cash. $50K annual spending. NY, MFJ, SS at 62.
The deterministic result: Portfolio shows a positive balance at 90. Looks okay.
What the planner actually showed:
Withdrawal rate: 7.4% — flagged immediately as high risk for a 37-year horizon.
Bridge tab: cash covers years 1-3, then the 401k starts getting drawn before 59½ — triggering $281K in penalty-risk withdrawals.
Monte Carlo: 21% success rate. 79% of simulated retirement sequences end in portfolio depletion before 90.
Risk Flags: 5 of 9 flags firing — HIGH withdrawal rate, GAP in bridge funding, PENALTY RISK on 401k draws, CONSIDER 70 for SS delay, DEPLETED in deterministic projection.
After adjustments: Changing retirement age to 55, spending to $44K, and SS claiming age to 70 moved Monte Carlo from 21% to 94%. All 9 flags green. $5M projected at 90.
The planner did not make those decisions. It showed clearly what was wrong and let the numbers respond to each change in real time.
How the Online Planner and Excel Planner Work Together
Both are included with Pro. They serve different purposes.
The online planner is for active planning — building scenarios, comparing options, revisiting assumptions as life changes. Use it regularly.
The Excel planner is the offline companion — the 9-sheet system with TAX ESTIMATE and ROTH LADDER that goes deeper than the web version currently covers. Use it when you want to model the tax and Roth conversion details of a specific scenario you've already shaped online.
TAX ESTIMATE and ROTH LADDER are on the roadmap for the online planner. Until then, the workflow is: find the right scenario structure online, then take it into the Excel planner for deeper modeling.
What's Coming Next
- TAX ESTIMATE tab — federal tax estimate for every bridge year, switchable MFJ/Single brackets
- ROTH LADDER tab — suggested conversions with ACA cliff cross-check per year
- Scenario comparison view — two scenarios side by side, key metrics compared
- PDF export — one-click export for advisor meetings
How to Access It
The online planner is at bridgetoretired.com/pro/planner — Pro members can access it immediately after logging in.
If you are on the free plan, the planner shows a locked preview. The free Bridge Planner v2.2 remains available for download with SS income modeling, bridge cascade, and 5 risk flags.
Pro — Online Planner + Excel v3 — $9/month Save 5 scenarios, Monte Carlo simulation, 9 risk flags, full 9-sheet Excel system, contextual input guidance. Start Pro →
Free — Bridge Planner v2.2 7-sheet Excel with SS modeled, bridge cascade, 5 risk flags. Download free →
Related: Bridge Planner Pro v3 — What's New · How to Use the Bridge Planner · Can I Retire at 50 With $1M? · Roth Ladder vs 72(t)