One life. Many versions of it.

Money is full of what-ifs.See where yours could lead.

Financial planning software for the life you want to explore. Compare retirement dates, follow your cash flow and net worth, and see how today’s choices could shape your future.

  • Free, yet super powerful
Example household

What if I retire next year?

See what an earlier finish line asks of your savings today.

the change$4.4M$0.9M30405060708090
Last day of work
62 → 55
Money lasts to
97 → 88
Left at 90
$0.9M
The workspaceCash flow · Lifetime net worth · Financial wellness · Estate
MoneyWhatIf forecast views showing cash flow, net worth, plan health, and lifetime financial choices

The people behind MoneyWhatIf

Rooted in research.
Built with experience.

Research team

With backgrounds at

  • HarvardUniversity
  • ColumbiaUniversity
  • Johns HopkinsUniversity

Engineering team

With experience at

  • Google
  • Bloomberg
  • Amazon

How the pieces fit together

Your numbers become
a picture you can explore.

MoneyWhatIf brings current finances, future choices, and the details behind the forecast into one connected planning process.

  1. Bring the starting numbers together

    Describe your household, income, everyday spending, property, debts, and investment accounts. Add retirement dates and the assumptions you want to explore. You can begin with estimates and refine the entries as your picture becomes clearer.

  2. Give a possible change its own path

    Try a different retirement date, a new home, a career break, or another saving rate. What-If keeps the original forecast in view while the change flows through the plan’s income, taxes, spending, and future balances.

  3. Understand the years behind the answer

    Open a year to trace its money flow, review the tax picture, and see which accounts fund spending. Use historical simulations to explore market uncertainty, then keep the choices you want to revisit and share the plan for a conversation.

Inside the forecast

One plan. Many ways to understand it.

Start with the lifetime picture, open the years that matter, and keep following the same numbers through resilience, wellness, and legacy.

Lifetime projection

See the whole plan, year by year.

Trace your whole lifetime of net worth in one view, then choose any year to see the income, taxes, spending, property, and accounts behind it.

Explore lifetime projection
A lifetime net worth projection with stacked account balances, life-event markers, and a selected-year financial breakdown

Cash flow

Follow cash through every year—and every dollar.

Watch inflows and outflows change across your lifetime, then open any year to trace each income source into taxes, housing, investing, and cash kept on hand.

Explore cash flow
A selected-year money-flow diagram tracing salaries and other income into taxes, housing costs, investments, and cash beside the full annual ledger
A lifetime cash-flow chart with positive and negative bars beside a detailed breakdown of money in, money out, net worth, and real estate

Financial wellness

Read the plan as a scorecard.

Turn a dense forecast into direct answers: when work becomes optional, whether retirement savings meet the need, how long cash lasts, and what deserves attention.

Explore financial wellness
A financial wellness scorecard with status filters and cards for savings, retirement readiness, withdrawal rate, Medicare surcharges, and other plan metrics

Historical stress test

Put your plan through markets that actually happened.

Reshuffle real market history into hundreds of lifetime sequences. See the range of outcomes, inspect the leanest run, and learn what the headline odds are made of.

Explore historical stress test
A historical market stress test showing 300 runs, a range of lifetime outcomes, and detailed lean, middle, and fortunate sequences

Estate flow

Follow what is left, and where it goes.

See how each account reaches beneficiaries, taxes, property liquidation, and administration costs. The plan stays connected all the way through the estate.

Explore estate flow
An estate Sankey diagram tracing a gross estate to beneficiaries, taxes, property liquidation, and administration costs above an interactive estate calculator

Private sharing

Share the plan with the people who matter.

Invite a partner or loved one to a read-only view, or send a link when that is simpler. You decide who can see the plan; they can read it, never change it.

Explore private sharing
A plan-sharing dialog with options for restricted access, link access, and inviting specific people as read-only viewers

Start with what matters to you

Different questions.
One connected plan.

Choose a place to begin. Each feature introduction explains the workflow, shows the product in action, and walks through a practical example.

Keep exploring

There’s more to your financial picture.

Retirement, tax strategies, property, historical markets, and the tools that connect them.

Explore all features

Before your first what-if

Get to know
your planning space.

A few practical answers about getting started, keeping your numbers current, and understanding what the forecast can tell you.

What should I have ready to build a forecast?

Start with household ages, annual income and spending, account balances, property values, and amounts owed. Retirement dates, future purchases, contributions, and other changes give the forecast its timeline. The guided setup organizes the inputs, and individual entries stay editable as your assumptions develop.

See how a plan starts
Can I explore the product before entering my own numbers?

Yes. The public example plans use invented households at different life stages. Open one to explore its projection, tax picture, reports, and other views. What-If in an example lets you investigate changes before starting with your own household.

Explore example plans
How do current finances and alternative plans fit together?

A profile keeps a household’s current finances and dated history together. Its plans describe possible futures, with their own retirement dates, contributions, growth assumptions, and other choices. Plans can use the shared household figures as their starting point while retaining their own adjusted entries where needed.

See how comparisons work
How should I interpret a forecast or success rate?

The baseline shows what follows from the assumptions you choose. Historical market tools show how the plan behaves across selected or rearranged past returns. Both are modeled scenarios. Review the difficult years, costs, and assumptions behind the result, rather than relying on one ending balance or percentage.

Read the methodology
Who can see the plans I save?

Sharing is controlled by the saved access settings. An individual plan can stay Restricted with named viewers or allow anyone with its link to read it. Profile sharing grants named people broader access to the household’s finances and plans, with view or edit roles. Choose the scope that fits the conversation.

Understand sharing controls

Your turn

Bring your own what-if.

Build your forecast