Coast FIRE Bridge Years Calculator

Coast FIRE Bridge Years Calculator

Model the gap between reducing work and receiving pension, Social Security or retirement-account income. See each year's shortfall, withdrawal requirement and whether accessible assets last the distance.

Year-by-year cash-flow waterfallMultiple income start datesAccessible-asset depletion warnings
Mode ABridge fully funded

Starting Accessible Assets

$350,000

Bridge Ending Reserve

$1,143,093

Bridge Years

18

Total Withdrawals

$773,902

First Uncovered

None

Depletion Age

None

Timeline

The last year of the cash-flow analysis — usually after major benefits begin.

When full employment income first decreases.

When employment income stops entirely.

Bridge Spending

$

Enter in today's dollars.

%

Applied each year of the bridge.

Employment Income

Gross

Enter gross annual income. This calculator does not calculate personal income taxes.

$
$
%

Retirement Income Sources

Each source is counted only from its entered start age. Amounts are user-entered planning estimates.

$
%
$
%

Accessible Asset Buckets

Each bucket is used only after its entered access age. Access age is a user-entered planning assumption — not a legal or tax determination.

$
Available now
%
%

1 = withdrawn first. Not tax or investment advice.

$
Available now
%
%

1 = withdrawn first. Not tax or investment advice.

$
Restricted until age 59½
%
%

1 = withdrawn first. Not tax or investment advice.

Bridge Milestone Timeline

Income and asset milestones in sequence

Age 55

Work Reduces

Income decreases

Age 58

Full Work Exit

Employment ends

Age 60

Pension Begins

Monthly benefit starts

Age 67

Social Security

Benefit begins

Age 67

Bridge Ends

Analysis complete

Annual Cash-Flow Waterfall

How spending is covered this year

Annual Spending$60,000

− Income Available This Year

Employment income−$120,000
Portfolio Withdrawal Required$0

→ Withdrawn from Assets

Total withdrawn$0
Annual Surplus$60,000

Opening Assets

$350,000

Growth

$17,864

Closing Assets

$427,864

Year-by-Year Annual Draw Table

Full cash-flow for every bridge year

AgeYearSpendingTotal IncomeGapWithdrawalClosing AssetsStatus
50🔓2026$60,000$120,000-$60,000$0$427,864Funded
512027$61,800$122,400-$60,600$0$507,338Funded
522028$63,654$124,848-$61,194$0$588,474Funded
532029$65,564$127,345-$61,781$0$671,328Funded
542030$67,531$129,892-$62,361$0$755,956Funded
552031$69,556$40,000$29,556$29,556$749,931Funded
562032$71,643$40,800$30,843$30,843$743,955Funded
572033$73,792$41,616$32,176$32,176$738,061Funded
582034$76,006$0$76,006$76,006$689,832Funded
592035$78,286$0$78,286$78,286$640,905Funded
602036$80,635$20,000$60,635$60,635$1,143,611Funded
612037$83,054$20,000$63,054$63,054$1,146,704Funded
622038$85,546$20,000$65,546$65,546$1,147,572Funded
632039$88,112$20,000$68,112$68,112$1,146,024Funded
642040$90,755$20,000$70,755$70,755$1,141,854Funded
652041$93,478$20,000$73,478$73,478$1,134,844Funded
662042$96,282$20,000$76,282$76,282$1,124,761Funded
672043$99,171$50,000$49,171$49,171$1,143,093Funded
The Bridge in Sequence

Work Reduces → Assets Fill the Gap → New Income Begins

The bridge is not a single event. It is a sequence of transitions that each change the size of the annual spending gap.

01

Work Reduces

Full employment income falls to part-time, consulting or a reduced role.

02

Employment Income Ends

Employment income stops entirely, increasing the annual spending gap.

03

Accessible Assets Fill the Gap

Cash, taxable brokerage and unlocked accounts fund the remaining shortfall.

04

New Income Sources Begin

Pension, Social Security or annuity payments reduce the annual drawdown.

05

Bridge Period Ends

The last modeled income source begins. The bridge analysis is complete.

The Math Behind Each Bridge Year

How the Year-by-Year Cash Flow Is Modeled

Annual Shortfall Formula

Gap = (Spending × (1 + Inflation)Y) − Available Income

This remaining gap must be funded by withdrawing from accessible assets. Any remaining asset balance then grows by its net return.

1
Inflation-Adjusted Spending
Annual spending rises by the entered rate
2
− Available Income That Year
Counted only from its entered start age
3
= Annual Cash-Flow Gap
Shortfall that must be funded from assets
4
− Withdrawals from Assets
Assets used only after their access age
5
= Uncovered Shortfall (if any)
Spending gap not covered by assets or income
Income is counted only from the age entered for that source — not from retirement day one.
Asset balances are used only after the user-entered access age for each bucket.
Closing assets include modeled growth from the user-entered return and fee assumptions.
The model applies constant return assumptions. Actual investment results will differ.
How to Use It

Build a Bridge Plan in Three Steps

  1. 1

    Set your current age, work reduction age, full work exit age and bridge end age.

  2. 2

    Add employment income, then income sources for pension, Social Security and any other benefits — each with a start age.

  3. 3

    In Mode A (Projection), add asset buckets with balances and access ages. In Mode B (Solver), the calculator estimates required starting capital.

What It Does Not Model

Calculator Limitations to Review

  • Does not calculate personal income taxes or net spendable income.
  • Does not determine withdrawal penalties, account eligibility or benefit rules.
  • Does not calculate Social Security or pension benefit amounts — those are user entries.
  • Does not model sequence-of-returns risk or variable market performance.
  • Does not model healthcare or any other specific expense category.
  • A fully funded bridge projection is not investment, tax, legal, pension or Social Security advice.
When to Use This Calculator

Retirement Bridge Scenarios This Tool Handles

Retiring before Social Security

Model the years before the selected claiming age.

Pension starts after work ends

Bridge the gap between work exit and first pension payment.

Reducing work gradually

Model part-time income before full work exit.

Accounts unlock at different ages

Use each asset from its access age.

Spending changes during the bridge

Add spending phases for healthcare or housing transitions.

Testing accessible-asset depletion

See whether bridge assets last until later income starts.

Avoid False Precision

Common Bridge-Planning Mistakes

These pitfalls can silently distort an otherwise careful bridge projection.

Counting benefits too early

Only income from its entered start age is counted in that year.

Counting restricted accounts

Assets are used only after their user-entered access age.

Ignoring spending inflation

Fixed spending assumptions can understate later bridge withdrawals.

Separating income start dates

Different sources begin at different ages — not all at once.

Ignoring asset depletion

A total portfolio can hide the year accessible bridge funds run out.

Treating gross as net income

The calculator does not estimate income taxes or net spendable income.

Bridge Years Calculator FAQs

What are bridge years in retirement planning?

Bridge years are the years between a reduction in employment income and the point when later retirement income — pension, Social Security, annuity — or additional assets become accessible. The bridge is typically funded by part-time income, cash, taxable investments or other accessible assets.

How does the Bridge Years Calculator model annual cash flow?

The calculator processes each year from the current age to the bridge end age. It applies inflation-adjusted spending, counts each income source only from its entered start age, and uses each asset bucket only from its entered access age. The remaining gap is covered by accessible-asset withdrawals.

What is required bridge capital?

Required bridge capital is the estimated accessible starting balance needed to fund all modeled annual shortfalls through the bridge end age. The calculator uses binary search with a $1 tolerance to find this amount.

Can I model multiple income start dates?

Yes. Pension, Social Security, part-time income, annuity and other sources can each begin at a different age. Each is applied only from its entered start age.

What happens when accessible assets are depleted?

The calculator marks the first uncovered year and shows the remaining annual shortfall not covered by income or accessible assets.

How does inflation affect bridge capital requirements?

Later bridge years may require larger withdrawals when spending rises faster than the income sources available during those years.

Can I model account access ages?

Yes. Each asset bucket has a user-entered access age. The calculator uses that bucket only from that age. Access ages are planning assumptions; the calculator does not determine taxes, penalties or eligibility.

Does a fully funded bridge mean I can retire?

No. The result is an educational cash-flow projection based on entered assumptions. It does not account for taxes, healthcare, market sequences, benefit eligibility or any other personal planning factor.

Financial disclaimer: This calculator is an educational planning tool. It uses simplified assumptions and is not investment, tax, legal, pension or Social Security advice. Review official benefit estimates and consult a qualified professional before making financial decisions.

Last reviewed: July 2026.Review the Coast FIRE calculation methodology →

Methodology and Trust

How This Bridge Cash-Flow Model Works

  • Methodology version: 1.0.0. Last reviewed: July 2026.
  • Results recalculate in the browser as inputs change. No data leaves the device.
  • The solver uses binary search with a $1 tolerance to find required bridge capital.
  • Spending is inflation-adjusted each bridge year from the entered rate.
  • Income is applied only from its entered start age. Assets are used only from their access age.
  • Constant return assumptions are applied within each bucket. Sequence-of-returns risk is not modeled.
  • Access ages are user-entered planning assumptions — not legal, tax or eligibility determinations.
  • This is an educational cash-flow estimate, not investment, tax, legal, pension or Social Security advice.
MethodologyData sourcesCalculator changelogFinancial disclaimer
Run your numbers

Coast FIRE Bridge Years Calculator

Update your ages, spending, income sources and accessible assets. Review each bridge year before relying on any single result.

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