Coast FIRE for Single Parents
Single-parent Coast FIRE can involve more than one income number. Child-related costs and support may begin or end at different times, while your retirement investments follow their own timeline. Model those changes without turning temporary family costs into permanent retirement spending.
Your Single-Parent Coast FIRE Plan
Enter the child or dependent costs you personally expect to cover that are not already included elsewhere in your household spending.
Child Support & Support SourcesConfigure child support, survivor benefits, or recurring family support
ℹ️ Use amounts and timing from your actual situation. The calculator models cash flow changes without estimating legal child support entitlement.
Family Cost Timeline & Expense SharingSet child-cost end age and your personal share of expenses
Age when major childcare, school, or dependent expenses end.
The amount of time a child spends with each parent does not automatically determine how every expense is divided. Enter the share of each cost you actually expect to fund rather than having the calculator infer it from custody arrangements.
Dependent Health CoverageSpecify family health insurance payment responsibilities
ℹ️ Dependents may remain on a parent's health plan up to age 26 under federal rules. Marketplace and Medicaid/CHIP eligibility depend on household circumstances (HealthCare.gov).
Planning AssumptionsShared return, inflation, fee and SWR assumptions
Modeled Real Return: 3.69%/yr
Your Coast FIRE Position
Coast FIRE Target Today
Your portfolio of $150,000 leaves a position of -$455,661 Gap against a target of $605,661.
Current Investments
$150,000
Gap / Surplus Today
-$455,661
Retirement Contribution
$800.00/mo
Modeled Coast Age
Age 55
What Happens When Support Ends?
5-Year Unsupported Family-Cost Period (Ages 45–50)
Child support ends at Age 45, but major child expenses continue until Age 50. Your net monthly family costs will increase by $600.00/month during this period.
Default keeps your current contribution rate unchanged. Adjust if ending support will change your monthly savings.
Your Single-Parent Coast FIRE Timeline
Tracks current age, support end date, child cost end date, Coast FIRE age, and retirement age.
How Does Your Family Cash Flow Change Over Time?
- Your Child Costs: $1,200/mo
- Support Income: +$600.00/mo
- Net Family Cost: $600.00/mo
- Retirement Contrib: $800.00/mo
- Your Child Costs: $1,200/mo
- Support Income: $0/mo
- Net Family Cost: $1,200/mo
- Retirement Contrib: $800.00/mo
- Your Child Costs: $0/mo
- Support Income: $0/mo
- Net Family Cost: $0/mo
- Retirement Contrib: $800.00/mo
What Happens When a Major Child Expense Ends?
At Age 50, your child expenses of $1,200/month drop to $0. Select how much of that freed cash goes to retirement:
Child Support and Federal Taxes
Under current federal tax rules (IRS), child support received is not taxable income to the recipient, and child support paid is not tax-deductible by the payer.
Social Security Survivor Benefits
Eligible children and surviving family members may receive SSA survivor benefits. Enter the actual benefit amount and end date from SSA rather than estimating eligibility here. SSA Survivor Info →
Why Single-Parent Coast FIRE Is Mostly a Timing Problem
A single-parent household can have several timelines at once: retirement investing, childcare or dependent costs, child support, shared expenses, education support, and retirement. Some family expenses may end years before retirement, while others may continue after support payments stop. The Coast FIRE calculation should distinguish temporary household cash flow from permanent retirement spending rather than combining everything into one annual expense number.
Child Support Does Not Reduce the Coast FIRE Target Forever
Child support can help fund current family expenses while it is received. If support ends before retirement, it should not be treated as permanent retirement income. Likewise, child-related expenses that end before retirement should not automatically become permanent retirement spending. The important calculation is the overlap between support, family costs, retirement contributions, and retirement date.
One Retirement Portfolio, Separate Family Goals
Keep retirement investments separate from 529 assets, education savings, emergency cash, or other funds dedicated to family goals unless the scenario explicitly uses those assets for retirement. A single parent can have substantial money saved for a child while still having a different Coast FIRE investment balance. This avoids counting the same dollars toward two goals.
Saving Separately for Education?
Keep education savings separate from retirement investments by default. If college funding is a major part of your plan, use the With Kids calculator to model 529 savings and education expenses. Open Kids Calculator →
What If Your Only Employment Income Stops?
A single-income household has a different short-term runway if employment stops. Use the Job Loss calculator to model cash runway, severance, and reemployment timing. Open Job Loss Calculator →
Questions About Single-Parent Coast FIRE
Answers to common questions about child support, expense splits, support gaps, 529 separation, and survivor benefits.
Should child support count as income in my Coast FIRE plan?▼
It can be included as household cash flow for the period you expect to receive it. If it ends before retirement, do not treat it as permanent retirement income or subtract it indefinitely from retirement spending.
What if child support ends before my child's major expenses end?▼
Model the periods separately. The calculator should show the years when family costs continue without that support and allow retirement contributions to change during that gap.
Does being a single parent automatically increase my Coast FIRE target?▼
No. The Coast target depends on retirement spending, retirement timing and planning assumptions. Single-parent family costs can affect current cash flow without automatically becoming permanent retirement expenses.
How should I model expenses that are shared with my child's other parent?▼
Enter the portion you actually expect to pay. Do not infer expense responsibility from custody percentage because different costs may be divided in different ways.
What if I am still supporting my child after child support ends?▼
Give the expected support its own end date. If those costs occur before retirement they primarily affect cash flow; if they overlap retirement, model only the overlapping years as additional portfolio-funded spending.
Should money saved for my child's education count toward Coast FIRE?▼
Keep money dedicated to education separate from retirement investments by default. That prevents the same assets from being counted toward both a child's education and the retirement portfolio.
How should a widowed single parent handle Social Security survivor benefits?▼
Enter an actual SSA survivor benefit as temporary household support with its applicable end date. Eligibility and benefit duration depend on SSA rules, so the calculator should not invent a survivor-benefit estimate.
Verified Sources & Methodology
IRC Sec. 72(t)(2)(A)(v) Early Distribution Exception
2026 Federal Brackets & Standard Deductions
Summary Plan Description (SPD) Distribution Rules
Retirement Claiming Ages (62–70)