Coast FIRE Calculator for Couples

Add your savings together. Divide by your combined expenses. A couple spending $80K/year needs $2M at retirement (4% rule). If you have $200K saved today with 25 years until retirement, you need $519K to Coast FIRE—your investments will grow to $2M on their own. Use "Combined" mode for shared finances, or "Side-by-Side" to see individual contributions.

Combine for accuracy. Even with separate bank accounts, your expenses are shared. Calculating separately double-counts housing, utilities, and insurance. You'd both save for 100% of rent when you only need 50% each. Separate accounts ≠ separate financial goals.

That's completely normal. Our calculator shows contribution percentages so you can see the breakdown. The lower-saving partner's income still reduces future savings burden—every dollar they earn is a dollar the higher-saver doesn't need to contribute. Use "Side-by-Side" view to track individual progress toward the shared goal.

Use the earlier target date. If Partner A wants to retire at 55 and Partner B at 60, calculate for 55. When Partner A coasts, Partner B has options: keep working (boost the nest egg), switch to part-time work, or coast alongside Partner A. The earlier date ensures you're both prepared, even if plans change.

Yes, but in a separate step. A pension paying $20K/year reduces your required nest egg by $500K (using the 4% rule). That's huge. Use our With Pension Calculator to factor in Social Security estimates, employer pensions, and government benefits.

It depends on your spending, not your income. A couple spending $60K/year needs $1.5M at retirement (4% rule). At 30 with $100K saved and 7% real returns, you'd need $197K to Coast FIRE — your money grows to $1.5M over 30 years on its own. Spending $80K? Target jumps to $2M, needing $263K today. Use the calculator above with your actual numbers — averages don't tell your story.

Use the younger partner's retirement timeline for compounding calculations — it gives you more growth runway. If Partner A is 40 and Partner B is 32, calculate time-to-coast based on Partner B reaching retirement age. The older partner benefits from the longer compounding window. For healthcare: the older partner hits Medicare at 65; the younger one may need private insurance longer. Budget $500-800/month per person for pre-Medicare health coverage.

Social Security reduces how much you need saved. A couple receiving $40K/year combined from Social Security at 67 needs $1M less in their portfolio (4% rule). Spousal benefits matter: a non-working spouse can claim up to 50% of the working spouse's benefit. Example: if the working spouse gets $2,500/month, the non-working spouse gets $1,250/month — that's $45K/year combined, offsetting $1.1M in savings. Use our With Pension Calculator to model the exact impact on your Coast FIRE number.

Married Filing Jointly (MFJ) gives couples a significant tax advantage. The standard deduction nearly doubles ($30,000 vs $15,000 in 2026), and tax bracket thresholds are wider. A couple earning $180K combined saves roughly $8,000/year vs. filing as two singles. Invested at 7% real returns over 20 years, that's $328,000 extra — enough to move your Coast FIRE date forward by 2-3 years. Exception: if one partner has high medical deductions or income-driven student loan payments, run both MFJ and MFS to compare.

When one partner leaves full-time work to coast, you lose their employer health insurance. Three options: (1) COBRA — continues your employer plan for 18 months but costs $1,500-2,000/month for a couple. (2) ACA Marketplace — the coasting partner's low income qualifies your household for subsidies, potentially cutting premiums to $200-400/month. (3) The working partner's employer plan — add the coasting spouse, typically $300-600/month. The ACA route is usually cheapest and pairs perfectly with a staggered Coast FIRE approach.